Current Conditions

St. Thomas, Ontario

61°F16°C

Clear

Wind

ENE 15 mph24 km/h

Humidity

60%

Cloud Cover

30%

As of Tuesday, September 22, 2026 at 5:42 PM EDT

Today's Outlook

Day

Partly cloudy and mild, with a high of 61°F16°C. Windy from the ENE at 16 mph25 km/h. Dry air.

Night

Partly cloudy, with a low around 53°F12°C. Windy from the ENE at 15 to 16 mph25 to 25 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Clear	High 61°F16°C	Low 53°F12°C	Precip 0 in0 mm—	Cloud 33%	Wind ENE 15 mph25 km/h	Tuesday: Partly cloudy and mild, with a high of 61°F16°C. Windy from the ENE at 16 mph25 km/h. Dry air. Tuesday Night: Partly cloudy, with a low around 53°F12°C. Windy from the ENE at 15 to 16 mph25 to 25 km/h.
Clear	High 64°F18°C	Low 51°F11°C	Precip 0 in0 mm—	Cloud 34%	Wind ENE 15 mph24 km/h	Wednesday: Partly cloudy and mild, with a high of 64°F18°C and morning low of 52°F11°C. Breezy from the E at 15 mph24 km/h. Dry air. Wednesday Night: Partly cloudy, with a low around 51°F11°C. Breezy from the ENE at 15 mph24 km/h.
Clear	High 66°F19°C	Low 51°F11°C	Precip 0 in0 mm—	Cloud 13%	Wind E 10 mph17 km/h	Thursday: Mostly clear and mild, with a high of 66°F19°C and morning low of 51°F11°C. Breezy from the E at 10 to 11 mph17 to 18 km/h. Dry air. Thursday Night: Mostly clear, with a low around 52°F11°C. Breezy from the ENE at 11 to 13 mph17 to 21 km/h.
Clear	High 69°F21°C	Low 47°F9°CFeels 44°F6°C	Precip 0 in0 mm—	Cloud 37%	Wind NE 6 mph10 km/h	Friday: Partly cloudy and warm, with a high of 69°F21°C and morning low of 48°F9°C. Breezy from the NE at 6 to 8 mph10 to 13 km/h. Dry air. Friday Night: Partly cloudy, with a low around 47°F9°C. Breezy from the NE at 7 to 9 mph11 to 14 km/h.
Clear	High 72°F22°C	Low 51°F10°C	Precip 0 in0 mm—	Cloud 22%	Wind NNE 7 mph12 km/h	Saturday: Mostly clear and warm, with a high of 72°F22°C and morning low of 51°F10°C. Breezy from the NNE at 7 to 9 mph11 to 14 km/h. Dry air. Saturday Night: Mostly clear, with a low around 51°F10°C. Breezy from the NNE at 8 to 9 mph13 to 14 km/h.
Partly Cloudy	High 70°F21°C	Low 53°F12°C	Precip 0.01 in0.2 mm7%	Cloud 47%	Wind N 8 mph12 km/h	Sunday: Mostly cloudy and warm, with a high of 70°F21°C and morning low of 53°F12°C. Breezy from the N at 8 mph12 km/h. Dry air. Sunday Night: Partly cloudy, with a low around 53°F12°C. Breezy from the N at 7 to 8 mph12 to 13 km/h.
Clear	High 69°F21°C	Low 54°F12°C	Precip 0.01 in0.3 mm4%	Cloud 40%	Wind NNW 7 mph11 km/h	Monday: Partly cloudy and warm, with a high of 69°F21°C and morning low of 54°F12°C. Breezy from the NNW at 6 to 7 mph10 to 11 km/h. Monday Night: Partly cloudy, with a low around 55°F13°C. Breezy from the NNW at 7 mph11 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	TuesdaySep 22	61°F16°C	53°F12°C	0 in0 mm· —	33%	Clear	ENE 15 mph25 km/h
DayPartly cloudy and mild, with a high of 61°F16°C. Windy from the ENE at 16 mph25 km/h. Dry air. NightPartly cloudy, with a low around 53°F12°C. Windy from the ENE at 15 to 16 mph25 to 25 km/h.
	WednesdaySep 23	64°F18°C	51°F11°C	0 in0 mm· —	34%	Clear	ENE 15 mph24 km/h
DayPartly cloudy and mild, with a high of 64°F18°C and morning low of 52°F11°C. Breezy from the E at 15 mph24 km/h. Dry air. NightPartly cloudy, with a low around 51°F11°C. Breezy from the ENE at 15 mph24 km/h.
	ThursdaySep 24	66°F19°C	51°F11°C	0 in0 mm· —	13%	Clear	E 10 mph17 km/h
DayMostly clear and mild, with a high of 66°F19°C and morning low of 51°F11°C. Breezy from the E at 10 to 11 mph17 to 18 km/h. Dry air. NightMostly clear, with a low around 52°F11°C. Breezy from the ENE at 11 to 13 mph17 to 21 km/h.
	FridaySep 25	69°F21°C	47°F9°C Feels 44°F6°C	0 in0 mm· —	37%	Clear	NE 6 mph10 km/h
DayPartly cloudy and warm, with a high of 69°F21°C and morning low of 48°F9°C. Breezy from the NE at 6 to 8 mph10 to 13 km/h. Dry air. NightPartly cloudy, with a low around 47°F9°C. Breezy from the NE at 7 to 9 mph11 to 14 km/h.
	SaturdaySep 26	72°F22°C	51°F10°C	0 in0 mm· —	22%	Clear	NNE 7 mph12 km/h
