Lexington, Massachusetts, USA
35.1°F
1.7°C
Cold
Clear
Tonight: Lo 67 °F
Monday: Hi 74 °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 Saturday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 0 mph
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Sun Aug 16, 2026 12:24pm EDT
- Widespread showers expected tonight into Tuesday although the overall rainfall totals have continued to trend down.
- Scattered showers and a few storms possible later Tuesday. Increased chances for showers arrive for late-week.
Mostly Cloudy then Chance Rain Showers
Lo 67 °F
A chance of rain showers after midnight. Mostly cloudy, with a low around 67. South wind around 8 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
Rain Showers Likely
Hi 74 °F
Rain showers likely before 7am, then rain showers likely and patchy fog. Cloudy, with a high near 74. South wind 5 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Patchy Fog
Lo 66 °F
Patchy fog and a slight chance of rain showers before 2am. Mostly cloudy, with a low around 66. Northeast wind around 5 mph. Chance of precipitation is 20%.
Partly Sunny
Hi 81 °F
Partly sunny, with a high near 81. Northeast wind around 5 mph.
Partly Cloudy
Lo 63 °F
Partly cloudy, with a low around 63. South wind around 5 mph.
Sunny
Hi 85 °F
Sunny, with a high near 85. Southwest wind 2 to 7 mph.
Partly Cloudy then Slight Chance Rain Showers
Lo 65 °F
A slight chance of rain showers after 3am. Partly cloudy, with a low around 65. West wind around 6 mph.
Chance Rain Showers
Hi 82 °F
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 82. Northwest wind around 6 mph. Chance of precipitation is 40%.
Chance Showers And T-Storms then Partly Cloudy
Lo 59 °F
A chance of showers and thunderstorms before 11pm. Partly cloudy, with a low around 59. Northwest wind around 5 mph. Chance of precipitation is 30%.
Sunny
Hi 80 °F
Sunny, with a high near 80. North wind around 6 mph.
Slight Chance Rain Showers
Lo 59 °F
A slight chance of rain showers between 8pm and 2am. Partly cloudy, with a low around 59. South wind 2 to 6 mph.
Mostly Sunny then Slight Chance Rain Showers
Hi 79 °F
A slight chance of rain showers after 2pm. Mostly sunny, with a high near 79. Northeast wind 2 to 7 mph.
Chance Rain Showers
Lo 61 °F
A chance of rain showers. Mostly cloudy, with a low around 61. East wind around 6 mph. Chance of precipitation is 30%.
Chance Rain Showers
Hi 82 °F
A chance of rain showers. Mostly sunny, with a high near 82. Northwest wind 3 to 8 mph.
Issued by:
National Weather Service Boston / Norton, MA
Updated Sun Aug 16, 2026 12:24pm EDT

S 8 mph
S 8 mph
S 7 mph
S 7 mph
S 7 mph
S 7 mph
S 7 mph
S 8 mph
S 8 mph
S 7 mph
S 7 mph
S 7 mph
S 7 mph
S 8 mph
S 8 mph
S 8 mph
S 8 mph
S 7 mph
S 7 mph
S 6 mph
SE 5 mph
SE 5 mph
E 3 mph
E 3 mph
E 3 mph
NE 2 mph
NE 2 mph
N 2 mph
N 2 mph
N 3 mph
N 3 mph
N 5 mph
N 5 mph
N 5 mph
N 5 mph
N 5 mph
000
FXUS61 KBOX 170005
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
805 PM EDT Sun Aug 16 2026
.WHAT HAS CHANGED...
Rainfall coverage and amounts have trended lower for late tonight
into Monday.
&&
.KEY MESSAGES...
- Widespread showers expected tonight into Tuesday although the
overall rainfall totals have continued to trend down.
- Scattered showers and a few storms possible later
Tuesday. Increased chances for showers arrive for late-week.
&&
.DISCUSSION...
KEY MESSAGE 1...Widespread showers expected tonight into
Tuesday although the overall rainfall totals have continued to
trend down.
A low pressure system off the southern Long Island waters will
move east tonight bringing a widespread wave of rain showers to
southern New England, some of which is already beginning to
slowly push into northern NJ/ southern NY. Dewpoints have been
steadily rising throughout the day, and will continue to do so
into the night as prolonged southwesterly flow advects PWATs of
1.8-2.0 inches into the region. Latest guidance has indicated
the low will remain far enough south to keep the heaviest
rainfall along the south coast, Cape & Islands, southern RI, and
southern CT. Showers will slowly push east and overspread the
region around sunset, with highest chances for heaviest rainfall
between midnight and sunrise Monday morning. The commute Monday
will likely be wet as showers linger across RI and eastern MA
through the morning and early afternoon, with the Cape and
Islands seeing the rain hang on into the early evening. Rainfall
totals have continued to trend lower with each round of model
guidance... latest trends indicate between 0.10" and 0.33", with
Nantucket and the outer Cape possibly seeing near 0.50".
Dewpoints will remain higher (near 70) even once the rain stops,
so looking at a muggy and overcast evening/night Monday.
KEY MESSAGE 2...Seasonably warm temperatures and moderate
humidity return through the middle of next week, followed by
increasing shower chances late in the week.
