Lexington Weather
Lexington, Massachusetts, USA
Current Conditions [‒] Current Conditions [+]
68.2°F
20.1°C
Muggy
Overcast
This Afternoon: Hi 72 °F
Tonight: Lo 63 °F
Dew Point: 64.4°F
Humidity: 88%
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Friday: 0.04 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 0 mph
Forecast [‒] Forecast [+]
NWS Weather Forecast -
This Afternoon,
Tonight,
&
Sunday
through
Friday Night
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Sat Aug 22, 2026 3:11pm EDT
Overview:
- Spotty light showers/drizzle tonight but much of the time it will be dry. More humid Sun with a few showers & t-storms possible especially near & west of the CT River Valley where an isolated strong-severe t-storm or two is possible.
- Drier with a return to seasonable temperatures next week. Rain chances return Thursday/Friday.
This Afternoon:
Patchy Drizzle
Hi 72 °F
Patchy drizzle and a slight chance of rain showers before 5pm, then a chance of rain showers and patchy drizzle. Cloudy, with a high near 72. Northeast wind around 9 mph. Chance of precipitation is 30%.
Tonight:
Chance Rain Showers then Patchy Drizzle
Lo 63 °F
A chance of rain showers and patchy drizzle before 8pm, then patchy drizzle and patchy fog and a slight chance of rain showers. Cloudy, with a low around 63. Northeast wind 1 to 8 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Sunday:
Patchy Fog
Hi 75 °F
Patchy drizzle and patchy fog and a slight chance of rain showers before 8am, then a chance of rain showers and patchy drizzle and patchy fog between 8am and 11am, then patchy fog and a slight chance of showers and thunderstorms between 11am and noon, then patchy fog and a chance of showers and thunderstorms. Cloudy, with a high near 75. East wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Sunday Night:
Chance Showers And T-Storms
Lo 62 °F
A chance of showers and thunderstorms before 1am, then patchy fog. Mostly cloudy, with a low around 62. South wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
Monday:
Patchy Fog then Sunny
Hi 82 °F
Patchy fog before 7am. Sunny, with a high near 82. Southwest wind 3 to 9 mph.
Monday Night:
Mostly Clear
Lo 58 °F
Mostly clear, with a low around 58. Southwest wind 5 to 8 mph.
Tuesday:
Sunny
Hi 80 °F
Sunny, with a high near 80. West wind 5 to 10 mph.
Tuesday Night:
Mostly Clear
Lo 60 °F
Mostly clear, with a low around 60. West wind 5 to 8 mph.
Wednesday:
Sunny
Hi 83 °F
Sunny, with a high near 83. West wind around 7 mph.
Wednesday Night:
Mostly Clear
Lo 62 °F
Mostly clear, with a low around 62. West wind around 5 mph.
Thursday:
Mostly Sunny
Hi 84 °F
Mostly sunny, with a high near 84. Southwest wind 2 to 7 mph.
Thursday Night:
Mostly Cloudy then Chance Rain Showers
Lo 64 °F
A chance of rain showers after 1am. Mostly cloudy, with a low around 64. South wind 3 to 7 mph. Chance of precipitation is 30%.
Friday:
Chance Rain Showers
Hi 82 °F
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 82. South wind 3 to 7 mph. Chance of precipitation is 50%.
Friday Night:
Chance Showers And T-Storms then Mostly Cloudy
Lo 64 °F
A chance of showers and thunderstorms before 9pm. Mostly cloudy, with a low around 64. West wind around 6 mph.
