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

86°F

30°C

Humidity 20%
Wind Speed W 5 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Heat Index83°F (28°C)
Last update 11 Nov 03:00 PM PST
Extended Forecast for

4 Miles E Ontario International Arpt CA

  • Tonight

    Tonight: Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 60. Calm wind.

    Low: 60 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 78. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 78 °F

    Patchy Fog
    then Partly
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55. Calm wind becoming southwest around 5 mph.

    Low: 55 °F

    Partly Cloudy

  • Thursday

    Thursday: Showers likely, mainly after 4pm. Partly sunny, with a high near 72. Light south wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 72 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 56. Southwest wind 5 to 10 mph becoming light and variable. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 56 °F

    Heavy Rain

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms after 10am. Mostly cloudy, with a high near 62. Chance of precipitation is 70%.

    High: 62 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 50. Chance of precipitation is 50%.

    Low: 50 °F

    Chance
    Showers

  • Saturday

    Saturday: A chance of showers. Partly sunny, with a high near 61.

    High: 61 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Chance
    Showers

Detailed Forecast

Tonight
Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 60. Calm wind.
Wednesday
Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 78. Calm wind becoming southwest around 5 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 55. Calm wind becoming southwest around 5 mph.
Thursday
Showers likely, mainly after 4pm. Partly sunny, with a high near 72. Light south wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 56. Southwest wind 5 to 10 mph becoming light and variable. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Friday
Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms after 10am. Mostly cloudy, with a high near 62. Chance of precipitation is 70%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 50. Chance of precipitation is 50%.
Saturday
A chance of showers. Partly sunny, with a high near 61.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 49.
Sunday
A slight chance of showers. Mostly sunny, with a high near 62.
Sunday Night
A chance of showers. Partly cloudy, with a low around 49.
Monday
A chance of showers. Mostly sunny, with a high near 64.
Monday Night
A chance of showers. Mostly cloudy, with a low around 48.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 65.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Ontario International Arpt CA
 34.06°N 117.53°W (Elev. 981 ft)
Last Update:
12:58 pm PST Nov 11, 2025
Forecast Valid:
4pm PST Nov 11, 2025-6pm PST Nov 18, 2025
 
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