Fontana weather by month
Average highs run from 68°F in January to 94°F in July, and January nights average 45°F. It gets 12 inches of rain and melted snow a year, with almost no snow. Expect about 93 days a year at 90°F or hotter. The most comfortable months are October to May.
Best time to visit Fontana
For comfortable weather, go in October to May. In those months the average high stays between 62°F and 86°F, nights average 42°F or warmer, and rain stays under 4.5 inches for the month.
Month by month
| Month | High | Low | Precip. | Snow | Wet days | Days 90°F+ | Nights below 32°F | Feels |
|---|---|---|---|---|---|---|---|---|
| January | 68°F | 45°F | 2.6 in | 0.0 in | 3 | 0 | 1 | mild |
| February | 68°F | 46°F | 3.1 in | 0.0 in | 5 | 0 | 0 | mild |
| March | 72°F | 49°F | 1.6 in | 0.0 in | 3 | 1 | 0 | mild |
| April | 76°F | 51°F | 0.8 in | 0.0 in | 2 | 3 | 0 | mild |
| May | 80°F | 56°F | 0.3 in | 0.0 in | 1 | 5 | 0 | warm |
| June | 86°F | 60°F | 0.0 in | 0.0 in | 0 | 11 | 0 | warm |
| July | 94°F | 65°F | 0.1 in | 0.0 in | 0 | 23 | 0 | hot |
| August | 95°F | 65°F | 0.0 in | 0.0 in | 0 | 24 | 0 | hot |
| September | 91°F | 64°F | 0.1 in | 0.0 in | 0 | 18 | 0 | hot |
| October | 83°F | 57°F | 0.4 in | 0.0 in | 1 | 8 | 0 | warm |
| November | 75°F | 49°F | 0.8 in | 0.0 in | 2 | 2 | 0 | mild |
| December | 67°F | 44°F | 1.9 in | 0.0 in | 3 | 0 | 1 | mild |
| Year | 79°F avg | 54°F avg | 11.6 in | 0.0 in | 20 | 93 | 2 |
"Wet days" are days with at least 0.1 inch of precipitation. "Feels" is a plain-language label for the average high. Normals for 1991-2020 from NOAA NCEI, station Ontario Intl. Airport, CA (USW00003102), 8.7 miles from the city center; snowfall from Riverside Citrus Exp, CA. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Fontana
The shortest day is December 21, with 9h 52m of daylight; the longest is June 21, with 14h 25m. The earliest sunset comes around December 2 (4:39 pm) and the latest around June 26 (8:05 pm). The sun sets after 8 pm on 40 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 6:55 am | 5:03 pm | 10h 08m |
| February | 6:34 am | 5:33 pm | 10h 59m |
| March | 7:00 am | 6:57 pm | 11h 57m |
| April | 6:18 am | 7:21 pm | 13h 02m |
| May | 5:48 am | 7:44 pm | 13h 56m |
| June | 5:38 am | 8:02 pm | 14h 25m |
| July | 5:49 am | 8:01 pm | 14h 12m |
| August | 6:11 am | 7:36 pm | 13h 25m |
| September | 6:33 am | 6:55 pm | 12h 23m |
| October | 6:55 am | 6:15 pm | 11h 20m |
| November | 6:22 am | 4:45 pm | 10h 23m |
| December | 6:48 am | 4:41 pm | 9h 53m |
Calculated for 2026 at the center of Fontana with NOAA's solar equations, in local clock time (Pacific Time, including daylight saving time where it applies). Times shift by a minute or two from year to year.
Is Fontana getting warmer?
The last 10 years averaged 2.7°F warmer than the 20th century. See the climate stripes for Fontana.Frequently asked questions
What is the warmest month in Fontana?
August is the warmest month, with an average high of 95°F and an average low of 65°F (NOAA 1991-2020 normals).
What is the coldest month in Fontana?
December is the coldest, with average lows of 44°F and highs of 67°F.
What is the rainiest month in Fontana?
February gets the most precipitation, 3.1 inches on average. June is the driest at 0.0 inches.
Does it snow in Fontana?
Very little. The normal yearly snowfall is under one inch.
When is the best time to visit Fontana?
For comfortable weather, October to May. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Fontana?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Fontana profile.
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