South Fontana, California Weather
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Weather Forecast for South Fontana, California : San Bernardino County
Issued: 4:57 am PDT May 4, 2025 Latitude: 34.0627896 Longitude: -117.4889386 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Monday Tuesday Wednesday Thursday Friday Saturday
40% chance of rain on Today 30% chance of rain on Tonight 20% chance of on Monday Partly Sunny on Tuesday Sunny on Wednesday Sunny on Thursday Mostly Sunny on Friday Sunny on Saturday
High: 64°F Low: 55°F High: 67°F High: 73°F High: 79°F High: 86°F High: 88°F High: 89°F
Low: 53°F Low: 55°F Low: 58°F Low: 62°F Low: 63°F  
Rain Rain Partly Sunny Partly Sunny Sunny Sunny Mostly Sunny Sunny
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Current Conditions at
ONTARIO - (KONT)
55°
Cloudy
as of 9:33 AM PDST
Rel. Humidity: 87%
Dew Point: 52°F
Visibility: 7 Miles
Pressure: 29.78 in.
Flight Rule: VFR
Wind Data
9 MPH
270° West
Cloud Level(s): Few at 1400ft, Scattered at 1900ft, Solid Overcast at 3300ft
Current Conditions at
RIVERSIDE - (KRAL)
54°
Cloudy
Light Rain Mist
as of 9:28 AM PDST
Rel. Humidity: 93%
Dew Point: 52°F
Visibility: 3 Miles
Pressure: 29.79 in.
Flight Rule: IFR
Wind Data
3 MPH
300° Northwest
Cloud Level(s): Broken at 600ft, Broken at 1100ft, Solid Overcast at 1900ft
Current Conditions at
MARCH AFB - (KRIV)
54°
Cloudy
as of 9:25 AM PDST
Rel. Humidity: 81%
Dew Point: 48°F
Visibility: 10 Miles
Pressure: 29.78 in.
Flight Rule: MVFR
Wind Data
13 MPH
170° South
Cloud Level(s): Scattered at 1300ft, Solid Overcast at 1600ft
40% chance of rain Today Today... A chance of showers, mainly after 11am. Mostly cloudy, with a high near 64. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
30% chance of rain Tonight Tonight... A chance of showers, mainly before 8pm. Mostly cloudy, with a low around 55. Southwest wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
20% chance of Monday Monday... A slight chance of showers before 11am. Partly sunny, with a high near 67. Light south wind becoming southwest 5 to 10 mph in the afternoon. Chance of precipitation is 20%.
Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 53. West wind 5 to 10 mph.
Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 73. Light south wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 55.
Sunny on Wednesday Wednesday... Sunny, with a high near 79.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 58.
Sunny on Thursday Thursday... Sunny, with a high near 86.
Mostly Clear on Thursday Night Thursday Night... Mostly clear, with a low around 62.
Mostly Sunny on Friday Friday... Mostly sunny, with a high near 88.
Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around 63.
Sunny on Saturday Saturday... Sunny, with a high near 89.
Current Radar Image


Sun Almanac for South Fontana, California
Sunrise: 05:57 AM
Sunset: 7:36 PM
Civil Sunrise:05:30 AM
Civil Sunset: 8:03 PM
Nautical Sunrise: 04:58 AM
Nautical Sunset: 8:36 PM
Astro Sunrise: 04:23 AM
Astro Sunset: 9:10 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.