Lexington Weather

Current Conditions [‒] Current Conditions [+]

66.6°F Colder than last hour.

19.2°C

Comfortable

Clear

Today: Hi 65 °F

Tonight: Lo 42 °F

Dew Point: 43.3°F Decreased 2.6°F since last hour.

Humidity: 43% Decreased 4.0% since last hour.

Air Quality Index: 22

Good

(Ozone)

Barometer: 30.13 in S

1020 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 -
Today, Tonight, & Friday through Wednesday Night

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Thu May 21, 2026 6:42am EDT

Overview:

- Seasonable temps with scattered showers Thursday morning, lingering longest over CT, RI and SE MA. Dry and mild weather continues Friday.

- Cooler temperatures through Memorial Day Weekend. Unsettled weather returns for the weekend, but not a washout every day. Sunday is the wettest of the three days.

Today:

Slight Chance Rain Showers then Cloudy

Hi 65 °F

A slight chance of rain showers before 11am. Cloudy, with a high near 65. North wind around 7 mph. Chance of precipitation is 20%.

Tonight:

Mostly Cloudy

Lo 42 °F

Mostly cloudy, with a low around 42. North wind around 5 mph.

Friday:

Mostly Sunny

Hi 65 °F

Mostly sunny, with a high near 65. East wind around 7 mph.

Friday Night:

Mostly Cloudy

Lo 48 °F

Mostly cloudy, with a low around 48. Southwest wind 1 to 7 mph.

Saturday:

Mostly Cloudy

Hi 64 °F

Mostly cloudy, with a high near 64. East wind 1 to 8 mph.

Saturday Night:

Rain Showers Likely

Lo 47 °F

Rain showers likely after 8pm. Cloudy, with a low around 47. East wind 3 to 7 mph. Chance of precipitation is 60%.

Sunday:

Rain Showers

Hi 57 °F

Rain showers. Cloudy, with a high near 57. East wind 7 to 10 mph. Chance of precipitation is 80%.

Sunday Night:

Rain Showers Likely

Lo 49 °F

Rain showers likely. Cloudy, with a low around 49. East wind 5 to 9 mph. Chance of precipitation is 70%.

Memorial Day:

Chance Rain Showers

Hi 68 °F

A chance of rain showers. Cloudy, with a high near 68. North wind around 6 mph. Chance of precipitation is 40%.

Monday Night:

Chance Rain Showers

Lo 53 °F

A chance of rain showers before 2am. Mostly cloudy, with a low around 53. Southwest wind around 5 mph. Chance of precipitation is 30%.

Tuesday:

Mostly Sunny

Hi 79 °F

Mostly sunny, with a high near 79. Northwest wind 2 to 7 mph.

Tuesday Night:

Partly Cloudy

Lo 57 °F

Partly cloudy, with a low around 57. West wind around 7 mph.

Wednesday:

Mostly Sunny then Slight Chance Rain Showers

Hi 79 °F

A slight chance of rain showers after 2pm. Mostly sunny, with a high near 79. Northwest wind 5 to 9 mph.

Wednesday Night:

Slight Chance Rain Showers then Partly Cloudy

Lo 55 °F

A slight chance of rain showers before 8pm. Partly cloudy, with a low around 55. Northwest wind 3 to 7 mph.

FULL FORECAST

NWS Hourly Forecast -
Today 2pm through Sat 1am

Issued by:
National Weather Service Boston / Norton, MA
Updated Thu May 21, 2026 6:42am EDT

