Lexington Weather

Current Conditions [‒] Current Conditions [+]

45.3°F Warmer than last hour.

7.4°C

Chilly

Overcast

Overnight: Lo 41 °F

Tuesday: Hi 62 °F

Dew Point: 35.8°F Decreased 0.5°F since last hour.

Humidity: 69% Decreased 2.0% since last hour.

Air Quality Index: 19

Good

(Ozone)

Barometer: 30.05 in S

1018 mb

Rain Rate: 0.00 in/hr

Rain Today: 0.00 in

Rain Monday: 0.01 in

Visibility: 10 miles

Wind:

Now: Calm

Avg: Calm

Gusts: 0 mph

OTHER PERSONAL WEATHER STATIONS

REGIONAL CONDITIONS

NWS Weather Forecast -
Overnight, Tuesday, & Tuesday Night through Monday

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Tue May 12, 2026 3:22am EDT

Overview:

- Dry and seasonably cool conditions through the first half of Wednesday.

- Unsettled midweek pattern with increasing chances for beneficial rainfall.

- Warm and mainly dry weekend pattern, but details remain uncertain.

Overnight:

Mostly Cloudy

Lo 41 °F

Mostly cloudy, with a low around 41. Northwest wind around 6 mph.

Tuesday:

Sunny

Hi 62 °F

Sunny, with a high near 62. Northwest wind around 8 mph.

Tuesday Night:

Partly Cloudy

Lo 45 °F

Partly cloudy, with a low around 45. West wind 1 to 7 mph.

Wednesday:

Chance Rain Showers then Mostly Cloudy

Hi 61 °F

A chance of rain showers between 7am and noon. Mostly cloudy, with a high near 61. South wind 2 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

Wednesday Night:

Cloudy then Chance Rain Showers

Lo 50 °F

A chance of rain showers after midnight. Cloudy, with a low around 50. South wind 8 to 13 mph. Chance of precipitation is 30%.

Thursday:

Rain Showers

Hi 63 °F

Rain showers and patchy fog before 5pm, then showers and thunderstorms. Cloudy, with a high near 63. Southeast wind around 9 mph. Chance of precipitation is 100%.

Thursday Night:

Showers And T-Storms

Lo 48 °F

Thursday Night: Showers And Thunderstorms

Showers and thunderstorms before 9pm, then patchy fog and showers and thunderstorms between 9pm and 11pm, then patchy fog and showers and thunderstorms. Cloudy, with a low around 48. Northeast wind around 7 mph. Chance of precipitation is 100%.

Friday:

Patchy Fog

Hi 61 °F

Patchy fog and showers and thunderstorms. Mostly cloudy, with a high near 61. North wind around 7 mph. Chance of precipitation is 80%.

Friday Night:

Chance Showers And T-Storms then Mostly Cloudy

Lo 48 °F

Friday Night: Chance Showers And Thunderstorms then Mostly Cloudy

A chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 48. Northwest wind around 6 mph. Chance of precipitation is 30%.

Saturday:

Mostly Sunny

Hi 75 °F

Mostly sunny, with a high near 75. West wind 5 to 10 mph.

Saturday Night:

Mostly Clear

Lo 56 °F

Mostly clear, with a low around 56. West wind around 9 mph.

Sunday:

Sunny

Hi 79 °F

Sunny, with a high near 79. West wind 7 to 10 mph.

Sunday Night:

Mostly Clear

Lo 55 °F

Mostly clear, with a low around 55. West wind 3 to 9 mph.

Monday:

Sunny

Hi 80 °F

Sunny, with a high near 80. Southwest wind 3 to 8 mph.

FULL FORECAST

NWS Hourly Forecast -
Today 5am through Wed 4pm

Issued by:
National Weather Service Boston / Norton, MA
Updated Tue May 12, 2026 3:22am EDT

