Lexington Weather

Current Conditions [‒] Current Conditions [+]

69.3°F Colder than last hour.

20.7°C

Muggy

Clear

Tonight: Lo 61 °F

Thursday: Hi 83 °F

Dew Point: 64.2°F Decreased 0.2°F since last hour.

Humidity: 84% Increased 2.0% since last hour.

Barometer: 30.01 in S

1016 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

OTHER PERSONAL WEATHER STATIONS

REGIONAL CONDITIONS

NWS Weather Forecast -
Tonight, Thursday, & Thursday Night through Wednesday

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Wed Aug 26, 2026 6:39pm 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.

Tonight:

Mostly Cloudy

Lo 61 °F

Mostly cloudy, with a low around 61. South wind around 3 mph.

Thursday:

Partly Sunny

Hi 83 °F

Partly sunny, with a high near 83. South wind 3 to 14 mph.

Thursday Night:

Mostly Cloudy then Chance Showers And T-Storms

Lo 69 °F

Thursday Night: Mostly Cloudy then Chance Showers And Thunderstorms

Patchy fog between 1am and 2am, then a chance of rain showers and patchy fog between 2am and 5am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 69. South wind 6 to 13 mph. Chance of precipitation is 30%.

Friday:

Chance Showers And T-Storms then Slight Chance Showers And T-Storms

Hi 84 °F

Friday: Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms

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

Friday Night: Chance Showers And Thunderstorms then Partly Cloudy

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

Monday: Partly Sunny then Slight Chance Showers And Thunderstorms

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

Monday Night: Chance Showers And Thunderstorms

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. Chance of precipitation is 40%.

Wednesday:

Chance Rain Showers

Hi 79 °F

A chance of rain showers. Mostly cloudy, with a high near 79. West wind 3 to 8 mph.

FULL FORECAST

NWS Hourly Forecast -
Today 12am through Fri 11am

Issued by:
National Weather Service Boston / Norton, MA
Updated Wed Aug 26, 2026 6:39pm EDT