2:00pm

Mostly Cloudy

64°F
Dew Pt 37°F
Wind from NW

NW 5 mph
Precip: 8%

3:00pm

Mostly Cloudy

64°F
Dew Pt 37°F
Wind from NW

NW 5 mph
Precip: 8%

4:00pm

Mostly Cloudy

65°F
Dew Pt 36°F
Wind from N

N 5 mph
Precip: 7%

5:00pm

Mostly Cloudy

64°F
Dew Pt 36°F
Wind from N

N 5 mph
Precip: 6%

6:00pm

Mostly Cloudy

63°F
Dew Pt 37°F
Wind from N

N 3 mph
Precip: 5%

7:00pm

Mostly Cloudy

62°F
Dew Pt 37°F
Wind from N

N 3 mph
Precip: 4%

8:00pm

Mostly Cloudy

59°F
Dew Pt 38°F
Wind from NE

NE 3 mph
Precip: 4%

9:00pm

Mostly Cloudy

55°F
Dew Pt 38°F
Wind from NE

NE 3 mph
Precip: 3%

10:00pm

Mostly Cloudy

53°F
Dew Pt 38°F
Wind from N

N 3 mph
Precip: 2%

11:00pm

Mostly Cloudy

51°F
Dew Pt 38°F
Wind from N

N 3 mph
Precip: 1%

Fri
12:00am

Mostly Cloudy

49°F
Dew Pt 38°F
Wind Chill: 48°F
Wind from N

N 3 mph
Precip: 1%

Fri
1:00am

Mostly Cloudy

47°F
Dew Pt 37°F
Wind Chill: 46°F
Wind from N

N 5 mph
Precip: 0%

Fri
2:00am

Mostly Cloudy

46°F
Dew Pt 37°F
Wind Chill: 44°F
Wind from N

N 5 mph
Precip: 0%

Fri
3:00am

Partly Cloudy

45°F
Dew Pt 37°F
Wind Chill: 43°F
Wind from N

N 5 mph
Precip: 0%

Fri
4:00am

Partly Cloudy

43°F
Dew Pt 36°F
Wind Chill: 40°F
Wind from N

N 5 mph
Precip: 0%

Fri
5:00am

Mostly Clear

42°F
Dew Pt 35°F
Wind Chill: 39°F
Wind from N

N 5 mph
Precip: 0%

Fri
6:00am

Sunny

43°F
Dew Pt 35°F
Wind Chill: 40°F
Wind from N

N 5 mph
Precip: 0%

Fri
7:00am

Sunny

46°F
Dew Pt 36°F
Wind Chill: 44°F
Wind from NE

NE 5 mph
Precip: 0%

Fri
8:00am

Sunny

50°F
Dew Pt 35°F
Wind Chill: 48°F
Wind from NE

NE 6 mph
Precip: 0%

Fri
9:00am

Sunny

53°F
Dew Pt 34°F
Wind from NE

NE 6 mph
Precip: 0%

Fri
10:00am

Sunny

57°F
Dew Pt 33°F
Wind from NE

NE 6 mph
Precip: 0%

Fri
11:00am

Mostly Sunny

58°F
Dew Pt 33°F
Wind from NE

NE 7 mph
Precip: 0%

Fri
12:00pm

Mostly Sunny

62°F
Dew Pt 33°F
Wind from E

E 7 mph
Precip: 0%

Fri
1:00pm

Mostly Sunny

64°F
Dew Pt 33°F
Wind from E

E 7 mph
Precip: 0%

Fri
2:00pm

Mostly Sunny

64°F
Dew Pt 32°F
Wind from E

E 7 mph
Precip: 0%

Fri
3:00pm

Partly Sunny

64°F
Dew Pt 32°F
Wind from E

E 7 mph
Precip: 0%

Fri
4:00pm

Partly Sunny

65°F
Dew Pt 32°F
Wind from E

E 7 mph
Precip: 0%

Fri
5:00pm

Partly Sunny

64°F
Dew Pt 32°F
Wind from SE

SE 7 mph
Precip: 0%

Fri
6:00pm

Mostly Cloudy

63°F
Dew Pt 32°F
Wind from SE

SE 7 mph
Precip: 0%

Fri
7:00pm

Mostly Cloudy

62°F
Dew Pt 33°F
Wind from SE

SE 6 mph
Precip: 0%

Fri
8:00pm

Mostly Cloudy

58°F
Dew Pt 34°F
Wind from SE

SE 5 mph
Precip: 0%

Fri
9:00pm

Partly Cloudy

56°F
Dew Pt 34°F
Wind from SE

SE 3 mph
Precip: 0%

Fri
10:00pm

Mostly Cloudy

54°F
Dew Pt 35°F
Wind from S

S 3 mph
Precip: 0%

Fri
11:00pm

Mostly Cloudy

53°F
Dew Pt 36°F
Wind from S

S 3 mph
Precip: 0%

Sat
12:00am

Mostly Cloudy

52°F
Dew Pt 37°F
Wind from S

S 2 mph
Precip: 0%

Sat
1:00am

Mostly Cloudy

51°F
Dew Pt 37°F
Wind from SW

SW 2 mph
Precip: 0%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 211659
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
1259 PM EDT Thu May 21 2026

.WHAT HAS CHANGED...
Sunday looking like the wettest day of the holiday weekend with 
drier days on either side.

&&

.KEY MESSAGES...

- Seasonable temps with scattered showers Thursday morning,
  lingering longest over CT, RI and SE MA. Dry and mild weather 
  continues Friday. 

- Cooler temperatures through Memorial Day Weekend. Unsettled