NWS Hourly Forecast -
Today 5pm through Mon 4am
Issued by:
National Weather Service Boston / Norton, MA
Updated Sat Aug 22, 2026 3:11pm EDT
5:00pm
Dew Pt 63°F
NE 9 mphPrecip: 30%
6:00pm
Dew Pt 63°F
NE 8 mphPrecip: 28%
7:00pm
Dew Pt 63°F
NE 7 mphPrecip: 25%
8:00pm
Dew Pt 64°F
NE 6 mphPrecip: 23%
9:00pm
Dew Pt 64°F
NE 5 mphPrecip: 21%
10:00pm
Dew Pt 63°F
NE 3 mphPrecip: 19%
11:00pm
Dew Pt 63°F
NE 2 mphPrecip: 17%
12:00am
Dew Pt 63°F
NE 2 mphPrecip: 17%
1:00am
Dew Pt 64°F
NE 1 mphPrecip: 17%
2:00am
Dew Pt 63°F
NE 1 mphPrecip: 17%
Rain: 0.01 in
3:00am
Dew Pt 63°F
NE 1 mphPrecip: 17%
Rain: 0.01 in
4:00am
Dew Pt 64°F
NE 2 mphPrecip: 17%
Rain: 0.01 in
5:00am
Dew Pt 63°F
NE 2 mphPrecip: 17%
Rain: 0.01 in
6:00am
Dew Pt 63°F
NE 2 mphPrecip: 20%
Rain: 0.01 in
7:00am
Dew Pt 64°F
NE 2 mphPrecip: 23%
Rain: 0.01 in
8:00am
Dew Pt 64°F
NE 2 mphPrecip: 26%
Rain: 0.02 in
9:00am
Dew Pt 65°F
NE 3 mphPrecip: 25%
Rain: 0.02 in
10:00am
Dew Pt 65°F
E 3 mphPrecip: 25%
Rain: 0.02 in
11:00am
Dew Pt 66°F
E 3 mphPrecip: 24%
Rain: 0.02 in
12:00pm
Dew Pt 67°F
E 5 mphPrecip: 28%
Rain: 0.02 in
1:00pm
Dew Pt 67°F
E 5 mphPrecip: 42%
Rain: 0.03 in
2:00pm
Dew Pt 67°F
NE 5 mphPrecip: 35%
Rain: 0.01 in
3:00pm
Dew Pt 68°F
E 3 mphPrecip: 43%
Rain: 0.01 in
4:00pm
Dew Pt 68°F
E 3 mphPrecip: 29%
Rain: 0.01 in
5:00pm
Dew Pt 68°F
E 2 mphPrecip: 45%
Rain: 0.01 in
6:00pm
Dew Pt 68°F
E 3 mphPrecip: 35%
Rain: 0.01 in
7:00pm
Dew Pt 68°F
SE 3 mphPrecip: 43%
Rain: 0.01 in
8:00pm
Dew Pt 68°F
S 5 mphPrecip: 31%
9:00pm
Dew Pt 67°F
S 5 mphPrecip: 54%
Rain: 0.01 in
10:00pm
Dew Pt 67°F
S 5 mphPrecip: 32%
11:00pm
Dew Pt 67°F
S 5 mphPrecip: 29%
12:00am
Dew Pt 67°F
S 5 mphPrecip: 26%
1:00am
Dew Pt 66°F
S 5 mphPrecip: 10%
2:00am
Dew Pt 65°F
S 3 mphPrecip: 14%
3:00am
Dew Pt 65°F
S 3 mphPrecip: 2%
4:00am
Dew Pt 64°F
SW 3 mphPrecip: 1%
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 221915
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
315 PM EDT Sat Aug 22 2026
.WHAT HAS CHANGED...
No significant changes to the forecast.
&&
.KEY MESSAGES...
- Spotty light showers/drizzle tonight but much of the time it
will be dry. More humid Sun with a few showers & t-storms
possible especially near & west of the CT River Valley where
an isolated strong-severe t-storm or two is possible.
- Drier with a return to seasonable temperatures next week. Rain
chances return Thursday/Friday.
&&
.DISCUSSION...
KEY MESSAGE 1...Spotty light showers/drizzle tonight but much
of the time it will be dry. More humid Sun with a few showers &
t-storms possible especially near & west of the CT River Valley
where an isolated strong-severe t-storm or two is possible.
Weak offshore low pressure will continue to result in moist/light NE
low level flow into tonight. The result will be rather cloudy skies
tonight with just some spotty light showers/drizzle at times...but
this activity will be quite light with much of the time featuring
dry weather. Some shortwave energy may allow for a few elevated
heavier showers and perhaps a couple t-storms to develop near the
southeast New England coast toward daybreak...mainly near the Cape
and Islands. Some of the earlier model guidance has this activity
further west...but latest indicating that the main risk for this
will be towards the Cape and Islands closer to the shortwave energy.
Overnight low temps will only drop into the lower to middle 60s
given clouds and an abundance of low level moisture. Areas of fog
will be possible too...especially near the coast and in the
Worcester Hills.
