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

Ontario International Airport (KONT)

Lat: 34.05316°NLon: 117.57685°WElev: 906.0ft.

Clear

55°F

13°C

Humidity 82%
Wind Speed WSW 3 MPH
Barometer 29.97 in (1014.9 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 25 May 04:30 AM PDT
Extended Forecast for

Rancho Cucamonga CA

  • Memorial Day

    Memorial Day: Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 77. Light west wind becoming southwest 10 to 15 mph in the morning. Winds could gust as high as 25 mph.

    High: 77 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 54. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A slight chance of rain before 11am. Cloudy, then gradually becoming mostly sunny, with a high near 71. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 71 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of rain after 11pm. Increasing clouds, with a low around 53. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 53 °F

    Slight Chance
    Rain

  • Wednesday

    Wednesday: A chance of rain before 11am. Cloudy, then gradually becoming mostly sunny, with a high near 68. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 68 °F

    Chance Rain
    then Partly
    Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain after 11pm. Increasing clouds, with a low around 53. Chance of precipitation is 20%.

    Low: 53 °F

    Slight Chance
    Rain

  • Thursday

    Thursday: A slight chance of rain before 11am. Mostly cloudy, then gradually becoming sunny, with a high near 70. Chance of precipitation is 20%.

    High: 70 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

Detailed Forecast

Memorial Day
Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 77. Light west wind becoming southwest 10 to 15 mph in the morning. Winds could gust as high as 25 mph.
Tonight
Increasing clouds, with a low around 54. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday
A slight chance of rain before 11am. Cloudy, then gradually becoming mostly sunny, with a high near 71. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tuesday Night
A slight chance of rain after 11pm. Increasing clouds, with a low around 53. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Wednesday
A chance of rain before 11am. Cloudy, then gradually becoming mostly sunny, with a high near 68. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Wednesday Night
A slight chance of rain after 11pm. Increasing clouds, with a low around 53. Chance of precipitation is 20%.
Thursday
A slight chance of rain before 11am. Mostly cloudy, then gradually becoming sunny, with a high near 70. Chance of precipitation is 20%.
Thursday Night
Mostly clear, with a low around 52.
Friday
Sunny, with a high near 74.
Friday Night
Clear, with a low around 55.
Saturday
Sunny, with a high near 80.
Saturday Night
Clear, with a low around 58.
Sunday
Sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Rancho Cucamonga CA
 34.1°N 117.57°W (Elev. 1198 ft)
Last Update:
12:37 am PDT May 25, 2026
Forecast Valid:
4am PDT May 25, 2026-6pm PDT May 31, 2026
 
Forecast Discussion
 
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