Lexington Weather
Lexington, Massachusetts, USA
- Clear
-
93.0°F / 33.9°C
-
69.8°F
- 99°F
-
47%
- Calm, 10-min avg: Calm, gust: 1 mph
-
- 10 miles
- 0.00 in
Current Conditions [‒] Current Conditions [+]
93.0°F
33.9°C
Feels like 99°F
Hot
Clear
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Thursday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 1 mph
Alerts / Advisories [‒] Alerts / Advisories [+]
Forecast [‒] Forecast [+]
NWS Weather Forecast -
Today,
Tonight,
&
Independence Day
through
Thursday Night
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Fri Jul 3, 2026 3:11am EDT
Overview:
- Dangerous heatwave continues today and Independence Day. Heat indices of 100-110 degrees today & 95-100+ on Independence Day.
- Isolated severe weather potential late today/tonight. Greatest risk interior MA/CT. Main risk will be isolated pockets of damaging straight line wind gusts.
- Low risk of severe weather and a few t-storms on Independence Day, but greatest risk for more widespread activity right now looks to be to our southwest. - Relief from the heat with cooler and more seasonable temperatures returning for the first half of next week. Also...the potential for some much need rain may occur in the late Sun-Tue time frame but that remains to be seen.
Today:
Sunny
Hi 100 °F
Sunny, with a high near 100. Heat index values as high as 106. West wind 6 to 13 mph, with gusts as high as 24 mph.
Tonight:
Scattered Showers And T-Storms
Lo 75 °F
Scattered showers and thunderstorms after 11pm. Partly cloudy, with a low around 75. Heat index values as high as 102. West wind 3 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Independence Day:
Scattered Showers And T-Storms
Hi 96 °F
Scattered showers and thunderstorms. Mostly sunny, with a high near 96. Heat index values as high as 97. West wind 5 to 13 mph. Chance of precipitation is 30%.
Saturday Night:
Scattered Showers And T-Storms then Partly Cloudy
Lo 63 °F
Scattered showers and thunderstorms before 9pm. Partly cloudy, with a low around 63. Northwest wind 3 to 8 mph. Chance of precipitation is 30%.
Sunday:
Sunny
Hi 85 °F
Sunny, with a high near 85. Northeast wind 2 to 9 mph.
Sunday Night:
Slight Chance Rain Showers
Lo 62 °F
A slight chance of rain showers between 9pm and 2am. Mostly cloudy, with a low around 62. Southeast wind 2 to 9 mph. Chance of precipitation is 20%.
Monday:
Partly Sunny then Chance Rain Showers
Hi 80 °F
A chance of rain showers after 2pm. Partly sunny, with a high near 80. Southeast wind 2 to 8 mph. Chance of precipitation is 30%.
Monday Night:
Chance Showers And T-Storms
Lo 62 °F
A chance of rain showers before 8pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 62. East wind 3 to 7 mph. Chance of precipitation is 50%.
Tuesday:
Chance Showers And T-Storms
Hi 77 °F
A chance of showers and thunderstorms. Partly sunny, with a high near 77. East wind 5 to 10 mph. Chance of precipitation is 50%.
Tuesday Night:
Chance Rain Showers
Lo 61 °F
A chance of rain showers. Mostly cloudy, with a low around 61. Northeast wind 3 to 8 mph. Chance of precipitation is 30%.
Wednesday:
Slight Chance Rain Showers
Hi 84 °F
A slight chance of rain showers. Mostly sunny, with a high near 84. Northeast wind 3 to 7 mph.
Wednesday Night:
Partly Cloudy
Lo 64 °F
Partly cloudy, with a low around 64. Southwest wind around 6 mph.
Thursday:
Mostly Sunny
Hi 92 °F
Mostly sunny, with a high near 92. Southwest wind 3 to 7 mph.
Thursday Night:
Partly Cloudy
Lo 68 °F
Partly cloudy, with a low around 68. Southwest wind around 7 mph.
