Current Conditions

St. Thomas, Ontario

64°F18°C

Clear

Wind

SSW 4 mph7 km/h

Humidity

70%

Cloud Cover

As of Thursday, July 23, 2026 at 11:42 PM EDT

Today's Outlook

Night

Mostly clear, with a low around 59°F15°C. Light wind from the SE around 4 mph6 km/h.

7-Day Forecast

Day	Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
FridayJul 24	Clear	High 77°F25°C	Low 59°F15°C	Precip 0 in0 mm—	Cloud 26%	Wind SE 5 mph7 km/h	Friday: Partly cloudy and warm, with a high of 77°F25°C and morning low of 63°F17°C. Light wind from the SE around 5 mph9 km/h. Friday Night: Mostly clear, with a low around 59°F15°C. Light wind from the SE around 4 mph6 km/h.
SaturdayJul 25	Clear	High 79°F26°C	Low 65°F18°C	Precip 0 in0.1 mm4%	Cloud 37%	Wind SW 5 mph9 km/h	Saturday: Partly cloudy and warm, with a high of 79°F26°C and morning low of 68°F20°C. Breezy from the SW at 6 to 9 mph9 to 14 km/h. Saturday Night: Partly cloudy, with a low around 65°F18°C. Breezy from the SSW at 5 to 7 mph9 to 12 km/h.
SundayJul 26	Drizzle	High 81°F27°CFeels 84°F29°C	Low 67°F19°C	Precip 0.04 in1 mm27%	Cloud 36%	Wind SW 6 mph10 km/h	Sunday: Partly cloudy and warm, with a high of 81°F27°C and morning low of 70°F21°C. Breezy from the WSW at 7 to 9 mph11 to 15 km/h. 27% chance of drizzle in the afternoon. Humid. Sunday Night: Partly cloudy, with a low around 67°F19°C. Light wind from the SW around 6 mph9 km/h. 19% chance of drizzle in the evening.
MondayJul 27	Showers	High 80°F27°C	Low 70°F21°C	Precip 0.22 in5.7 mm46%	Cloud 61%	Wind SW 7 mph11 km/h	Monday: Mostly cloudy and warm, with a high of 80°F27°C and morning low of 71°F22°C. Breezy from the SW at 7 to 9 mph12 to 14 km/h. 46% chance of showers throughout the day. Humid. Monday Night: Mostly cloudy, with a low around 70°F21°C. Light wind from the SW around 6 mph10 km/h. 28% chance of showers throughout the night.
TuesdayJul 28	Showers	High 79°F26°C	Low 69°F21°C	Precip 0.26 in6.7 mm38%	Cloud 41%	Wind NNW 8 mph13 km/h	Tuesday: Partly cloudy and warm, with a high of 79°F26°C and morning low of 70°F21°C. Breezy from the NNW at 8 to 10 mph13 to 17 km/h. 38% chance of showers throughout the day. Humid. Tuesday Night: Partly cloudy, with a low around 69°F21°C. Breezy from the NNW at 8 to 10 mph13 to 17 km/h. 38% chance of showers throughout the night.
WednesdayJul 29	Clear	High 79°F26°C	Low 64°F18°C	Precip 0.02 in0.5 mm8%	Cloud 20%	Wind NNW 9 mph14 km/h	Wednesday: Partly cloudy and warm, with a high of 79°F26°C and morning low of 67°F19°C. Breezy from the NNW at 9 to 10 mph14 to 16 km/h. Wednesday Night: Mostly clear, with a low around 64°F18°C. Breezy from the NNW at 9 to 10 mph15 to 16 km/h.
ThursdayJul 30	Clear	High 81°F27°C	Low 63°F17°C	Precip 0.02 in0.4 mm5%	Cloud 21%	Wind NW 7 mph12 km/h	Thursday: Mostly clear and warm, with a high of 81°F27°C and morning low of 66°F19°C. Breezy from the NW at 7 to 8 mph11 to 13 km/h. Thursday Night: Mostly clear, with a low around 63°F17°C. Breezy from the NNW at 7 to 8 mph12 to 13 km/h.

