Hyperlocal rainfall totals + real-time NOAA forecasts
Accurate weather without the clutter
Fontana, CA Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Fontana, CA?
Fontana, CA gets 11.6 in of precipitation a year over about 35 rainy days. August is the warmest month (average high 94°F) and December the coldest (average low 43°F).
Semi-arid climate
Fontana, CA has hot summers and mild winters. Daytime highs range from about 67°F in December to 94°F in August. February is usually the wettest month. The most comfortable time to visit is typically January, March to May, and November to December, when daytime highs sit near 72°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 44° | 67° |
| Spring | Mar–May | 52° | 75° |
| Summer | Jun–Aug | 63° | 91° |
| Autumn | Sep–Nov | 56° | 82° |
How much rain does Fontana get?
Fontana gets 11.6 in of precipitation in an average year, spread over about 35 days with measurable rain. That is fewer rainy days than 90% of the US.
February is the wettest month, with 3.1 in. June is the driest, with 0.0 in. February has the most rainy days, about 6.
The longest dry spell in the last five years lasted 175 days, to October 27, 2024.
From September 2025 to August 2026 Fontana got 12.8 in of rain, against a normal of 11.6 in for those months. November 2025 had the most, with 4.0 in.
See where Fontana ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in California.
Fontana weather by month
Fontana weather in January
In January, Fontana averages a high of 68°F and a low of 44°F. It gets 2.6 in of precipitation over about 5 rainy days. Estimated sunshine is 53% of daylight hours, derived from ERA5 cloud cover. The January record high is 90°F (2003) and the record low is 25°F (2007). January is one of the most comfortable months to visit.
Fontana weather in February
In February, Fontana averages a high of 67°F and a low of 45°F. It gets 3.1 in of precipitation over about 6 rainy days. Estimated sunshine is 60% of daylight hours, derived from ERA5 cloud cover. The February record high is 91°F (2026) and the record low is 29°F (2018).
Fontana weather in March
In March, Fontana averages a high of 71°F and a low of 48°F. It gets 1.6 in of precipitation over about 5 rainy days. Estimated sunshine is 46% of daylight hours, derived from ERA5 cloud cover. The March record high is 100°F (2026) and the record low is 33°F (2023). March is one of the most comfortable months to visit.
Fontana weather in April
In April, Fontana averages a high of 75°F and a low of 51°F. It gets 0.8 in of precipitation over about 4 rainy days. Estimated sunshine is 58% of daylight hours, derived from ERA5 cloud cover. The April record high is 101°F (2004) and the record low is 33°F (1999). April is one of the most comfortable months to visit.
Fontana weather in May
In May, Fontana averages a high of 79°F and a low of 56°F. It gets 0.3 in of precipitation over about 2 rainy days. Estimated sunshine is 63% of daylight hours, derived from ERA5 cloud cover. The May record high is 103°F (2004) and the record low is 42°F (1999). May is one of the most comfortable months to visit.
Fontana weather in June
In June, Fontana averages a high of 86°F and a low of 60°F. It gets 0.0 in of precipitation over about 0 rainy days. Estimated sunshine is 73% of daylight hours, derived from ERA5 cloud cover. The June record high is 112°F (2016) and the record low is 46°F (1999).
Fontana weather in July
In July, Fontana averages a high of 93°F and a low of 65°F. It gets 0.1 in of precipitation over about 1 rainy days. Estimated sunshine is 85% of daylight hours, derived from ERA5 cloud cover. The July record high is 117°F (2018) and the record low is 56°F (2004).
Fontana weather in August
In August, Fontana averages a high of 94°F and a low of 65°F. It gets 0.0 in of precipitation over about 0 rainy days. Estimated sunshine is 83% of daylight hours, derived from ERA5 cloud cover. The August record high is 112°F (2017) and the record low is 56°F (1999).
Fontana weather in September
In September, Fontana averages a high of 91°F and a low of 63°F. It gets 0.1 in of precipitation over about 1 rainy days. Estimated sunshine is 78% of daylight hours, derived from ERA5 cloud cover. The September record high is 118°F (2020) and the record low is 51°F (2013).
Fontana weather in October
In October, Fontana averages a high of 82°F and a low of 57°F. It gets 0.4 in of precipitation over about 2 rainy days. Estimated sunshine is 74% of daylight hours, derived from ERA5 cloud cover. The October record high is 107°F (2012) and the record low is 41°F (2019).
