Lexington Weather
Lexington, Massachusetts, USA
- Partly cloudy
-
87.3°F / 30.7°C
-
76.6°F
- 98.8°F
-
71%
- Calm, 10-min avg: Calm, gust: None
- 10 miles
- 0.00 in
Current Conditions [‒] Current Conditions [+]
87.3°F
30.7°C
Feels like 98.8°F
Hot
Partly cloudy
This Afternoon: Hi 89 °F
Tonight: Lo 73 °F
Dew Point:
76.6°F
Humidity:
71%
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Wednesday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 0 mph
Alerts / Advisories [‒] Alerts / Advisories [+]
Forecast [‒] Forecast [+]
NWS Weather Forecast -
This Afternoon,
Tonight,
&
Friday
through
Wednesday Night
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Thu Aug 6, 2026 2:19pm EDT
Overview:
- Heat and humidity continues into Friday, with only a few afternoon showers or thunderstorms.
- Cool front brings scattered storms Saturday. Less humidity levels and dry weather Sunday but daily shower/storm chances resume early to midweek.
This Afternoon:
Chance Showers And T-Storms
Hi 89 °F
A chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 89. Heat index values as high as 99. Southwest wind around 7 mph. Chance of precipitation is 30%.
Tonight:
Mostly Clear
Lo 73 °F
Mostly clear, with a low around 73. Heat index values as high as 97. Southwest wind around 6 mph.
Friday:
Sunny then Slight Chance Showers And T-Storms
Hi 92 °F
A slight chance of showers and thunderstorms after 5pm. Sunny, with a high near 92. Heat index values as high as 98. West wind around 6 mph. Chance of precipitation is 20%.
Friday Night:
Slight Chance Showers And T-Storms then Partly Cloudy
Lo 72 °F
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 72. Heat index values as high as 96. Southwest wind around 5 mph. Chance of precipitation is 20%.
Saturday:
Partly Sunny then Chance Showers And T-Storms
Hi 89 °F
A slight chance of rain showers between 1pm and 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then showers and thunderstorms likely. Partly sunny, with a high near 89. Southwest wind 3 to 9 mph. Chance of precipitation is 60%.
Saturday Night:
Chance Showers And T-Storms then Partly Cloudy
Lo 71 °F
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 71. Southwest wind 5 to 8 mph. Chance of precipitation is 50%.
Sunday:
Sunny
Hi 88 °F
Sunny, with a high near 88. West wind 5 to 10 mph, with gusts as high as 21 mph.
Sunday Night:
Clear
Lo 66 °F
Clear, with a low around 66. West wind 3 to 9 mph.
Monday:
Sunny
Hi 88 °F
Sunny, with a high near 88. West wind 3 to 9 mph.
Monday Night:
Slight Chance Rain Showers
Lo 69 °F
A slight chance of rain showers after 9pm. Partly cloudy, with a low around 69. Southwest wind 5 to 8 mph.
Tuesday:
Chance Rain Showers
Hi 87 °F
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 87. West wind 5 to 9 mph. Chance of precipitation is 50%.
Tuesday Night:
Chance Showers And T-Storms
Lo 67 °F
A chance of showers and thunderstorms before 4am. Mostly cloudy, with a low around 67. West wind 3 to 7 mph. Chance of precipitation is 40%.
Wednesday:
Chance Rain Showers
Hi 84 °F
A chance of rain showers after 8am. Mostly sunny, with a high near 84. West wind around 7 mph. Chance of precipitation is 30%.
Wednesday Night:
Slight Chance Rain Showers then Partly Cloudy
Lo 64 °F
A slight chance of rain showers before 8pm. Partly cloudy, with a low around 64. West wind around 6 mph.
