Lexington Weather
Lexington, Massachusetts, USA
- Partly cloudy
-
78.1°F / 25.6°C
-
64.9°F
-
64%
- Calm, 10-min avg: Calm, gust: None
- 10 miles
- 0.00 in
National Weather Service Forecast for:
Lexington, MA
Issued by:
National Weather Service Boston / Norton, MA
This Afternoon through Tuesday Night
Point Forecast Updated Wed Aug 26, 2026 3:04pm EDT
Overview:
- Scattered thunderstorms, some of which could be severe late
Thursday, with a few hit and miss thunderstorms possible again
Friday afternoon.
- Mainly dry and seasonable weather follows for this weekend
with comfortable humidity.
- A period or two of unsettled weather may return early next week
with a backdoor cold front in the vicinity of southern New England.
Large spread/high uncertainty on temps dependent on backdoor
cold front/s location.
This Afternoon:
Mostly Sunny
Hi 82 °F
Mostly sunny, with a high near 82. South wind around 5 mph.
Tonight:
Mostly Cloudy
Lo 64 °F
Mostly cloudy, with a low around 64. South wind around 5 mph.
Thursday:
Mostly Sunny
Hi 84 °F
Mostly sunny, with a high near 84. South wind 3 to 12 mph, with gusts as high as 22 mph.
Thursday Night:
Mostly Cloudy then Chance Showers And T-Storms
Lo 68 °F
A chance of rain showers between 2am and 5am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South wind 5 to 10 mph. Chance of precipitation is 30%.
Friday:
Chance Showers And T-Storms then Slight Chance Showers And T-Storms
Hi 84 °F
A chance of showers and thunderstorms before 11am, then a slight chance of showers and thunderstorms between 11am and 1pm, then a chance of showers and thunderstorms between 1pm and 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 84. Southwest wind around 6 mph. Chance of precipitation is 50%.
Friday Night:
Chance Showers And T-Storms then Partly Cloudy
Lo 61 °F
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 61. West wind around 6 mph. Chance of precipitation is 40%.
Saturday:
Sunny
Hi 81 °F
Sunny, with a high near 81. Northwest wind around 5 mph.
Saturday Night:
Mostly Clear
Lo 60 °F
Mostly clear, with a low around 60. Southwest wind around 5 mph.
Sunday:
Mostly Sunny
Hi 84 °F
Mostly sunny, with a high near 84. Southwest wind 3 to 9 mph.
Sunday Night:
Slight Chance Rain Showers
Lo 67 °F
A slight chance of rain showers after 10pm. Partly cloudy, with a low around 67. Southwest wind around 8 mph.
Monday:
Partly Sunny then Slight Chance Showers And T-Storms
Hi 83 °F
A slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 83. Northwest wind around 7 mph.
Monday Night:
Chance Showers And T-Storms
Lo 65 °F
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South wind 2 to 6 mph. Chance of precipitation is 30%.
Tuesday:
Chance Rain Showers
Hi 78 °F
A chance of rain showers. Partly sunny, with a high near 78. Southwest wind 3 to 7 mph. Chance of precipitation is 30%.
Tuesday Night:
Chance Rain Showers
Lo 65 °F
A chance of rain showers. Mostly cloudy, with a low around 65. Southwest wind around 6 mph.
