Lexington Weather

Current Conditions [‒] Current Conditions [+]

66.9°F Colder than last hour.

19.4°C

Muggy

Overcast

Overnight: Lo 62 °F

Thursday: Hi 80 °F

Dew Point: 63.5°F Decreased 0.7°F since last hour.

Humidity: 89%

Air Quality Index: 28

Good

(Ozone)

Barometer: 30.20 in S

1023 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 -
Overnight, Thursday, & Thursday Night through Wednesday

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Thu Sep 17, 2026 12:38am EDT

Overview:

- Muggy with seasonably warm temperatures today. Scattered showers arrive by the evening, continuing through Friday morning. Isolated moderate to heavy showers possible.

- Next chance for rain Sunday into Monday. There remains uncertainty in the details such as coverage, timing, amounts. Showers may linger through early next week.

Overnight:

Partly Cloudy

Lo 62 °F

Partly cloudy, with a low around 62. Southwest wind around 3 mph.

Thursday:

Partly Sunny then Slight Chance Rain Showers

Hi 80 °F

A slight chance of rain showers after 4pm. Partly sunny, with a high near 80. Southwest wind 1 to 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.

Thursday Night:

Patchy Fog

Lo 65 °F

A chance of rain showers before 9pm, then rain showers likely and patchy fog between 9pm and 11pm, then patchy fog and showers and thunderstorms likely between 11pm and 4am, then patchy fog and a slight chance of rain showers. Mostly cloudy, with a low around 65. Southwest wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

Friday:

Patchy Fog then Mostly Sunny

Hi 76 °F

Patchy fog before 7am. Mostly sunny, with a high near 76. Northwest wind 6 to 12 mph.

Friday Night:

Partly Cloudy

Lo 51 °F

Partly cloudy, with a low around 51. North wind 5 to 9 mph.

Saturday:

Mostly Sunny

Hi 65 °F

Mostly sunny, with a high near 65. Northeast wind around 5 mph.

Saturday Night:

Mostly Cloudy then Slight Chance Rain Showers

Lo 52 °F

A slight chance of rain showers after 4am. Mostly cloudy, with a low around 52. Southeast wind around 5 mph.

Sunday:

Rain Showers Likely

Hi 64 °F

Rain showers likely. Mostly cloudy, with a high near 64. South wind 3 to 7 mph. Chance of precipitation is 70%.

Sunday Night:

Rain Showers Likely

Lo 52 °F

Rain showers likely. Mostly cloudy, with a low around 52. Northeast wind around 6 mph. Chance of precipitation is 60%.

Monday:

Slight Chance Rain Showers

Hi 64 °F

A slight chance of rain showers. Mostly sunny, with a high near 64. Northeast wind around 8 mph.

Monday Night:

Chance Rain Showers

Lo 52 °F

A chance of rain showers. Mostly cloudy, with a low around 52. Northeast wind around 6 mph. Chance of precipitation is 40%.

Tuesday:

Chance Rain Showers

Hi 64 °F

A chance of rain showers. Partly sunny, with a high near 64. Northeast wind 6 to 9 mph. Chance of precipitation is 30%.

Tuesday Night:

Slight Chance Rain Showers

Lo 51 °F

A slight chance of rain showers. Partly cloudy, with a low around 51. Northeast wind 3 to 7 mph.

Wednesday:

Slight Chance Rain Showers

Hi 64 °F

A slight chance of rain showers. Mostly sunny, with a high near 64. Northeast wind 6 to 10 mph, with gusts as high as 21 mph.