NWS Hourly Forecast -
Today 3pm through Sat 2am
Issued by:
National Weather Service Boston / Norton, MA
Updated Thu Aug 6, 2026 2:19pm EDT
3:00pm
Dew Pt 76°F
Heat Index: 99°F
SW 7 mphPrecip: 20%
4:00pm
Dew Pt 76°F
Heat Index: 99°F
SW 7 mphPrecip: 25%
5:00pm
Dew Pt 75°F
Heat Index: 97°F
SW 7 mphPrecip: 18%
6:00pm
Dew Pt 76°F
Heat Index: 97°F
SW 6 mphPrecip: 11%
7:00pm
Dew Pt 76°F
Heat Index: 94°F
SW 6 mphPrecip: 11%
8:00pm
Dew Pt 75°F
Heat Index: 86°F
SW 5 mphPrecip: 5%
9:00pm
Dew Pt 75°F
SW 5 mphPrecip: 5%
10:00pm
Dew Pt 75°F
SW 5 mphPrecip: 5%
11:00pm
Dew Pt 75°F
SW 5 mphPrecip: 5%
12:00am
Dew Pt 75°F
SW 5 mphPrecip: 3%
1:00am
Dew Pt 74°F
SW 5 mphPrecip: 3%
2:00am
Dew Pt 74°F
SW 3 mphPrecip: 2%
3:00am
Dew Pt 73°F
SW 3 mphPrecip: 2%
4:00am
Dew Pt 73°F
W 3 mphPrecip: 2%
5:00am
Dew Pt 73°F
W 3 mphPrecip: 3%
6:00am
Dew Pt 73°F
W 3 mphPrecip: 3%
7:00am
Dew Pt 73°F
W 3 mphPrecip: 3%
8:00am
Dew Pt 73°F
W 5 mphPrecip: 3%
9:00am
Dew Pt 73°F
Heat Index: 84°F
W 5 mphPrecip: 3%
10:00am
Dew Pt 73°F
Heat Index: 90°F
W 5 mphPrecip: 3%
11:00am
Dew Pt 72°F
Heat Index: 94°F
W 5 mphPrecip: 3%
12:00pm
Dew Pt 71°F
Heat Index: 95°F
W 5 mphPrecip: 3%
1:00pm
Dew Pt 71°F
Heat Index: 97°F
W 5 mphPrecip: 4%
2:00pm
Dew Pt 71°F
Heat Index: 98°F
W 6 mphPrecip: 11%
3:00pm
Dew Pt 71°F
Heat Index: 98°F
W 6 mphPrecip: 12%
4:00pm
Dew Pt 71°F
Heat Index: 98°F
W 6 mphPrecip: 14%
5:00pm
Dew Pt 71°F
Heat Index: 96°F
SW 6 mphPrecip: 16%
6:00pm
Dew Pt 72°F
Heat Index: 96°F
SW 5 mphPrecip: 16%
7:00pm
Dew Pt 72°F
Heat Index: 93°F
SW 5 mphPrecip: 14%
8:00pm
Dew Pt 72°F
Heat Index: 87°F
SW 5 mphPrecip: 13%
9:00pm
Dew Pt 72°F
Heat Index: 84°F
SW 3 mphPrecip: 11%
10:00pm
Dew Pt 72°F
SW 5 mphPrecip: 7%
11:00pm
Dew Pt 72°F
SW 5 mphPrecip: 8%
12:00am
Dew Pt 72°F
SW 3 mphPrecip: 11%
1:00am
Dew Pt 72°F
SW 3 mphPrecip: 13%
2:00am
Dew Pt 72°F
SW 3 mphPrecip: 13%
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 061907
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
307 PM EDT Thu Aug 6 2026
.WHAT HAS CHANGED...
No significant changes. Although it remains very warm into the
weekend, the level of heat does begin to drop off so the current
thought is to not extend the Heat Advisory beyond Friday.
&&
.KEY MESSAGES...
- Heat and humidity continues into Friday, with only a few
afternoon showers or thunderstorms.
- Cool front brings scattered storms Saturday. Less humidity
levels and dry weather Sunday but daily shower/storm chances
resume early to midweek.
&&
.DISCUSSION...
KEY MESSAGE 1...Heat and humidity continues into Friday, with
only a few afternoon showers or thunderstorms.
Latest model guidance does not show much need for changes to the
forecast for the remainder of today and tomorrow. As typical
with convection, even hi-res models struggle with timing,
placement and coverage. We have already seen a few showers
develop across areas further east (ie: Boston area to the North
Shore) than was previously anticipated. With the SW flow, the
south coast sea breeze is moving northward and thus expect
shower chances to remain north of this boundary as the
afternoon/evening goes on. We do have a decent amount of Mixed
Layer CAPE (MLCAPE) on the order of 2000 J/kg, but mid level
lapse rates are very meager, so not expecting any substantial
thunderstorm development. Convection will wane with sunset. With
the very moist airmass, we will again see the development of
stratus and fog later tonight, especially across the southern
half of SNE. Like today, those clouds and fog will "burn" off
tomorrow morning. No real airmass change, though if anything, it
will be a degree or two warmer. 925mb temperatures today were in
the 23-24C range, and that rises to 25-26C on Friday. When
combined with dewpoints in the 70s, heat index (feels like)
temperatures will top out well into the 90s, if not low 100s.
Thus the Heat Advisory will continue. There will be a warm layer
aloft (above roughly 850mb/5000ft) that will act as a lid to
keep convection at bay. Though an isolated afternoon shower or
thunderstorm is possible, they should be more the exception and
likely contained to far western areas where the hilly terrain
will help focus convective development. Guidance is a little
unclear for Friday night, but we might see some late evening
convection move in from the west. Just kept with NBM PoPs
showing roughly 20-40% PoPs overnight for the CT River Valley
and points east.
KEY MESSAGE2...Cool front brings scattered storms Saturday.
Less humidity levels and dry weather Sunday but daily
shower/storm chances resume early to midweek.
