NWS, American, European side by side around Ontario and nearby towns.Live rain radar →
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Next 14 hours
consensus of the three models
7-day forecast
where the models agree, and where they split
Ontario, CA is at its warmest in Jul (average highs near 94°F) and coldest in Feb (lows around 43°F), with roughly 32 in of precipitation across the year. Below, compare what NWS, American, European forecast for Ontario right now, and see exactly where they disagree.
Ontario climate by month
average daytime high and overnight low across a typical year
Jan
60°
44°
Feb
60°
43°
Mar
61°
46°
Apr
71°
49°
May
75°
53°
Jun
82°
57°
Jul
94°
65°
Aug
93°
66°
Sep
87°
63°
Oct
84°
60°
Nov
72°
49°
Dec
68°
48°
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?
Jul is typically the warmest month in Ontario, with average highs around 94°F.
How cold does Ontario get?
The coldest month in Ontario is Feb, when overnight lows average about 43°F.
How much rain does Ontario get?
Ontario sees roughly 32 in of precipitation a year, with Feb usually the wettest month.
The forecasts Americans check
The two biggest apps keep their model a secret, so we can't show their numbers, only link you to them. The National Weather Service is public, so its data sits right in the comparison above.