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.

Overcast

68°F

20°C

Humidity 56%
Wind Speed WSW 4 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 25 May 12:05 PM PDT
Extended Forecast for

Rancho Cucamonga CA

  • Memorial Day

    Memorial Day: Sunny, with a high near 76. West wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 76 °F

    Sunny

  • Tonight

    Tonight: Patchy drizzle after 2am. Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 54. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Patchy Fog
    then Patchy
    Drizzle and
    Patchy Fog

  • Tuesday

    Tuesday: Patchy drizzle and fog before 11am. Cloudy through mid morning, then gradual clearing, with a high near 69. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 20 mph.

    High: 69 °F

    Patchy
    Drizzle and
    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy drizzle after 2am. Mostly cloudy, with a low around 52. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 52 °F

    Partly Cloudy
    then Patchy
    Drizzle

  • Wednesday

    Wednesday: Patchy drizzle before 11am. Partly sunny, with a high near 67. South wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 67 °F

    Patchy
    Drizzle then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 67.

    High: 67 °F

    Decreasing
    Clouds

  • Thursday Night

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

    Low: 52 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

Detailed Forecast

Memorial Day
Sunny, with a high near 76. West wind 5 to 15 mph, with gusts as high as 25 mph.
Tonight
Patchy drizzle after 2am. Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 54. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday
Patchy drizzle and fog before 11am. Cloudy through mid morning, then gradual clearing, with a high near 69. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Patchy drizzle after 2am. Mostly cloudy, with a low around 52. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Wednesday
Patchy drizzle before 11am. Partly sunny, with a high near 67. South wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly cloudy, with a low around 52.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 67.
Thursday Night
Mostly clear, with a low around 52.
Friday
Sunny, with a high near 75.
Friday Night
Mostly clear, with a low around 54.
Saturday
Sunny, with a high near 81.
Saturday Night
Clear, with a low around 58.
Sunday
Sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rancho Cucamonga CA
 34.12°N 117.6°W (Elev. 1368 ft)
Last Update:
10:54 am PDT May 25, 2026
Forecast Valid:
12pm PDT May 25, 2026-6pm PDT May 31, 2026
 
Forecast Discussion
 
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