Lexington Weather

Current Conditions [‒] Current Conditions [+]

50.7°F Warmer than last hour.

10.4°C

Cool

Light rain, Overcast

Today: Hi 65 °F

Tonight: Lo 51 °F

Dew Point: 44.4°F Increased 0.5°F since last hour .

Humidity: 79% Decreased 3.0% since last hour.

Air Quality Index: 29

Good

(Ozone)

Barometer: 30.00 in S

1016 mb

Rain Rate: 0.00 in/hr

Rain Today: 0.00 in

Rain Tuesday: 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, & Thursday through Tuesday Night

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Wed May 13, 2026 5:28am EDT

Overview:

- Widespread rainfall Thu into Fri, with 1-2\" possible in spots.

- Cool weather Friday, gives way to a pattern change this weekend into next week, accompanied by unseasonable warmth.

Today:

Chance Rain Showers

Hi 65 °F

A chance of rain showers between 8am and 2pm. Mostly cloudy, with a high near 65. South wind 2 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

Tonight:

Mostly Cloudy then Slight Chance Rain Showers

Lo 51 °F

A slight chance of rain showers after 5am. Mostly cloudy, with a low around 51. South wind 7 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.

Thursday:

Rain Showers

Hi 63 °F

Rain showers before 2pm, then showers and thunderstorms. Mostly cloudy. High near 63, with temperatures falling to around 57 in the afternoon. Southeast wind 7 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Thursday Night:

Showers And T-Storms

Lo 47 °F

Thursday Night: Showers And Thunderstorms

Showers and thunderstorms before 7pm, then patchy fog and showers and thunderstorms. Cloudy, with a low around 47. Northeast wind around 7 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Friday:

Rain Showers Likely

Hi 56 °F

Rain showers likely. Mostly cloudy, with a high near 56. Northeast wind around 8 mph. Chance of precipitation is 70%.

Friday Night:

Partly Cloudy

Lo 48 °F

Partly cloudy, with a low around 48. Northwest wind around 6 mph.

Saturday:

Sunny

Hi 76 °F

Sunny, with a high near 76. Southwest wind 5 to 10 mph.

Saturday Night:

Mostly Clear

Lo 57 °F

Mostly clear, with a low around 57. Southwest wind 7 to 10 mph.

Sunday:

Sunny

Hi 82 °F

Sunny, with a high near 82. West wind 7 to 10 mph.

Sunday Night:

Partly Cloudy

Lo 56 °F

Partly cloudy, with a low around 56. Northwest wind 3 to 9 mph.

Monday:

Mostly Sunny

Hi 77 °F

Mostly sunny, with a high near 77. East wind 3 to 8 mph.

Monday Night:

Partly Cloudy then Slight Chance Rain Showers

Lo 56 °F

A slight chance of rain showers after 5am. Partly cloudy, with a low around 56. South wind 3 to 8 mph.

Tuesday:

Mostly Sunny

Hi 86 °F

Mostly sunny, with a high near 86. Southwest wind 5 to 10 mph.

Tuesday Night:

Slight Chance Rain Showers

Lo 61 °F

A slight chance of rain showers after 8pm. Partly cloudy, with a low around 61. Southwest wind 7 to 10 mph.

FULL FORECAST

NWS Hourly Forecast -
Today 1pm through Fri 12am

Issued by:
National Weather Service Boston / Norton, MA
Updated Wed May 13, 2026 5:28am EDT

