National Weather Service United States Department of Commerce

We need your feedback! Take our new, shorter survey

NWS is conducting research on how to better serve your needs. Please complete our annual customer satisfaction survey. We've shortened it from previous years to make it easier for you to share your opinions with us. The survey is available via the link below and the core section should only take about 10 minutes to complete.
Read More...

Current Conditions

En Español

Share |

Rancho Cucamonga CA

7 Day Forecast

For More Weather Information:

San Diego, CA Local Forecast Office

Tonight

Mostly Clear

Mostly
Clear

Low: 74 °F

Monday

Sunny

Sunny

High: 104 °F

Monday
Night

Mostly Clear

Mostly
Clear

Low: 77 °F

Tuesday

Sunny

Sunny

High: 105 °F

Tuesday
Night

Partly Cloudy

Partly
Cloudy

Low: 76 °F

Wednesday

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

High: 98 °F

Wednesday
Night

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

Low: 71 °F

Thursday

Slight Chance Showers

Slight Chc
Showers

High: 90 °F

Thursday
Night

Partly Cloudy

Partly
Cloudy

Low: 68 °F

Detailed Forecast

  • Tonight Mostly clear, with a low around 74. West wind 5 to 10 mph becoming light and variable in the evening.
  • Monday Sunny, with a high near 104. Calm wind.
  • Monday Night Mostly clear, with a low around 77. West wind 10 to 15 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.
  • Tuesday Sunny, with a high near 105. Calm wind.
  • Tuesday Night Partly cloudy, with a low around 76. West wind 10 to 15 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
  • Wednesday A 30 percent chance of showers and thunderstorms, mainly after 11am. Mostly sunny, with a high near 98.
  • Wednesday Night A chance of showers and thunderstorms before 11pm, then a slight chance of showers. Mostly cloudy, with a low around 71. Chance of precipitation is 30%.
  • Thursday A slight chance of showers. Partly sunny, with a high near 90.
  • Thursday Night Partly cloudy, with a low around 68.
  • Friday Mostly sunny, with a high near 87.
  • Friday Night Partly cloudy, with a low around 67.
  • Saturday Sunny, with a high near 90.
  • Saturday Night Mostly clear, with a low around 68.
  • Sunday Sunny, with a high near 91.