12:00am

Mostly Cloudy

66°F
Dew Pt 62°F
Wind from S

S 3 mph
Precip: 0%

1:00am

Mostly Cloudy

64°F
Dew Pt 62°F
Wind from S

S 3 mph
Precip: 0%

2:00am

Mostly Cloudy

63°F
Dew Pt 62°F
Wind from S

S 2 mph
Precip: 0%

3:00am

Mostly Cloudy

62°F
Dew Pt 61°F
Wind from S

S 2 mph
Precip: 0%

4:00am

Mostly Cloudy

61°F
Dew Pt 60°F
Wind from S

S 2 mph
Precip: 0%

5:00am

Mostly Cloudy

61°F
Dew Pt 60°F
Wind from S

S 2 mph
Precip: 0%

6:00am

Mostly Cloudy

62°F
Dew Pt 60°F
Wind from S

S 3 mph
Precip: 0%

7:00am

Partly Sunny

64°F
Dew Pt 62°F
Wind from S

S 5 mph
Precip: 0%

8:00am

Partly Sunny

67°F
Dew Pt 63°F
Wind from S

S 5 mph
Precip: 0%

9:00am

Mostly Sunny

71°F
Dew Pt 64°F
Wind from S

S 7 mph
Precip: 0%

10:00am

Mostly Sunny

75°F
Dew Pt 65°F
Wind from S

S 8 mph
Precip: 1%

11:00am

Mostly Sunny

78°F
Dew Pt 65°F
Wind from S

S 9 mph
Precip: 1%

12:00pm

Partly Sunny

80°F
Dew Pt 65°F
Heat Index: 82°F
Wind from S

S 10 mph
Precip: 3%

1:00pm

Partly Sunny

81°F
Dew Pt 64°F
Heat Index: 83°F
Wind from S

S 12 mph
Precip: 5%

2:00pm

Partly Sunny

82°F
Dew Pt 64°F
Heat Index: 83°F
Wind from S

S 13 mph
Precip: 10%

3:00pm

Mostly Cloudy

82°F
Dew Pt 64°F
Heat Index: 83°F
Wind from S

S 13 mph
Precip: 11%

4:00pm

Mostly Cloudy

82°F
Dew Pt 64°F
Heat Index: 83°F
Wind from S

S 14 mph
Precip: 10%

5:00pm

Partly Sunny

81°F
Dew Pt 64°F
Heat Index: 83°F
Wind from S

S 14 mph
Precip: 7%

6:00pm

Mostly Cloudy

79°F
Dew Pt 64°F
Wind from S

S 13 mph
Precip: 8%

7:00pm

Mostly Cloudy

77°F
Dew Pt 66°F
Wind from S

S 13 mph
Precip: 8%

8:00pm

Mostly Cloudy

74°F
Dew Pt 66°F
Wind from S

S 12 mph
Precip: 13%

9:00pm

Mostly Cloudy

73°F
Dew Pt 66°F
Wind from S

S 10 mph
Precip: 11%

10:00pm

Mostly Cloudy

73°F
Dew Pt 67°F
Wind from S

S 10 mph
Precip: 11%

11:00pm

Mostly Cloudy

73°F
Dew Pt 67°F
Wind from S

S 9 mph
Precip: 13%

Fri
12:00am

Mostly Cloudy

72°F
Dew Pt 68°F
Wind from S

S 8 mph
Precip: 10%

Fri
1:00am

Patchy Fog

72°F
Dew Pt 68°F
Wind from S

S 8 mph
Precip: 11%

Fri
2:00am

Patchy Fog

72°F
Dew Pt 68°F
Wind from S

S 7 mph
Precip: 19%

Fri
3:00am

Slight Chance Rain Showers

71°F
Dew Pt 68°F
Wind from S

S 7 mph
Precip: 22%

Fri
4:00am

Chance Rain Showers

70°F
Dew Pt 68°F
Wind from S

S 6 mph
Precip: 26%

Fri
5:00am

Chance Showers And Thunderstorms

70°F
Dew Pt 68°F
Wind from S

S 6 mph
Precip: 30%

Fri
6:00am

Chance Showers And Thunderstorms

70°F
Dew Pt 68°F
Wind from S

S 6 mph
Precip: 37%

Fri
7:00am

Chance Showers And Thunderstorms

71°F
Dew Pt 68°F
Wind from S

S 6 mph
Precip: 31%

Fri
8:00am

Slight Chance Rain Showers

72°F
Dew Pt 68°F
Wind from S

S 6 mph
Precip: 21%

Fri
9:00am

Slight Chance Rain Showers

72°F
Dew Pt 70°F
Wind from S

S 3 mph
Precip: 21%

Fri
10:00am

Slight Chance Rain Showers

74°F
Dew Pt 70°F
Wind from SW

SW 3 mph
Precip: 21%

Fri
11:00am

Slight Chance Showers And Thunderstorms

77°F
Dew Pt 70°F
Wind from SW

SW 5 mph
Precip: 22%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 262332
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
732 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 /00Z THURSDAY THROUGH MONDAY/...

Forecaster Confidence Levels...

Low - less than 30 percent. 
Moderate - 30 to 60 percent. 
High - greater than 60 percent.

00z TAF Update...

Tonight...High confidence. 

VFR outside some very localized brief patchy ground fog possible
late tonight in the typically most prone locations.

Thursday and Thursday night...High confidence in TAF but low
confidence in areal coverage and eastward extent on the
potential of scattered showers and isolated t-storms.

High confidence in mainly VFR conditions into early Thursday
evening outside any scattered showers/isolated t-storms that
develop. MVFR to localized IFR conditions will gradually
overspread portions of the region from west to east later Thu
night. 

As for the scattered showers/isolated thunderstorm
risk...uncertain on how far east activity advances into our
region. The main risk will be in the 20z to 03z time frame 
generally across interior MA/CT with the greatest risk west of 
the CT River Valley. Eastward extent of convective potential 
remains highly uncertain. 

KBOS Terminal...High confidence in TAF.

KBDL Terminal...High confidence in TAF. We will need to watch
for a few thunderstorms in the vicinity of the terminal later
Thu into Thu night. 

Outlook /Friday 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...BW/Frank
AVIATION...BW/Frank
MARINE...BW/Frank

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