FULL FORECAST

NWS Hourly Forecast -
Today 4am through Fri 3pm

Issued by:
National Weather Service Boston / Norton, MA
Updated Thu Sep 17, 2026 3:30am EDT

4:00am

Partly Cloudy

64°F
Dew Pt 62°F
Wind from W

W 2 mph
Precip: 0%

5:00am

Partly Cloudy

64°F
Dew Pt 62°F
Wind from W

W 2 mph
Precip: 0%

6:00am

Mostly Sunny

63°F
Dew Pt 62°F
Wind from W

W 1 mph
Precip: 0%

7:00am

Mostly Sunny

63°F
Dew Pt 62°F
Wind from SW

SW 1 mph
Precip: 1%

8:00am

Mostly Sunny

65°F
Dew Pt 63°F
Wind from W

W 2 mph
Precip: 1%

9:00am

Mostly Sunny

68°F
Dew Pt 64°F
Wind from S

S 2 mph
Precip: 1%

10:00am

Mostly Sunny

71°F
Dew Pt 65°F
Wind from SE

SE 2 mph
Precip: 1%

11:00am

Mostly Sunny

73°F
Dew Pt 65°F
Wind from S

S 3 mph
Precip: 1%

12:00pm

Partly Sunny

75°F
Dew Pt 66°F
Wind from S

S 3 mph
Precip: 2%

1:00pm

Mostly Cloudy

77°F
Dew Pt 66°F
Wind from S

S 5 mph
Precip: 3%

2:00pm

Mostly Cloudy

78°F
Dew Pt 67°F
Wind from S

S 5 mph
Precip: 6%

3:00pm

Mostly Cloudy

78°F
Dew Pt 67°F
Wind from S

S 5 mph
Precip: 9%

4:00pm

Slight Chance Rain Showers

77°F
Dew Pt 67°F
Wind from S

S 5 mph
Precip: 16%

5:00pm

Slight Chance Rain Showers

75°F
Dew Pt 67°F
Wind from S

S 5 mph
Precip: 22%

6:00pm

Chance Rain Showers

74°F
Dew Pt 68°F
Wind from S

S 5 mph
Precip: 29%

7:00pm

Chance Rain Showers

73°F
Dew Pt 67°F
Wind from S

S 5 mph
Precip: 36%

8:00pm

Chance Rain Showers

71°F
Dew Pt 67°F
Wind from S

S 5 mph
Precip: 43%
Rain: 0.02 in

9:00pm

Chance Rain Showers

70°F
Dew Pt 67°F
Wind from S

S 5 mph
Precip: 50%
Rain: 0.03 in

10:00pm

Rain Showers Likely

69°F
Dew Pt 67°F
Wind from S

S 5 mph
Precip: 57%
Rain: 0.03 in

11:00pm

Patchy Fog

69°F
Dew Pt 66°F
Wind from S

S 6 mph
Precip: 63%
Rain: 0.04 in

Fri
12:00am

Patchy Fog

68°F
Dew Pt 66°F
Wind from SW

SW 6 mph
Precip: 56%
Rain: 0.04 in

Fri
1:00am

Chance Rain Showers

68°F
Dew Pt 66°F
Wind from SW

SW 5 mph
Precip: 50%
Rain: 0.03 in

Fri
2:00am

Chance Rain Showers

68°F
Dew Pt 66°F
Wind from SW

SW 5 mph
Precip: 43%
Rain: 0.02 in

Fri
3:00am

Chance Rain Showers

67°F
Dew Pt 66°F
Wind from W

W 5 mph
Precip: 33%
Rain: 0.01 in

Fri
4:00am

Patchy Fog

67°F
Dew Pt 66°F
Wind from W

W 5 mph
Precip: 23%

Fri
5:00am

Patchy Fog

67°F
Dew Pt 66°F
Wind from W

W 5 mph
Precip: 13%

Fri
6:00am

Patchy Fog

65°F
Dew Pt 65°F
Wind from NW

NW 6 mph
Precip: 9%

Fri
7:00am

Partly Sunny

65°F
Dew Pt 64°F
Wind from NW

NW 7 mph
Precip: 6%

Fri
8:00am

Mostly Sunny

66°F
Dew Pt 64°F
Wind from NW

NW 8 mph
Precip: 2%

Fri
9:00am

Sunny

68°F
Dew Pt 63°F
Wind from NW

NW 8 mph
Precip: 1%

Fri
10:00am

Sunny

70°F
Dew Pt 61°F
Wind from N

N 9 mph
Precip: 1%

Fri
11:00am

Sunny

73°F
Dew Pt 58°F
Wind from N

N 10 mph
Precip: 1%

Fri
12:00pm

Sunny

74°F
Dew Pt 56°F
Wind from N

N 10 mph
Precip: 0%

Fri
1:00pm

Sunny

75°F
Dew Pt 55°F
Wind from NW

NW 12 mph
Precip: 0%

Fri
2:00pm

Mostly Sunny

76°F
Dew Pt 54°F
Wind from NW

NW 12 mph
Precip: 0%

Fri
3:00pm

Partly Sunny

76°F
Dew Pt 53°F
Wind from NW

NW 10 mph
Precip: 0%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 170740
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
340 AM EDT Thu Sep 17 2026

.WHAT HAS CHANGED...
No significant changes to the forecast.

&&

.KEY MESSAGES...

- Muggy with seasonably warm temperatures today. Scattered
  showers arrive by the evening, continuing through Friday 
