Current Conditions

St. Thomas, Ontario

71°F22°C

Clear

Wind

SW 4 mph7 km/h

Humidity

52%

Cloud Cover

As of Thursday, July 23, 2026 at 7:47 PM EDT

Today's Outlook

Night

Mostly clear, with a low around 63°F17°C. Light wind from the SSW around 4 mph6 km/h.

7-Day Forecast

Day	Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
ThursdayJul 23	Clear	High 73°F23°C	Low 63°F17°C	Precip 0 in0 mm—	Cloud 4%	Wind WSW 5 mph7 km/h	Thursday: Mostly clear and warm, with a high of 73°F23°C. Light wind from the W around 5 mph9 km/h. Dry air. Thursday Night: Mostly clear, with a low around 63°F17°C. Light wind from the SSW around 4 mph6 km/h.
FridayJul 24	Clear	High 78°F25°C	Low 58°F15°C	Precip 0 in0 mm—	Cloud 24%	Wind ESE 5 mph7 km/h	Friday: Partly cloudy and warm, with a high of 78°F25°C and morning low of 63°F17°C. Light wind from the ESE around 6 mph9 km/h. Friday Night: Mostly clear, with a low around 58°F15°C. Light wind from the ESE around 4 mph6 km/h.
SaturdayJul 25	Drizzle	High 80°F27°C	Low 65°F18°C	Precip 0.01 in0.2 mm11%	Cloud 39%	Wind SSW 6 mph9 km/h	Saturday: Partly cloudy and warm, with a high of 80°F27°C and morning low of 68°F20°C. Breezy from the SSW at 5 to 8 mph9 to 13 km/h. 11% chance of drizzle. Saturday Night: Partly cloudy, with a low around 65°F18°C. Light wind from the S around 6 mph9 km/h.
SundayJul 26	Drizzle	High 81°F27°CFeels 84°F29°C	Low 67°F19°C	Precip 0.04 in0.9 mm27%	Cloud 33%	Wind WSW 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 14 km/h. 27% chance of drizzle throughout the day. Humid. Sunday Night: Partly cloudy, with a low around 67°F19°C. Light wind from the WSW around 5 mph9 km/h. 17% chance of drizzle in the evening.
MondayJul 27	Light Rain	High 80°F26°C	Low 69°F21°C	Precip 0.24 in6.2 mm45%	Cloud 71%	Wind SSW 7 mph11 km/h	Monday: Mostly cloudy and warm, with a high of 80°F26°C and morning low of 71°F22°C. Breezy from the SSW at 7 to 9 mph12 to 14 km/h. 45% chance of light rain throughout the day. Humid. Monday Night: Mostly cloudy, with a low around 69°F21°C. Breezy from the SSW at 6 to 8 mph10 to 12 km/h. 40% chance of showers throughout the night.
TuesdayJul 28	Rain	High 77°F25°C	Low 69°F21°C	Precip 0.41 in10.4 mm57%	Cloud 50%	Wind NW 10 mph15 km/h	Tuesday: Mostly cloudy and warm, with a high of 77°F25°C and morning low of 70°F21°C. Breezy from the NNW at 10 to 12 mph16 to 19 km/h. 47% chance of showers throughout the day. Humid. Tuesday Night: Partly cloudy, with a low around 69°F21°C. Breezy from the NW at 9 to 12 mph15 to 19 km/h. 57% chance of rain throughout the night.
WednesdayJul 29	Drizzle	High 77°F25°C	Low 64°F18°C	Precip 0.04 in1 mm18%	Cloud 27%	Wind NNW 10 mph16 km/h	Wednesday: Partly cloudy and warm, with a high of 77°F25°C and morning low of 66°F19°C. Breezy from the NNW at 10 to 12 mph17 to 19 km/h. 18% chance of drizzle in the afternoon. Wednesday Night: Mostly clear, with a low around 64°F18°C. Breezy from the NNW at 10 to 11 mph16 to 17 km/h. 12% chance of drizzle in the evening.

