Lexington Weather

Current Conditions [‒] Current Conditions [+]

49.6°F Colder than last hour.

9.8°C

Chilly

Clear

Overnight: Lo 47 °F

Tuesday: Hi 68 °F

Dew Point: 45.3°F

Humidity: 85% Increased 3.0% since last hour.

Air Quality Index: 21

Good

(Fine Particles)

Barometer: 30.26 in Rising 0.03 inHg/hr

1025 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 Sep 15, 2026 2:53am EDT

Overview:

- Dry with cooler than normal temperatures today and tonight.

- Seasonably warm temperatures return mid-week, continuing through Friday. A few showers possible sometime late Thursday into early Friday, otherwise mainly dry.

- Potential for a shift to an unsettled pattern with chances for rain for second half of weekend through early next week.

Overnight:

Clear

Lo 47 °F

Clear, with a low around 47. North wind around 3 mph.

Tuesday:

Sunny

Hi 68 °F

Sunny, with a high near 68. Northeast wind around 6 mph.

Tuesday Night:

Partly Cloudy

Lo 52 °F

Partly cloudy, with a low around 52. South wind around 6 mph.

Wednesday:

Mostly Sunny

Hi 79 °F

Mostly sunny, with a high near 79. Southwest wind 3 to 7 mph.

Wednesday Night:

Partly Cloudy

Lo 61 °F

Partly cloudy, with a low around 61. Southwest wind around 5 mph.

Thursday:

Partly Sunny

Hi 79 °F

Partly sunny, with a high near 79. Southwest wind 2 to 6 mph.

Thursday Night:

Chance Showers And T-Storms

Lo 64 °F

Thursday Night: Chance Showers And Thunderstorms

A chance of rain showers between 8pm and 11pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Southwest wind around 7 mph. Chance of precipitation is 50%.

Friday:

Chance Showers And T-Storms then Mostly Sunny

Hi 78 °F

Friday: Chance Showers And Thunderstorms then Mostly Sunny

A chance of showers and thunderstorms before 8am. Mostly sunny, with a high near 78. Northwest wind around 9 mph. Chance of precipitation is 30%.

Friday Night:

Partly Cloudy

Lo 52 °F

Partly cloudy, with a low around 52. North wind around 7 mph.

Saturday:

Mostly Sunny

Hi 67 °F

Mostly sunny, with a high near 67. East wind around 6 mph.

Saturday Night:

Mostly Cloudy then Chance Rain Showers

Lo 55 °F

A chance of rain showers after 1am. Mostly cloudy, with a low around 55. Southeast wind around 6 mph. Chance of precipitation is 30%.

Sunday:

Rain Showers Likely

Hi 72 °F

Rain showers likely. Mostly cloudy, with a high near 72. Southwest wind 6 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

Sunday Night:

Rain Showers Likely

Lo 56 °F

Rain showers likely. Mostly cloudy, with a low around 56. Northwest wind around 9 mph. Chance of precipitation is 60%.

Monday:

Chance Rain Showers

Hi 69 °F

A chance of rain showers. Mostly cloudy, with a high near 69. Northeast wind around 8 mph.

FULL FORECAST

NWS Hourly Forecast -
Today 4am through Wed 3pm

Issued by:
National Weather Service Boston / Norton, MA
Updated Tue Sep 15, 2026 2:53am EDT