Again...we will need to watch for a few showers and isolated t-
storms near the Cape and Islands early Sun morning. Otherwise...the
main concern for a few showers and thunderstorms will be Sun
afternoon/early evening given diurnal instability and shortwave
energy to our west. The bulk of the height falls/forcing will be to
our west. Therefore...greatest risk for a few showers and
thunderstorms will be near and west of the CT River Valley Sun
afternoon/early evening. Instability will be limited by a lot of
cloud cover...but effective shear of 40+ knots will result in the
low risk for an isolated strong to severe severe thunderstorm or
two. Main severe weather risk would be a very localized damaging
wind gusts and brief torrential rainfall. Greatest risk for this
would near and west of the CT River Valley. That being said...much
of the day will feature dry weather...but with a bit more humidity
compared to this afternoon. Highs will be in the 70s to near 80.
KEY MESSAGE 2...Drier with a return to seasonable temperatures
next week. Rain chances return Thursday/Friday.
A post-frontal air mass will usher in drier conditions and warmer
temperatures with westerly winds Monday. As skies gradually clear
from the dreary weekend, dewpoints will begin to drop slightly...
into the upper 50s as opposed to the low to mid 60s we've been
seeing. High pressure begins to slowly build Tuesday into Wednesday,
prolonging the clear skies, drier weather, and warmer temperatures
through the middle of the week. Chances for rain showers return
Thursday and Friday as a low pressure system develops over the Great
Lakes and meanders east through southern Ontario. Some uncertainty
regarding the onset of the showers as there's little consistency in
the global ensembles on the actual placement of the low as it tracks
through Canada.
&&
.AVIATION /19Z SATURDAY THROUGH THURSDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update...
This afternoon through tonight...Moderate confidence.
Mainly MVFR conditions at mid-aftternoon will deteriorate to
generally IFR with localized IFR cigs/vsbys tonight. A few
spotty showers/light drizzle and fog patches are possible at
times too. Perhaps a few heavier showers and isolated t-storms
graze areas towards the Cape and Islands toward daybreak Sun.
Calm/light NE winds.
Sunday and Sunday night...Moderate confidence.
Mainly IFR with localized LIFR conditions Sun morning should
improve to mainly MVFR-VFR levels by Sun afternoon/night. A few
showers and t-storms are possible too with the greatest risk
near and west of the CT River Valley during the afternoon/early
evening. Light ENE gradually becoming light S by Sun night.
KBOS Terminal...Moderate confidence in TAF.
KBDL Terminal...Moderate confidence in TAF.
Outlook /Monday through Thursday/...
Monday: VFR. Breezy.
Monday Night: VFR.
Tuesday through Wednesday: VFR. Breezy.
Wednesday Night: VFR.
Thursday: Mainly VFR, with local IFR possible. Slight chance
SHRA.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Tonight through Sunday night...High confidence.
A wave of low pressure across the waters will be lifting into the
Canadian Maritimes tonight. The pressure gradient though will remain
weak enough to keep winds/seas below small craft advisory thresholds
through Sunday night. Areas of fog will reduce visibilities for
mariners at times especially later tonight into Sun morning.
Outlook /Monday through Thursday/...
Monday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Monday Night through Tuesday: Winds less than 25 kt. Seas
locally approaching 5 ft.
Tuesday Night: Winds less than 25 kt. Areas of seas approaching
5 ft.
Wednesday: Winds less than 25 kt. Seas locally approaching
5 ft.
Wednesday Night through Thursday: Winds less than 25 kt.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...High Risk for Rip Currents until 6 PM EDT this evening for MAZ019-
022.
RI...None.
MARINE...None.
&&
$$
DISCUSSION...Frank/McMinn
AVIATION...Frank/McMinn
MARINE...Frank/McMinn
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: 2 Low
Current (Estimated): 0 None
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:
0.04 in
Friday:
1.77 in
August:
19.43 in
2026
Daily Extremes [‒] Daily Extremes [+]
1:47pm
69.3°F
High today:
6:19am
64.9°F
Low today:
1:58pm
71.6°F
High Friday:
6:31am
63.5°F
Low Friday:
11:39am
66.2°F
High dew pt today:
10:35am
65.5°F
High dew pt Friday:
2:07pm
3 mph
Wind gust today:
11:54am
5 mph
Wind gust Friday:
Alerts / Advisories [‒] Alerts / Advisories [+]
No alerts/warnings active for Southeast Middlesex County.
Sun / Moon [‒] Sun / Moon [+]
First Light:
5:30am
Sunrise:
6:00am
Sunset:
7:36pm
Twilight ends:
8:05pm
Daylight length:
13 hours 36 minutes
Phase:
Waxing Gibbous (75%)
Moon set:
12:08am
Moon rise:
4:36pm
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