Tonight 6pm through Fri 5am EDT
Updated Wed Aug 26, 2026 3:04pm EDT
6:00pm
Dew Pt 62°F
Heat Index: 81°F
SE 5 mphPrecip: 0%
7:00pm
Dew Pt 62°F
SE 5 mphPrecip: 0%
8:00pm
Dew Pt 62°F
SE 5 mphPrecip: 0%
9:00pm
Dew Pt 62°F
S 5 mphPrecip: 0%
10:00pm
Dew Pt 62°F
S 5 mphPrecip: 0%
11:00pm
Dew Pt 62°F
S 5 mphPrecip: 0%
12:00am
Dew Pt 62°F
SW 3 mphPrecip: 0%
1:00am
Dew Pt 62°F
SW 3 mphPrecip: 0%
2:00am
Dew Pt 62°F
SW 3 mphPrecip: 0%
3:00am
Dew Pt 62°F
SW 3 mphPrecip: 0%
4:00am
Dew Pt 61°F
SW 3 mphPrecip: 0%
5:00am
Dew Pt 61°F
SW 3 mphPrecip: 0%
6:00am
Dew Pt 61°F
S 3 mphPrecip: 0%
7:00am
Dew Pt 62°F
S 3 mphPrecip: 0%
8:00am
Dew Pt 64°F
S 5 mphPrecip: 0%
9:00am
Dew Pt 66°F
S 5 mphPrecip: 0%
10:00am
Dew Pt 67°F
SW 7 mphPrecip: 1%
11:00am
Dew Pt 67°F
S 8 mphPrecip: 1%
12:00pm
Dew Pt 66°F
Heat Index: 83°F
S 9 mphPrecip: 3%
1:00pm
Dew Pt 66°F
Heat Index: 84°F
S 9 mphPrecip: 5%
2:00pm
Dew Pt 65°F
Heat Index: 84°F
S 10 mphPrecip: 10%
3:00pm
Dew Pt 65°F
Heat Index: 84°F
S 10 mphPrecip: 11%
4:00pm
Dew Pt 65°F
Heat Index: 85°F
S 12 mphPrecip: 10%
5:00pm
Dew Pt 65°F
Heat Index: 83°F
S 10 mphPrecip: 7%
6:00pm
Dew Pt 65°F
Heat Index: 82°F
S 10 mphPrecip: 8%
7:00pm
Dew Pt 66°F
S 9 mphPrecip: 8%
8:00pm
Dew Pt 65°F
S 8 mphPrecip: 13%
9:00pm
Dew Pt 66°F
S 8 mphPrecip: 11%
10:00pm
Dew Pt 66°F
S 7 mphPrecip: 11%
11:00pm
Dew Pt 66°F
S 7 mphPrecip: 13%
12:00am
Dew Pt 67°F
S 7 mphPrecip: 10%
1:00am
Dew Pt 67°F
S 6 mphPrecip: 11%
2:00am
Dew Pt 67°F
S 6 mphPrecip: 19%
3:00am
Dew Pt 67°F
S 5 mphPrecip: 22%
4:00am
Dew Pt 67°F
S 5 mphPrecip: 26%
5:00am
Dew Pt 68°F
S 5 mphPrecip: 30%
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 261900
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
300 PM EDT Wed Aug 26 2026
.WHAT HAS CHANGED...
No significant changes to the forecast.
&&
.KEY MESSAGES...
- Scattered thunderstorms, some of which could be severe late
Thursday, with a few hit and miss thunderstorms possible again
Friday afternoon.
- Mainly dry and seasonable weather follows for this weekend
with comfortable humidity.
- A period or two of unsettled weather may return early next week
with a backdoor cold front in the vicinity of southern New England.
Large spread/high uncertainty on temps dependent on backdoor
cold front/s location.
&&
.DISCUSSION...
KEY MESSAGE 1...Scattered thunderstorms, some of which could be
severe late Thursday, with a few hit and miss thunderstorms possible
again Friday afternoon.
A decent set-up for some strong to severe storms on Thursday, albeit
better to our west where the better forcing is more likely to
overlap the favorable dynamics. Even so, especially for western
MA/CT, particularly along and west of the Connecticut river valley,
some severe storms are certainly possible in the Thursday afternoon
to midnight time frame. This comes courtesy of a marginally deep
upper trough that becomes slightly negatively tilted as it digs into
the northeast. The trough axis remains west of SNE on Thursday into
Friday placing us beneath moist SW flow advecting in PWATS of 1.5-2"
and dewpoints in the upper 60s. This moist flow in the warm sector
will lead to potential for localized downpours some of which, could
cause localized flooding. There is a marginal risk (level 1 of 4)
for flash flooding in western/central MA and CT. This is in addition
to the marginal severe risk (level 1 of 5) thanks to the 1000-2000
J/kg CAPE and 0-6km bulk shear. As previously mentioned, the slower
frontal passage means the better forcing will be to our west, so the
best chance of damaging storms is west of the CT river valley. The
greatest threat is from straight line winds and hail, but 0-1km SRH
values 150-200m2s2 mean a tornado can't be ruled out. By Friday the
front moves through and some scattered afternoon thunderstorms are
possible before a much drier airmass drops in.
