Ontario Weather Forecast
Ontario weather: 57°F, overcast. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Snow forecast for Ontario
No snow is in the current forecast window for Ontario.
0 of the next 16 nights are forecast to reach freezing.
Historically, average lows drop below freezing in January, February, March, April, November and December.
16-day forecast for Ontario
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Sat, Aug 22 | ☁️ Overcast | 65° / 55° | 20% | 13 mph | 5 |
| Sun, Aug 23 | 🌦️ Light drizzle | 64° / 51° | 5% · 0,0 in | 13 mph | 6 |
| Mon, Aug 24 | ☁️ Overcast | 73° / 49° | 1% | 9 mph | 6 |
| Tue, Aug 25 | ☁️ Overcast | 79° / 50° | 1% | 6 mph | 6 |
| Wed, Aug 26 | ☁️ Overcast | 80° / 54° | 45% | 8 mph | 5 |
| Thu, Aug 27 | 🌧️ Rain | 63° / 48° | 45% · 2,0 in | 14 mph | 0 |
| Fri, Aug 28 | 🌧️ Rain | 48° / 43° | 5% · 1,2 in | 15 mph | 0 |
| Sat, Aug 29 | 🌦️ Light showers | 46° / 43° | 12% · 1,3 in | 14 mph | 0 |
| Sun, Aug 30 | ☁️ Overcast | 56° / 44° | 25% | 9 mph | 3 |
| Mon, Aug 31 | ☁️ Overcast | 61° / 47° | 29% | 5 mph | 4 |
| Tue, Sep 1 | 🌦️ Light drizzle | 52° / 48° | 18% · 0,1 in | 4 mph | 1 |
| Wed, Sep 2 | ☁️ Overcast | 56° / 44° | 23% | 5 mph | 3 |
| Thu, Sep 3 | ☁️ Overcast | 67° / 45° | 19% | 5 mph | 5 |
| Fri, Sep 4 | ☁️ Overcast | 70° / 47° | 30% | 8 mph | 5 |
| Sat, Sep 5 | 🌦️ Light drizzle | 73° / 50° | 42% · 0,0 in | 12 mph | 5 |
| Sun, Sep 6 | 🌧️ Rain | 57° / 55° | 34% · 0,8 in | 9 mph | 1 |
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).
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.
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 9:04 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 9:04 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