1:00pm

Slight Chance Rain Showers

60°F
Dew Pt 43°F
Wind from S

S 12 mph
Precip: 18%

2:00pm

Cloudy

62°F
Dew Pt 43°F
Wind from S

S 13 mph
Precip: 12%

3:00pm

Mostly Cloudy

63°F
Dew Pt 43°F
Wind from S

S 14 mph
Precip: 8%

4:00pm

Mostly Cloudy

63°F
Dew Pt 42°F
Wind from S

S 14 mph
Precip: 7%

5:00pm

Mostly Cloudy

63°F
Dew Pt 42°F
Wind from S

S 14 mph
Precip: 7%

6:00pm

Mostly Cloudy

64°F
Dew Pt 42°F
Wind from S

S 14 mph
Precip: 9%

7:00pm

Mostly Cloudy

62°F
Dew Pt 42°F
Wind from S

S 14 mph
Precip: 11%

8:00pm

Mostly Cloudy

60°F
Dew Pt 42°F
Wind from S

S 13 mph
Precip: 7%

9:00pm

Mostly Cloudy

57°F
Dew Pt 43°F
Wind from S

S 12 mph
Precip: 6%

10:00pm

Mostly Cloudy

56°F
Dew Pt 43°F
Wind from S

S 12 mph
Precip: 5%

11:00pm

Mostly Cloudy

55°F
Dew Pt 44°F
Wind from S

S 10 mph
Precip: 4%

Thu
12:00am

Mostly Cloudy

55°F
Dew Pt 45°F
Wind from S

S 9 mph
Precip: 4%

Thu
1:00am

Mostly Cloudy

55°F
Dew Pt 45°F
Wind from S

S 8 mph
Precip: 4%

Thu
2:00am

Mostly Cloudy

54°F
Dew Pt 46°F
Wind from S

S 7 mph
Precip: 8%

Thu
3:00am

Mostly Cloudy

54°F
Dew Pt 47°F
Wind from S

S 7 mph
Precip: 10%

Thu
4:00am

Mostly Cloudy

53°F
Dew Pt 47°F
Wind from S

S 7 mph
Precip: 14%

Thu
5:00am

Slight Chance Rain Showers

53°F
Dew Pt 48°F
Wind from SE

SE 7 mph
Precip: 19%

Thu
6:00am

Slight Chance Rain Showers

53°F
Dew Pt 48°F
Wind from SE

SE 7 mph
Precip: 20%

Thu
7:00am

Slight Chance Rain Showers

52°F
Dew Pt 49°F
Wind from SE

SE 7 mph
Precip: 21%

Thu
8:00am

Chance Rain Showers

54°F
Dew Pt 50°F
Wind from SE

SE 8 mph
Precip: 34%
Rain: 0.01 in

Thu
9:00am

Chance Rain Showers

56°F
Dew Pt 50°F
Wind from SE

SE 8 mph
Precip: 41%
Rain: 0.01 in

Thu
10:00am

Rain Showers Likely

58°F
Dew Pt 51°F
Wind from SE

SE 9 mph
Precip: 60%
Rain: 0.03 in

Thu
11:00am

Rain Showers Likely

59°F
Dew Pt 52°F
Wind from E

E 9 mph
Precip: 69%
Rain: 0.03 in

Thu
12:00pm

Rain Showers

60°F
Dew Pt 52°F
Wind from E

E 10 mph
Precip: 75%
Rain: 0.03 in

Thu
1:00pm

Rain Showers Likely

60°F
Dew Pt 53°F
Wind from E

E 10 mph
Precip: 70%
Rain: 0.03 in

Thu
2:00pm

Showers And Thunderstorms

59°F
Dew Pt 53°F
Wind from E

E 9 mph
Precip: 85%
Rain: 0.04 in

Thu
3:00pm

Showers And Thunderstorms

61°F
Dew Pt 52°F
Wind from E

E 9 mph
Precip: 88%
Rain: 0.04 in

Thu
4:00pm

Showers And Thunderstorms

58°F
Dew Pt 52°F
Wind from E

E 9 mph
Precip: 91%
Rain: 0.04 in

Thu
5:00pm

Showers And Thunderstorms

57°F
Dew Pt 52°F
Wind from E

E 8 mph
Precip: 88%
Rain: 0.04 in

Thu
6:00pm

Showers And Thunderstorms

57°F
Dew Pt 52°F
Wind from E

E 7 mph
Precip: 85%
Rain: 0.04 in

Thu
7:00pm

Patchy Fog

54°F
Dew Pt 51°F
Wind from E

E 7 mph
Precip: 78%
Rain: 0.04 in

Thu
8:00pm

Patchy Fog

53°F
Dew Pt 50°F
Wind from E

E 7 mph
Precip: 67%
Rain: 0.04 in

Thu
9:00pm

Showers And Thunderstorms Likely

52°F
Dew Pt 50°F
Wind from E

E 6 mph
Precip: 73%
Rain: 0.04 in

Thu
10:00pm

Showers And Thunderstorms

51°F
Dew Pt 50°F
Wind from E

E 5 mph
Precip: 78%
Rain: 0.05 in

Thu
11:00pm

Showers And Thunderstorms

50°F
Dew Pt 49°F
Wind Chill: 48°F
Wind from NE

NE 5 mph
Precip: 84%
Rain: 0.05 in

Fri
12:00am

Showers And Thunderstorms

50°F
Dew Pt 49°F
Wind Chill: 48°F
Wind from NE

NE 5 mph
Precip: 82%
Rain: 0.05 in

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 131149
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
749 AM EDT Wed May 13 2026

.WHAT HAS CHANGED...
Increased probability for 1-2" of rainfall possible Thu into
Fri.

&&

.KEY MESSAGES...

- Widespread rainfall Thu into Fri, with 1-2" possible in spots.

- Cool weather Friday, gives way to a pattern change this
  weekend into next week, accompanied by unseasonable warmth.

&&

.DISCUSSION...
KEY MESSAGE 1...Appreciable rainfall Thursday, lingering into Fri.

High amplitude pattern Thu and Fri, yields roughly a 48 hr period of 
wet weather. This high amplitude pattern contributes to a slower 
arrival time of the rainfall, with much of this afternoon and 
evening dry across MA/RI/CT. Just expecting some warm frontal 
showers this morning and mainly confined to CT and northern MA. It 
will become breezy this afternoon and continuing into early this 
evening, with south winds gusting up to 20-30 mph at times. Cloud 
cover and southerly winds off the cool ocean will cap highs this 
afternoon to the low to mid 60s, about 5 degs cooler than normal. 