  morning. Isolated moderate to heavy showers possible. 

- Next chance for rain Sunday into Monday. There remains
  uncertainty in the details such as coverage, timing, amounts.
  Showers may linger through early next week. 
  

&&

.DISCUSSION...
KEY MESSAGE 1...Muggy with seasonably warm temperatures today.
Scattered showers arrive by the evening, continuing through 
Friday morning. Isolated moderate to heavy showers possible. 

Today a shortwave trough approaches from the northwest increasing 
rain chances toward the evening. While much of the day stays mostly 
dry, a plume of anomalous moisture advects in resulting in plentiful 
moisture and humid/muggy day. PWAT values rise to around 2.0" which 
is fairly anomalous (180-200% of normal). Across most of the CAMs, 
showers begin to arrive after 2 PM in western MA/CT spreading 
eastward this evening while becoming higher in coverage. There 
continues to be variance in the exact track of this shortwave, 
particularly with how far north or south with respect to southern 
New England. This will likely influence rain amounts and how 
widespread the showers will be. A more north track will shift the 
stronger forcing to our north thus resulting in lighter rainfall 
amounts overall. The 00Z HRRR, RRFS, and NAM (to some extent) have 
lean more south favoring higher rain amounts with the support of 
stronger ascent and marginal instability for isolated downpours. The 
split continues to bring uncertainty in the expected totals and the 
potential for some isolated downpours this evening and tonight. 
Leverage the full range of guidance, most areas should see between 
0.1" to 0.6". However, pockets of higher amounts of up to 1.0" are 
possible within any embedded downpours. Mid-level flow should be 
strong enough to keep the showers moving which will reduce the flash 
flood threat. Additionally the latest HREF doesn't highlight any 
potential areas for potential to exceed 1hr and 3hr FFG.

Cold front moves through early Friday morning with winds shifting to 
the NW behind it. Showers ahead of the front push across the 
Cape/Islands, exiting by mid-morning. Breezy NW winds in the 
afternoon with gusts 20-25 mph, mainly across the interior.
Temperatures are likely to be in seasonable ranges in the 70s. A 
cooler than normal airmass settles across the region by Saturday 
bringing Fall-like temperatures in the 60s. Surface high pressure 
dominates bringing dry conditions. 


KEY MESSAGE 2...- Next chance for rain Sunday into Monday. There
remains uncertainty in the details such as coverage, timing, 
amounts. Showers may linger through early next week.

The main surface high exits offshore Saturday night into early 
Sunday as the next system approaches from the west with our next 
chance of precipitation. Shower/rain chances increase Sunday morning 
into Sunday afternoon from west to east. Plentiful moisture advects 
in within the southerly flow to support showers as the warm sector 
pushes northward into southern New England. PWATs increase to 1.0-
1.8" with the higher values across CT and RI. Soundings show deep 
moisture profiles further supporting efficient rainfall. Rain likely 
continues into early Monday morning. There is some question in if a 
frontal boundary stalls to the south which may result in lingering 
showers in areas Monday (south coast, Cape/Islands). 