5:00am

Mostly Cloudy

41°F
Dew Pt 33°F
Wind Chill: 37°F
Wind from NW

NW 6 mph
Precip: 1%

6:00am

Mostly Sunny

41°F
Dew Pt 33°F
Wind Chill: 37°F
Wind from NW

NW 6 mph
Precip: 0%

7:00am

Sunny

41°F
Dew Pt 34°F
Wind Chill: 36°F
Wind from N

N 7 mph
Precip: 0%

8:00am

Sunny

48°F
Dew Pt 35°F
Wind Chill: 45°F
Wind from N

N 7 mph
Precip: 0%

9:00am

Sunny

51°F
Dew Pt 33°F
Wind from N

N 7 mph
Precip: 0%

10:00am

Sunny

54°F
Dew Pt 32°F
Wind from N

N 7 mph
Precip: 0%

11:00am

Sunny

56°F
Dew Pt 30°F
Wind from N

N 7 mph
Precip: 0%

12:00pm

Sunny

58°F
Dew Pt 29°F
Wind from NW

NW 8 mph
Precip: 0%

1:00pm

Mostly Sunny

59°F
Dew Pt 29°F
Wind from NW

NW 8 mph
Precip: 0%

2:00pm

Mostly Sunny

60°F
Dew Pt 28°F
Wind from NW

NW 8 mph
Precip: 0%

3:00pm

Mostly Sunny

61°F
Dew Pt 28°F
Wind from NW

NW 8 mph
Precip: 0%

4:00pm

Mostly Sunny

62°F
Dew Pt 28°F
Wind from NW

NW 8 mph
Precip: 0%

5:00pm

Mostly Sunny

61°F
Dew Pt 27°F
Wind from NW

NW 8 mph
Precip: 0%

6:00pm

Mostly Clear

60°F
Dew Pt 29°F
Wind from NW

NW 7 mph
Precip: 0%

7:00pm

Mostly Clear

58°F
Dew Pt 32°F
Wind from NW

NW 5 mph
Precip: 0%

8:00pm

Mostly Clear

55°F
Dew Pt 34°F
Wind from NW

NW 3 mph
Precip: 0%

9:00pm

Mostly Clear

53°F
Dew Pt 35°F
Wind from NW

NW 2 mph
Precip: 0%

10:00pm

Mostly Clear

51°F
Dew Pt 35°F
Wind from W

W 2 mph
Precip: 0%

11:00pm

Mostly Clear

49°F
Dew Pt 35°F
Wind from W

W 1 mph
Precip: 0%

Wed
12:00am

Mostly Clear

47°F
Dew Pt 35°F
Wind from W

W 2 mph
Precip: 0%

Wed
1:00am

Partly Cloudy

46°F
Dew Pt 35°F
Wind from SW

SW 2 mph
Precip: 0%

Wed
2:00am

Mostly Cloudy

45°F
Dew Pt 35°F
Wind from SW

SW 2 mph
Precip: 0%

Wed
3:00am

Mostly Cloudy

45°F
Dew Pt 36°F
Wind from SW

SW 2 mph
Precip: 0%

Wed
4:00am

Mostly Cloudy

45°F
Dew Pt 36°F
Wind from SW

SW 2 mph
Precip: 0%

Wed
5:00am

Mostly Cloudy

45°F
Dew Pt 36°F
Wind from S

S 2 mph
Precip: 2%

Wed
6:00am

Mostly Cloudy

46°F
Dew Pt 36°F
Wind from S

S 2 mph
Precip: 10%

Wed
7:00am

Slight Chance Rain Showers

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

S 3 mph
Precip: 19%

Wed
8:00am

Chance Rain Showers

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

S 3 mph
Precip: 28%

Wed
9:00am

Chance Rain Showers

51°F
Dew Pt 39°F
Wind from S

S 5 mph
Precip: 25%

Wed
10:00am

Slight Chance Rain Showers

54°F
Dew Pt 40°F
Wind from S

S 6 mph
Precip: 22%

Wed
11:00am

Slight Chance Rain Showers

55°F
Dew Pt 42°F
Wind from S

S 8 mph
Precip: 19%

Wed
12:00pm

Cloudy

57°F
Dew Pt 42°F
Wind from S

S 9 mph
Precip: 14%

Wed
1:00pm

Cloudy

57°F
Dew Pt 42°F
Wind from S

S 10 mph
Precip: 10%

Wed
2:00pm

Cloudy

58°F
Dew Pt 42°F
Wind from S

S 12 mph
Precip: 5%

Wed
3:00pm

Cloudy

58°F
Dew Pt 42°F
Wind from S

S 12 mph
Precip: 7%

Wed
4:00pm

Cloudy

58°F
Dew Pt 42°F
Wind from S

S 13 mph
Precip: 9%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 120601
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
201 AM EDT Tue May 12 2026

.WHAT HAS CHANGED...
No significant changes.

&&

.KEY MESSAGES...

- Dry and seasonably cool conditions through the first half of 
  Wednesday.

- Unsettled midweek pattern with increasing chances for 
  beneficial rainfall.

- Warm and mainly dry weekend pattern, but details remain
  uncertain.

&&

.DISCUSSION...
KEY MESSAGE 1...Dry and seasonably cool conditions through the first 
half of Wednesday.

An amplified mid-level trough and embedded shortwave cross southern 
New England early this morning. Outside of an isolated brief shower, 
impacts are limited to increased cloud cover. Clearing develops 
first across northwestern Massachusetts, where light winds support 
radiational cooling. Lows fall into the mid 30s in the coldest 
spots, with patchy frost possible. Most locations bottom out in the 
upper 30s to lower 40s. The trough shifts offshore today, yielding 
fair-weather cu and abundant sunshine. Despite sunshine, cool 
conditions persist with 850mb temps near -1C to +1C, supporting 
highs in the upper 50s to mid 60s. A weak pressure gradient brings 
uncertainty to sea breeze development across eastern Massachusetts. 
Otherwise, NW winds remain around 8 to 12 mph with generally quiet 
conditions expected. CU diminishes this evening, followed by 
increasing clouds overnight ahead of the next system. Cloud cover 
will limit radiational cooling, with lows Wednesday morning mainly 
in the 40s. Dry weather persists for many through at least the first 
half of Wednesday as high pressure shifts offshore and low pressure 
develops over the eastern Great Lakes.

