Ontario Weather Forecast
Ontario weather: 57°F, overcast. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Ontario weather in October
Weather map for Ontario
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Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
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).
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 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.
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 |
See the Ontario forecast by time range
Ontario weather - more answers
Explore Ontario
Every topic we hold for this place, and the same topic for the places around it.
Weather 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 57°F (14°C) with overcast. Humidity is 70% and wind is 7 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 5:19 AM.
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 23, 2026 at 5:19 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
