Current Conditions

Sarnia, Ontario

73°F23°C

Clear

Wind

N 3 mph5 km/h

Humidity

40%

Cloud Cover

10%

As of Thursday, July 23, 2026 at 12:59 PM EDT

Today's Outlook

Day

Mostly clear and warm, with a high of 76°F24°C and morning low of 61°F16°C. Light wind from the NNW around 4 mph7 km/h. Dry air.

Night

Mostly clear, with a low around 66°F19°C. Breezy from the SSE at 6 to 7 mph10 to 12 km/h.

7-Day Forecast

Day	Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
ThursdayJul 23	Clear	High 76°F24°C	Low 61°F16°C	Precip 0 in0 mm—	Cloud 4%	Wind NW 5 mph8 km/h	Thursday: Mostly clear and warm, with a high of 76°F24°C and morning low of 61°F16°C. Light wind from the NNW around 4 mph7 km/h. Dry air. Thursday Night: Mostly clear, with a low around 66°F19°C. Breezy from the SSE at 6 to 7 mph10 to 12 km/h.
FridayJul 24	Clear	High 79°F26°C	Low 60°F16°C	Precip 0 in0 mm—	Cloud 28%	Wind SSE 5 mph8 km/h	Friday: Partly cloudy and warm, with a high of 79°F26°C and morning low of 64°F18°C. Light wind from the SE around 4 mph7 km/h. Friday Night: Mostly clear, with a low around 60°F16°C. Light wind from the S around 6 mph9 km/h.
SaturdayJul 25	Clear	High 82°F28°C	Low 63°F17°C	Precip 0 in0 mm—	Cloud 28%	Wind SSW 5 mph8 km/h	Saturday: Partly cloudy and warm, with a high of 82°F28°C and morning low of 67°F19°C. Light wind from the SW around 5 mph8 km/h. Saturday Night: Mostly clear, with a low around 63°F17°C. Breezy from the SSW at 6 to 7 mph9 to 12 km/h.
SundayJul 26	Drizzle	High 83°F28°C	Low 70°F21°C	Precip 0.04 in1.1 mm20%	Cloud 38%	Wind W 6 mph9 km/h	Sunday: Partly cloudy and warm, with a high of 83°F28°C and morning low of 71°F22°C. Light wind from the NW around 6 mph9 km/h. 20% chance of drizzle throughout the day. Humid. Sunday Night: Partly cloudy, with a low around 70°F21°C. Light wind from the SW around 6 mph10 km/h. 12% chance of drizzle in the evening.
MondayJul 27	Showers	High 83°F28°CFeels 86°F30°C	Low 71°F22°C	Precip 0.17 in4.4 mm42%	Cloud 62%	Wind SSW 7 mph11 km/h	Monday: Mostly cloudy and warm, with a high of 83°F28°C and morning low of 72°F22°C. Breezy from the SSW at 7 to 8 mph12 to 13 km/h. 24% chance of drizzle throughout the day. Humid. Monday Night: Mostly cloudy, with a low around 71°F22°C. Breezy from the S at 7 to 8 mph11 to 13 km/h. 42% chance of showers throughout the night.
TuesdayJul 28	Showers	High 76°F25°C	Low 69°F20°C	Precip 0.25 in6.3 mm51%	Cloud 43%	Wind N 10 mph17 km/h	Tuesday: Partly cloudy and warm, with a high of 76°F25°C and morning low of 72°F22°C. Breezy from the N at 11 to 13 mph18 to 21 km/h. 36% chance of showers throughout the day. Humid. Tuesday Night: Partly cloudy, with a low around 69°F20°C. Breezy from the NNW at 10 to 12 mph15 to 19 km/h. 51% chance of showers throughout the night.
WednesdayJul 29	Clear	High 75°F24°C	Low 65°F18°C	Precip 0.02 in0.4 mm8%	Cloud 21%	Wind N 9 mph15 km/h	Wednesday: Mostly clear and warm, with a high of 75°F24°C and morning low of 67°F19°C. Breezy from the N at 10 to 11 mph16 to 17 km/h. Wednesday Night: Mostly clear, with a low around 65°F18°C. Breezy from the N at 8 to 9 mph14 to 15 km/h.