NWS Hourly Forecast -
Today 12pm through Sat 11pm
Issued by:
National Weather Service Boston / Norton, MA
Updated Fri Jul 3, 2026 3:11am EDT
12:00pm
Dew Pt 69°F
Heat Index: 102°F
W 12 mphPrecip: 1%
1:00pm
Dew Pt 68°F
Heat Index: 104°F
W 13 mphPrecip: 2%
2:00pm
Dew Pt 68°F
Heat Index: 105°F
W 13 mphPrecip: 3%
3:00pm
Dew Pt 68°F
Heat Index: 106°F
W 13 mphPrecip: 3%
4:00pm
Dew Pt 68°F
Heat Index: 106°F
W 13 mphPrecip: 2%
5:00pm
Dew Pt 68°F
Heat Index: 105°F
W 13 mphPrecip: 2%
6:00pm
Dew Pt 68°F
Heat Index: 102°F
W 10 mphPrecip: 8%
7:00pm
Dew Pt 68°F
Heat Index: 99°F
W 9 mphPrecip: 13%
8:00pm
Dew Pt 69°F
Heat Index: 96°F
W 7 mphPrecip: 19%
9:00pm
Dew Pt 69°F
Heat Index: 92°F
W 7 mphPrecip: 24%
10:00pm
Dew Pt 69°F
Heat Index: 90°F
W 6 mphPrecip: 29%
11:00pm
Dew Pt 70°F
Heat Index: 88°F
W 6 mphPrecip: 29%
12:00am
Dew Pt 69°F
Heat Index: 87°F
W 6 mphPrecip: 29%
1:00am
Dew Pt 69°F
Heat Index: 84°F
W 6 mphPrecip: 26%
2:00am
Dew Pt 68°F
W 6 mphPrecip: 24%
3:00am
Dew Pt 68°F
W 5 mphPrecip: 21%
4:00am
Dew Pt 68°F
W 5 mphPrecip: 19%
5:00am
Dew Pt 68°F
W 3 mphPrecip: 16%
6:00am
Dew Pt 68°F
W 5 mphPrecip: 17%
7:00am
Dew Pt 68°F
W 6 mphPrecip: 17%
8:00am
Dew Pt 69°F
Heat Index: 85°F
NW 7 mphPrecip: 18%
9:00am
Dew Pt 68°F
Heat Index: 88°F
NW 8 mphPrecip: 18%
10:00am
Dew Pt 68°F
Heat Index: 91°F
NW 9 mphPrecip: 17%
11:00am
Dew Pt 67°F
Heat Index: 93°F
NW 10 mphPrecip: 17%
12:00pm
Dew Pt 67°F
Heat Index: 96°F
NW 10 mphPrecip: 21%
1:00pm
Dew Pt 67°F
Heat Index: 97°F
W 12 mphPrecip: 25%
2:00pm
Dew Pt 67°F
Heat Index: 97°F
W 13 mphPrecip: 28%
3:00pm
Dew Pt 66°F
Heat Index: 96°F
W 12 mphPrecip: 29%
4:00pm
Dew Pt 67°F
Heat Index: 96°F
NW 10 mphPrecip: 30%
5:00pm
Dew Pt 67°F
Heat Index: 94°F
NW 9 mphPrecip: 30%
6:00pm
Dew Pt 67°F
Heat Index: 91°F
NW 8 mphPrecip: 29%
7:00pm
Dew Pt 66°F
Heat Index: 87°F
NW 7 mphPrecip: 27%
8:00pm
Dew Pt 65°F
Heat Index: 83°F
NW 6 mphPrecip: 26%
9:00pm
Dew Pt 65°F
NW 6 mphPrecip: 23%
10:00pm
Dew Pt 64°F
NW 7 mphPrecip: 20%
11:00pm
Dew Pt 63°F
NW 7 mphPrecip: 17%
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 031131
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
731 AM EDT Fri Jul 3 2026
.WHAT HAS CHANGED...
No significant changes to the forecast.
&&
.KEY MESSAGES...
- Dangerous heatwave continues today and Independence Day. Heat
indices of 100-110 degrees today & 95-100+ on Independence Day.
- Isolated severe weather potential late today/tonight. Greatest
risk interior MA/CT. Main risk will be isolated pockets of
damaging straight line wind gusts.
- Low risk of severe weather and a few t-storms on Independence
Day, but greatest risk for more widespread activity right now
looks to be to our southwest.
- Relief from the heat with cooler and more seasonable
temperatures returning for the first half of next week.
Also...the potential for some much need rain may occur in the
late Sun-Tue time frame but that remains to be seen.
&&
.DISCUSSION...
