Lexington Weather

Current Conditions [‒] Current Conditions [+]

82.4°F Colder than last hour.

28.0°C

Feels like 83.5°F

Hot

Clear

Tonight: Lo 55 °F

Thursday: Hi 66 °F

Dew Point: 63.0°F Decreased 0.5°F since last hour.

Humidity: 52% Increased 3.0% since last hour.

Air Quality Index: 37

Good

(Ozone)

Barometer: 29.82 in Rising 0.02 inHg/hr

1010 mb

Rain Rate: 0.00 in/hr

Rain Today: 0.00 in

Rain Tuesday: 0.08 in

Visibility: 10 miles

Wind:

Now: Calm

Avg: Calm

Gusts: 8 mph

OTHER PERSONAL WEATHER STATIONS

Alerts / Advisories [‒] Alerts / Advisories [+]

Southeast Middlesex County, MA - Heat Advisory
- SEE ALL NEARBY ALERTS -

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

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Wed May 20, 2026 2:33pm EDT

Overview:

- Scattered showers and thunderstorms developing through early evening with main focus across CT, RI and SE MA, especially near the south coast. A few strong to severe storms possible.

- Another round of scattered showers later tonight into Thu morning for CT, RI and SE MA. Much cooler Thu then dry and seasonably mild Fri.

- Cooler temperatures through Memorial Day Weekend. Unsettled weather returns for the weekend with periods of rain possible, but confidence is low.

Heat Advisory

Tonight:

Mostly Cloudy

Lo 55 °F

Mostly cloudy, with a low around 55. Northwest wind 7 to 14 mph, with gusts as high as 26 mph.

Thursday:

Mostly Cloudy

Hi 66 °F

Mostly cloudy, with a high near 66. North wind 5 to 8 mph.

Thursday Night:

Mostly Clear

Lo 41 °F

Mostly clear, with a low around 41. North wind around 5 mph.

Friday:

Sunny

Hi 67 °F

Sunny, with a high near 67. East wind 3 to 7 mph.

Friday Night:

Mostly Cloudy

Lo 49 °F

Mostly cloudy, with a low around 49. Southwest wind 1 to 7 mph.

Saturday:

Mostly Cloudy then Slight Chance Rain Showers

Hi 64 °F

A slight chance of rain showers after noon. Mostly cloudy, with a high near 64. Northeast wind 1 to 8 mph. Chance of precipitation is 20%.

Saturday Night:

Rain Showers Likely

Lo 47 °F

Rain showers likely. Mostly cloudy, with a low around 47. East wind around 7 mph. Chance of precipitation is 60%.

Sunday:

Rain Showers Likely

Hi 59 °F

Rain showers likely. Mostly cloudy, with a high near 59. East wind 7 to 10 mph. Chance of precipitation is 70%.

Sunday Night:

Chance Rain Showers

Lo 48 °F

A chance of rain showers. Mostly cloudy, with a low around 48. East wind 3 to 8 mph. Chance of precipitation is 50%.

Memorial Day:

Chance Rain Showers

Hi 70 °F

A chance of rain showers. Mostly cloudy, with a high near 70. North wind 3 to 7 mph. Chance of precipitation is 40%.

Monday Night:

Chance Rain Showers

Lo 53 °F

A chance of rain showers before 4am. Mostly cloudy, with a low around 53. West wind 3 to 7 mph. Chance of precipitation is 30%.

Tuesday:

Slight Chance Rain Showers

Hi 77 °F

A slight chance of rain showers between 8am and 2pm. Mostly sunny, with a high near 77. Northwest wind 3 to 8 mph.

Tuesday Night:

Partly Cloudy

Lo 56 °F

Partly cloudy, with a low around 56. West wind around 6 mph.

Wednesday:

Sunny then Slight Chance Rain Showers

Hi 78 °F

A slight chance of rain showers after 5pm. Sunny, with a high near 78. Northwest wind 3 to 8 mph.

