Lexington Weather

Current Conditions [‒] Current Conditions [+]

82.0°F Colder than last hour.

27.8°C

Feels like 85.5°F

Hot

Partly cloudy

This Afternoon: Hi 89 °F

Tonight: Lo 69 °F

Dew Point: 69.1°F Increased 0.7°F since last hour .

Humidity: 65% Increased 3.0% since last hour.

Air Quality Index: 55

Moderate

(Fine Particles)

Barometer: 30.00 in S

1016 mb

Rain Rate: 0.00 in/hr

Rain Today: 0.00 in

Rain Sunday: 0.00 in

Visibility: 10 miles

Wind:

Now: Calm

Avg: Calm

Gusts: 4 mph

OTHER PERSONAL WEATHER STATIONS

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

Southeast Middlesex County, MA - Heat Advisory
- SEE ALL NEARBY ALERTS -

NWS Weather Forecast -
This Afternoon, Tonight, & Tuesday through Sunday Night

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Mon Jul 13, 2026 3:37pm EDT

Overview:

- High heat and humidity return Tuesday and Wednesday. Heat Advisories in effect Tuesday morning through Wednesday morning. Gusty southwest winds Tuesday and Tuesday night.

- Periods of unsettled weather possible later this week.

Heat Advisory

This Afternoon:

Mostly Sunny

Hi 89 °F

Mostly sunny, with a high near 89. Southwest wind around 10 mph.

Tonight:

Partly Cloudy

Lo 69 °F

Partly cloudy, with a low around 69. Southwest wind around 12 mph.

Tuesday:

Mostly Sunny

Hi 97 °F

Mostly sunny, with a high near 97. Heat index values as high as 103. West wind 8 to 14 mph, with gusts as high as 29 mph.

Tuesday Night:

Mostly Clear

Lo 78 °F

Mostly clear, with a low around 78. Heat index values as high as 101. West wind 8 to 14 mph, with gusts as high as 29 mph.

Wednesday:

Mostly Sunny

Hi 94 °F

Mostly sunny, with a high near 94. Northwest wind 8 to 12 mph, with gusts as high as 22 mph.

Wednesday Night:

Mostly Clear

Lo 69 °F

Mostly clear, with a low around 69. West wind 3 to 9 mph.

Thursday:

Sunny

Hi 92 °F

Sunny, with a high near 92. West wind 5 to 13 mph, with gusts as high as 24 mph.

Thursday Night:

Mostly Clear

Lo 67 °F

Mostly clear, with a low around 67. West wind 5 to 12 mph, with gusts as high as 22 mph.

Friday:

Sunny

Hi 88 °F

Sunny, with a high near 88. Northwest wind 6 to 9 mph.

Friday Night:

Mostly Clear then Slight Chance Rain Showers

Lo 65 °F

A slight chance of rain showers after 5am. Mostly clear, with a low around 65. Northwest wind 3 to 7 mph.

Saturday:

Chance Showers And T-Storms

Hi 86 °F

Saturday: Chance Showers And Thunderstorms

A slight chance of rain showers before 2pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 86. West wind 3 to 7 mph. Chance of precipitation is 40%.

Saturday Night:

Chance Showers And T-Storms

Lo 66 °F

Saturday Night: Chance Showers And Thunderstorms

A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Southwest wind around 6 mph. Chance of precipitation is 50%.

Sunday:

Chance Rain Showers then Chance Showers And T-Storms

Hi 82 °F

Sunday: Chance Rain Showers then Chance Showers And Thunderstorms

A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 82. North wind around 7 mph. Chance of precipitation is 40%.

Sunday Night:

Chance Showers And T-Storms

Lo 64 °F

Sunday Night: Chance Showers And Thunderstorms

A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Southwest wind around 6 mph.