15-Day Forecast

	Day	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Condition	Wind (mph)
	ThursdayJul 23	73°F23°C	63°F17°C	0 in0 mm· —	4%	Clear	WSW 5 mph7 km/h
DayMostly clear and warm, with a high of 73°F23°C. Light wind from the W around 5 mph9 km/h. Dry air. NightMostly clear, with a low around 63°F17°C. Light wind from the SSW around 4 mph6 km/h.
	FridayJul 24	78°F25°C	58°F15°C	0 in0 mm· —	24%	Clear	ESE 5 mph7 km/h
DayPartly cloudy and warm, with a high of 78°F25°C and morning low of 63°F17°C. Light wind from the ESE around 6 mph9 km/h. NightMostly clear, with a low around 58°F15°C. Light wind from the ESE around 4 mph6 km/h.
	SaturdayJul 25	80°F27°C	65°F18°C	0.01 in0.2 mm· 11%	39%	Drizzle	SSW 6 mph9 km/h
DayPartly cloudy and warm, with a high of 80°F27°C and morning low of 68°F20°C. Breezy from the SSW at 5 to 8 mph9 to 13 km/h. 11% chance of drizzle. NightPartly cloudy, with a low around 65°F18°C. Light wind from the S around 6 mph9 km/h.
	SundayJul 26	81°F27°C Feels 84°F29°C	67°F19°C	0.04 in0.9 mm· 27%	33%	Drizzle	WSW 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 14 km/h. 27% chance of drizzle throughout the day. Humid. NightPartly cloudy, with a low around 67°F19°C. Light wind from the WSW around 5 mph9 km/h. 17% chance of drizzle in the evening.
	MondayJul 27	80°F26°C	69°F21°C	0.24 in6.2 mm· 45%	71%	Light Rain	SSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 80°F26°C and morning low of 71°F22°C. Breezy from the SSW at 7 to 9 mph12 to 14 km/h. 45% chance of light rain throughout the day. Humid. NightMostly cloudy, with a low around 69°F21°C. Breezy from the SSW at 6 to 8 mph10 to 12 km/h. 40% chance of showers throughout the night.
	TuesdayJul 28	77°F25°C	69°F21°C	0.41 in10.4 mm· 57%	50%	Rain	NW 10 mph15 km/h
DayMostly cloudy and warm, with a high of 77°F25°C and morning low of 70°F21°C. Breezy from the NNW at 10 to 12 mph16 to 19 km/h. 47% chance of showers throughout the day. Humid. NightPartly cloudy, with a low around 69°F21°C. Breezy from the NW at 9 to 12 mph15 to 19 km/h. 57% chance of rain throughout the night.
	WednesdayJul 29	77°F25°C	64°F18°C	0.04 in1 mm· 18%	27%	Drizzle	NNW 10 mph16 km/h
DayPartly cloudy and warm, with a high of 77°F25°C and morning low of 66°F19°C. Breezy from the NNW at 10 to 12 mph17 to 19 km/h. 18% chance of drizzle in the afternoon. NightMostly clear, with a low around 64°F18°C. Breezy from the NNW at 10 to 11 mph16 to 17 km/h. 12% chance of drizzle in the evening.
	ThursdayJul 30	80°F27°C	62°F17°C	0.02 in0.4 mm· 9%	22%	Clear	NW 8 mph13 km/h
DayPartly cloudy and warm, with a high of 80°F27°C and morning low of 65°F18°C. Breezy from the NW at 8 to 9 mph13 to 14 km/h. NightMostly clear, with a low around 62°F17°C. Breezy from the NNW at 8 mph12 km/h.
	FridayJul 31	82°F28°C	64°F18°C	0.02 in0.5 mm· 9%	31%	Clear	WSW 7 mph11 km/h
DayPartly cloudy and warm, with a high of 82°F28°C and morning low of 68°F20°C. Breezy from the WSW at 7 to 9 mph12 to 14 km/h. NightPartly cloudy, with a low around 64°F18°C. Breezy from the W at 7 mph11 km/h.
	SaturdayAug 1	82°F28°C	68°F20°C	0.08 in2.1 mm· 27%	40%	Drizzle	WSW 7 mph12 km/h
DayPartly cloudy and warm, with a high of 82°F28°C and morning low of 71°F21°C. Breezy from the WSW at 8 to 9 mph13 to 15 km/h. 27% chance of drizzle throughout the day. NightPartly cloudy, with a low around 68°F20°C. Breezy from the W at 7 mph11 km/h. 16% chance of drizzle throughout the night.
	SundayAug 2	81°F27°C	67°F19°C	0.05 in1.3 mm· 17%	42%	Drizzle	W 7 mph11 km/h
DayPartly cloudy and warm, with a high of 81°F27°C and morning low of 69°F21°C. Breezy from the WSW at 7 to 8 mph11 to 13 km/h. 17% chance of drizzle throughout the day. NightPartly cloudy, with a low around 67°F19°C. Breezy from the WNW at 7 mph11 km/h. 11% chance of drizzle overnight.
	MondayAug 3	82°F28°C	68°F20°C	0.05 in1.3 mm· 14%	45%	Drizzle	SW 8 mph13 km/h
DayPartly cloudy and warm, with a high of 82°F28°C and morning low of 70°F21°C. Breezy from the SW at 9 to 10 mph14 to 16 km/h. 14% chance of drizzle throughout the day. NightPartly cloudy, with a low around 68°F20°C. Breezy from the SW at 8 mph12 km/h.
	TuesdayAug 4	81°F27°C	70°F21°C	0.13 in3.4 mm· 27%	58%	Showers	SW 9 mph14 km/h
DayMostly cloudy and warm, with a high of 81°F27°C and morning low of 71°F22°C. Breezy from the SW at 10 to 11 mph15 to 17 km/h. 27% chance of showers throughout the day. Humid. NightMostly cloudy, with a low around 70°F21°C. Breezy from the SW at 8 mph13 km/h. 21% chance of drizzle throughout the night.
	WednesdayAug 5	79°F26°C	69°F20°C	0.15 in3.9 mm· 28%	55%	Showers	WSW 9 mph14 km/h
DayMostly cloudy and warm, with a high of 79°F26°C and morning low of 70°F21°C. Breezy from the WSW at 10 mph15 km/h. 28% chance of showers throughout the day. NightMostly cloudy, with a low around 69°F20°C. Breezy from the WSW at 8 mph13 km/h. 23% chance of showers throughout the night.
	ThursdayAug 6	79°F26°C	67°F19°C	0.16 in4.1 mm· 22%	48%	Showers	WSW 8 mph13 km/h
DayMostly cloudy and warm, with a high of 79°F26°C and morning low of 68°F20°C. Breezy from the WSW at 9 to 10 mph14 to 15 km/h. 22% chance of showers throughout the day. NightPartly cloudy, with a low around 67°F19°C. Breezy from the W at 8 mph12 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.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

Pattern	Example	Description
/weather/{country}/{city}/	/weather/united-states/san-francisco/	City forecast (canonical URL)
/weather/{city}/	/weather/tokyo/	Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}/	/weather/united-states/california/san-francisco/	With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}	/weather/nearby?lat=48.1&lon=11.5	Find nearest city by coordinates
/weather/{country}/	/weather/germany/	Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

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