FULL FORECAST

NWS Hourly Forecast -
Tonight 6pm through Fri 5am

Issued by:
National Weather Service Boston / Norton, MA
Updated Wed May 20, 2026 2:33pm EDT

6:00pm

Partly Cloudy

83°F
Dew Pt 59°F
Wind from W

W 14 mph
Precip: 10%

7:00pm

Partly Cloudy

83°F
Dew Pt 56°F
Wind from W

W 13 mph
Precip: 10%

8:00pm

Mostly Cloudy

77°F
Dew Pt 54°F
Wind from W

W 9 mph
Precip: 5%

9:00pm

Mostly Cloudy

73°F
Dew Pt 52°F
Wind from W

W 9 mph
Precip: 7%

10:00pm

Mostly Cloudy

70°F
Dew Pt 50°F
Wind from W

W 8 mph
Precip: 8%

11:00pm

Mostly Cloudy

68°F
Dew Pt 49°F
Wind from NW

NW 7 mph
Precip: 10%

Thu
12:00am

Mostly Cloudy

67°F
Dew Pt 48°F
Wind from NW

NW 7 mph
Precip: 10%

Thu
1:00am

Mostly Cloudy

66°F
Dew Pt 46°F
Wind from N

N 7 mph
Precip: 11%

Thu
2:00am

Mostly Cloudy

64°F
Dew Pt 45°F
Wind from N

N 7 mph
Precip: 12%

Thu
3:00am

Mostly Cloudy

62°F
Dew Pt 43°F
Wind from N

N 7 mph
Precip: 10%

Thu
4:00am

Cloudy

61°F
Dew Pt 41°F
Wind from N

N 7 mph
Precip: 9%

Thu
5:00am

Cloudy

58°F
Dew Pt 40°F
Wind from N

N 8 mph
Precip: 7%

Thu
6:00am

Cloudy

57°F
Dew Pt 39°F
Wind from N

N 8 mph
Precip: 9%

Thu
7:00am

Cloudy

56°F
Dew Pt 38°F
Wind from N

N 7 mph
Precip: 11%

Thu
8:00am

Cloudy

56°F
Dew Pt 38°F
Wind from N

N 7 mph
Precip: 13%

Thu
9:00am

Cloudy

57°F
Dew Pt 38°F
Wind from N

N 6 mph
Precip: 9%

Thu
10:00am

Cloudy

60°F
Dew Pt 37°F
Wind from N

N 6 mph
Precip: 5%

Thu
11:00am

Cloudy

61°F
Dew Pt 37°F
Wind from N

N 5 mph
Precip: 1%

Thu
12:00pm

Mostly Cloudy

62°F
Dew Pt 37°F
Wind from N

N 5 mph
Precip: 2%

Thu
1:00pm

Mostly Cloudy

64°F
Dew Pt 36°F
Wind from NW

NW 5 mph
Precip: 2%

Thu
2:00pm

Mostly Cloudy

64°F
Dew Pt 36°F
Wind from N

N 5 mph
Precip: 3%

Thu
3:00pm

Mostly Cloudy

64°F
Dew Pt 36°F
Wind from N

N 5 mph
Precip: 2%

Thu
4:00pm

Partly Sunny

64°F
Dew Pt 35°F
Wind from N

N 5 mph
Precip: 1%

Thu
5:00pm

Partly Sunny

64°F
Dew Pt 35°F
Wind from N

N 6 mph
Precip: 0%

Thu
6:00pm

Partly Cloudy

64°F
Dew Pt 36°F
Wind from N

N 5 mph
Precip: 0%

Thu
7:00pm

Partly Cloudy

63°F
Dew Pt 36°F
Wind from N

N 3 mph
Precip: 0%

Thu
8:00pm

Partly Cloudy

60°F
Dew Pt 38°F
Wind from N

N 3 mph
Precip: 0%

Thu
9:00pm

Partly Cloudy

57°F
Dew Pt 38°F
Wind from N

N 2 mph
Precip: 0%

Thu
10:00pm

Partly Cloudy

54°F
Dew Pt 37°F
Wind from N

N 2 mph
Precip: 0%

Thu
11:00pm

Partly Cloudy

51°F
Dew Pt 37°F
Wind from N

N 3 mph
Precip: 0%

Fri
12:00am

Partly Cloudy

50°F
Dew Pt 37°F
Wind Chill: 49°F
Wind from N

N 3 mph
Precip: 0%

Fri
1:00am

Partly Cloudy

49°F
Dew Pt 37°F
Wind Chill: 47°F
Wind from N

N 5 mph
Precip: 0%

Fri
2:00am

Mostly Clear

48°F
Dew Pt 37°F
Wind Chill: 46°F
Wind from N

N 5 mph
Precip: 0%

Fri
3:00am

Mostly Clear

46°F
Dew Pt 36°F
Wind Chill: 45°F
Wind from N

N 3 mph
Precip: 0%

Fri
4:00am

Clear

45°F
Dew Pt 35°F
Wind Chill: 44°F
Wind from N

N 3 mph
Precip: 0%

Fri
5:00am

Clear

44°F
Dew Pt 34°F
Wind Chill: 41°F
Wind from N

N 5 mph
Precip: 0%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 201846
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
246 PM EDT Wed May 20 2026

.WHAT HAS CHANGED...