15-Day Forecast

	Day	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Condition	Wind (mph)
	FridayJul 24	77°F25°C	59°F15°C	0 in0 mm· —	26%	Clear	SE 5 mph7 km/h
DayPartly cloudy and warm, with a high of 77°F25°C and morning low of 63°F17°C. Light wind from the SE around 5 mph9 km/h. NightMostly clear, with a low around 59°F15°C. Light wind from the SE around 4 mph6 km/h.
	SaturdayJul 25	79°F26°C	65°F18°C	0 in0.1 mm· 4%	37%	Clear	SW 5 mph9 km/h
DayPartly cloudy and warm, with a high of 79°F26°C and morning low of 68°F20°C. Breezy from the SW at 6 to 9 mph9 to 14 km/h. NightPartly cloudy, with a low around 65°F18°C. Breezy from the SSW at 5 to 7 mph9 to 12 km/h.
	SundayJul 26	81°F27°C Feels 84°F29°C	67°F19°C	0.04 in1 mm· 27%	36%	Drizzle	SW 6 mph10 km/h
DayPartly cloudy and warm, with a high of 81°F27°C and morning low of 70°F21°C. Breezy from the WSW at 7 to 9 mph11 to 15 km/h. 27% chance of drizzle in the afternoon. Humid. NightPartly cloudy, with a low around 67°F19°C. Light wind from the SW around 6 mph9 km/h. 19% chance of drizzle in the evening.
	MondayJul 27	80°F27°C	70°F21°C	0.22 in5.7 mm· 46%	61%	Showers	SW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 80°F27°C and morning low of 71°F22°C. Breezy from the SW at 7 to 9 mph12 to 14 km/h. 46% chance of showers throughout the day. Humid. NightMostly cloudy, with a low around 70°F21°C. Light wind from the SW around 6 mph10 km/h. 28% chance of showers throughout the night.
	TuesdayJul 28	79°F26°C	69°F21°C	0.26 in6.7 mm· 38%	41%	Showers	NNW 8 mph13 km/h
DayPartly cloudy and warm, with a high of 79°F26°C and morning low of 70°F21°C. Breezy from the NNW at 8 to 10 mph13 to 17 km/h. 38% chance of showers throughout the day. Humid. NightPartly cloudy, with a low around 69°F21°C. Breezy from the NNW at 8 to 10 mph13 to 17 km/h. 38% chance of showers throughout the night.
	WednesdayJul 29	79°F26°C	64°F18°C	0.02 in0.5 mm· 8%	20%	Clear	NNW 9 mph14 km/h
DayPartly cloudy and warm, with a high of 79°F26°C and morning low of 67°F19°C. Breezy from the NNW at 9 to 10 mph14 to 16 km/h. NightMostly clear, with a low around 64°F18°C. Breezy from the NNW at 9 to 10 mph15 to 16 km/h.
	ThursdayJul 30	81°F27°C	63°F17°C	0.02 in0.4 mm· 5%	21%	Clear	NW 7 mph12 km/h
DayMostly clear and warm, with a high of 81°F27°C and morning low of 66°F19°C. Breezy from the NW at 7 to 8 mph11 to 13 km/h. NightMostly clear, with a low around 63°F17°C. Breezy from the NNW at 7 to 8 mph12 to 13 km/h.
	FridayJul 31	81°F27°C	66°F19°C	0.06 in1.4 mm· 15%	43%	Drizzle	SW 8 mph12 km/h
DayPartly cloudy and warm, with a high of 81°F27°C and morning low of 69°F21°C. Breezy from the SW at 8 to 10 mph13 to 16 km/h. 15% chance of drizzle throughout the day. NightPartly cloudy, with a low around 66°F19°C. Breezy from the WSW at 7 to 8 mph11 to 12 km/h. 14% chance of drizzle throughout the night.
	SaturdayAug 1	81°F27°C	68°F20°C	0.09 in2.3 mm· 22%	43%	Drizzle	W 8 mph12 km/h
DayPartly cloudy and warm, with a high of 81°F27°C and morning low of 70°F21°C. Breezy from the W at 8 to 9 mph13 to 15 km/h. 22% chance of drizzle throughout the day. NightPartly cloudy, with a low around 68°F20°C. Breezy from the W at 7 mph11 km/h. 21% chance of drizzle throughout the night.
	SundayAug 2	80°F27°C	67°F19°C	0.07 in1.7 mm· 19%	43%	Drizzle	W 7 mph12 km/h
DayPartly cloudy and warm, with a high of 80°F27°C and morning low of 69°F20°C. Breezy from the W at 8 to 9 mph12 to 15 km/h. 19% chance of drizzle in the afternoon. NightPartly cloudy, with a low around 67°F19°C. Breezy from the WNW at 7 mph11 km/h. 16% chance of drizzle throughout the night.
	MondayAug 3	80°F27°C	66°F19°C	0.06 in1.5 mm· 14%	44%	Drizzle	SW 8 mph12 km/h
DayPartly cloudy and warm, with a high of 80°F27°C and morning low of 69°F21°C. Breezy from the SW at 8 to 9 mph13 to 15 km/h. 14% chance of drizzle throughout the day. NightPartly cloudy, with a low around 66°F19°C. Breezy from the SW at 7 mph11 km/h. 13% chance of drizzle throughout the night.
	TuesdayAug 4	80°F27°C	69°F20°C	0.16 in4 mm· 25%	55%	Showers	SW 9 mph14 km/h
DayMostly cloudy and warm, with a high of 80°F27°C and morning low of 71°F21°C. Breezy from the SW at 9 to 10 mph15 to 17 km/h. 25% chance of showers throughout the day. NightMostly cloudy, with a low around 69°F20°C. Breezy from the SW at 8 mph13 km/h. 24% chance of showers throughout the night.
	WednesdayAug 5	78°F26°C	68°F20°C	0.13 in3.3 mm· 23%	53%	Showers	WSW 9 mph14 km/h
DayMostly cloudy and warm, with a high of 78°F26°C and morning low of 69°F20°C. Breezy from the WSW at 9 to 10 mph15 to 17 km/h. 23% chance of drizzle throughout the day. NightPartly cloudy, with a low around 68°F20°C. Breezy from the WSW at 8 mph13 km/h. 22% chance of showers throughout the night.
	ThursdayAug 6	78°F26°C	66°F19°C	0.09 in2.4 mm· 18%	44%	Drizzle	WSW 8 mph13 km/h
DayPartly cloudy and warm, with a high of 78°F26°C and morning low of 68°F20°C. Breezy from the WSW at 9 mph14 km/h. 18% chance of drizzle throughout the day. NightPartly cloudy, with a low around 66°F19°C. Breezy from the W at 7 mph12 km/h. 15% chance of drizzle throughout the night.
	FridayAug 7	78°F25°C	65°F18°C	0.1 in2.5 mm· 19%	48%	Showers	WSW 8 mph13 km/h
DayMostly cloudy and warm, with a high of 78°F25°C and morning low of 67°F19°C. Breezy from the WSW at 9 to 10 mph14 to 15 km/h. 19% chance of drizzle throughout the day. NightPartly cloudy, with a low around 65°F18°C. Breezy from the WSW at 7 to 8 mph12 to 13 km/h. 18% chance of showers 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