FULL FORECAST

NWS Hourly Forecast -
Today 5pm through Wed 4am

Issued by:
National Weather Service Boston / Norton, MA
Updated Mon Jul 13, 2026 3:37pm EDT

5:00pm

Mostly Sunny

85°F
Dew Pt 64°F
Heat Index: 86°F
Wind from SW

SW 10 mph
Precip: 7%

6:00pm

Partly Cloudy

83°F
Dew Pt 64°F
Heat Index: 84°F
Wind from SW

SW 12 mph
Precip: 6%

7:00pm

Partly Cloudy

82°F
Dew Pt 64°F
Heat Index: 83°F
Wind from SW

SW 10 mph
Precip: 4%

8:00pm

Partly Cloudy

79°F
Dew Pt 64°F
Wind from SW

SW 10 mph
Precip: 3%

9:00pm

Partly Cloudy

77°F
Dew Pt 63°F
Wind from SW

SW 10 mph
Precip: 4%

10:00pm

Mostly Clear

75°F
Dew Pt 62°F
Wind from SW

SW 10 mph
Precip: 4%

11:00pm

Mostly Clear

74°F
Dew Pt 62°F
Wind from SW

SW 9 mph
Precip: 2%

Tue
12:00am

Mostly Clear

73°F
Dew Pt 61°F
Wind from SW

SW 9 mph
Precip: 2%

Tue
1:00am

Partly Cloudy

73°F
Dew Pt 61°F
Wind from SW

SW 9 mph
Precip: 1%

Tue
2:00am

Mostly Clear

72°F
Dew Pt 60°F
Wind from SW

SW 9 mph
Precip: 2%

Tue
3:00am

Mostly Clear

71°F
Dew Pt 60°F
Wind from SW

SW 9 mph
Precip: 2%

Tue
4:00am

Mostly Clear

71°F
Dew Pt 60°F
Wind from SW

SW 9 mph
Precip: 2%

Tue
5:00am

Mostly Clear

70°F
Dew Pt 60°F
Wind from SW

SW 9 mph
Precip: 2%

Tue
6:00am

Sunny

70°F
Dew Pt 61°F
Wind from SW

SW 8 mph
Precip: 2%

Tue
7:00am

Sunny

72°F
Dew Pt 62°F
Wind from SW

SW 8 mph
Precip: 2%

Tue
8:00am

Sunny

75°F
Dew Pt 63°F
Wind from W

W 8 mph
Precip: 2%

Tue
9:00am

Mostly Sunny

80°F
Dew Pt 65°F
Heat Index: 82°F
Wind from W

W 9 mph
Precip: 2%

Tue
10:00am

Mostly Sunny

84°F
Dew Pt 66°F
Heat Index: 86°F
Wind from W

W 10 mph
Precip: 1%

Tue
11:00am

Sunny

87°F
Dew Pt 67°F
Heat Index: 90°F
Wind from W

W 10 mph
Precip: 1%

Tue
12:00pm

Sunny

90°F
Dew Pt 67°F
Heat Index: 93°F
Wind from W

W 12 mph
Precip: 0%

Tue
1:00pm

Mostly Sunny

92°F
Dew Pt 68°F
Heat Index: 96°F
Wind from W

W 12 mph
Precip: 0%

Tue
2:00pm

Mostly Sunny

94°F
Dew Pt 68°F
Heat Index: 99°F
Wind from W

W 13 mph
Precip: 0%

Tue
3:00pm

Mostly Sunny

95°F
Dew Pt 68°F
Heat Index: 100°F
Wind from W

W 13 mph
Precip: 0%

Tue
4:00pm

Mostly Sunny

96°F
Dew Pt 69°F
Heat Index: 102°F
Wind from W

W 14 mph
Precip: 0%

Tue
5:00pm

Mostly Sunny

97°F
Dew Pt 69°F
Heat Index: 103°F
Wind from W

W 14 mph
Precip: 0%

Tue
6:00pm

Mostly Clear

95°F
Dew Pt 69°F
Heat Index: 101°F
Wind from W

W 14 mph
Precip: 0%

Tue
7:00pm

Mostly Clear

94°F
Dew Pt 69°F
Heat Index: 99°F
Wind from W

W 13 mph
Precip: 0%

Tue
8:00pm

Partly Cloudy

91°F
Dew Pt 69°F
Heat Index: 96°F
Wind from SW

SW 10 mph
Precip: 0%

Tue
9:00pm

Mostly Clear

89°F
Dew Pt 69°F
Heat Index: 94°F
Wind from W

W 10 mph
Precip: 0%

Tue
10:00pm

Partly Cloudy

86°F
Dew Pt 69°F
Heat Index: 90°F
Wind from W

W 9 mph
Precip: 0%

Tue
11:00pm

Partly Cloudy

86°F
Dew Pt 69°F
Heat Index: 90°F
Wind from W

W 8 mph
Precip: 0%

Wed
12:00am

Partly Cloudy

85°F
Dew Pt 68°F
Heat Index: 88°F
Wind from W

W 8 mph
Precip: 0%

Wed
1:00am

Mostly Clear

85°F
Dew Pt 68°F
Heat Index: 88°F
Wind from W

W 8 mph
Precip: 0%

Wed
2:00am

Mostly Clear

84°F
Dew Pt 68°F
Heat Index: 87°F
Wind from W

W 8 mph
Precip: 0%

Wed
3:00am

Mostly Clear

83°F
Dew Pt 67°F
Heat Index: 86°F
Wind from W

