Current Conditions

Cornwall, Ontario

70°F21°C

Light Rain

Wind

NNE 3 mph5 km/h

Humidity

70%

Cloud Cover

93%

As of Tuesday, September 8, 2026 at 2:09 PM EDT

Today's Outlook

Day

Overcast and warm, with a high of 72°F22°C and morning low of 60°F15°C. Light wind from the NNE around 3 mph4 km/h. 89% chance of light rain throughout the day.

Night

Overcast, with a low around 60°F15°C. Light wind from the ESE around 5 mph8 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Light Rain	High 72°F22°C	Low 60°F15°C	Precip 0.1 in2.5 mm89%	Cloud 92%	Wind ESE 3 mph5 km/h	Tuesday: Overcast and warm, with a high of 72°F22°C and morning low of 60°F15°C. Light wind from the NNE around 3 mph4 km/h. 89% chance of light rain throughout the day. Tuesday Night: Overcast, with a low around 60°F15°C. Light wind from the ESE around 5 mph8 km/h.
Rain	High 70°F21°C	Low 59°F15°C	Precip 0.61 in15.5 mm100%	Cloud 99%	Wind SSW 9 mph14 km/h	Wednesday: Overcast and warm, with a high of 70°F21°C and morning low of 63°F17°C. Breezy from the S at 8 to 11 mph13 to 18 km/h. 98% chance of rain throughout the day. Wednesday Night: Overcast, with a low around 59°F15°C. Breezy from the SSW at 9 to 13 mph15 to 21 km/h. 100% chance of rain in the evening.
Showers	High 74°F23°C	Low 59°F15°C	Precip 0.04 in0.9 mm68%	Cloud 54%	Wind W 11 mph18 km/h	Thursday: Mostly cloudy and warm, with a high of 74°F23°C and morning low of 66°F19°C. Breezy from the W at 13 to 15 mph21 to 23 km/h. Thursday Night: Partly cloudy, with a low around 59°F15°C. Breezy from the W at 9 to 12 mph15 to 19 km/h. 68% chance of showers overnight.
Clear	High 69°F21°C	Low 51°F10°C	Precip 0 in0 mm—	Cloud 11%	Wind W 7 mph11 km/h	Friday: Mostly clear and warm, with a high of 69°F21°C and morning low of 52°F11°C. Breezy from the W at 7 to 8 mph12 to 13 km/h. Dry air. Friday Night: Mostly clear, with a low around 51°F10°C. Light wind from the WSW around 6 mph10 km/h.
Clear	High 78°F26°C	Low 49°F10°C	Precip 0.01 in0.3 mm9%	Cloud 35%	Wind S 7 mph11 km/h	Saturday: Partly cloudy and warm, with a high of 78°F26°C and morning low of 53°F11°C. Breezy from the S at 6 to 7 mph9 to 11 km/h. Saturday Night: Partly cloudy, with a low around 49°F10°C. Breezy from the S at 7 to 10 mph12 to 15 km/h.
Light Rain	High 75°F24°C	Low 62°F17°C	Precip 0.32 in8.1 mm59%	Cloud 70%	Wind SW 8 mph14 km/h	Sunday: Mostly cloudy and warm, with a high of 75°F24°C and morning low of 68°F20°C. Breezy from the WSW at 9 mph14 km/h. 59% chance of light rain throughout the day. Sunday Night: Mostly cloudy, with a low around 62°F17°C. Breezy from the SW at 8 to 10 mph13 to 16 km/h. 40% chance of showers throughout the night.
Drizzle	High 68°F20°C	Low 54°F12°C	Precip 0.03 in0.8 mm13%	Cloud 44%	Wind WNW 6 mph10 km/h	Monday: Partly cloudy and mild, with a high of 68°F20°C and morning low of 56°F13°C. Breezy from the NW at 7 mph11 km/h. Dry air. Monday Night: Partly cloudy, with a low around 54°F12°C. Light wind from the WNW around 6 mph9 km/h. 13% chance of drizzle overnight.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	TuesdaySep 8	72°F22°C	60°F15°C	0.1 in2.5 mm· 89%	92%	Light Rain	ESE 3 mph5 km/h
DayOvercast and warm, with a high of 72°F22°C and morning low of 60°F15°C. Light wind from the NNE around 3 mph4 km/h. 89% chance of light rain throughout the day. NightOvercast, with a low around 60°F15°C. Light wind from the ESE around 5 mph8 km/h.
	WednesdaySep 9	70°F21°C	59°F15°C	0.61 in15.5 mm· 100%	99%	Rain	SSW 9 mph14 km/h
DayOvercast and warm, with a high of 70°F21°C and morning low of 63°F17°C. Breezy from the S at 8 to 11 mph13 to 18 km/h. 98% chance of rain throughout the day. NightOvercast, with a low around 59°F15°C. Breezy from the SSW at 9 to 13 mph15 to 21 km/h. 100% chance of rain in the evening.
	ThursdaySep 10	74°F23°C	59°F15°C	0.04 in0.9 mm· 68%	54%	Showers	W 11 mph18 km/h
DayMostly cloudy and warm, with a high of 74°F23°C and morning low of 66°F19°C. Breezy from the W at 13 to 15 mph21 to 23 km/h. NightPartly cloudy, with a low around 59°F15°C. Breezy from the W at 9 to 12 mph15 to 19 km/h. 68% chance of showers overnight.
	FridaySep 11	69°F21°C	51°F10°C	0 in0 mm· —	11%	Clear	W 7 mph11 km/h
