Lexington Weather

Current Conditions [‒] Current Conditions [+]

50.7°F Warmer than last hour.

10.4°C

Cool

Clear

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: 32

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, cooling down Friday before the weekend's warm-up.

- Dry with well above normal temperatures Saturday through the middle of next week.

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 3pm through Fri 2am

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

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

Fri
1:00am

Showers And Thunderstorms

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

NE 5 mph
Precip: 80%
Rain: 0.05 in

Fri
2:00am

Rain Showers Likely

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

NE 5 mph
Precip: 70%
Rain: 0.03 in

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 131829
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
229 PM EDT Wed May 13 2026

.WHAT HAS CHANGED...

No signficant changes. 

&&

.KEY MESSAGES...

- Widespread rainfall Thu into Fri, cooling down Friday before
  the weekend's warm-up. 

- Dry with well above normal temperatures Saturday through the 
  middle of next week.

&&

.DISCUSSION...

KEY MESSAGE 1...Widespread rainfall Thu into Fri, cooling down 
Friday before the weekend's warm-up. 

Southern New England is situated between high pressure over the 
western Atlantic and a 1004mb low pressure center over the great 
Lakes. The warm front extending from that low is making its way 
north through New England this afternoon and led to light showers 
out ahead earlier this afternoon. These have cleared and we expect 
that to remain the case the rest of the day as some marginally drier 
air moves in in the 850-600mb layer and a lack of much forcing 
behind the front. Otherwise, breezy conditions the rest of the day 
as the well mixed BL taps into a 35-40 kt 850mb jet overhead. 

As the upper level low digs into the southeast it sets us up for a 
cool and wet Thursday (lingering into Friday thanks to the 
amplified, slowly evolving pattern). This places SNE beneath a plume 
of anomolous moisture (PWATs over 1" are in the 99th percentile of 
climatology). Together with strong synoptic forcing from strong PVA, 
favorable placement beneath a 300mb jet, and convergence in the mid 
levels most locations in the region can expect 1 to 2 inches of rain 
before all is said and done. Rain arrives in western SNE Thursday 
morning, overspreading the region through the day and ending in the 
early overnight hours. There may be two bullseyes of highest rain 
totals, one over the western MA/CT high terrain thanks to upslope 
flow, and another over eastern MA associated with a secondary
low that looks to form between the parent low to our NW and  
another disturbance passing by over the Atlantic. Fortunately, 
given the prolonged nature of the rain, not expecting flooding 
to be a concern. Finally, dewpoints may reach the low to mid 50s
Thursday afternoon contributing to several hundred J/kg of 
elevated CAPE, so may have some embedded thunderstorms as well. 

Friday will be drier as the surface low slowly moves east but the 
upper low lingers overhead. This turns winds out of the northeast 
while low level moisture remains locked in. So, expect a cool, 
cloudy, day with off and on light rain/drizzle; more likely to 
remain dry the further west you go. The upper level airmass doesn't 
change much, so expecting high temperatures for the western half of 
the region to be similar to Thursday, in the upper 50s (high 
elevation) to low 60s (CT Valley). The difference will be felt in 
eastern MA and RI where that onshore flow will drop high 
temperatures from the low/mid 60s Thursday to the upper 50s on 
Friday. This is approaching 10 degrees cooler than normal. 

KEY MESSAGE 2...Dry with well above normal temperatures 
Saturday through the middle of next week.

A persistent ridge sets up over the east CONUS on Saturday and 
remains quasi-stationary through the middle of next week. This will 
support a persistent area of high pressure off the southeast that 
will advect warm, moist air into southern New England for 
several days. Expect several consecutive days with high 
temperatures in the 70s for much of southern New England, with 
low to mid 80s possible on Tuesday and Wednesday. Low temps 
forecast to be mainly in the 50s during this stretch. Overall a 
warm,dry, and quiet stretch of weather between Saturday and the 
middle of 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:

This afternoon...High confidence.

VFR. S/SSW winds 10-20 kts with gusts up to 30 kt possible at 
times. 

Tonight...High confidence. 

VFR cigs to start then becoming MVFR/IFR after 06z 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. 

Thursday night...High confidence. 

IFR/LIFR cigs. Widespread moderate to heavy rain ends but light
rain/drizzle continues. Winds light NE. 


KBOS...High confidence.

KBDL...High confidence.

Outlook /Friday through Monday/...

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

Friday Night: VFR. 

Saturday through Sunday: VFR. Breezy. 

Sunday Night through Monday: VFR. 

&&

.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 /Friday through Monday/...

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 through Monday: 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 until 11 PM EDT this evening for 
     ANZ230>237-250-251-254>256.

&&

$$

DISCUSSION...BW/RM
AVIATION...BW/RM
MARINE...BW

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