4:00am

Clear

49°F
Dew Pt 45°F
Wind Chill: 48°F
Wind from N

N 3 mph
Precip: 0%

5:00am

Clear

48°F
Dew Pt 45°F
Wind Chill: 47°F
Wind from N

N 3 mph
Precip: 0%

6:00am

Sunny

48°F
Dew Pt 45°F
Wind Chill: 47°F
Wind from N

N 3 mph
Precip: 0%

7:00am

Sunny

48°F
Dew Pt 45°F
Wind Chill: 47°F
Wind from N

N 3 mph
Precip: 0%

8:00am

Sunny

51°F
Dew Pt 47°F
Wind from N

N 3 mph
Precip: 0%

9:00am

Sunny

55°F
Dew Pt 48°F
Wind from N

N 3 mph
Precip: 0%

10:00am

Sunny

60°F
Dew Pt 49°F
Wind from NE

NE 5 mph
Precip: 0%

11:00am

Sunny

63°F
Dew Pt 49°F
Wind from E

E 5 mph
Precip: 0%

12:00pm

Sunny

65°F
Dew Pt 49°F
Wind from E

E 5 mph
Precip: 0%

1:00pm

Sunny

66°F
Dew Pt 50°F
Wind from E

E 5 mph
Precip: 0%

2:00pm

Sunny

67°F
Dew Pt 50°F
Wind from SE

SE 5 mph
Precip: 0%

3:00pm

Sunny

67°F
Dew Pt 50°F
Wind from SE

SE 5 mph
Precip: 0%

4:00pm

Sunny

67°F
Dew Pt 51°F
Wind from SE

SE 5 mph
Precip: 0%

5:00pm

Sunny

65°F
Dew Pt 51°F
Wind from SE

SE 6 mph
Precip: 0%

6:00pm

Mostly Clear

64°F
Dew Pt 51°F
Wind from SE

SE 6 mph
Precip: 0%

7:00pm

Mostly Clear

62°F
Dew Pt 51°F
Wind from SE

SE 5 mph
Precip: 0%

8:00pm

Mostly Clear

59°F
Dew Pt 51°F
Wind from SE

SE 5 mph
Precip: 0%

9:00pm

Mostly Clear

58°F
Dew Pt 51°F
Wind from SE

SE 5 mph
Precip: 0%

10:00pm

Mostly Clear

56°F
Dew Pt 51°F
Wind from S

S 5 mph
Precip: 1%

11:00pm

Mostly Clear

56°F
Dew Pt 51°F
Wind from S

S 3 mph
Precip: 1%

Wed
12:00am

Mostly Clear

55°F
Dew Pt 51°F
Wind from S

S 3 mph
Precip: 1%

Wed
1:00am

Mostly Clear

55°F
Dew Pt 51°F
Wind from S

S 3 mph
Precip: 1%

Wed
2:00am

Partly Cloudy

54°F
Dew Pt 51°F
Wind from S

S 3 mph
Precip: 1%

Wed
3:00am

Partly Cloudy

53°F
Dew Pt 51°F
Wind from S

S 3 mph
Precip: 1%

Wed
4:00am

Partly Cloudy

53°F
Dew Pt 51°F
Wind from S

S 3 mph
Precip: 1%

Wed
5:00am

Partly Cloudy

53°F
Dew Pt 51°F
Wind from SW

SW 3 mph
Precip: 1%

Wed
6:00am

Mostly Sunny

52°F
Dew Pt 51°F
Wind from SW

SW 3 mph
Precip: 2%

Wed
7:00am

Mostly Sunny

53°F
Dew Pt 51°F
Wind from SW

SW 5 mph
Precip: 1%

Wed
8:00am

Mostly Sunny

56°F
Dew Pt 53°F
Wind from SW

SW 5 mph
Precip: 0%

Wed
9:00am

Mostly Sunny

61°F
Dew Pt 55°F
Wind from SW

SW 6 mph
Precip: 0%

Wed
10:00am

Mostly Sunny

66°F
Dew Pt 57°F
Wind from SW

SW 6 mph
Precip: 0%

Wed
11:00am

Mostly Sunny

69°F
Dew Pt 57°F
Wind from SW

SW 7 mph
Precip: 0%

Wed
12:00pm

Mostly Sunny

72°F
Dew Pt 58°F
Wind from SW

SW 7 mph
Precip: 0%

Wed
1:00pm

Partly Sunny

74°F
Dew Pt 59°F
Wind from SW

SW 7 mph
Precip: 0%

Wed
2:00pm

Partly Sunny

76°F
Dew Pt 60°F
Wind from SW

SW 7 mph
Precip: 0%

Wed
3:00pm

Partly Sunny

77°F
Dew Pt 60°F
Wind from SW

SW 7 mph
Precip: 0%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 150703
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
303 AM EDT Tue Sep 15 2026

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

&&

.KEY MESSAGES...