DayMostly clear and warm, with a high of 69°F21°C and morning low of 52°F11°C. Breezy from the W at 7 to 8 mph12 to 13 km/h. Dry air. NightMostly clear, with a low around 51°F10°C. Light wind from the WSW around 6 mph10 km/h.
	SaturdaySep 12	78°F26°C	49°F10°C	0.01 in0.3 mm· 9%	35%	Clear	S 7 mph11 km/h
DayPartly cloudy and warm, with a high of 78°F26°C and morning low of 53°F11°C. Breezy from the S at 6 to 7 mph9 to 11 km/h. NightPartly cloudy, with a low around 49°F10°C. Breezy from the S at 7 to 10 mph12 to 15 km/h.
	SundaySep 13	75°F24°C	62°F17°C	0.32 in8.1 mm· 59%	70%	Light Rain	SW 8 mph14 km/h
DayMostly cloudy and warm, with a high of 75°F24°C and morning low of 68°F20°C. Breezy from the WSW at 9 mph14 km/h. 59% chance of light rain throughout the day. NightMostly cloudy, with a low around 62°F17°C. Breezy from the SW at 8 to 10 mph13 to 16 km/h. 40% chance of showers throughout the night.
	MondaySep 14	68°F20°C	54°F12°C	0.03 in0.8 mm· 13%	44%	Drizzle	WNW 6 mph10 km/h
DayPartly cloudy and mild, with a high of 68°F20°C and morning low of 56°F13°C. Breezy from the NW at 7 mph11 km/h. Dry air. NightPartly cloudy, with a low around 54°F12°C. Light wind from the WNW around 6 mph9 km/h. 13% chance of drizzle overnight.
	TuesdaySep 15	74°F23°C	52°F11°C	0.17 in4.4 mm· 40%	67%	Showers	S 8 mph12 km/h
DayMostly cloudy and warm, with a high of 74°F23°C and morning low of 55°F13°C. Breezy from the S at 8 to 9 mph13 to 14 km/h. 26% chance of showers throughout the day. NightMostly cloudy, with a low around 52°F11°C. Breezy from the S at 8 to 10 mph12 to 16 km/h. 40% chance of showers throughout the night.
	WednesdaySep 16	73°F23°C	62°F17°C	0.19 in4.9 mm· 47%	69%	Showers	WSW 7 mph12 km/h
DayMostly cloudy and warm, with a high of 73°F23°C and morning low of 63°F17°C. Breezy from the WSW at 7 to 8 mph12 to 12 km/h. 30% chance of showers throughout the day. NightMostly cloudy, with a low around 62°F17°C. Breezy from the SW at 7 to 9 mph12 to 15 km/h. 47% chance of showers throughout the night.
	ThursdaySep 17	72°F22°C	58°F14°C	0.16 in4.1 mm· 29%	69%	Showers	SSE 6 mph9 km/h
DayMostly cloudy and warm, with a high of 72°F22°C and morning low of 59°F15°C. Light wind from the ESE around 5 mph9 km/h. 22% chance of drizzle throughout the day. NightMostly cloudy, with a low around 58°F14°C. Breezy from the SSE at 6 to 7 mph10 to 11 km/h. 29% chance of showers throughout the night.
	FridaySep 18	71°F21°C	60°F16°C	0.26 in6.6 mm· 39%	68%	Showers	WSW 8 mph13 km/h
DayMostly cloudy and warm, with a high of 71°F21°C and morning low of 63°F17°C. Breezy from the WSW at 8 to 9 mph13 to 14 km/h. 39% chance of light rain throughout the day. NightMostly cloudy, with a low around 60°F16°C. Breezy from the SW at 8 mph13 km/h. 34% chance of showers throughout the night.
	SaturdaySep 19	64°F18°C	54°F12°C	0.2 in5 mm· 26%	63%	Showers	W 7 mph12 km/h
DayMostly cloudy and mild, with a high of 64°F18°C and morning low of 55°F13°C. Breezy from the WNW at 8 mph12 km/h. 25% chance of showers throughout the day. Dry air. NightMostly cloudy, with a low around 54°F12°C. Breezy from the W at 7 to 8 mph12 to 13 km/h. 26% chance of showers throughout the night.
	SundaySep 20	62°F17°C	51°F10°C	0.19 in4.8 mm· 28%	61%	Showers	WSW 7 mph11 km/h
DayMostly cloudy and mild, with a high of 62°F17°C and morning low of 52°F11°C. Breezy from the W at 7 to 8 mph12 to 13 km/h. 28% chance of showers throughout the day. Dry air. NightMostly cloudy, with a low around 51°F10°C. Breezy from the WSW at 7 mph11 km/h. 24% chance of showers throughout the night.
	MondaySep 21	62°F17°C	49°F9°C Feels 45°F7°C	0.15 in3.7 mm· 21%	60%	Showers	W 7 mph11 km/h
DayMostly cloudy and mild, with a high of 62°F17°C and morning low of 50°F10°C. Breezy from the W at 7 to 8 mph12 to 13 km/h. 21% chance of drizzle throughout the day. Dry air. NightMostly cloudy, with a low around 49°F9°C. Breezy from the WSW at 7 mph11 km/h. 18% chance of showers throughout the night.
	TuesdaySep 22	62°F17°C	48°F9°C Feels 44°F7°C	0.15 in3.8 mm· 23%	56%	Showers	WSW 7 mph11 km/h
DayMostly cloudy and mild, with a high of 62°F17°C and morning low of 49°F9°C. Breezy from the WSW at 6 to 7 mph10 to 11 km/h. 23% chance of showers throughout the day. Dry air. NightMostly cloudy, with a low around 48°F9°C. Breezy from the SW at 7 mph11 km/h. 21% 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