Ontario Weather Forecast
Ontario weather: 47°F, overcast. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Will it rain in Ontario?
No - rain is unlikely in Ontario today.
A 16% chance means most of the area stays dry; a passing shower is possible but short.
Over the next 7 days, about 0,1 in of precipitation is forecast, with the wettest days falling on Sat.
The next 7 days look unusually dry - roughly 15% of a normal September week (0,1 in against 0,6 in).
16-day forecast for Ontario
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Thu, Sep 17 | 🌦️ Light drizzle | 56° / 43° | 16% · 0,0 in | 14 mph | 4 |
| Fri, Sep 18 | ⛅ Partly cloudy | 59° / 32° | 0% | 9 mph | 5 |
| Sat, Sep 19 | 🌦️ Drizzle | 51° / 39° | 41% · 0,1 in | 10 mph | 1 |
| Sun, Sep 20 | ☁️ Overcast | 52° / 39° | 14% | 10 mph | 4 |
| Mon, Sep 21 | ☁️ Overcast | 59° / 36° | 0% | 6 mph | 4 |
| Tue, Sep 22 | ☀️ Clear sky | 65° / 39° | 0% | 8 mph | 4 |
| Wed, Sep 23 | ☁️ Overcast | 63° / 40° | 8% | 8 mph | 3 |
| Thu, Sep 24 | 🌦️ Drizzle | 57° / 43° | 9% · 0,2 in | 17 mph | 1 |
| Fri, Sep 25 | ☁️ Overcast | 56° / 39° | 11% | 17 mph | 4 |
| Sat, Sep 26 | ☁️ Overcast | 62° / 34° | 15% | 7 mph | 4 |
| Sun, Sep 27 | 🌦️ Light drizzle | 72° / 48° | 15% · 0,0 in | 11 mph | 4 |
| Mon, Sep 28 | 🌦️ Light drizzle | 58° / 40° | 19% · 0,0 in | 10 mph | 0 |
| Tue, Sep 29 | 🌦️ Light drizzle | 47° / 35° | 29% · 0,0 in | 9 mph | 3 |
| Wed, Sep 30 | 🌦️ Light drizzle | 41° / 39° | 26% · 0,0 in | 7 mph | 1 |
| Thu, Oct 1 | 🌦️ Drizzle | 39° / 37° | 24% · 0,3 in | 8 mph | 0 |
| Fri, Oct 2 | ☀️ Clear sky | -- / -- | 18% | -- | — |
What this means for Ontario
Today is cooler than average for September. The forecast high of 56°F is 11.3°F below the 68°F typical for this month.
A 16% 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
- A warm mid-layer and gloves for early mornings and evenings
- 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 47°F (8°C) with overcast. Humidity is 76% 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 12:11 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.
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| 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 September 17, 2026 at 12:11 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
