Current Conditions

Cornwall, Ontario

73°F23°C

Rain

Wind

SSE 6 mph9 km/h

Humidity

78%

Cloud Cover

98%

As of Wednesday, September 2, 2026 at 10:34 AM EDT

Today's Outlook

Day

Overcast and warm, with a high of 77°F25°C and morning low of 65°F18°C. Breezy from the S at 6 to 7 mph9 to 11 km/h. 90% chance of light rain in the afternoon. Humid.

Night

Overcast, with a low around 69°F20°C. Breezy from the S at 8 mph12 km/h. 100% chance of rain throughout the night.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Rain	High 77°F25°C	Low 65°F18°C	Precip 0.67 in16.9 mm100%	Cloud 99%	Wind S 6 mph10 km/h	Wednesday: Overcast and warm, with a high of 77°F25°C and morning low of 65°F18°C. Breezy from the S at 6 to 7 mph9 to 11 km/h. 90% chance of light rain in the afternoon. Humid. Wednesday Night: Overcast, with a low around 69°F20°C. Breezy from the S at 8 mph12 km/h. 100% chance of rain throughout the night.
Heavy Rain	High 77°F25°C	Low 67°F19°C	Precip 0.5 in12.8 mm97%	Cloud 68%	Wind WSW 6 mph10 km/h	Thursday: Mostly cloudy and warm, with a high of 77°F25°C and morning low of 67°F19°C. Breezy from the WSW at 7 mph11 km/h. 37% chance of drizzle throughout the day. Thursday Night: Mostly cloudy, with a low around 67°F19°C. Light wind from the SW around 6 mph9 km/h. 97% chance of heavy rain overnight.
Drizzle	High 74°F24°C	Low 63°F17°C	Precip 0.03 in0.7 mm34%	Cloud 39%	Wind WNW 6 mph10 km/h	Friday: Partly cloudy and warm, with a high of 74°F24°C and morning low of 64°F18°C. Breezy from the WNW at 7 to 9 mph11 to 14 km/h. 34% chance of drizzle throughout the day. Friday Night: Partly cloudy, with a low around 63°F17°C. Light wind from the WNW around 5 mph9 km/h.
Drizzle	High 70°F21°C	Low 59°F15°C	Precip 0.04 in1.1 mm60%	Cloud 47%	Wind NNE 6 mph10 km/h	Saturday: Mostly cloudy and warm, with a high of 70°F21°C and morning low of 62°F17°C. Breezy from the NNE at 6 to 7 mph10 to 11 km/h. 60% chance of drizzle throughout the day. Saturday Night: Partly cloudy, with a low around 59°F15°C. Light wind from the N around 5 mph9 km/h. 11% chance of drizzle in the evening.
Clear	High 74°F23°C	Low 53°F12°C	Precip 0 in0 mm—	Cloud 24%	Wind NNE 5 mph8 km/h	Sunday: Partly cloudy and warm, with a high of 74°F23°C and morning low of 56°F13°C. Light wind from the NNE around 5 mph8 km/h. Sunday Night: Mostly clear, with a low around 53°F12°C. Light wind from the NNE around 5 mph7 km/h.
Drizzle	High 76°F24°C	Low 52°F11°C	Precip 0.02 in0.4 mm12%	Cloud 51%	Wind WSW 5 mph8 km/h	Monday: Mostly cloudy and warm, with a high of 76°F24°C and morning low of 55°F13°C. Light wind from the W around 5 mph8 km/h. Monday Night: Partly cloudy, with a low around 52°F11°C. Light wind from the WSW around 5 mph8 km/h. 12% chance of drizzle overnight.
Drizzle	High 71°F22°C	Low 57°F14°C	Precip 0.04 in1 mm19%	Cloud 68%	Wind WSW 5 mph8 km/h	Tuesday: Mostly cloudy and warm, with a high of 71°F22°C and morning low of 58°F14°C. Light wind from the NNW around 5 mph8 km/h. 16% chance of drizzle in the morning. Tuesday Night: Mostly cloudy, with a low around 57°F14°C. Light wind from the SSW around 6 mph9 km/h. 19% chance of drizzle overnight.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdaySep 2	77°F25°C	65°F18°C	0.67 in16.9 mm· 100%	99%	Rain	S 6 mph10 km/h
DayOvercast and warm, with a high of 77°F25°C and morning low of 65°F18°C. Breezy from the S at 6 to 7 mph9 to 11 km/h. 90% chance of light rain in the afternoon. Humid. NightOvercast, with a low around 69°F20°C. Breezy from the S at 8 mph12 km/h. 100% chance of rain throughout the night.
	ThursdaySep 3	77°F25°C	67°F19°C	0.5 in12.8 mm· 97%	68%	Heavy Rain	WSW 6 mph10 km/h
DayMostly cloudy and warm, with a high of 77°F25°C and morning low of 67°F19°C. Breezy from the WSW at 7 mph11 km/h. 37% chance of drizzle throughout the day. NightMostly cloudy, with a low around 67°F19°C. Light wind from the SW around 6 mph9 km/h. 97% chance of heavy rain overnight.
	FridaySep 4	74°F24°C	63°F17°C	0.03 in0.7 mm· 34%	39%	Drizzle	WNW 6 mph10 km/h
DayPartly cloudy and warm, with a high of 74°F24°C and morning low of 64°F18°C. Breezy from the WNW at 7 to 9 mph11 to 14 km/h. 34% chance of drizzle throughout the day. NightPartly cloudy, with a low around 63°F17°C. Light wind from the WNW around 5 mph9 km/h.
	SaturdaySep 5	70°F21°C	59°F15°C	0.04 in1.1 mm· 60%	47%	Drizzle	NNE 6 mph10 km/h