  weather returns for the weekend, but not a washout every day.
  Sunday is the wettest of the three days.

&&

.DISCUSSION...
KEY MESSAGE 1...Seasonable temps with scattered showers Thursday 
morning, lingering longest over CT, RI and SE MA. Dry and mild 
weather continues Friday. 

As the low pressure moves off into the North Atlantic, Thursday will 
be a transition between two starkly different airmasses. The post 
frontal airmass has arrived with cooler NW flow in place across SNE. 
High pressure over the Great Lakes will be slow to advance eastward 
over the next 24 hours as will the drier air it brings with it. We 
remain on the northern periphery of deeper moisture to our south. 
With zonal flow in the mid levels and a weak shortwave this morning 
we'll see a resurgence of light showers, lingering longest over CT, 
RI, and southeast MA through noon. By afternoon drier air sinks 
further south and skies will clear making way for a good radiational 
cooling night under high pressure so have leaned on MOS guidance for 
low temps. Expect plenty of sun Friday under strong subsidence, with 
highs in the upper 60s to low 70s (normal for late May). 

KEY MESSAGE 2...Cooler temperatures through Memorial Day Weekend. 
Unsettled weather returns for the weekend, but not a washout every 
day. Sunday is the wettest of the three days. 

Guidance is slowly coming into better agreement on the weather for 
the upcoming holiday weekend. While we continue to forecast a cooler 
than normal weekend with wet weather, the full three day weekend 
shouldn't be a washout. As it stands now, surface high pressure will 
be fighting to keep low pressure from the OH valley and its 
associated wet weather at bay as long as possible; this means the 
earlier in the day on Saturday the better chance we stay dry, it 
could even hold out for a fully dry Saturday, especially toward 
northeast/north central MA. Eventually the shortwave and wet weather 
move over SNE Saturday night/Sunday and this looks to be the most 
likely "washout" day before the low moves east of MA by Monday with 
drier air funneling in and making for a more pleasant day than 
Sunday. Sunday will also be breezy as a 25-35kt LLJ moves overhead. 
Temperatures bottom out on Sunday with highs in the upper 50s, 
warming into the upper 60s and 70s by Monday.

&&

.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... 

Through Tonight...High confidence.

VFR. Few lingering rain showers along the immediate coast come to an 
end this evening, but not expecting any operational impacts. N wind 
5-10 kt with sea-breezes. Winds becoming light/variable or calm 
overnight. 

Friday...High confidence. 

VFR. NE winds 5-10 kt. 

Friday Night...High confidence. 

VFR. Increasing mid and high-level clouds NE winds less than 5 kt. 

KBOS...High confidence in TAF.

KBDL...High confidence in TAF.

Outlook /Friday Night through Tuesday/...

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.

Winds NW 10-15 kts with sea-breezes developing over nearshore 
waters in the afternoon. Light winds Thu night becoming N-NE 
overnight into Friday. 

Outlook /Friday Night through Tuesday/...

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.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.

&&

$$

DISCUSSION...BW
AVIATION...Dooley
MARINE...BW

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