Skip to main content
Every US forecast, compared
checkweather.io
CheckWeather USOntario

Ontario weather

Loading live data…

The weather map: all three models at once

NWS, American, European side by side around Ontario and nearby towns.Live rain radar →
Loading the three model maps…

Next 14 hours

consensus of the three models

14-day forecast

where the models agree, and where they split

Ontario, OR is at its warmest in Jul (average highs near 98°F) and coldest in Jan (lows around 24°F), with roughly 16 in of precipitation across the year. Below, compare what NWS, American, European forecast for Ontario right now, and see exactly where they disagree.

We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.

Ontario climate by month

average daytime high and overnight low across a typical year
Jan
38°
24°
Feb
46°
28°
Mar
51°
31°
Apr
62°
39°
May
74°
50°
Jun
84°
60°
Jul
98°
69°
Aug
92°
65°
Sep
81°
56°
Oct
66°
44°
Nov
47°
32°
Dec
39°
28°

Which forecast is most accurate in the US?

CheckWeather Score — graded against the weather that actually happened
ProviderCheckWeather Score🌡 Temp💨 Wind🌧 RainRun by
European logo
European ★ Best
89
/100rank #1
87±1.3°F96±1.2 mph8592% hitECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American logo
American
73
/100rank #2
81±1.9°F93±2.2 mph4972% hitNOAA / NCEP (United States)College Park, Maryland, USA

The CheckWeather Score blends temperature, wind and rain accuracy — each measured against ERA5 (the recorded weather) over the last 30 days across 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.

Common questions

What's the weather in Ontario today?
On this page we show what NWS, American, European each forecast for Ontario today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in Ontario today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Ontario and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for Ontario?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Ontario forecast is reliable, and when they split you should expect surprises. See our tested US accuracy scoreboard for how the models compare.
What is the warmest month in Ontario?
July is typically the warmest month in Ontario, with average highs around 98°F.
How cold does Ontario get?
The coldest month in Ontario is January, when overnight lows average about 24°F.
How much rain does Ontario get?
Ontario sees roughly 16 in of precipitation a year, with March usually the wettest month.

Nearby

More US weather