National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Fontana-Arrow Highway (CQ057)

Lat: 34.10056°NLon: 117.49222°WElev: 1191.0ft.

NA

64°F

18°C

Humidity 63%
Wind Speed SSW 2 MPH
Barometer NA
Dewpoint 51°F (11°C)
Visibility NA
Last update 20 Apr 10:00 AM PDT
Extended Forecast for

4 Miles SSW Rialto CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 81. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 51. West wind 10 to 15 mph becoming light after midnight. Winds could gust as high as 25 mph.

    Low: 51 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Patchy fog before 11am. Otherwise, increasing clouds, with a high near 75. Light southwest wind increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 75 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 51. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 51 °F

    Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 81. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Tonight
Partly cloudy, with a low around 51. West wind 10 to 15 mph becoming light after midnight. Winds could gust as high as 25 mph.
Tuesday
Patchy fog before 11am. Otherwise, increasing clouds, with a high near 75. Light southwest wind increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Tuesday Night
A chance of showers before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 51. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Mostly sunny, with a high near 73. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 49.
Thursday
Sunny, with a high near 78.
Thursday Night
Partly cloudy, with a low around 52.
Friday
Mostly sunny, with a high near 77.
Friday Night
Partly cloudy, with a low around 53.
Saturday
A slight chance of showers. Partly sunny, with a high near 69.
Saturday Night
Mostly cloudy, with a low around 52.
Sunday
Partly sunny, with a high near 70.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Rialto CA
 34.06°N 117.39°W (Elev. 1056 ft)
Last Update:
11:30 am PDT Apr 20, 2026
Forecast Valid:
12pm PDT Apr 20, 2026-6pm PDT Apr 26, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation