Current Conditions

Ancaster, Ontario

53°F11°C

Partly Cloudy

Wind

ENE 11 mph17 km/h

Humidity

72%

Cloud Cover

74%

As of Monday, September 21, 2026 at 11:46 PM EDT

Today's Outlook

Night

Partly cloudy, with a low around 49°F9°C. Breezy from the ENE at 10 to 11 mph16 to 17 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Partly Cloudy	High 60°F16°C	Low 49°F9°CFeels 44°F7°C	Precip 0 in0 mm—	Cloud 55%	Wind ENE 12 mph19 km/h	Tuesday: Mostly cloudy and mild, with a high of 60°F16°C and morning low of 49°F10°C. Breezy from the ENE at 13 to 14 mph21 to 23 km/h. Dry air. Tuesday Night: Partly cloudy, with a low around 49°F9°C. Breezy from the ENE at 10 to 11 mph16 to 17 km/h.
Clear	High 64°F18°C	Low 50°F10°C	Precip 0 in0 mm—	Cloud 31%	Wind ENE 11 mph18 km/h	Wednesday: Partly cloudy and mild, with a high of 64°F18°C and morning low of 51°F11°C. Breezy from the ENE at 13 to 14 mph20 to 23 km/h. Dry air. Wednesday Night: Partly cloudy, with a low around 50°F10°C. Breezy from the ENE at 10 to 11 mph16 to 18 km/h.
Clear	High 66°F19°C	Low 48°F9°CFeels 45°F7°C	Precip 0 in0 mm—	Cloud 12%	Wind ENE 7 mph12 km/h	Thursday: Mostly clear and mild, with a high of 66°F19°C and morning low of 49°F9°C. Breezy from the ENE at 8 to 10 mph14 to 16 km/h. Dry air. Thursday Night: Mostly clear, with a low around 48°F9°C. Breezy from the ENE at 6 to 8 mph10 to 12 km/h.
Clear	High 69°F20°C	Low 42°F6°CFeels 39°F4°C	Precip 0 in0 mm—	Cloud 37%	Wind NNE 6 mph9 km/h	Friday: Partly cloudy and warm, with a high of 69°F20°C and morning low of 44°F7°C. Breezy from the NNE at 7 mph11 km/h. Dry air. Friday Night: Partly cloudy, with a low around 42°F6°C. Breezy from the NNE at 5 to 7 mph8 to 11 km/h.
Clear	High 72°F22°C	Low 48°F9°CFeels 45°F7°C	Precip 0 in0 mm—	Cloud 38%	Wind NNE 7 mph11 km/h	Saturday: Partly cloudy and warm, with a high of 72°F22°C and morning low of 48°F9°C. Breezy from the NNE at 7 to 8 mph12 to 13 km/h. Dry air. Saturday Night: Partly cloudy, with a low around 48°F9°C. Breezy from the N at 7 mph11 km/h.
Partly Cloudy	High 70°F21°C	Low 51°F10°C	Precip 0.01 in0.2 mm5%	Cloud 52%	Wind N 7 mph11 km/h	Sunday: Mostly cloudy and warm, with a high of 70°F21°C and morning low of 51°F10°C. Breezy from the NNE at 7 to 8 mph12 to 13 km/h. Dry air. Sunday Night: Mostly cloudy, with a low around 51°F10°C. Breezy from the N at 6 to 7 mph10 to 11 km/h.
Clear	High 71°F22°C	Low 51°F11°C	Precip 0.01 in0.3 mm7%	Cloud 39%	Wind NNW 5 mph9 km/h	Monday: Partly cloudy and warm, with a high of 71°F22°C and morning low of 51°F11°C. Light wind from the N around 6 mph9 km/h. Dry air. Monday Night: Partly cloudy, with a low around 51°F11°C. Light wind from the NNW around 5 mph8 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	TuesdaySep 22	60°F16°C	49°F9°C Feels 44°F7°C	0 in0 mm· —	55%	Partly Cloudy	ENE 12 mph19 km/h
DayMostly cloudy and mild, with a high of 60°F16°C and morning low of 49°F10°C. Breezy from the ENE at 13 to 14 mph21 to 23 km/h. Dry air. NightPartly cloudy, with a low around 49°F9°C. Breezy from the ENE at 10 to 11 mph16 to 17 km/h.
	WednesdaySep 23	64°F18°C	50°F10°C	0 in0 mm· —	31%	Clear	ENE 11 mph18 km/h
DayPartly cloudy and mild, with a high of 64°F18°C and morning low of 51°F11°C. Breezy from the ENE at 13 to 14 mph20 to 23 km/h. Dry air. NightPartly cloudy, with a low around 50°F10°C. Breezy from the ENE at 10 to 11 mph16 to 18 km/h.
	ThursdaySep 24	66°F19°C	48°F9°C Feels 45°F7°C	0 in0 mm· —	12%	Clear	ENE 7 mph12 km/h
DayMostly clear and mild, with a high of 66°F19°C and morning low of 49°F9°C. Breezy from the ENE at 8 to 10 mph14 to 16 km/h. Dry air. NightMostly clear, with a low around 48°F9°C. Breezy from the ENE at 6 to 8 mph10 to 12 km/h.
	FridaySep 25	69°F20°C	42°F6°C Feels 39°F4°C	0 in0 mm· —	37%	Clear	NNE 6 mph9 km/h
DayPartly cloudy and warm, with a high of 69°F20°C and morning low of 44°F7°C. Breezy from the NNE at 7 mph11 km/h. Dry air. NightPartly cloudy, with a low around 42°F6°C. Breezy from the NNE at 5 to 7 mph8 to 11 km/h.