KEY MESSAGE 2...Mainly dry and seasonable weather follows for this
weekend with comfortable humidity.
High pressure builds in behind the departing shortwave/cold
front for this weekend. The result will be mainly dry and seasonable
weather Sat into Sun with comfortable humidity. High temps will
mainly be in the upper 70s and 80s with lows in the 50s to the lower
60s.
KEY MESSAGE 3...A period or two of unsettled weather may return
early next week with a backdoor cold front in the vicinity of
southern New England. Large spread/high uncertainty on temps
dependent on backdoor cold front/s location.
Quite a tricky forecast for the first half of next week with a
backdoor cold front in the vicinity. If we end up on the northern
side of the front...it will be cool with highs in the upper 60s and
70s. If we end up south of the backdoor cold front...highs may reach
85-90+. Given the uncertainty we blended the guidance. Current
thinking is we may be on the warmer side Mon and then cooler Tue. It
does seem a decent shot the backdoor cold front temporarily drops
south into at least part of our region on Tue. But again...high
uncertainty on temperatures in the Mon through Wed time frame.
There also will be the risk for some showers at times in the Mon
through Wed time frame. While we are not expecting a complete
washout...thinking a round or two scattered showers and perhaps a
few thunderstorms is reasonable. Timing though remains quite
uncertain at this point.
&&
.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
This afternoon...High confidence.
VFR. Light W-SW winds with local seabreezes along portions of
the very immediate coast. Speeds 6-12 kts.
Tonight...High confidence.
VFR. Calm/light SW winds. IFR in patchy ground fog and stratus
possible late in the typically prone locations.
Thursday...High confidence.
Mainly VFR. Scattered showers and thunderstorms possible after
18Z with greater risk for western MA/CT terminals. Local MVFR
possible in any SHRA and TSRA.
Thursday night...High confidence.
VFR initially then cigs drop to MVFR/IFR for interior terminals
in lingering SHRA/TSRA, mainly through 6-8z.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Thursday Night through Monday/...
Friday: VFR. Chance SHRA, slight chance TSRA.
Friday Night: VFR. Breezy.
Saturday through Saturday Night: VFR.
Sunday: VFR. Breezy.
Sunday Night: VFR. Slight chance SHRA.
Monday: 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.
Through Thursday night...High confidence.
Fairly quiet boating conditions with high pressure over the
waters. Light NW to W winds to start with local seabreezes
towards the coast late this morning and afternoon. Winds become
more S to SW tonight, the increase Thursday. By Thursday
evening, rain and thunderstorm chances increase from east to
west through midnight.
Outlook /Thursday Night through Monday/...
Friday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Slight chance of rain showers.
Friday Night through Saturday: Winds less than 25 kt. Areas of
seas approaching 5 ft.
Saturday Night through Sunday: Winds less than 25 kt.
Sunday Night: Winds less than 25 kt. Slight chance of rain
showers, slight chance of thunderstorms.
Monday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Slight chance of rain showers.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.
&&
$$
DISCUSSION...Frank/BW
AVIATION...Frank/BW
MARINE...Frank/BW
Meta data
Point forecast:
https://api.weather.gov/gridpoints/BOX/65,104/forecast
Zone forecast:
https://api.weather.gov/zones/forecast/MAZ014/forecast
Hourly forecast:
https://api.weather.gov/gridpoints/BOX/65,104/forecast/hourly
Hourly detail:
https://api.weather.gov/gridpoints/BOX/65,104
Point detail:
https://api.weather.gov/points/42.4399,-71.2405
Alerts:
https://api.weather.gov/alerts?status=actual&point=42.4399,-71.2405
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