- Dry with cooler than normal temperatures today and tonight. 

- Seasonably warm temperatures return mid-week, continuing
  through Friday. A few showers possible sometime late Thursday
  into early Friday, otherwise mainly dry. 

- Potential for a shift to an unsettled pattern with chances 
  for rain for second half of weekend through early next week. 

&&

.DISCUSSION...
KEY MESSAGE 1...Dry with cooler than normal temperatures today
and tonight. 

Surface high pressure will be positioned the region today 
bringing dry conditions and mainly sunny skies. A cooler airmass
will be in place with 925mb temperatures several degrees cooler
than Monday. This will yield more "Fall-like" temperatures with
high temperatures in the upper 60s and low 70s. Locations along
the immediate east coast may even be cooler in the mid 60s as a 
result of the light easterly onshore flow. The high pressure 
center shifts offshore tonight shifting winds to the S then SW.

KEY MESSAGE 2...Seasonably warm temperatures return mid-week, 
continuing through Friday. A few showers possible sometime late 
Thursday into early Friday, otherwise mainly dry. 

A strong upper level ridge/high remains positioned across the 
southeast CONUS mid-week, subtly building into the northeast mid-
week. An upper trough in northern Canada will hold off any stronger 
ridging from building into the northeast, favoring a flatter/zonal 
pattern overall. This should support warmer temperatures advecting 
in within the SW flow. Highs Wednesday/Thursday rise back into the 
mid and upper 70s with 80s in the valleys (seasonably warm for mid-
Sept). Surface high pressure should support mainly dry conditions 
Wednesday and Thursday. 

Ensemble/deterministic guidance indicates potential for a weak 
shortwave trough to drop in from the northwest late Thursday into 
Friday. Ahead of this shortwave, a plume of anomalous moisture 
advects in from the west on Thursday. Across ensemble guidance,
the PWATs run around 170-200 percent of normal or more directly
put, PWATs 1.7-1.9". The anomalous moisture is being signal 
across NAEFS guidance as well. This building moisture will bring
a more humid day for Thursday. There is some spread across 
guidance with regards to the timing of the showers; however, 
there is general agreement of the highest chances falling in the
late Thu afternoon to early Fri morning timeframe. That 
timeframe should be able to be narrowed down as the details of 
the pattern become more clear as we go through the week. Despite
the anomalous moisture, the weaker lift with this wave and 
later timing has limited the potential for widespread heavy 
rain. Ensemble QPF remains below 0.50" for most areas. We'll 
have to keep an eye on some embedded heavier showers that could 
bring locally higher amounts. A drier airmass pushes in behind 
the exiting shortwave Friday bringing dry conditions dominating 
by the afternoon. A cooler airmass sinks across the region by 
Saturday bring a return of Fall-like temperatures. 

KEY MESSAGE 3...Potential for a shift to an unsettled pattern
with chances or rain for second half of weekend through early 
next week.

Ensemble guidance hints at a transition to a more unsettled pattern 
for the second half of the weekend and into early next week. A low 
pressure system tracks eastward from the Great Lakes bringing 
increased precipitation chances more likely in the Sun-Mon 
timeframe. There indications of another wave or two bringing 
periods of rain for early next week as well. Confidence in 
precipitation chances and timing should increase as we get 
closer. 

&&

.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...

Through 12Z...High confidence.

VFR. Light N/NNE winds. Occasional gusts to 18 kts possible for
Cape terminals through 08Z (HYA/ACK).  

Tuesday...High confidence.

VFR. NNE winds this morning shifting to the NE at 5-10 kts. Interior
terminals shift likely shift to the S/SSE early afternoon while
coastal terminals shift to E/ESE in the afternoon then shift to
the S/SSE 00-03Z. 