All in all a general sameness to the weather pattern day-by-day
through Saturday, with warm temperatures in the 80s with very high
humidity levels, to go along with daily shower and thunderstorm
chances following the diurnal cycle. Saturday offers a better shot a
a bit more thunderstorm coverage with a cool front, although the
risk for organized severe weather looks minimal, kept in check by
weak windfields aloft leading to deep layer shear magnitudes in the
25-30 kt range and generally slower SWly storm motions. This front
will offer somewhat lower humidity levels, basically knocking
dewpoints down from current "oppressive" values in the low to mid
70s to "humid" mid/upper 60s levels. Storms would be capable of
lightning and heavy rain, with the strongest of those storms capable
of frequent lightning and localized downdrafts capable of sporadic
wind damage, but those should be a very small subset of the storms.
Weak subsidence and marginally lower dewpoints could limit or
mitigate shower/storm chances on Sunday, although still with the
usual summer warmth. The risk for daily shower and thunderstorm
chances also increases early to mid next week as the Northeast
states become more influenced by a somewhat stronger belt of
westerly midlevel flow. With stronger winds aloft with that comes a
somewhat better chance for storms becoming strong/severe but the
timing is still uncertain.
Stayed fairly close to NBM forecast values during this period.
&&
.AVIATION /18Z THURSDAY THROUGH TUESDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF update. Moderate Confidence.
No big changes to the forecast. Dealing with mainly VFR,
although stratus is resulting in some IFR for the Islands. Sea
breezes have developed along both coasts, but the east coast sea
breeze is pinned pretty close to the coast. Isolated showers dot
the area, and a TSRA can't be ruled out later this afternoon.
Though the better chances are across the western areas. Placed
some PROB30s in TAFs where the better chances exists. Overnight
expect a similar situation to unfold as last night. Basically
low clouds/stratus and some fog to produce IFR conditions,
especially across the southern half of the area. Could also have
some fog in the CT River Valley. Those clouds/fog should
dissipate fairly quickly Friday morning, except places like ACK
and parts of the Cape where it will take a little longer. Could
be a few SHRA/-TSRA across the interior Friday afternoon.
Looking forward to Friday night, additional low clouds/fog
should develop near the south coastal areas. Could also see
additional TSRA activity lingering well into late evening across
western areas. Later forecasts will fine tune those details.
KBOS Terminal...Moderate confidence. Sea breeze expected to push
out a little earlier than the typical 23-00z time. Expect BOS to
be on the northern edge of stratus that develops late tonight
across southern areas.
KBDL Terminal...Moderate confidence. Monitoring TSRA across
eastern NY as to whether they will make it to BDL later this
afternoon. Some uncertainty as to the coverage of any stratus
and fog late tonight.
Outlook /Friday Night through Tuesday/...
Saturday: VFR. Breezy. Chance SHRA, chance TSRA.
Saturday Night through Sunday: VFR. Breezy.
Sunday Night: VFR.
Monday: VFR. Breezy.
Monday Night: VFR. Slight chance SHRA.
Tuesday: VFR. 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.
Through Friday... High Confidence.
No significant changes to the forecast. Overall weather pattern
shows a large area of high pressure off the east coast. This
will continue to produce a SW flow across the entire region into
the weekend.
Outlook /Friday Night through Tuesday/...
Saturday: Winds less than 25 kt. Areas of seas approaching
5 ft.
Saturday Night: Winds less than 25 kt. Seas up to 5 ft. Slight
chance of rain showers.
Sunday through Sunday Night: Winds less than 25 kt. Areas of
seas approaching 5 ft.
Monday: Winds less than 25 kt.
Monday Night: Winds less than 25 kt. Slight chance of rain
showers.
Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Slight chance of rain showers.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Heat Advisory until 8 PM EDT Friday for CTZ002>004.
MA...Heat Advisory until 8 PM EDT Friday for MAZ003>007-010>021-026.
RI...Heat Advisory until 8 PM EDT Friday for RIZ001>007.
MARINE...None.
&&
$$
DISCUSSION...Loconto/Nash
AVIATION...Loconto/Nash
MARINE...Loconto/Nash
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: 4 Medium
Current (Estimated): 2 Low
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
Wednesday:
1.46 in
August:
19.12 in
2026
Daily Extremes [‒] Daily Extremes [+]
3:25pm
88.0°F
High today:
3:49am
72.0°F
Low today:
3:38pm
85.5°F
High Wednesday:
6:26am
64.6°F
Low Wednesday:
12:52pm
79.0°F
High dew pt today:
1:20pm
71.2°F
High dew pt Wednesday:
2:48pm
100.9°F
High heat index today:
3:38pm
89.4°F
High heat index Wednesday:
11:22am
5 mph
Wind gust today:
1:04pm
9 mph
Wind gust Wednesday:
Sun / Moon [‒] Sun / Moon [+]
First Light:
5:12am
Sunrise:
5:43am
Sunset:
7:59pm
Twilight ends:
8:30pm
Daylight length:
14 hours 16 minutes
Phase:
Waning Crescent (42%)
Moon set:
2:34pm
Moon rise:
11:42pm
Social Media - Mastodon [‒] Social Media - Mastodon [+]
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