KEY MESSAGE 1...Dangerous heatwave continues today and Independence
Day. Heat indices of 100-110 degrees today & 95-100+ on Independence
Day.
Near record high temperatures are once again on tap for the region
today. An anomalous airmass remains in place across southern New
England today with 925T on the order of +27C to +29C. This
coupled with a very warm start, mostly sunny skies and westerly
flow will result in temperatures soaring today. High
temperatures should top out in the 97 to 103 degree range and
once again challenge records. This combined with high dewpoints
will result in dangerous heat indices of 100 to 110 degrees.
Even across the Cape highs should reach into the 90s with heat
indices of 95 to 105 degrees given westerly flow.
There will be little relief tonight as low temperatures only drop
into the 72-77 degree range and probably only the upper 70s to near
80 in the urban heat island of Boston.
Independence Day will still feature dangerous heat and humidity.
Height falls and somewhat lower 925T will likely prevent triple
digit heat on the 4th. Nonetheless...we still expect highs in the 93
to 99 degree range in most location. This will bring heat indices
into the 95-100+ degree range and heat headlines remain in effect.
KEY MESSAGE 2...Isolated severe weather potential late today/tonight.
Greatest risk interior MA/CT. Main risk will be isolated pockets of
damaging straight line wind gusts.
The other concern will be the convective potential mainly late
today/tonight. This portion of the forecast remains tricky given
lack of large scale forcing but impressive instability.
We can not rule out a late afternoon isolated t-storm or two...But
high resolution CAMs indicated the greatest risk may come this
evening into the overnight hours. They tend to want to develop a few
thunderstorms to our west and north. Given ample instability
persisting well into tonight coupled with 0 to 6 KM shear of 30 to
40 knots...this activity will be capable of surviving into our region.
The greatest risk for this activity appears to be across interior MA
and CT where forcing is a bit more prevalent. This is also indicated
by the NADOCAST and CSU machine learning guidance. This will again
be more of a mesoscale/nowcast type of forecast...But the potential
for isolated severe weather exists again tonight. Low risk this
potential could end up a bit more widespread if a complex of storms
were to organize...which always has to be a concern in this type of
environment. But again the lack of overall synoptic scale forcing
will be a limiting factor.
KEY MESSAGE 3...Low risk of severe weather and a few t-storms on
Independence Day, but greatest risk for more widespread
activity right now looks to be to our southwest.
There will a low risk for severe weather on Independence Day as
a cold front works south across the region. At this time...most
of the CAMs and machine learning guidance indicate that the
greatest risk for more widespread thunderstorms and severe
weather will be to our southwest. This is where the best
instability will reside along with better forcing/shortwave
energy. In our region...winds shifting to the NW early in the
day may limit convergence and forcing for more widespread convection.
Nonetheless...given temperatures soaring well into the 90s
coupled with height falls there will be the risk for a few
thunderstorms and a low risk severe weather.
KEY MESSAGE 4...Relief from the heat with cooler and more seasonable
temperatures returning for the first half of next week. Also...the
potential for some much need rain may occur in the late Sun-Tue time
frame but that remains to be seen.
Long range ensemble guidance is in good agreement in the upper
level ridge breaking down and a tendency towards lower heights
next week. This will bring an end to the extreme heat, with readings
more in line with typical summer. A wave of low pressure will also
be approaching from the west. This may bring a period of much needed
over running rain to parts of the region sometime in the Sun night
to Tue time frame. Confidence in these setups is low this time of
year given mesoscale convective factors and limited baroclinicity.
Nonetheless...a period of two of much needed rainfall is possible
for the start of the next work week.
&&
.AVIATION /12Z FRIDAY THROUGH TUESDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
12z TAF Update...
Today through Independence Day...High confidence.
VFR conditions will dominate today through Independence Day. Low
chance for fog/stratus formation across the Islands,
particularly ACK, but confidence too low to include in the TAF.
Otherwise...isolated thunderstorms will be possible mainly
tonight and perhaps again on Independence Day. Best chance for a
late evening thunderstorm today will be across western
terminals, so introduced PROB30 TSRA at BDL between 01 and 05Z
tonight. Shower and storm activity should decrease as any sort
of storms move eastward. Later shifts should continue to
monitor.