The potential rain amounts will depend on the exact track of 
the system which is still variable across guidance this far out 
in time. This variance translates quite clearly to the rain 
totals across both deterministic and ensemble guidance. 
Ensembles range generally between 0.70 to upwards of 2.0". The 
GFS and Canadian ensembles have leaned on the lower end of that 
range(even lower than 0.70" in areas) compared to the ECMWF 
ensemble. On the other hand the AI- ECMWF ens and AI-GEFS have 
less than 0.60" QPF with similar solutions in the AI 
deterministic runs. A decent amount of spread still exists in 
how much rain will fall Sunday into Monday, but overall looks 
like a good shot for a soaking rain. Depending on if and where a
stationary boundary sets up nearby, showers may linger through 
the early part of the week. 

&&

.AVIATION /07Z THURSDAY THROUGH MONDAY/...
Forecaster Confidence Levels...

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

06Z TAF Update...

Through 12Z...Moderate confidence.

VFR outside of areas of patchy fog, where MVFR/IFR visibilities
are possible. Mid-level cigs for most of the region with the
exception of ACK. SSW winds near 4-8 kts. Patchy fog is 
possible in the valleys (BDL) and other prone areas ORH, BED. If
it does develop it will likely be between 08z and 12z, burning 
off quickly after sunrise.

Thursday...Moderate confidence.

VFR with areas of MVFR developing in the early afternoon/late
morning hours. SSW winds at 5-10 kts. Exception is BOS where a
sea breeze moves in 13-15Z out of the SE to ESE through late
afternoon. Showers arrive in the afternoon hours from W to E, 
with chances continuing to increase through the evening.
Showers are more likely to develop after 2 PM for the western
terminals and after 22Z for the more eastern terminals. 

Thursday Night...Moderate confidence.

MVFR with areas of IFR with patchy fog. Showers continue to
move across the region from west to east, exiting the
Cape/Islands around 12Z. SW winds 5-10 kts, shifting to NW
06-12Z as front moves through. 

KBOS Terminal...Moderate confidence in TAF.

Sea breeze develops 13-15Z with winds shifts SE then to ESE for
the afternoon. Winds shift back toward the S then SSW between
21-23Z. -SHRA more likely begin developing in the vicinity 
after 21Z. The highest chances for seeing -SHRA between 01-07Z.

KBDL Terminal...Moderate confidence in TAF.

Outlook /Friday through Monday/...

Friday through Friday Night: VFR. Breezy. 

Saturday through Saturday Night: VFR. 

Sunday: Mainly MVFR, with areas IFR possible. Breezy. SHRA.

Sunday Night: Mainly VFR, with local MVFR possible. Breezy.
Chance SHRA.

Monday: VFR. Breezy. Slight chance SHRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Thursday night...High confidence.

High pressure continues along with SW winds at 8-15 kts. Gusts
up to 22 kts are possible this evening into tonight, mainly for
the southern water and outer eastern waters. Patchy fog 
possible early this morning. A round of showers pushes across 
the waters tonight into Friday morning. Seas remain at 2-3 ft, 
though areas of the southern waters may approach 4 ft heading 
into Friday morning. Winds shift to the NW Friday morning with
some gusts up to 20 kts possible. 

Outlook /Friday through Monday/...

Friday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers. 

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

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

Saturday Night: Winds less than 25 kt. Seas locally approaching
5 ft. 

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

Sunday Night: Winds less than 25 kt. Local rough seas. Rain
showers likely, slight chance of thunderstorms. 

Monday: Low risk for Small Craft Advisory winds with gusts up
to 25 kt. Seas up to 5 ft. Chance of rain showers. 

&&

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

&&

$$

DISCUSSION...Mensch
AVIATION...Mensch
MARINE...Mensch

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