Old Res Weather
Lexington, Massachusetts, USA
- Partly cloudy
-
35.1°F / 1.7°C
-
32.4°F
- 90%
- Calm, 10-min avg: Calm, gust: None
-
- 10 miles
- 0.01 in
- $VPuv None
Current Conditions [‒] Current Conditions [+]
35.1°F
1.7°C
Cold
Partly cloudy
Independence Day: Hi 96 °F
Tonight: Lo 66 °F
Dew Point:
32.4°F
Humidity: 90%
UV Index: 0.0 None
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.01 in
Rain Friday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 0 mph
Alerts / Advisories [‒] Alerts / Advisories [+]
Forecast [‒] Forecast [+]
NWS Weather Forecast -
Independence Day,
Tonight,
&
Sunday
through
Friday Night
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Sat Jul 4, 2026 9:16am EDT
Overview:
- Hot and humid today with a few showers & t-storms this afternoon into tonight...but not a washout. Main severe weather/damaging wind gust threat is to our southwest with just a low risk in our region with the best chance for that in southwest MA/CT.
- Much cooler temperatures for the first half of next week and that is especially true if the potential for a soaking heavy rain comes to fruition in the late Sun through Tue time frame.
Independence Day:
Partly Sunny then Chance Showers And T-Storms
Hi 96 °F
A slight chance of rain showers between 1pm and 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then a chance of showers and thunderstorms. Partly sunny. High near 96, with temperatures falling to around 90 in the afternoon. Heat index values as high as 97. West wind 8 to 12 mph, with gusts as high as 24 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Tonight:
Chance Showers And T-Storms then Mostly Cloudy
Lo 66 °F
A chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms between 7pm and 10pm. Mostly cloudy, with a low around 66. Northwest wind 2 to 9 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Sunday:
Mostly Sunny
Hi 82 °F
Mostly sunny, with a high near 82. East wind 3 to 8 mph.
Sunday Night:
Mostly Cloudy
Lo 62 °F
Mostly cloudy, with a low around 62. Southeast wind 2 to 8 mph.
Monday:
Scattered Rain Showers
Hi 77 °F
Scattered rain showers after 8am. Mostly cloudy, with a high near 77. Southeast wind 3 to 9 mph. Chance of precipitation is 50%.
Monday Night:
Chance Showers And T-Storms
Lo 61 °F
A chance of rain showers before 10pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 61. East wind 3 to 8 mph. Chance of precipitation is 70%.
Tuesday:
Chance Showers And T-Storms
Hi 75 °F
A chance of showers and thunderstorms. Partly sunny, with a high near 75. East wind 6 to 10 mph. Chance of precipitation is 60%.
Tuesday Night:
Slight Chance Rain Showers
Lo 60 °F
A slight chance of rain showers. Partly cloudy, with a low around 60. Northeast wind 3 to 8 mph.
Wednesday:
Slight Chance Rain Showers
Hi 80 °F
A slight chance of rain showers before 5pm. Mostly sunny, with a high near 80. Northeast wind 3 to 7 mph.
Wednesday Night:
Partly Cloudy
Lo 65 °F
Partly cloudy, with a low around 65. South wind around 6 mph.
Thursday:
Mostly Sunny then Slight Chance Showers And T-Storms
Hi 92 °F
A slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 92. Southwest wind 3 to 8 mph.
Thursday Night:
Slight Chance Showers And T-Storms
Lo 68 °F
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 68. Southwest wind 5 to 8 mph.
Friday:
Chance Rain Showers
Hi 88 °F
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 88. Southwest wind 5 to 8 mph. Chance of precipitation is 50%.
Friday Night:
Chance Showers And T-Storms
Lo 62 °F
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. West wind around 7 mph.