High pressure slowly builds in Tuesday supporting increasing
sunshine and dry conditions for much of the day. A mix of
diurnal heating, residual moisture, and a weak shortwave in the
flow may help trigger scattered showers in the
afternoon/evening. Instability will likely be marginal, but
enough to support the potential for a few thunderstorms in the
mix as well. Temperatures range in the upper 70s to low 80s
perhaps a little warmer for the CT Valley.
Flow aloft stays zonal Wednesday through Friday. A stronger
shortwave trough moves through eastern Canada later Wednesday
through Thursday accompanied by a cold front. There is potential
for a leading shortwave to trigger a few showers late Wednesday
night, otherwise Wednesday is likely to remain dry. The main
shortwave moves through Thursday accompanied by better ascent
and plume of slightly above normal moisture. This will bring an
increased risk for showers Thursday. Ensemble probabilities
range 50 to 80 percent with higher end of probabilities over the
south coast, southeast MA, and Cape/Islands.
We'll be in a post-frontal airmass Friday resulting in slightly
cooler temperatures in the mid 70s to low 80s and a downtick in
humidity. Overall, high pressure is likely to push in from the
west bringing mainly dry conditions. However, there are
indications across model guidance of a boundary stalling
offshore with a series of embedded shortwaves riding that
boundary Friday through the weekend. This may bring periodic
chances for showers, perhaps some thunderstorms if the waves
align with diurnal heating. The higher risk for showers will
the for south coast extending to Cape Cod/Islands.
&&
.AVIATION /00Z MONDAY THROUGH FRIDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
00z TAF Update...
Tonight...High confidence in trends, moderate confidence in
timing.
Mainly VFR conditions persist this evening. Scattered showers
arrive from west to east tonight 00-04Z for interior reaching
I-95 corridor 05-07Z. MVFR/localized IFR ceilings accompany the
showers spreading across the interior between 04z and 08z and
reach the I-95 corridor 10-12z. S winds generally 6-12 knots.
Monday...Moderate confidence (ceilings)
Low end MVFR with localized IFR/LIFR ceilings possible.
Scattered showers with the higher chances through early
afternoon. Isolated showers possible through 00Z. SSE winds
8-15 kts, turning more E/ENE late afternoon.
Monday Night...Moderate Confidence.
IFR/localized LIFR ceilings possible with patchy FG. Light N
winds.
KBOS Terminal...High confidence in TAF. Seabreeze should kick
out 20z-22z time frame. VFR persists today and most of
tonight...but MVFR with localized IFR conditions should arrive
toward the Monday morning push.
KBDL Terminal...High confidence in TAF.
Outlook /Tuesday through Friday/...
Tuesday: Mainly VFR, with local MVFR possible. Slight chance
SHRA.
Tuesday Night through Wednesday: VFR.
Wednesday Night: VFR. Slight chance SHRA.
Thursday: VFR. Chance SHRA, slight chance TSRA.
Thursday Night: VFR. Slight chance SHRA.
Friday: VFR.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Monday Night...High confidence.
South-southwesterly winds increase to around 20 kt tonight,
then shift to southeast Monday morning then east by late
afternoon, with gusts of 20 to 25 kt. Seas build to 5 to 8 ft by
early Monday morning as the low approaches. Small Craft
Advisories remain in effect through Monday night.
The risk for rip currents increases Monday along south-facing
beaches, then Tuesday along east-facing beaches, as rough seas
and long-period swells settle in behind the departing system.
Outlook /Tuesday through Friday/...
Tuesday: Winds less than 25 kt. Seas up to 5 ft.
Tuesday Night: Winds less than 25 kt. Seas locally approaching
5 ft.
Wednesday through Wednesday Night: Winds less than 25 kt.
Thursday through Thursday Night: Winds less than 25 kt. Chance
of rain showers, slight chance of thunderstorms.
Friday: Winds less than 25 kt. Slight chance of rain showers.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory from 8 AM to 11 PM EDT Monday for ANZ231-
232-250-251-254.
Small Craft Advisory from 2 AM Monday to 2 AM EDT Tuesday for
ANZ233>235-237-255-256.
&&
$$
DISCUSSION...McMinn/Mensch
AVIATION...McMinn/Mensch
MARINE...McMinn/Mensch
Radar images courtesy Weather Underground / Intellicast.
UV Index forecast high for today: 1 Low
Current (Measured): 0.0 None
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
Saturday:
0.01 in
August:
1.26 in
2026
1:17pm
36.1°F
High today:
12:00am
25.2°F
Low today:
2:28pm
30.4°F
High Saturday:
7:11am
16.2°F
Low Saturday:
12:00am
25.2°F
Low wind chill today:
7:11am
16.2°F
Low wind chill Saturday:
1:17pm
33.3°F
High dew pt today:
11:56pm
20.7°F
High dew pt Saturday:
None
Wind gust today:
None
Wind gust Saturday:
No alerts/warnings active for Southeast Middlesex County.
First Light:
6:11am
Sunrise:
6:39am
Sunset:
5:19pm
Twilight ends:
5:47pm
Daylight length:
10 hours 39 minutes
Phase:
Waxing Crescent (82%)
Moon set:
8:18am
Moon rise:
9:38pm