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Winchester, CT Weather Forecast

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Mostly Cloudy

67°F

Updated	2:46 pm
Feels Like	51°F
Humidity	48%
Wind	NE 17 mph
Barometer	30.51 in
Dew Point	47°F

Mostly Cloudy

19°C

Updated	2:46 pm
Feels Like	11°C
Humidity	48%
Wind	NE 27 km/h
Barometer	103.3 kPa
Dew Point	8°C

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Cloud Cover	100%
uv UV Index	5
Sunrise	6:41 AM
Sunset	6:48 PM
Moonrise	5:26 PM
Moonset	3:12 AM

Civil Twilight
6:10 AM to 6:38 AM
6:48 PM to 7:16 PM
Winchester CT Weather - Waxing Gibbous Moon

Waxing Gibbous Moon

Winchester Weather Forecast

TODAY	TONIGHT	THURSDAY	THURSDAY NIGHT	FRIDAY	FRIDAY NIGHT	SATURDAY	SUNDAY	SUNDAY NIGHT	MONDAY	MONDAY NIGHT	TUESDAY

Mostly Sunny	Mostly Clear	Sunny	Partly Cloudy	Chance of Showers	Chance of Showers	Showers	Showers	Chance of Showers	Partly Sunny	Partly Cloudy	Sunny
Hi: 61°FHi: 16°C	Lo: 45°FLo: 7°C	Hi: 61°FHi: 16°C	Lo: 45°FLo: 7°C	Hi: 61°FHi: 16°C	Lo: 51°FLo: 11°C	Hi: 61°FHi: 16°C Lo: 50°FLo: 10°C	Hi: 61°FHi: 16°C Lo: 50°FLo: 10°C	Lo: 50°FLo: 10°C	Hi: 65°FHi: 18°C	Lo: 50°FLo: 10°C	Hi: 69°FHi: 21°C
				POP: 30%	POP: 50%	POP: 60%	POP: 60%	POP: 50%

POP = Probability of Precipitation.

Weather Outlook Updated: 830 AM EDT Wed Sep 23 2026 Winchester, CT Weather - WeatherWorld.com

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Meteorlogic Glosserator
Instant definitions for any meteorological term.

Issued: 116 PM EDT Wed Sep 23 2026

Key Messages

1) Continued dry conditions with below normal temps continue through Thursday.

2) While forecast confidence is low on the exact track and timing of a potential coastal low Friday into the weekend, there is a low to moderate chance for breezy conditions for locations from the Capital Region south and east.

Discussion

... KEY MESSAGE 1... A strong Canadian surface anticyclone over south-central Quebec continues to funnel dry and chilly air over the forecast area this morning. A weak upper...

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Weather 101: Term of the Day

Supercell Thunderstorm

Potentially the most dangerous of the convective storm types. Storms possessing this structure have been observed to generate the vast majority of long-lived strong and violent (F2-F5) tornadoes, as well as downburst damage and large hail. It is defined as a thunderstorm consisting of one quasi-steady to rotating updraft which may exist for several hours. Supercells usually move to the right of the mean wind. These are called "Right Movers" and they are favored with veering winds. Occasionally, these thunderstorms will move to the left of the mean wind. These thunderstorms are called "Left Movers". These supercells typically don't last as long as their "Right Mover" cousins and they usually only produce large hail (greater than 3/4 inch in diameter) and severe wind gusts in the excess of 58 miles an hour. Left Movers are favored when you have backing winds. Radar will observe essentially one long-lived cell, but small perturbations to the cell structure may be evident. The stronger the updraft, the better the chance that the supercell will produce severe (hail greater than 3/4 inch in diameter, wind gusts greater than 58 miles an hour, and possibly a tornado) weather. Severe supercell development is most likely in an environment possessing great buoyancy (CAPE) and large vertical wind shear. A Bulk Richardson Number of between 15 and 35 favor supercell development. Typically, the hodograph will look like a horse shoe. This is due to the wind speed increasing rapidly with height and the wind direction either veering or backing rapidly with height.