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Willimantic, Connecticut 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Willimantic CT
National Weather Service Forecast for: Willimantic CT
Issued by: National Weather Service Norton, MA
Updated: 1:15 am EDT Aug 12, 2025
 
Overnight

Overnight: Mostly clear, with a low around 62. Calm wind.
Mostly Clear

Tuesday

Tuesday: Sunny and hot, with a high near 92. Calm wind becoming south 5 to 7 mph in the afternoon.
Hot

Tuesday
Night
Tuesday Night: Patchy fog after 3am.  Otherwise, increasing clouds, with a low around 65. South wind around 6 mph becoming calm  in the evening.
Mostly Clear
then Patchy
Fog
Wednesday

Wednesday: Patchy fog before 9am.  Otherwise, mostly sunny, with a high near 89. Heat index values as high as 95. Calm wind becoming south 5 to 9 mph in the morning.
Patchy Fog
then Mostly
Sunny
Wednesday
Night
Wednesday Night: A slight chance of showers and thunderstorms, then a chance of showers after 11pm.  Mostly cloudy, with a low around 69. South wind 3 to 6 mph.  Chance of precipitation is 30%.
Slight Chance
T-storms then
Chance
Showers
Thursday

Thursday: A chance of showers, with thunderstorms also possible after 11am.  Mostly cloudy, with a high near 89. Calm wind becoming west around 6 mph in the afternoon.  Chance of precipitation is 50%.
Chance
Showers then
Chance
T-storms
Thursday
Night
Thursday Night: A chance of showers before 9pm.  Partly cloudy, with a low around 65. Light north wind.  Chance of precipitation is 30%.
Chance
Showers then
Mostly Clear
Friday

Friday: Sunny, with a high near 86. Northeast wind around 6 mph.
Sunny

Friday
Night
Friday Night: Mostly clear, with a low around 59. Light and variable wind.
Mostly Clear

Lo 62 °F Hi 92 °F Lo 65 °F Hi 89 °F Lo 69 °F Hi 89 °F Lo 65 °F Hi 86 °F Lo 59 °F

Air Quality Alert
 

Overnight
 
Mostly clear, with a low around 62. Calm wind.
Tuesday
 
Sunny and hot, with a high near 92. Calm wind becoming south 5 to 7 mph in the afternoon.
Tuesday Night
 
Patchy fog after 3am. Otherwise, increasing clouds, with a low around 65. South wind around 6 mph becoming calm in the evening.
Wednesday
 
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 89. Heat index values as high as 95. Calm wind becoming south 5 to 9 mph in the morning.
Wednesday Night
 
A slight chance of showers and thunderstorms, then a chance of showers after 11pm. Mostly cloudy, with a low around 69. South wind 3 to 6 mph. Chance of precipitation is 30%.
Thursday
 
A chance of showers, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 89. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 50%.
Thursday Night
 
A chance of showers before 9pm. Partly cloudy, with a low around 65. Light north wind. Chance of precipitation is 30%.
Friday
 
Sunny, with a high near 86. Northeast wind around 6 mph.
Friday Night
 
Mostly clear, with a low around 59. Light and variable wind.
Saturday
 
Sunny, with a high near 88. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night
 
Mostly clear, with a low around 64. South wind 3 to 6 mph.
Sunday
 
Sunny and hot, with a high near 91. Light southwest wind increasing to 5 to 9 mph in the morning.
Sunday Night
 
Partly cloudy, with a low around 64. Southwest wind around 6 mph becoming northwest after midnight.
Monday
 
Mostly sunny, with a high near 84. North wind around 7 mph.

 

Forecast from NOAA-NWS for Willimantic CT.

Weather Forecast Discussion
067
FXUS61 KBOX 112335
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
735 PM EDT Mon Aug 11 2025

.SYNOPSIS...
Heat and humidity on the rise this week, peaking on Wednesday,
but not as oppressive as it was earlier in the summer. Scattered
showers and thunderstorms are expected ahead of a cold front
later Wednesday and Thursday, then dry and cooler weather
follows Friday into the weekend, but heat could return Sunday.

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
Key Message:

* Hot and humid today with clear skies.

High pressure building south of our waters is providing
southwesterly flow (with the exception of sea breezes along the
coasts)... bringing hot and humid air over southern New England.
This afternoon`s temperatures will peak in the low 90s for most
areas... upper 80s for the South Coast, Cape and Islands.