The risk for severe weather has diminished somewhat with best
chance near the south coast. 

&&

.KEY MESSAGES...

- Scattered showers and thunderstorms developing through early
  evening with main focus across CT, RI and SE MA, especially 
  near the south coast. A few strong to severe storms possible. 

- Another round of scattered showers later tonight into Thu
  morning for CT, RI and SE MA. Much cooler Thu then dry and 
  seasonably mild Fri.

- Cooler temperatures through Memorial Day Weekend. Unsettled 
  weather returns for the weekend with periods of rain possible,
  but confidence is low.

&&

.DISCUSSION...
KEY MESSAGE 1...Scattered showers and thunderstorms developing 
through early evening with main focus across CT, RI and SE MA, 
especially near the south coast. A few strong to severe storms 
possible. 

Cold front has pushed southward into northern MA with wind 
shift to W-NW. Winds have veered to the W ahead of the front 
which will limit low level convergence somewhat. As front moves 
south and approaches south coast, expect scattered showers and 
t-storms to develop. This is where best instability, up to 1000 
J/kg of MLCAPE, is located along with best convergence as winds
are more SW near the coast. Effective shear is marginal, up to 
25 kt which is a bit lower than you want to see for storm 
organization. However, steep low level lapse rates and inverted 
V soundings support localized strong to damaging wind gusts with
any stronger storms that develop. The best chance for a few 
strong to severe storms are near the south coast from 5-8 pm, 
with HREF max updraft field targeting southern RI. However, 
severe threat is greatest to the SW. 

KEY MESSAGE 2...Another round of scattered showers late tonight
into Thu morning for CT, RI and SE MA. Much cooler Thu then dry
and seasonably mild Fri.

The cold front moves south of New Eng tonight. A weak wave is 
forecast to develop along the boundary as shortwave energy 
approaches from the west toward Thu morning. Northern edge of 
higher PWATs and deep moisture plume lingers near the south 
coast where scattered showers may redevelop late tonight and 
linger into Thu morning, with best chance along and south of 
HFDL-PVD-PYM. Otherwise, drier air will be pushing south from 
northern New Eng leading to partly sunny skies developing 
across northern MA during the afternoon. Much cooler day Thu as 
925 mb temps drop to 7-9C leading to highs in the 60s. 

The shortwave moves east of New Eng by late Thu followed by 
subsidence then upper ridge builds over the Gt Lakes with dry 
NW flow across New Eng through Fri. The drier air will reach 
the south coast Thu night with clearing skies. Good radiational
cooling will result in a rather chilly night with lows ranging
from the upper 30s to mid 40s. Sunshine and seasonably mild 
temps Fri as high pres builds into the region. Highs will reach 
the upper 60s and lower 70s but cooler along the coast where 
sea-breezes are expected to develop. 

KEY MESSAGE 3...Cooler temperatures through Memorial Day 
Weekend. Unsettled weather returns for the weekend with periods
of rain possible, but confidence is low. 