Tuesday night...High confidence.

VFR. Winds becoming light S to SW. Patchy fog possible in
valleys. 

KBOS Terminal...High confidence in TAF. NNE winds shift to NE
this morning then shift E/ESE 16-18Z at 5-10 kts. Winds shift
toward the SSE/S around 00Z becoming S/SSW by 03Z.  

KBDL Terminal...High confidence in TAF.

Outlook /Wednesday through Saturday/...

Wednesday through Wednesday Night: VFR. 

Thursday: Mainly VFR, with local MVFR possible. 

Thursday Night: Mainly VFR, with local MVFR possible. Chance
SHRA, slight chance TSRA.

Friday: VFR. 

Friday Night: VFR. Breezy. 

Saturday: VFR. 

&&

.MARINE...
Forecaster Confidence Levels...

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

High pressure overhead today bringing light easterly winds today
and tonight. Winds shift around to the S/SW overnight tonight
into Wednesday as the high pressure center shifts offshore. 

Outlook /Wednesday through Saturday/...

Wednesday through Thursday: Winds less than 25 kt. 

Thursday Night: Winds less than 25 kt. Chance of rain showers. 

Friday: Winds less than 25 kt. Slight chance of rain showers. 

Friday Night through Saturday: Winds less than 25 kt. 

&&

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

&&

$$

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

CLOSE

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Precipitation [‒] Precipitation [+]

Note: Rain measured automatically by weather station. Rain totals do not necessarily include melted frozen precipitation.

For more accurate, manually measured rain data, see the Local Precip Data page.

0.00 in

Rain Rate (/hr):

0.00 in

Rain Last 60 min:

0.00 in

Rain Today:

0.01 in

Monday:

1.94 in

September:

21.84 in

2026

Daily Extremes [‒] Daily Extremes [+]

12:00am

55.8°F

High today:

4:08am

49.6°F

Low today:

2:50pm

71.2°F

High Monday:

11:59pm

55.8°F

Low Monday:

4:08am

49.6°F

Low wind chill today:

12:00am

47.3°F

High dew pt today:

12:00am

66.0°F

High dew pt Monday:

None

Wind gust today:

9:54am

8 mph

Wind gust Monday:

MORE EXTREMES

Alerts / Advisories [‒] Alerts / Advisories [+]

No alerts/warnings active for Southeast Middlesex County.

Sun / Moon [‒] Sun / Moon [+]

First Light:

5:57am

Sunrise:

6:25am

Sunset:

6:55pm

Twilight ends:

7:23pm

Daylight length:

12 hours 30 minutes

Waxing Crescent, Moon age: 4 days, 4 hours, 49 minutes, 19%

Phase:

Waxing Crescent (19%)

Moon rise:

11:25am

Moon set:

8:44pm

Lexington Weather

Current Conditions [‒] Current Conditions [+]

OTHER PERSONAL WEATHER STATIONS

REGIONAL CONDITIONS

Forecast [‒] Forecast [+]

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

Overview:

Overnight:

Tuesday:

Tuesday Night:

Wednesday:

Wednesday Night:

Thursday:

Thursday Night:

Friday:

Friday Night:

Saturday:

Saturday Night:

Sunday:

Sunday Night:

Monday:

FULL FORECAST

NWS Hourly Forecast -
Today 4am through Wed 3pm

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

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

Overview:

Overnight:

Tuesday:

Tuesday Night:

Wednesday:

Wednesday Night:

Thursday:

Thursday Night:

Friday:

Friday Night:

Saturday:

Saturday Night:

Sunday:

Sunday Night:

Monday:

NWS Hourly Forecast - Today 4am through Wed 3pm

Area Forecast Discussion for Boston / Norton, MA

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Satellite [‒] Satellite [+]

Precipitation [‒] Precipitation [+]

Daily Extremes [‒] Daily Extremes [+]

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

NWS Hourly Forecast -
Today 4am through Wed 3pm

Area Forecast Discussion
for Boston / Norton, MA