DayMostly clear and warm, with a high of 72°F22°C and morning low of 51°F10°C. Breezy from the NNE at 7 to 9 mph11 to 14 km/h. Dry air. NightMostly clear, with a low around 51°F10°C. Breezy from the NNE at 8 to 9 mph13 to 14 km/h.
	SundaySep 27	70°F21°C	53°F12°C	0.01 in0.2 mm· 7%	47%	Partly Cloudy	N 8 mph12 km/h
DayMostly cloudy and warm, with a high of 70°F21°C and morning low of 53°F12°C. Breezy from the N at 8 mph12 km/h. Dry air. NightPartly cloudy, with a low around 53°F12°C. Breezy from the N at 7 to 8 mph12 to 13 km/h.
	MondaySep 28	69°F21°C	54°F12°C	0.01 in0.3 mm· 4%	40%	Clear	NNW 7 mph11 km/h
DayPartly cloudy and warm, with a high of 69°F21°C and morning low of 54°F12°C. Breezy from the NNW at 6 to 7 mph10 to 11 km/h. NightPartly cloudy, with a low around 55°F13°C. Breezy from the NNW at 7 mph11 km/h.
	TuesdaySep 29	69°F21°C	54°F12°C	0 in0 mm· —	39%	Clear	SW 5 mph8 km/h
DayPartly cloudy and warm, with a high of 69°F21°C and morning low of 54°F12°C. Light wind from the SW around 5 mph8 km/h. NightPartly cloudy, with a low around 54°F12°C. Light wind from the N around 5 mph8 km/h.
	WednesdaySep 30	69°F20°C	57°F14°C	0.08 in2 mm· 20%	66%	Showers	SSE 8 mph12 km/h
DayMostly cloudy and warm, with a high of 69°F20°C and morning low of 57°F14°C. Breezy from the SSE at 8 to 9 mph13 to 14 km/h. 15% chance of drizzle throughout the day. NightMostly cloudy, with a low around 57°F14°C. Breezy from the SE at 8 to 10 mph12 to 15 km/h. 20% chance of showers in the evening.
	ThursdayOct 1	68°F20°C	59°F15°C	0.15 in3.8 mm· 24%	69%	Showers	SSW 10 mph16 km/h
DayMostly cloudy and mild, with a high of 68°F20°C and morning low of 59°F15°C. Breezy from the SSW at 10 to 11 mph17 to 18 km/h. 24% chance of light rain throughout the day. NightMostly cloudy, with a low around 60°F15°C. Breezy from the S at 10 mph15 km/h. 18% chance of showers throughout the night.
	FridayOct 2	66°F19°C	57°F14°C	0.1 in2.6 mm· 20%	65%	Showers	WSW 10 mph16 km/h
DayMostly cloudy and mild, with a high of 66°F19°C and morning low of 57°F14°C. Breezy from the WSW at 10 to 11 mph17 to 18 km/h. 20% chance of showers throughout the day. NightMostly cloudy, with a low around 58°F14°C. Breezy from the SW at 10 mph15 km/h. 19% chance of showers throughout the night.
	SaturdayOct 3	65°F19°C	56°F13°C	0.13 in3.3 mm· 25%	61%	Showers	SSW 10 mph15 km/h
DayMostly cloudy and mild, with a high of 65°F19°C and morning low of 56°F13°C. Breezy from the SSW at 10 to 11 mph16 to 17 km/h. 25% chance of showers throughout the day. NightMostly cloudy, with a low around 56°F13°C. Breezy from the SSW at 9 to 10 mph15 to 16 km/h. 19% chance of showers throughout the night.
	SundayOct 4	65°F18°C	56°F14°C	0.17 in4.2 mm· 23%	64%	Showers	SW 10 mph16 km/h
DayMostly cloudy and mild, with a high of 65°F18°C and morning low of 56°F14°C. Breezy from the SW at 10 to 11 mph17 to 18 km/h. 23% chance of showers throughout the day. NightMostly cloudy, with a low around 57°F14°C. Breezy from the SW at 10 mph15 km/h. 23% chance of showers throughout the night.
	MondayOct 5	62°F17°C	55°F13°C	0.17 in4.2 mm· 26%	64%	Showers	WSW 10 mph16 km/h
DayMostly cloudy and mild, with a high of 62°F17°C and morning low of 55°F13°C. Breezy from the WSW at 11 mph17 km/h. 26% chance of showers throughout the day. NightMostly cloudy, with a low around 55°F13°C. Breezy from the WSW at 10 mph15 km/h. 21% chance of showers throughout the night.
	TuesdayOct 6	61°F16°C	53°F12°C	0.11 in2.8 mm· 26%	62%	Drizzle	W 10 mph16 km/h
DayMostly cloudy and mild, with a high of 61°F16°C and morning low of 53°F12°C. Breezy from the W at 10 to 11 mph17 to 18 km/h. 26% chance of drizzle throughout the day. Dry air. NightMostly cloudy, with a low around 53°F12°C. Breezy from the W at 9 to 10 mph15 to 15 km/h. 21% chance of drizzle throughout the night.

Nearby Cities

London15 mi24 km Tillsonburg24 mi38 km Strathroy26 mi41 km Woodstock33 mi53 km Norfolk County41 mi65 km Stratford43 mi69 km

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

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Coordinates: 42.7736°N, 81.1804°W·Elevation: 232m·Timezone: America/Toronto·Population: 38,909