15-Day Forecast

	Day	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Condition	Wind (mph)
	ThursdayJul 23	76°F24°C	61°F16°C	0 in0 mm· —	4%	Clear	NW 5 mph8 km/h
DayMostly clear and warm, with a high of 76°F24°C and morning low of 61°F16°C. Light wind from the NNW around 4 mph7 km/h. Dry air. NightMostly clear, with a low around 66°F19°C. Breezy from the SSE at 6 to 7 mph10 to 12 km/h.
	FridayJul 24	79°F26°C	60°F16°C	0 in0 mm· —	28%	Clear	SSE 5 mph8 km/h
DayPartly cloudy and warm, with a high of 79°F26°C and morning low of 64°F18°C. Light wind from the SE around 4 mph7 km/h. NightMostly clear, with a low around 60°F16°C. Light wind from the S around 6 mph9 km/h.
	SaturdayJul 25	82°F28°C	63°F17°C	0 in0 mm· —	28%	Clear	SSW 5 mph8 km/h
DayPartly cloudy and warm, with a high of 82°F28°C and morning low of 67°F19°C. Light wind from the SW around 5 mph8 km/h. NightMostly clear, with a low around 63°F17°C. Breezy from the SSW at 6 to 7 mph9 to 12 km/h.
	SundayJul 26	83°F28°C	70°F21°C	0.04 in1.1 mm· 20%	38%	Drizzle	W 6 mph9 km/h
DayPartly cloudy and warm, with a high of 83°F28°C and morning low of 71°F22°C. Light wind from the NW around 6 mph9 km/h. 20% chance of drizzle throughout the day. Humid. NightPartly cloudy, with a low around 70°F21°C. Light wind from the SW around 6 mph10 km/h. 12% chance of drizzle in the evening.
	MondayJul 27	83°F28°C Feels 86°F30°C	71°F22°C	0.17 in4.4 mm· 42%	62%	Showers	SSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 83°F28°C and morning low of 72°F22°C. Breezy from the SSW at 7 to 8 mph12 to 13 km/h. 24% chance of drizzle throughout the day. Humid. NightMostly cloudy, with a low around 71°F22°C. Breezy from the S at 7 to 8 mph11 to 13 km/h. 42% chance of showers throughout the night.
	TuesdayJul 28	76°F25°C	69°F20°C	0.25 in6.3 mm· 51%	43%	Showers	N 10 mph17 km/h
DayPartly cloudy and warm, with a high of 76°F25°C and morning low of 72°F22°C. Breezy from the N at 11 to 13 mph18 to 21 km/h. 36% chance of showers throughout the day. Humid. NightPartly cloudy, with a low around 69°F20°C. Breezy from the NNW at 10 to 12 mph15 to 19 km/h. 51% chance of showers throughout the night.
	WednesdayJul 29	75°F24°C	65°F18°C	0.02 in0.4 mm· 8%	21%	Clear	N 9 mph15 km/h
DayMostly clear and warm, with a high of 75°F24°C and morning low of 67°F19°C. Breezy from the N at 10 to 11 mph16 to 17 km/h. NightMostly clear, with a low around 65°F18°C. Breezy from the N at 8 to 9 mph14 to 15 km/h.
	ThursdayJul 30	79°F26°C	64°F18°C	0.02 in0.6 mm· 9%	27%	Clear	N 7 mph11 km/h
DayPartly cloudy and warm, with a high of 79°F26°C and morning low of 67°F19°C. Breezy from the N at 7 to 8 mph12 to 13 km/h. NightMostly clear, with a low around 64°F18°C. Breezy from the NNE at 7 mph11 km/h.
	FridayJul 31	82°F28°C	67°F19°C	0.09 in2.4 mm· 23%	36%	Showers	SW 7 mph11 km/h
DayPartly cloudy and warm, with a high of 82°F28°C and morning low of 69°F21°C. Breezy from the WSW at 7 to 8 mph12 to 12 km/h. 23% chance of showers throughout the day. NightPartly cloudy, with a low around 67°F19°C. Breezy from the SW at 7 mph11 km/h. 22% chance of showers throughout the night.
	SaturdayAug 1	80°F27°C	68°F20°C	0.07 in1.8 mm· 20%	39%	Drizzle	NW 8 mph12 km/h
DayPartly cloudy and warm, with a high of 80°F27°C and morning low of 70°F21°C. Breezy from the NW at 8 to 9 mph13 to 14 km/h. 20% chance of drizzle throughout the day. NightPartly cloudy, with a low around 68°F20°C. Breezy from the NW at 7 to 8 mph12 to 12 km/h. 20% chance of drizzle in the evening.
	SundayAug 2	80°F27°C	67°F19°C	0.06 in1.4 mm· 18%	40%	Drizzle	NW 8 mph12 km/h
DayPartly cloudy and warm, with a high of 80°F27°C and morning low of 69°F20°C. Breezy from the NW at 8 to 9 mph13 to 14 km/h. 18% chance of drizzle throughout the day. NightPartly cloudy, with a low around 67°F19°C. Breezy from the NW at 7 to 8 mph12 to 12 km/h. 16% chance of drizzle throughout the night.
	MondayAug 3	82°F28°C	68°F20°C	0.06 in1.5 mm· 18%	45%	Drizzle	SW 8 mph13 km/h
DayPartly cloudy and warm, with a high of 82°F28°C and morning low of 69°F21°C. Breezy from the SW at 8 to 9 mph13 to 14 km/h. 15% chance of drizzle throughout the day. NightPartly cloudy, with a low around 68°F20°C. Breezy from the SSW at 8 mph12 km/h. 18% chance of drizzle throughout the night.
	TuesdayAug 4	82°F28°C	69°F21°C	0.09 in2.3 mm· 16%	54%	Drizzle	SW 8 mph13 km/h
DayMostly 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. 15% chance of drizzle throughout the day. NightMostly cloudy, with a low around 69°F21°C. Breezy from the SW at 8 mph13 km/h. 16% chance of drizzle throughout the night.
	WednesdayAug 5	80°F27°C	69°F21°C	0.11 in2.7 mm· 17%	49%	Drizzle	W 8 mph13 km/h
DayMostly cloudy and warm, with a high of 80°F27°C and morning low of 70°F21°C. Breezy from the W at 8 to 9 mph13 to 15 km/h. 16% chance of drizzle throughout the day. NightPartly cloudy, with a low around 69°F21°C. Breezy from the WSW at 8 mph13 km/h. 17% chance of drizzle throughout the night.
	ThursdayAug 6	79°F26°C	67°F20°C	0.13 in3.2 mm· 20%	46%	Showers	W 8 mph12 km/h
DayMostly cloudy and warm, with a high of 79°F26°C and morning low of 69°F20°C. Breezy from the W at 8 to 9 mph13 to 14 km/h. 18% chance of showers throughout the day. NightPartly cloudy, with a low around 67°F20°C. Breezy from the W at 7 to 8 mph12 to 12 km/h. 20% chance of drizzle throughout the night.

Nearby Cities

Strathroy40 mi64 km Chatham41 mi65 km Tecumseh52 mi83 km Windsor56 mi91 km London59 mi95 km LaSalle61 mi98 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: 42.9787°N, 82.4041°W·Elevation: 185m·Timezone: America/Toronto·Population: 72,125