NWS Hourly Forecast -
Today 1pm through Mon 12am
Issued by:
National Weather Service Boston / Norton, MA
Updated Sat Jul 4, 2026 9:16am EDT
1:00pm
Dew Pt 67°F
Heat Index: 97°F
W 10 mphPrecip: 20%
2:00pm
Dew Pt 67°F
Heat Index: 97°F
W 12 mphPrecip: 26%
Rain: 0.02 in
3:00pm
Dew Pt 67°F
Heat Index: 97°F
W 12 mphPrecip: 28%
Rain: 0.02 in
4:00pm
Dew Pt 67°F
Heat Index: 96°F
W 12 mphPrecip: 30%
Rain: 0.02 in
5:00pm
Dew Pt 67°F
Heat Index: 93°F
W 10 mphPrecip: 33%
Rain: 0.02 in
6:00pm
Dew Pt 66°F
Heat Index: 90°F
W 9 mphPrecip: 27%
Rain: 0.02 in
7:00pm
Dew Pt 66°F
Heat Index: 87°F
NW 8 mphPrecip: 22%
Rain: 0.01 in
8:00pm
Dew Pt 67°F
Heat Index: 85°F
NW 6 mphPrecip: 16%
9:00pm
Dew Pt 65°F
Heat Index: 82°F
NW 6 mphPrecip: 15%
10:00pm
Dew Pt 65°F
NW 5 mphPrecip: 13%
11:00pm
Dew Pt 64°F
NW 5 mphPrecip: 12%
12:00am
Dew Pt 63°F
NW 3 mphPrecip: 12%
1:00am
Dew Pt 62°F
NW 3 mphPrecip: 11%
2:00am
Dew Pt 62°F
N 2 mphPrecip: 11%
3:00am
Dew Pt 62°F
NW 2 mphPrecip: 12%
4:00am
Dew Pt 61°F
SW 2 mphPrecip: 12%
5:00am
Dew Pt 61°F
SW 2 mphPrecip: 13%
6:00am
Dew Pt 61°F
S 3 mphPrecip: 10%
7:00am
Dew Pt 61°F
E 3 mphPrecip: 6%
8:00am
Dew Pt 60°F
NE 5 mphPrecip: 3%
9:00am
Dew Pt 59°F
NE 6 mphPrecip: 3%
10:00am
Dew Pt 59°F
NE 7 mphPrecip: 3%
11:00am
Dew Pt 58°F
E 7 mphPrecip: 3%
12:00pm
Dew Pt 57°F
E 8 mphPrecip: 3%
1:00pm
Dew Pt 57°F
E 8 mphPrecip: 3%
2:00pm
Dew Pt 56°F
E 8 mphPrecip: 3%
3:00pm
Dew Pt 56°F
E 8 mphPrecip: 3%
4:00pm
Dew Pt 56°F
E 8 mphPrecip: 2%
5:00pm
Dew Pt 57°F
E 8 mphPrecip: 2%
6:00pm
Dew Pt 57°F
SE 8 mphPrecip: 2%
7:00pm
Dew Pt 57°F
SE 7 mphPrecip: 2%
8:00pm
Dew Pt 58°F
SE 7 mphPrecip: 3%
9:00pm
Dew Pt 58°F
SE 6 mphPrecip: 4%
10:00pm
Dew Pt 59°F
SE 6 mphPrecip: 6%
11:00pm
Dew Pt 59°F
S 5 mphPrecip: 7%
12:00am
Dew Pt 59°F
S 5 mphPrecip: 8%
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 041132
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
732 AM EDT Sat Jul 4 2026
.WHAT HAS CHANGED...
The Extreme Heat Warning was replaced with a Heat Advisory for
southern New England through 8 pm this evening.
&&
.KEY MESSAGES...
- Hot and humid today with a few showers & t-storms this afternoon
into tonight...but not a washout. Main severe weather/damaging
wind gust threat is to our southwest with just a low risk in our
region with the best chance for that in southwest MA/CT.
- Much cooler temperatures for the first half of next week and
that is especially true if the potential for a soaking heavy
rain comes to fruition in the late Sun through Tue time frame.
&&
.DISCUSSION...
KEY MESSAGE 1...Hot and humid today with a few showers & t-storms
this afternoon into tonight...but not a washout. Main severe
weather/damaging wind gust threat is to our southwest with just a
low risk in our region with the best chance for that in southwest MA
One more hot and humid day of weather is on tap for southern New
England today. However...the upper level ridge is in the process of
breaking down which will result in somewhat lower mid level
temperatures. So while we will not see the extreme heat of the past
two days...still expect highs to reach the middle 90s in many
locations. Heat indices of 95-102 are expected today...so not to the
extreme levels of the past two days. Nonetheless...this will be the
4th day of heat and humidity in our region which is significant. We
did collaborate with our surrounding offices to replace the Extreme
Heat Warning with an Advisory...but the overall message has not
changed.
The other concern for today will be assessing the convective
potential. We still expect to generate some modest instability
today...but the higher instability/steeper mid level lapse rates
will be to our southwest. We often see the convection tend to
gravitate towards the axis of better instability. The CAMs seems to
want to follow that path as well as they show the main potential for
severe weather/damaging wind gusts and most widespread convection to
our southwest. That being said...given modest instability and
effective shear of 30-40 knots we can not rule out a low probability
of severe weather in our region. This is particularly true across
southwest MA/northern CT as it is possible they end up on the
northern edge of complex of thunderstorms.
So in a nutshell...a few showers & t-storms are possible this
afternoon into tonight but not expecting a washout. While a low risk
for severe weather can not be ruled out...appears the greater
potential will be to our southwest. If any severe weather were to
our occur in our region the main risk would be locally strong to
damaging straight line wind gusts and brief torrential rainfall.
KEY MESSAGE 2...Much cooler temperatures for the first half of next
week and that is especially true if the potential for a soaking
heavy rainfall occurs in the late Sun into Tue time frame.
