Ontario Climate and Average Weather
Climate of Ontario: average temperatures, rainfall and seasons month by month.
Climate in Ontario month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 9° | -7° | 1,0 in | ★★☆☆☆ |
| February | 17° | -3° | 1,5 in | ★★☆☆☆ |
| March | 24° | 1° | 1,6 in | ★★☆☆☆ |
| April | 41° | 20° | 2,3 in | ★★☆☆☆ |
| May | 58° | 37° | 2,0 in | ★★★★☆ |
| June | 72° | 50° | 2,8 in | ★★★★☆ |
| July | 77° | 57° | 3,2 in | ★★★★☆ |
| August | 73° | 54° | 2,5 in | ★★★★☆ |
| September | 68° | 49° | 2,7 in | ★★★★☆ |
| October | 51° | 37° | 2,7 in | ★★★☆☆ |
| November | 32° | 22° | 2,0 in | ★★☆☆☆ |
| December | 19° | 4° | 2,0 in | ★★☆☆☆ |
Climate type: Subarctic. Source: Open-Meteo archive (ERA5).
Recent extremes in Ontario
Highest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Ontario compares with nearby places
Annual averages, and the difference against Ontario.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Lake Superior | 264 mi | 38°F | +34°F warmer | 31 in |
| Isle Royale National Park | 267 mi | 42°F | +38°F warmer | 30 in |
| Porcupine Mountains Wilderness State Park | 366 mi | 44°F | +41°F warmer | 35 in |
Climate by city in Ontario
3 cities mapped in this atlas
Climate by state park in Ontario
1 state and provincial parks mapped in this atlas
Best time to visit Ontario
Go in June, July, August and September. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: February, November and December - expect the least comfortable mix of heat, cold or rain.
What this means for Ontario
Today is cooler than average for August. The forecast high of 65°F is 8.5°F below the 73°F typical for this month.
A 20% chance means most of the area stays dry; a passing shower is possible but short.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 98°F.
What to pack, what to skip
- Sunglasses, a brimmed hat and SPF 30+
- Layers - the daily swing is 69°F, so mornings feel nothing like afternoons
- A packable rain shell - 2 of the next 7 days carry a real chance of rain
- If your dates are flexible, avoid February, November and December - historically the least comfortable months here.
Summary
Ontario is a province in Canada. Ontario is a Canadian province or territory. It has a population of about 15.6 million. The capital is Toronto.
Right now it is 58°F (14°C) in Ontario with mainly clear. It feels like 54°F. Today runs from 54°F to 65°F. Chance of precipitation is 20%. Sightseeing conditions score 8.9/10 - excellent - go now.
The best time to visit Ontario is June, July, August and September. The climate is subarctic. February, November and December tend to be the least comfortable months. July is the warmest month with average highs near 77°F, while January is the coldest with lows near -7°F.
The closest major airport is Toronto Pearson International Airport (YYZ), about 587 mi away. Nearby highlights include CN Tower and Algonquin Provincial Park.
In plain terms. Today is cooler than average for August. The forecast high of 65°F is 8.5°F below the 73°F typical for this month. The best window to be outside is roughly 4 PM to 7 PM, when temperature, rain chance and wind line up best. fishing is the strongest bet in Ontario today at 9.2/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about Ontario
| Type | Province |
|---|---|
| Country | Canada |
| Continent | North America |
| Coordinates | 51°15′13.7″N 85°19′23.5″W (51.2538, -85.3232) |
| Capital | Toronto |
| Population | 15.600.000 |
| Area | 415.598 sq mi |
| Time zone | America/Toronto |
| Local time | 9:10 PM (UTC-04:00) |
| Best months | June, July, August and September |
| Climate | Subarctic |
Weather map for Ontario
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Explore Ontario
Every topic we hold for this place, and the same topic for the places around it.
Climate for related places
Frequently asked questions
Where is Ontario?
Ontario is a province in Canada. Its coordinates are 51.2538, -85.3232. It lies in North America.
What is the weather like in Ontario right now?
It is currently 58°F (14°C) with mainly clear. Humidity is 67% and wind is 8 mph.
When is the best time to visit Ontario?
June, July, August and September offer the most comfortable conditions in Ontario, which has a subarctic climate. February, November and December are usually the hardest months for outdoor plans.
What time zone is Ontario in?
Ontario observes America/Toronto (UTC-04:00). The local time is 9:10 PM.
How many people live in Ontario?
Ontario has a population of approximately 15.6 million.
What is the nearest airport to Ontario?
The closest airports are Toronto Pearson International Airport (YYZ), 587 mi away.
What are the top things to do in Ontario?
Popular options include CN Tower and Algonquin Provincial Park.
What places are in Ontario?
Ontario covers 4 places in this atlas, including Ottawa, Toronto, Algonquin Provincial Park and Niagara Falls, Ontario.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (ca-provinces) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 22, 2026 at 9:10 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