Another mainly clear night ahead with patchy fog possible near
Cape Cod/Islands and perhaps inland as well. Given the clear
skies and low winds, expecting some radiational cooling tonight
allowing the CT River Valley and Merrimack Valley to drop into
the low 60s.

&&

.SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/...
Key Messages:

* Heat and humidity continue to rise Tuesday, but still short of
  a Heat Advisory.

While heat and humidity continue to rise through midweek,
forecast soundings on Tuesday indicate fairly deep mixing...
bringing down drier air from aloft and lowering afternoon
dewpoints into upper 50s and lower 60s. This will reduce the
apparent temperatures Tuesday afternoon. While we`ll come close
to Heat Advisory criteria (heat index of 95-100F for 2 or more
hours) still thinking we`ll fall short of the 2 consecutive day
threshold. Regardless, it will be hot and humid, although not to
extent as what we experienced earlier in the summer.

&&

.LONG TERM /WEDNESDAY THROUGH MONDAY/...
Key Messages:

* Warm/humid with elevated heat indices Wed, but cold front brings a
  risk for t-storms Wed late-day into early Thurs.

* Cooler with lower humidity levels Fri/Sat with drier weather.

* Warming trend with rising humidity levels Sun.

Details:

Most active portion of this period is on Wed, with another day of
very warm to hot temperatures and some humidity leading to elevated
heat indices. With strong heating likely to permit mixing of drier
air aloft, still think modeled dewpoints (mid 70s) from the NBM are
running a bit high and ended up undercutting these by a few degrees,
which keeps heat indices in the mid to mid/upper 90s. A cold front
will also be arriving later in the day which will bring with it the
risk for thunderstorms given the warmth and humidity; however the
front`s timing looks offset from peak heating which could limit the
potency of any storms. The front won`t clear our area until Thurs,
which could bring additional showers or thunderstorms to eastern
MA/RI.

We then return to drier weather Fri through the weekend. Cooler
temperatures along with much lower levels of humidity are then
expected for Fri into Sat. However southwest flow returns on
Sun, which will bring a warming trend to temperatures along with
rising humidity levels.

&&

.AVIATION /00Z TUESDAY THROUGH SATURDAY/...
Forecaster Confidence Levels...

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

18z TAF Update: High confidence.

Through Tuesday: High confidence.

VFR rest of tonight and into Tuesday. Winds become light
tonight, then for Tuesday expect S/SW winds around 5-10 kt with
sea breezes along both coasts (starting at BOS around 15z and
PVD around 16-18z).

Tuesday Night: High confidence.

Mainly VFR, though coastal fog/stratus could bring IFR-VLIFR for
the Cape and Islands. Light winds.

KBOS terminal...High confidence in TAF. Seabreeze today should
shift to landbreeze light SWly around 01z Tue. Seabreezes again
anticipated Tue around ~15z.

KBDL terminal...High confidence in TAF.

Outlook /Wednesday through Saturday/...

Wednesday: VFR. Breezy. Slight chance SHRA, slight chance TSRA.

Wednesday Night: VFR. Breezy. Chance SHRA, slight chance TSRA.

Thursday: VFR. Chance SHRA, slight chance TSRA.

Thursday Night: VFR. Slight chance SHRA.

Friday through Saturday: VFR.

&&

.MARINE...
Forecaster Confidence Levels...

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

High confidence through the period.

Weak gradient will allow for sea breezes near shore today and
Tue before high pressure offshore brings increasing SW flow
thereafter, though winds and seas should remain below SCA
levels. Patchy fog may limit visibility later at night and early
in morning for much of this week.

Outlook /Wednesday through Saturday/...

Wednesday: Winds less than 25 kt.

Wednesday Night: Winds less than 25 kt. Seas locally
approaching 5 ft. Chance of rain showers, slight chance of
thunderstorms.

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

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

Friday through Saturday: Winds less than 25 kt.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Air Quality Alert until 11 PM EDT this evening for CTZ002>004.
MA...Air Quality Alert until 11 PM EDT this evening for MAZ004>016-
     026.
RI...None.
MARINE...None.

&&

$$

SYNOPSIS...Loconto/McMinn
NEAR TERM...McMinn
SHORT TERM...McMinn
LONG TERM...Loconto
AVIATION...Loconto/McMinn
MARINE...Loconto/McMinn
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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