All of the model guidance is in very good agreement in the upper
level ridge breaking down bringing much cooler temperatures for the
first half of next week. Now just how much we cool will depend upon
if a potential soaking heavy rain occurs in the late Sun through Tue
time frame. This part of the forecast remains quite uncertain. There
are ingredients in place that would support a heavy rainfall with
high pressure over eastern Canada and low pressure passing to our
south. This sets up a potential over running setup for band of heavy
rain and perhaps embedded thunderstorms. The ensembles show a large
spread in potential outcomes from very limited rainfall to several
inches of rain! Trying to forecast synoptic rainfall during the
summer when baroclinicity is weak and convective processes are
involved is quite difficult. We will need more time to sort this
out. However...given summer Pwats of 1.5-2+ inches if we are able to
get sufficient forcing in our region then the potential heavy
rainfall would be realized. That remains to be seen but something we
will continue to watch.
&&
.AVIATION /12Z SATURDAY THROUGH WEDNESDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
12z TAF Update...
Today through Sunday...High confidence.
VFR conditions dominate today through Sunday. We will need to watch
for a few showers and isolated t-storms mainly this afternoon and
tonight. Convective activity is already more active than
anticipated across upstate New York. Concerns are increasing
that storms will be more widespread than expected given frontal
boundary flirting with the region today. High resolution
guidance is widely varied regarding areal coverage and
intensity of storms this afternoon but have elected to
introduce PROB30 for TSRA at most mainland terminals between 17
and 21Z. Potential for a second round of thunderstorms around
the 00Z hour will need to be monitored as a potential addition
in future amendments.
WNW winds may but to 20+ knots at times this afternoon. Winds
diminish tonight and turn light N/calm before coming light E on Sun.
KBOS Terminal...Moderate confidence in TAF. Uncertainty
surrounding thunderstorm coverage and duration.
KBDL Terminal...High confidence in TAF.
Outlook /Sunday Night through Wednesday/...
Sunday Night: VFR. Chance SHRA.
Monday: Mainly VFR, with local MVFR possible. Breezy. Numerous
SHRA, isolated TSRA.
Monday Night: Mainly VFR, with local MVFR possible. Breezy.
Numerous SHRA, slight chance TSRA.
Tuesday: Mainly VFR, with local MVFR possible. Breezy.
Scattered SHRA, isolated TSRA.
Tuesday Night through Wednesday: VFR. Slight chance SHRA.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Today through Sunday...High confidence.
A relatively weak pressure gradient will keep winds/seas below small
craft advisory thresholds this Holiday Weekend. Some 20+ knot WNW
wind gusts over the land later this morning and afternoon may result
in some near shore chop...But no headlines will be needed for the
waters this weekend with seas generally 3 feet or less.
Outlook /Sunday Night through Wednesday/...
Sunday Night: Winds less than 25 kt. Chance of rain showers.
Monday: Winds less than 25 kt. Scattered rain showers, isolated
thunderstorms.
Monday Night: Winds less than 25 kt. Areas of seas approaching
5 ft. Numerous rain showers, slight chance of thunderstorms.
Tuesday: Winds less than 25 kt. Seas up to 5 ft. Scattered rain
showers, isolated thunderstorms.
Tuesday Night: Winds less than 25 kt. Seas up to 5 ft. Chance
of rain showers.
Wednesday: Winds less than 25 kt. Seas up to 5 ft. Slight
chance of rain showers.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Heat Advisory until 8 PM EDT this evening for CTZ002>004.
MA...Heat Advisory until 8 PM EDT this evening for MAZ002>023-026.
RI...Heat Advisory until 8 PM EDT this evening for RIZ001>007.
MARINE...None.
&&
$$
DISCUSSION...Frank
AVIATION...Frank/Guest
MARINE...Frank
Radar [‒] Radar [+]
Radar images courtesy Weather Underground / Intellicast.
Satellite [‒] Satellite [+]
Satellite images courtesy Weather Underground / Intellicast.
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UV Forecast [‒] UV Forecast [+]
UV Index forecast from the Environmental Protection Agency
UV Index forecast high for today: 9 Very High
Current (Measured): 0.0 None
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:
0.01 in
Rain Today:
0.00 in
Friday:
0.01 in
July:
1.26 in
2026
Daily Extremes [‒] Daily Extremes [+]
1:17pm
36.1°F
High today:
12:00am
25.2°F
Low today:
2:28pm
30.4°F
High Friday:
7:11am
16.2°F
Low Friday:
12:00am
25.2°F
Low wind chill today:
7:11am
16.2°F
Low wind chill Friday:
1:17pm
33.3°F
High dew pt today:
11:56pm
20.7°F
High dew pt Friday:
None
Wind gust today:
None
Wind gust Friday:
Sun / Moon [‒] Sun / Moon [+]
First Light:
6:11am
Sunrise:
6:39am
Sunset:
5:19pm
Twilight ends:
5:47pm
Daylight length:
10 hours 39 minutes
Phase:
Waning Gibbous (82%)
Moon set:
8:18am
Moon rise:
9:38pm