W 9 mph
Precip: 0%

Wed
4:00am

Mostly Clear

82°F
Dew Pt 66°F
Heat Index: 84°F
Wind from W

W 9 mph
Precip: 1%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 132017
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
417 PM EDT Mon Jul 13 2026

.WHAT HAS CHANGED...
No major changes to the current forecast. 

&&

.KEY MESSAGES...

- High heat and humidity return Tuesday and Wednesday. Heat 
  Advisories in effect Tuesday morning through Wednesday 
  morning. Gusty southwest winds Tuesday and Tuesday night.

- Periods of unsettled weather possible later this 
  week.

&&

.DISCUSSION...

KEY MESSAGE 1...High heat and humidity return Tuesday and Wednesday. 
Heat Advisories in effect Tuesday morning through Wednesday morning. 
Gusty southwest winds Tuesday and Tuesday night.

Marginal instability and daytime heating have allowing a few 
isolated showers to develop across western MA this afternoon. Expect 
a few spot showers or perhaps a weak storm through the evening. 

An strong ridge aloft will advect higher heights and anomalously 
warm temperatures aloft into the region Tuesday into Wednesday. 925 
mb temperatures rise to +26-28C and with efficiently mixed gusty 
southwesterly to westerly winds. This will allow temperatures to 
rise well into the 90s both days for much of southern New England. 
Southwesterly flow will also help advect in a plume of higher 
dewpoint air with values in the upper 60s to near 70. The added 
humidity factor will make temperatures feel more like upper 90s and 
low 100s. Relief from the heat will be minimal with overnight 
temperatures in the mid 70s to near 80 Tuesday night into Wednesday 
AM. This has elevated HeatRisk into the Major category likely due to 
two days of abnormal heat and humidity with little overnight relief. 
This can impact a larger population of people including those who 
are heat sensitive and also those who do not use caution with the 
heat. On Tuesday, the CT Valley and eastern MA have the higher 
probability for temperatures in the upper 90s/heat index in low 
100s. As a trough shifts south into Wednesday the heat shifts toward 
the south coast while still remaining hot across other parts of 
southern New England. Heat Advisories will be in effect Tuesday 
through Wednesday morning for much of southern New England with the 
exception of the Cape and Islands and Berkshires. Cape Cod was 
borderline for Wednesday, but kept them out due to the lower 
confidence in how many locations will hit 90 and onshore SW winds. 
If confidence increases they may be added to the existing Advisory. 

This is a growing risk for gusty southwesterly winds Tuesday into 
Tuesday night. Model soundings show sufficient mixing down of higher 
winds aloft; however, there is uncertainty in how strong the winds 
are aloft and to what degree they get mixed to the surface. It is 
likely we will see gusts increase late afternoon with gusts 20-30 
mph. It can't be ruled out for localized higher gusts 35-40 mph 
across the south shore and Cape/Islands, late afternoon through 
Tuesday night as a LLJ strengthens over the region. 


KEY MESSAGE 2...Periods of unsettled weather possible later this 
week.