	SaturdaySep 26	72°F22°C	48°F9°C Feels 45°F7°C	0 in0 mm· —	38%	Clear	NNE 7 mph11 km/h
DayPartly cloudy and warm, with a high of 72°F22°C and morning low of 48°F9°C. Breezy from the NNE at 7 to 8 mph12 to 13 km/h. Dry air. NightPartly cloudy, with a low around 48°F9°C. Breezy from the N at 7 mph11 km/h.
	SundaySep 27	70°F21°C	51°F10°C	0.01 in0.2 mm· 5%	52%	Partly Cloudy	N 7 mph11 km/h
DayMostly cloudy and warm, with a high of 70°F21°C and morning low of 51°F10°C. Breezy from the NNE at 7 to 8 mph12 to 13 km/h. Dry air. NightMostly cloudy, with a low around 51°F10°C. Breezy from the N at 6 to 7 mph10 to 11 km/h.
	MondaySep 28	71°F22°C	51°F11°C	0.01 in0.3 mm· 7%	39%	Clear	NNW 5 mph9 km/h
DayPartly cloudy and warm, with a high of 71°F22°C and morning low of 51°F11°C. Light wind from the N around 6 mph9 km/h. Dry air. NightPartly cloudy, with a low around 51°F11°C. Light wind from the NNW around 5 mph8 km/h.
	TuesdaySep 29	71°F22°C	50°F10°C	0 in0.1 mm· 2%	37%	Clear	WNW 5 mph8 km/h
DayPartly cloudy and warm, with a high of 71°F22°C and morning low of 50°F10°C. Light wind from the W around 5 mph7 km/h. NightPartly cloudy, with a low around 50°F10°C. Light wind from the WNW around 5 mph8 km/h.
	WednesdaySep 30	70°F21°C	53°F12°C	0.1 in2.6 mm· 20%	63%	Drizzle	SSW 6 mph10 km/h
DayMostly cloudy and warm, with a high of 70°F21°C and morning low of 54°F12°C. Breezy from the S at 7 to 8 mph11 to 12 km/h. 20% chance of drizzle throughout the day. NightMostly cloudy, with a low around 53°F12°C. Breezy from the SSW at 6 to 7 mph9 to 11 km/h. 17% chance of drizzle in the evening.
	ThursdayOct 1	69°F20°C	55°F13°C	0.08 in2 mm· 15%	60%	Drizzle	WSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 69°F20°C and morning low of 55°F13°C. Breezy from the WSW at 7 to 8 mph12 to 13 km/h. 15% chance of drizzle throughout the day. NightMostly cloudy, with a low around 55°F13°C. Breezy from the W at 7 mph11 km/h. 13% chance of drizzle throughout the night.
	FridayOct 2	67°F20°C	53°F12°C	0.08 in2.1 mm· 16%	59%	Drizzle	NW 7 mph11 km/h
DayMostly cloudy and mild, with a high of 67°F20°C and morning low of 53°F12°C. Breezy from the WNW at 8 mph12 km/h. 15% chance of drizzle throughout the day. NightMostly cloudy, with a low around 53°F12°C. Breezy from the NW at 7 mph10 km/h. 16% chance of drizzle throughout the night.
	SaturdayOct 3	66°F19°C	53°F12°C	0.08 in2.1 mm· 18%	57%	Drizzle	WSW 7 mph11 km/h
DayMostly cloudy and mild, with a high of 66°F19°C and morning low of 53°F12°C. Breezy from the SW at 8 mph12 km/h. 18% chance of drizzle throughout the day. NightMostly cloudy, with a low around 53°F12°C. Breezy from the NNW at 7 mph11 km/h. 17% chance of drizzle throughout the night.
	SundayOct 4	67°F19°C	53°F12°C	0.11 in2.9 mm· 18%	64%	Drizzle	SW 7 mph11 km/h
DayMostly cloudy and mild, with a high of 67°F19°C and morning low of 53°F12°C. Breezy from the SSW at 7 to 8 mph12 to 13 km/h. 18% chance of drizzle throughout the day. NightMostly cloudy, with a low around 53°F12°C. Breezy from the SW at 7 mph11 km/h. 15% chance of drizzle throughout the night.
	MondayOct 5	66°F19°C	54°F12°C	0.15 in3.9 mm· 25%	65%	Showers	WSW 7 mph12 km/h
DayMostly cloudy and mild, with a high of 66°F19°C and morning low of 54°F12°C. Breezy from the WSW at 8 mph13 km/h. 25% chance of showers throughout the day. NightMostly cloudy, with a low around 54°F12°C. Breezy from the WSW at 7 mph11 km/h. 23% chance of showers throughout the night.
	TuesdayOct 6	65°F18°C	53°F12°C	0.1 in2.6 mm· 25%	65%	Drizzle	W 7 mph12 km/h
DayMostly cloudy and mild, with a high of 65°F18°C and morning low of 53°F12°C. Breezy from the W at 8 mph12 km/h. 25% chance of drizzle throughout the day. NightMostly cloudy, with a low around 53°F12°C. Breezy from the W at 7 mph11 km/h. 18% chance of drizzle throughout the night.

Nearby Cities

Hamilton7 mi12 km Waterdown10 mi15 km Stoney Creek11 mi18 km Burlington14 mi22 km Brantford15 mi25 km Christopher-Champlain18 mi29 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: 43.2181°N, 79.9872°W·Elevation: 253m·Timezone: America/Toronto·Population: 40,557