Fontana weather in November
In November, Fontana averages a high of 74°F and a low of 49°F. It gets 0.8 in of precipitation over about 4 rainy days. Estimated sunshine is 68% of daylight hours, derived from ERA5 cloud cover. The November record high is 98°F (2010) and the record low is 32°F (2015). November is one of the most comfortable months to visit.
Fontana weather in December
In December, Fontana averages a high of 67°F and a low of 43°F. It gets 1.9 in of precipitation over about 6 rainy days. Estimated sunshine is 51% of daylight hours, derived from ERA5 cloud cover. The December record high is 87°F (2021) and the record low is 28°F (1998). December is one of the most comfortable months to visit.
Sunshine, humidity and wind in Fontana
July is the sunniest month in Fontana, with estimated sunshine of 85% of daylight hours from ERA5 cloud cover. March is the cloudiest, at 46%. The annual cloud-cover estimate is 66% of daylight hours; it is not a measurement of sunshine duration. Fontana is sunnier than 93% of the US.
Humidity peaks in March at 58% and is lowest in November at 37%.
Wind averages 6 mph over the year, and May is the windiest month at 7 mph.
Fontana has about 92 days a year above 90°F. Fontana is hotter than 90% of the US.
Thunderstorms occur on about 6 days a year.
See where Fontana ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
Fontana weather records
These records cover ONTARIO INTL AP during 1998–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Fontana station is 118°F, on September 5, 2020. The coldest is 25°F, on January 14, 2007.
The wettest day in the available station history brought 3.6 in of precipitation, on February 5, 2024.
The best time to visit Fontana
The most comfortable time to visit is typically January, March to May, and November to December, when daytime highs sit near 72°F.
Winter (December–February) is mild, with average highs around 67°F and lows near 44°F.
Spring (March–May) is warm, with average highs around 75°F and lows near 52°F.
Summer (June–August) is hot, with average highs around 91°F and lows near 63°F.
Autumn (September–November) is hot, with average highs around 82°F and lows near 56°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Wind | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|---|
| January | 44° | 68° | 2.6 in | 5 | 5 mph | 52% | 53% | 90° | 25° |
| February | 45° | 67° | 3.1 in | 6 | 5 mph | 44% | 60% | 91° | 29° |
| March | 48° | 71° | 1.6 in | 5 | 6 mph | 58% | 46% | 100° | 33° |
| April | 51° | 75° | 0.76 in | 4 | 7 mph | 56% | 58% | 101° | 33° |
| May | 56° | 79° | 0.30 in | 2 | 7 mph | 58% | 63% | 103° | 42° |
| June | 60° | 86° | 0.02 in | 0 | 7 mph | 51% | 73% | 112° | 46° |
| July | 65° | 93° | 0.05 in | 1 | 7 mph | 45% | 85% | 117° | 56° |
| August | 65° | 94° | 0.03 in | 0 | 6 mph | 45% | 83% | 112° | 56° |
| September | 63° | 91° | 0.10 in | 1 | 6 mph | 46% | 78% | 118° | 51° |
| October | 57° | 82° | 0.41 in | 2 | 5 mph | 41% | 74% | 107° | 41° |
| November | 49° | 74° | 0.80 in | 4 | 5 mph | 37% | 68% | 98° | 32° |
| December | 43° | 67° | 1.9 in | 6 | 5 mph | 47% | 51% | 87° | 28° |
Station: ONTARIO INTL AP, 14 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1998–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Fontana climate questions
How much rain does Fontana get?
Fontana gets 11.6 in of precipitation in an average year, over about 35 rainy days.
What is the wettest month in Fontana?
February is the wettest month in Fontana, with 3.1 in. June is the driest, with 0.0 in.
How many rainy days does Fontana have a year?
Fontana has about 35 days with measurable rain in an average year. February has the most, about 6.
What is the hottest month in Fontana?
August is the warmest month in Fontana, with an average high of 94°F.
What is the coldest month in Fontana?
December is the coldest month in Fontana, with an average low of 43°F.
What is the record high temperature in Fontana?
Within the available 1998–2026 station history, the record high at the Fontana station is 118°F, set on September 5, 2020. The record low is 25°F, on January 14, 2007.
What is the sunniest month in Fontana?
July is the sunniest month in Fontana, with estimated sunshine of 85% of daylight hours from ERA5 cloud cover. March is the cloudiest.
What is the best time to visit Fontana?
The most comfortable time to visit is typically January, March to May, and November to December, when daytime highs sit near 72°F.