DayMostly cloudy and warm, with a high of 70°F21°C and morning low of 62°F17°C. Breezy from the NNE at 6 to 7 mph10 to 11 km/h. 60% chance of drizzle throughout the day. NightPartly cloudy, with a low around 59°F15°C. Light wind from the N around 5 mph9 km/h. 11% chance of drizzle in the evening.
	SundaySep 6	74°F23°C	53°F12°C	0 in0 mm· —	24%	Clear	NNE 5 mph8 km/h
DayPartly cloudy and warm, with a high of 74°F23°C and morning low of 56°F13°C. Light wind from the NNE around 5 mph8 km/h. NightMostly clear, with a low around 53°F12°C. Light wind from the NNE around 5 mph7 km/h.
	MondaySep 7	76°F24°C	52°F11°C	0.02 in0.4 mm· 12%	51%	Drizzle	WSW 5 mph8 km/h
DayMostly cloudy and warm, with a high of 76°F24°C and morning low of 55°F13°C. Light wind from the W around 5 mph8 km/h. NightPartly cloudy, with a low around 52°F11°C. Light wind from the WSW around 5 mph8 km/h. 12% chance of drizzle overnight.
	TuesdaySep 8	71°F22°C	57°F14°C	0.04 in1 mm· 19%	68%	Drizzle	WSW 5 mph8 km/h
DayMostly cloudy and warm, with a high of 71°F22°C and morning low of 58°F14°C. Light wind from the NNW around 5 mph8 km/h. 16% chance of drizzle in the morning. NightMostly cloudy, with a low around 57°F14°C. Light wind from the SSW around 6 mph9 km/h. 19% chance of drizzle overnight.
	WednesdaySep 9	74°F23°C	59°F15°C	0.19 in4.9 mm· 38%	80%	Light Rain	SSW 8 mph12 km/h
DayOvercast and warm, with a high of 74°F23°C and morning low of 61°F16°C. Breezy from the SSW at 8 mph12 km/h. 36% chance of light rain throughout the day. NightMostly cloudy, with a low around 59°F15°C. Breezy from the SSW at 8 to 9 mph12 to 15 km/h. 38% chance of light rain throughout the night.
	ThursdaySep 10	76°F25°C	67°F19°C	0.26 in6.5 mm· 40%	69%	Showers	WSW 9 mph15 km/h
DayMostly cloudy and warm, with a high of 76°F25°C and morning low of 68°F20°C. Breezy from the WSW at 10 to 11 mph16 to 17 km/h. 37% chance of light rain throughout the day. NightMostly cloudy, with a low around 67°F19°C. Breezy from the WSW at 9 mph14 km/h. 40% chance of showers throughout the night.
	FridaySep 11	72°F22°C	61°F16°C	0.12 in3.1 mm· 21%	58%	Showers	W 7 mph11 km/h
DayMostly cloudy and warm, with a high of 72°F22°C and morning low of 62°F17°C. Breezy from the W at 7 to 8 mph12 to 13 km/h. 21% chance of showers throughout the day. NightMostly cloudy, with a low around 61°F16°C. Breezy from the W at 7 mph11 km/h. 19% chance of showers throughout the night.
	SaturdaySep 12	71°F22°C	58°F14°C	0.2 in5.2 mm· 28%	64%	Showers	WSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 71°F22°C and morning low of 59°F15°C. Breezy from the WSW at 7 to 8 mph11 to 12 km/h. 28% chance of showers throughout the day. NightMostly cloudy, with a low around 58°F14°C. Breezy from the SW at 7 mph11 km/h. 28% chance of showers throughout the night.
	SundaySep 13	70°F21°C	59°F15°C	0.21 in5.3 mm· 34%	68%	Showers	WSW 7 mph12 km/h
DayMostly cloudy and warm, with a high of 70°F21°C and morning low of 60°F16°C. Breezy from the WSW at 8 mph12 km/h. 34% chance of light rain throughout the day. NightMostly cloudy, with a low around 59°F15°C. Breezy from the SW at 7 mph12 km/h. 30% chance of showers throughout the night.
	MondaySep 14	69°F21°C	57°F14°C	0.16 in4 mm· 25%	62%	Showers	WSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 69°F21°C and morning low of 58°F15°C. Breezy from the WSW at 7 to 8 mph12 to 12 km/h. 25% chance of drizzle throughout the day. NightMostly cloudy, with a low around 57°F14°C. Breezy from the SW at 7 mph11 km/h. 23% chance of showers throughout the night.
	TuesdaySep 15	68°F20°C	55°F13°C	0.17 in4.3 mm· 23%	61%	Showers	WSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 68°F20°C and morning low of 56°F14°C. Breezy from the WSW at 7 to 8 mph11 to 12 km/h. 23% chance of showers throughout the day. NightMostly cloudy, with a low around 55°F13°C. Breezy from the SW at 7 mph11 km/h. 22% chance of showers throughout the night.
	WednesdaySep 16	67°F19°C	54°F12°C	0.17 in4.3 mm· 22%	56%	Showers	WSW 7 mph11 km/h
DayMostly cloudy and mild, with a high of 67°F19°C and morning low of 55°F13°C. Breezy from the W at 7 mph11 km/h. 22% chance of showers throughout the day. NightPartly cloudy, with a low around 54°F12°C. Breezy from the SW at 6 to 7 mph10 to 11 km/h. 19% chance of showers throughout the night.

Nearby Cities

Les Coteaux30 mi49 km Salaberry-de-Valleyfield33 mi53 km Saint-Lazare39 mi63 km Vaudreuil-Dorion43 mi69 km Clarence-Rockland46 mi74 km Orléans48 mi78 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: 45.0181°N, 74.7281°W·Elevation: 59m·Timezone: America/Toronto·Population: 48,821