KEY MESSAGE 2...Unsettled midweek pattern with increasing chances 
for beneficial rainfall.

High pressure shifts east Wednesday as the next system approaches 
from the west. Flow turns SW, advecting higher moisture with PWATs 
increasing to 0.8 to 1.0 inches across southern New England by late 
morning. Latest guidance supports an earlier onset of precipitation, 
generally mid to late morning, as a warm frontal zone lifts through 
the region. Best forcing initially focuses across western MA and 
northwest/north-central CT. After a possible relative decrease in 
coverage during the afternoon, rain expands eastward late Wednesday 
into Thursday (primarily after 00Z) as a longwave trough becomes cut 
off over northern New England and southern Quebec before slowly 
drifting southeast toward the region Friday. As the mid-level and 
surface lows become vertically stacked, widespread unsettled 
conditions persist through Thursday, with gradual improvement Friday 
afternoon as high pressure builds in from the southwest and ridging 
develops to the west. This system continues to favor beneficial 
rainfall. Ensemble guidance shows moderate probabilities for 0.5"+ 
QPF, with ECMWF/CMC ensembles in the 70 to 90 percent range and GEFS 
lower at 30 to 60 percent. Ensemble percentiles generally support 
0.3 to 0.6 inches at the 25th percentile and 0.8 to 1.2 inches at 
the 75th percentile. Temperatures remain below normal through the 
period, with highs in the lower to mid 60s Wednesday through Friday. 
If the cutoff exits faster, Friday could trend milder.

KEY MESSAGE 3...Warm and mainly dry weekend pattern, but details 
remain uncertain.

Upper trough exits and heights rise into the weekend and early next 
week, supporting above-normal temperatures with highs in the 70s, 
possibly approaching 80 degrees in warmer locations. Confidence is 
lower regarding timing and coverage of any precipitation due to 
potential embedded shortwaves, but overall trends favor mainly dry 
conditions with only low-probability scattered showers or 
thunderstorms Saturday into Sunday. By Monday, an anomalous ridge 
builds over the Northeast, supporting continued dry and warm 
conditions into early next week.

&&

.AVIATION /06Z TUESDAY THROUGH SATURDAY/...
Forecaster Confidence Levels...

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

06Z TAF UPDATE:

Today and Tonight...High confidence.

VFR. NW winds 7 to 10 kt. Sea breeze remains possible for KBOS 
around 15z to 16Z, though development may be limited if NW winds 
remain slightly stronger. Winds become light WNW/W tonight.

Wednesday...High confidence.

VFR early. -SHRA possible across western terminals late morning. 
Conditions trend MVFR west to east Wednesday evening with -RA. 
Winds S 10 to 15 kt.

KBOS...Moderate confidence.

VFR. Sea breeze development possible after 15z to 16Z. Slightly 
stronger NW flow may keep the sea breeze offshore or oscillating 
near the coast during the afternoon.

KBDL...High confidence.

VFR.

Outlook /Wednesday Night through Saturday/...

Wednesday Night: Mainly VFR, with local IFR possible. Breezy.
Chance SHRA, patchy BR.

Thursday: Mainly MVFR, with local IFR possible. Breezy. SHRA,
slight chance TSRA, patchy BR.

Thursday Night: Mainly MVFR, with areas IFR possible. SHRA,
slight chance TSRA, patchy BR.

Friday: MVFR/IFR conditions possible. Chance SHRA.

Friday Night: Mainly VFR, with local MVFR possible. 

Saturday: VFR. Breezy. 

&&

.MARINE...
Forecaster Confidence Levels...

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

Today through Wednesday...High confidence.

Winds and seas remain below Small Craft Advisory criteria through 
Tuesday night. NW winds 10 to 15 kt today and tonight, with possible 
sea breeze development nearshore this afternoon. Seas 4 ft or less. 
Winds shift S Wednesday, increasing to 15 to 20 kt with gusts 25+ kt 
and seas building to 4 to 6 ft over southern waters. Small Craft 
Advisory conditions likely Wednesday into Thursday.

Outlook /Wednesday Night through Saturday/...

Wednesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas locally approaching 5 ft. Slight chance
of rain showers. 

Thursday: Winds less than 25 kt. Areas of seas approaching
5 ft. Rain showers, patchy fog. 

Thursday Night: Winds less than 25 kt. Areas of seas
approaching 5 ft. Rain showers, slight chance of thunderstorms,
patchy fog. 

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

Friday Night: Winds less than 25 kt. Seas up to 5 ft. Slight
chance of rain showers. 

Saturday: Winds less than 25 kt. Seas up to 5 ft. 

&&

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

&&

$$
Dooley

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