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

Hazardous Weather Conditions

Current conditions at

Fontana-Arrow Highway (CQ057)

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

NA

81°F

27°C

Humidity 25%
Wind Speed WSW 5 MPH
Barometer NA
Dewpoint 42°F (6°C)
Visibility NA
Heat Index79°F (26°C)
Last update 21 May 12:00 PM PDT
Extended Forecast for

Rancho Cucamonga CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 88. West wind around 15 mph, with gusts as high as 30 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 59. Southwest wind 10 to 15 mph becoming light west in the evening. Winds could gust as high as 25 mph.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 83. Light and variable wind becoming southwest 10 to 15 mph in the morning. Winds could gust as high as 25 mph.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 57. Southwest wind 5 to 10 mph becoming light west in the evening. Winds could gust as high as 25 mph.

    Low: 57 °F

    Mostly Clear

  • Saturday

    Saturday: Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 82. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 82 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Sunday

    Sunday: Patchy fog before 11am. Otherwise, sunny, with a high near 81.

    High: 81 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Memorial Day

    Memorial Day: Sunny, with a high near 77.

    High: 77 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 88. West wind around 15 mph, with gusts as high as 30 mph.
Tonight
Mostly clear, with a low around 59. Southwest wind 10 to 15 mph becoming light west in the evening. Winds could gust as high as 25 mph.
Friday
Sunny, with a high near 83. Light and variable wind becoming southwest 10 to 15 mph in the morning. Winds could gust as high as 25 mph.
Friday Night
Mostly clear, with a low around 57. Southwest wind 5 to 10 mph becoming light west in the evening. Winds could gust as high as 25 mph.
Saturday
Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 82. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.
Saturday Night
Mostly clear, with a low around 56.
Sunday
Patchy fog before 11am. Otherwise, sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 55.
Memorial Day
Sunny, with a high near 77.
Monday Night
Increasing clouds, with a low around 54.
Tuesday
Mostly sunny, with a high near 73.
Tuesday Night
Mostly clear, with a low around 53.
Wednesday
Mostly sunny, with a high near 71.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rancho Cucamonga CA
 34.13°N 117.57°W (Elev. 1362 ft)
Last Update:
12:32 pm PDT May 21, 2026
Forecast Valid:
1pm PDT May 21, 2026-6pm PDT May 27, 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