Weather and climate in Toronto, Ontario, Canada: monthly averages and best time for stargazing

Best for stargazingSep, Nov, OctMost clear, dark hours

Warmest monthJulyAverage high 25°C

Coolest monthFebruaryAverage low -5°C

Wettest monthJuly75 mm on average

What the weather is like in Toronto

The warmest month in Toronto is July, with average highs of 25°C. The coolest is February, when nights average -5°C. About 773 mm of rain and snow falls in a typical year, most in July and least in February.

Skies are clearest in September (60% average cloud cover) and cloudiest in January (81%). Combining cloud with the length of truly dark nights, September, November, October offer the most clear, dark hours for stargazing.

Clear, dark hours per night

2.1 Jan

2.2 Feb

2.3 Mar

1.8 Apr

1.3 May

1.2 Jun

1.6 Jul

2.4 Aug

3.3 Sep

2.6 Oct

2.8 Nov

2.2 Dec

Hours of full astronomical darkness in mid-month, multiplied by the average share of clear sky. A rough guide to how much good observing time a typical night offers.

Monthly averages

Month	High	Low	Precipitation	Cloud cover	Humidity	Wind	Dark hours
January	-0°C	-5°C	54 mm	81%	86%	20 km/h	11.3 h
February	-0°C	-5°C	49 mm	79%	84%	20 km/h	10.2 h
March	4°C	-2°C	53 mm	74%	81%	17 km/h	8.9 h
April	9°C	2°C	71 mm	75%	79%	14 km/h	7.0 h
May	15°C	8°C	73 mm	74%	78%	11 km/h	5.1 h
June	21°C	14°C	71 mm	68%	76%	11 km/h	3.8 h
July	25°C	18°C	75 mm	64%	72%	10 km/h	4.5 h
August	25°C	19°C	59 mm	62%	72%	11 km/h	6.4 h
September	21°C	15°C	66 mm	60%	74%	13 km/h	8.2 h
October	14°C	9°C	74 mm	74%	78%	16 km/h	9.8 h
November	8°C	3°C	66 mm	75%	81%	17 km/h	11.0 h
December	3°C	-2°C	63 mm	81%	84%	19 km/h	11.6 h

Climate averages: NASA POWER, 2001–2025, for the grid area around 43.50, -79.38 (about 50 km across). High and low temperatures are estimated from the monthly mean and the average daily range. Hills, coasts and cities can differ from the area average. Aurora outlook for Toronto · Sources and methods.