High pressure and mid-level ridging overhead for Friday 
bringing dry conditions and seasonal temperatures. Expect high 
temperatures in the upper 60s/low 70s for most inland areas 
while easterly flow will keep the east-facing coastline cooler 
in the 60s. 

For the holiday weekend, we continue to see a signal for a 
potentially unsettled weather pattern with a period or two of 
showers. However, there continues to be a notable spread among 
deterministic and ensemble guidance on the track and timing of 
disturbances associated with a larger system moving through the
Ohio Valley. While the ECMWF and some runs of the GFS show rain
chances later Saturday into Sunday, their AI-renditions have 
been dry for Saturday. Beyond that point, differences even 
emerge between the AI guidance on the timing of rain sometime 
Sun or Mon. This spread in solutions has lead to a bullish view 
when assessing the ensemble guidance for rain probabilities over
the weekend. Ensembles have blanketed southern New England with
moderate probabilities for at least 0.01" of rain later Sat 
into Sun and Monday. Given the notable spread in guidance, rain 
chances are still low confidence for the holiday weekend. 
Leaning toward a wetter weekend based on range of ensemble 
guidance leaning in that direction. On the positive side, if 
Saturday ends up wetter, there is some agreement with the 
showers coming in later Saturday which at least keeps part of 
that day potentially dry! Given that guidance is leaning more 
unsettled, temperatures this weekend will be cooler in the 50s 
and low 60s. There is a signal for temperatures to trend warmer 
into early next week. 

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
Forecaster Confidence Levels...

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

18Z TAF Update... 

Through 02z...Moderate confidence.

Mainly VFR. A few showers possible along and north of the MA 
Pike through 20z. Scattered SHRA/TSRA developing across 
CT/RI/SE MA after 20z. Any t-storms will be accompanied by 
downpours and brief gusty winds. Localized stratus may impact
ACK this evening. W gusts to 25 kt diminishing this evening. 

Tonight and Thursday...High confidence.

Mainly VFR cigs. Scattered showers redeveloping near the south 
coast overnight into Thu morning with brief MVFR possible. NW 
wind 5-15 kt this evening becoming light N overnight. Sea- 
breezes developing Thu. 

Thursday night...High confidence.

VFR. Light wind. 

KBOS...High confidence in TAF.

KBDL...High confidence in TAF.

Outlook /Friday through Monday/...

Friday through Friday Night: VFR. 

Saturday: VFR. Chance SHRA.

Saturday Night through Sunday: VFR. Breezy. SHRA likely.

Sunday Night: VFR. Chance SHRA.

Memorial Day: Mainly VFR, with local MVFR possible. Chance
SHRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Wednesday Night: High confidence. 

SW gusts to 25 kt over nearshore waters will diminish this
evening with seas gradually subsiding tonight. Winds will shift
to NW this evening then N overnight. NE wind Thu morning with 
sea-breezes developing over nearshore waters in the afternoon.
Light winds Thu night becoming N-NE overnight. 

Outlook /Friday through Monday/...

Friday through Friday Night: Winds less than 25 kt. 

Saturday: Winds less than 25 kt. Chance of rain showers. 

Saturday Night through Sunday: Low risk for Small Craft
Advisory winds with gusts up to 25 kt. Local rough seas. Rain
showers likely. 

Sunday Night: Winds less than 25 kt. Seas up to 5 ft. Rain
showers likely. 

Memorial Day: Winds less than 25 kt. Seas up to 5 ft. Chance of
rain showers. 

&&

.CLIMATE...
Record Highs for Wed May 20...

BOS 91/1996
BDL 99/1996
PVD 95/1996
ORH 91/1903

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Heat Advisory until 8 PM EDT this evening for CTZ002>004.
MA...Heat Advisory until 8 PM EDT this evening for MAZ005>007-
     010>019.
RI...Heat Advisory until 8 PM EDT this evening for RIZ001>004.
MARINE...Small Craft Advisory until 8 PM EDT this evening for ANZ230-
     232>235-237.
     Small Craft Advisory until 2 AM EDT Thursday for ANZ254>256.

&&

$$

DISCUSSION...KJC/Mensch
AVIATION...KJC
MARINE...KJC
CLIMATE...BW

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