The period of elevated heat comes to an end for the latter half of 
the week as the upper level ridge starts to sag more south of the 
region. 850 mb temperatures start to fall back below 20C and by 
Friday fall to between 10-15C across southern New England. With the 
ridge's influence over the region weakening, a strengthening upper 
level trough moving across Quebec will move in during this period as 
well. Guidance has continued to show the possibility of shortwaves 
moving along the base of the trough over southern New England 
starting as early as Wednesday night, continuing into the weekend. 
These could bring the risk for more unsettled conditions to round 
out the week, especially for the weekend.

CSU ML probs are hinting at the risk for damaging winds and possible 
severe hail for Wednesday into Thursday, however, these 
probabilities remain low at this time. This would be associated with 
an incoming cold front that may bring an increased risk of showers 
and storms, though coverage is looking more isolated based on the 
latest guidance.


&&

.AVIATION /20Z MONDAY THROUGH SATURDAY/...
Forecaster Confidence Levels...

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

Today and Tonight: High Confidence. Moderate for shower chances. 

VFR conditions are expected across all terminals today. SW winds
at 10-15 kts with gusts 20-25kt this afternoon. Winds decrease
after 00Z to some degree, but there is some question if some
terminals may not decouple overnight with winds staying
elevated. If winds do decouple, LLWS may be possible for a few 
hours across the SE MA terminals overnight. Due to lower 
confidence this has been kept out of the TAF for now, but may be
added for the 00Z TAF update. A few pop-up showers may be 
possible across the area, however given the low coverage of 
showers has been messages as VCSH or PROB30 for showers this 
afternoon through around 00Z. 

Tuesday: High Confidence. 

VFR. SW winds 10-20 kts with gusts 20-30 kts. 

KBOS Terminal...High Confidence.

KBDL Terminal...High confidence.

Outlook /Wednesday through Saturday/...

Wednesday: VFR. Breezy. 

Wednesday Night: VFR. 

Thursday through Friday: VFR. Breezy. 

Friday Night: VFR. Slight chance SHRA.

Saturday: Mainly VFR, with local IFR possible. Chance SHRA,
slight chance TSRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Wednesdsay...High confidence.

Gusty southwest winds expected Tuesday and Tuesday night. SCA 
have been issued Tuesday, with gusty southwest winds 25-30 kts 
across the southern and eastern waters. A SCA has now been added
for Boston Harbor and Mass Bay for a period of gusts 25 kts late
Tuesday afternoon through the evening. Seas will be quite 
choppy Tuesday into Wednesday morning with wave heights 5-8 ft 
possible across the southern ocean waters and 3-5 ft along the 
coastal waters, including Vineyard and Nantucket Sounds.

Agitated seas will raise the risk to "moderate" for rip 
currents Tuesday and Wednesday. The southcoast and south-facing 
beaches of Martha's Vineyard and Nantucket have the higher risk 
for due to prolonged gusty southwesterly flow.

Outlook /Wednesday through Saturday/...

Wednesday: Low risk for Small Craft Advisory winds with gusts
up to 25 kt. Local rough seas. 

Wednesday Night through Friday: Winds less than 25 kt. Seas
locally approaching 5 ft. 

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

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Heat Advisory from 11 AM Tuesday to 8 PM EDT Wednesday for 
     CTZ002>004.
MA...Heat Advisory from 11 AM Tuesday to 8 PM EDT Wednesday for 
     MAZ003>007-010>021-026.
     Air Quality Alert from 11 AM to 11 PM EDT Tuesday for 
     MAZ017>024.
RI...Heat Advisory from 11 AM Tuesday to 8 PM EDT Wednesday for 
     RIZ001>007.
     Air Quality Alert from 11 AM to 11 PM EDT Tuesday for 
     RIZ001>008.
MARINE...Small Craft Advisory from 4 PM to 11 PM EDT Tuesday for ANZ230-
     231-250-251.
     Small Craft Advisory from noon Tuesday to 11 AM EDT Wednesday 
     for ANZ232-233-235-237-254>256.
     Small Craft Advisory from noon Tuesday to 5 AM EDT Wednesday 
     for ANZ234.

&&

$$

DISCUSSION...Hrencecin/Mensch
AVIATION...Hrencecin/Mensch/Guest
MARINE...Hrencecin/Mensch

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