Westerly winds may gust to 20+ knots later this morning and
afternoon with a few gusts near 25 knots possible. WInds shift to
the NW on Independence Day with some 20 knot gusts.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...Moderate confidence in TAF, uncertainty in
thunderstorm potential and timing
Outlook /Saturday Night through Tuesday/...
Saturday Night: VFR. Isolated SHRA, isolated TSRA.
Sunday: VFR. Isolated SHRA.
Sunday Night: VFR. Chance SHRA.
Monday: Mainly VFR, with local MVFR possible. Chance SHRA,
slight chance TSRA.
Monday Night: Mainly VFR, with areas MVFR possible. Chance
SHRA, chance TSRA.
Tuesday: Mainly VFR, with areas MVFR possible. Breezy. Chance
SHRA, slight chance TSRA.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Today through Independence Day...High confidence.
Winds/seas should remain below small craft advisory thresholds today
through Independence Day. However...some 20+ knot wind gusts near
shore later this morning and afternoon will result in some chop in
some near shore sounds and Bays.
Outlook /Saturday Night through Tuesday/...
Saturday Night: Winds less than 25 kt. Scattered rain showers,
isolated thunderstorms.
Sunday: Winds less than 25 kt. Isolated rain showers.
Sunday Night: Winds less than 25 kt. Chance of rain showers.
Monday: Winds less than 25 kt. Chance of rain showers, slight
chance of thunderstorms.
Monday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Chance of rain showers, chance of thunderstorms.
Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Chance of rain showers, slight chance of thunderstorms.
&&
.CLIMATE...
Record High Temperatures:
July 3:
KBOS: 102/1911
KBDL: 102/1966
KPVD: 98/2002
KORH: 96/1911
July 4:
KBOS: 104/1911
KBDL: 99/1911
KPVD: 99/1919
KORH: 102/1911
Record High Minimum Temperatures:
July 3:
KBOS: 80/2002
KBDL: 73/2018
KPVD: 78/2002
KORH: 72/2002
July 4:
KBOS: 77/2002
KBDL: 74/2018
KPVD: 77/2002
KORH: 73/2018
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Extreme Heat Warning until 8 PM EDT Saturday for CTZ002>004.
MA...Extreme Heat Warning until 8 PM EDT Saturday for MAZ002>021-
026.
Air Quality Alert from 11 AM this morning to 11 PM EDT this
evening for MAZ020>024.
Heat Advisory until 8 PM EDT Saturday for MAZ022-023.
RI...Extreme Heat Warning until 8 PM EDT Saturday for RIZ001>007.
Air Quality Alert from 11 AM this morning to 11 PM EDT this
evening for RIZ003-004-006>008.
MARINE...None.
&&
$$
DISCUSSION...Frank
AVIATION...Frank/Guest
MARINE...Frank
CLIMATE...FT
Radar [‒] Radar [+]
Radar images courtesy Weather Underground / Intellicast.
Satellite [‒] Satellite [+]
Satellite images courtesy Weather Underground / Intellicast.
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UV Forecast [‒] UV Forecast [+]
UV Index forecast from the Environmental Protection Agency
UV Index forecast high for today: 9 Very High
Current (Estimated): 8 Very High
Precipitation [‒] Precipitation [+]
Note: Rain measured automatically by weather station. Rain totals do not necessarily include melted frozen precipitation.
For more accurate, manually measured rain data, see the Local Precip Data page.
0.00 in
Rain Rate (/hr):
0.00 in
Rain Last 60 min:
0.00 in
Rain Today:
0.00 in
Thursday:
0.00 in
July:
11.82 in
2026
Daily Extremes [‒] Daily Extremes [+]
12:33pm
93.2°F
High today:
6:24am
79.2°F
Low today:
3:11pm
96.3°F
High Thursday:
6:29am
75.0°F
Low Thursday:
12:00am
75.6°F
High dew pt today:
12:00am
76.5°F
High dew pt Thursday:
12:06pm
100.1°F
High heat index today:
1:06pm
109.1°F
High heat index Thursday:
9:49am
4 mph
Wind gust today:
12:17pm
8 mph
Wind gust Thursday:
Sun / Moon [‒] Sun / Moon [+]
First Light:
4:38am
Sunrise:
5:13am
Sunset:
8:26pm
Twilight ends:
9:00pm
Daylight length:
15 hours 13 minutes
Phase:
Waning Gibbous (88%)
Moon set:
8:33am
Moon rise:
10:44pm
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