Potent short wave streaming across the Great Lakes Tue night, digs 
southeast and evolves into a high amplitude vertically closed cool 
season low Thu, that slowly tracks just south of New England Fri. 
This yields deep layer Atlantic moisture advection into SNE, with 
PWATs greater than 1 inch Thu and Thu evening, along with strong 
synoptic scale forcing for ascent. This will result in widespread 
rain Thu and Thu night, then transitioning to lighter rain/drizzle 
Fri, as dry slot overspreads the region. Rain will be moderate to 
heavy at times, given strength and persistence of low level S-SE jet 
(possible upslope enhancement), combined with some elevated 
instability. Widespread rainfall of 0.5-1.0 inches, however up to 2 
inches possible per hi res guid, ensembles and AI models. However, 
given rainfall will be spread out over 2 days, not expecting any 
flooding, more of a beneficial rainfall, with typical nuisance 
street/highway flooding possible. 

KEY MESSAGE 2...Cool weather Friday, gives way to a pattern change 
this weekend into next week, accompanied by unseasonable warmth.

Departing vertically closed low and associated cloud cover, spotty 
light rain/drizzle (especially Fri AM) and cool NE flow (only +6C at 
925 mb), likely keeps highs in the 50s across the area Fri, with 
coolest temps in eastern MA. Normal high this time of year is 65-70. 
Then over the weekend and into next week, a pattern change evolves 
with the northern stream jet deamplifying and giving way to the 
subtropical ridge emerging and building up along the east coast.

Ensembles indicate high probabilities for temps well into the 
mid/upper 70s Saturday and continuing to warm into the low and mid 
80s Sunday! Possibly not quite as warm Monday, especially in eastern 
MA, if a backdoor cold front makes it this far south. Otherwise, the 
unseasonably warm weather continues early next week and likely peaks 
Tue, with highs possibly as warm as 85-90, as some guidance streams 
+23C/+24C airmass at 925 mb across SNE! It will be relatively dry 
airmass/low humidity, with dew pts in the 50s, possibly rising into 
the low 60s briefly Tue.

&&

.AVIATION /12Z WEDNESDAY THROUGH SUNDAY/...
Forecaster Confidence Levels...

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

12Z TAF Update:

Today...High confidence.

VFR. Light rain showers possible through 16z. Otherwise dry 
weather prevails. Light S/SSE winds this morning at 6-12 kts 
becoming S/SSW this afternoon at 10-20 kts with gusts up to 30 
kt possible at times. 

Tonight...high confidence. 

VFR ceilings to start then becoming MVFR/IFR after 04z from 
west to east. Few showers are possible in west/central southern
new england after 06Z. As surface winds slacken after 00Z, 
marginal LLWS possible given modest low level SW jet of 35-40 
kt.

Thursday...high confidence on trends but some uncertainty on exact 
timing of details. 

MVFR/IFR with periods of rain, moderate to heavy at times. 20-25% 
probability of -TSRA in embedded heavier showers. ESE winds at
8-12 kts with a occasional gust up to 20 kts. 


KBOS...High confidence.

KBDL...High confidence.

Outlook /Thursday Night through Sunday/...

Thursday Night: MVFR/IFR conditions possible. SHRA likely,
slight chance TSRA.

Friday: Mainly VFR, with areas IFR possible. SHRA likely.

Friday Night: VFR. 

Saturday through Sunday: VFR. Breezy. 

&&

.MARINE...
Forecaster Confidence Levels...

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

2 AM update...

Today through Thursday...High confidence.

Strengthening low level SW jet moves across SNE today, with light SW 
early this morning, becoming south and increasing to 20-25 kt this 
afternoon, except 25-30 kt in gusts near shore. Hence, SCA remains 
posted. Other than a spot morning shower across northern MA waters, 
dry weather and good vsby prevail today. South winds slacken tonight 
with mainly dry weather. Rough conditions Thu, with S-SE winds 20-25 
kt in the morning, then slacken in the afternoon and become east as 
low pressure tracks south of New England. This low will bring 
widespread rain to region Thu, moderate to heavy at times with 
reduced vsby.

Outlook /Thursday Night through Sunday/...

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

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. 

Saturday: Low risk for Small Craft Advisory winds with gusts up
to 25 kt. Seas up to 5 ft. 

Saturday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Areas of seas approaching 5 ft. 

Sunday: Winds less than 25 kt. Areas of seas approaching 5 ft. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory from 11 AM this morning to 11 PM EDT this 
     evening for ANZ230>237-250-251-254>256.

&&

$$

DISCUSSION...Nocera
AVIATION...Mensch/Nocera
MARINE...Nocera

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