NWS, American, European side by side around Fontana 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
Fontana, CA is at its warmest in Jul (average highs near 98°F) and coldest in Jan (lows around 42°F), with roughly 29 in of precipitation across the year. Below, compare what NWS, American, European forecast for Fontana right now, and see exactly where they disagree.
Fontana climate by month
average daytime high and overnight low across a typical year
Jan
59°
42°
Feb
59°
42°
Mar
60°
44°
Apr
72°
48°
May
76°
53°
Jun
85°
59°
Jul
98°
71°
Aug
95°
69°
Sep
88°
63°
Oct
84°
58°
Nov
71°
49°
Dec
68°
48°
Common questions
What's the weather in Fontana today?
On this page we show what NWS, American, European each forecast for Fontana 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 Fontana today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Fontana 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 Fontana?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Fontana 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 Fontana?
Jul is typically the warmest month in Fontana, with average highs around 98°F.
How cold does Fontana get?
The coldest month in Fontana is Jan, when overnight lows average about 42°F.
How much rain does Fontana get?
Fontana sees roughly 29 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.