| National Weather Service Forecast for:
Rancho Cucamonga CA Issued by: National Weather Service San Diego, CA |
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| Updated: 11:54 am PDT Sep 12, 2026 | ||||||||||||||||||
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| Tonight |
Mostly clear, with a low around 67. West wind around 5 mph becoming calm after midnight. |
| Sunday |
Sunny, with a high near 91. Light south wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph. |
| Sunday Night |
Mostly clear, with a low around 65. Southwest wind 5 to 10 mph becoming light northwest after midnight. |
| Monday |
Sunny, with a high near 89. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph. |
| Monday Night |
Mostly clear, with a low around 63. Southwest wind 5 to 10 mph becoming light west after midnight. |
| Tuesday |
Sunny, with a high near 85. |
| Tuesday Night |
Clear, with a low around 61. |
| Wednesday |
Sunny, with a high near 86. |
| Wednesday Night |
Clear, with a low around 62. |
| Thursday |
Sunny, with a high near 91. |
| Thursday Night |
Clear, with a low around 65. |
| Friday |
Sunny, with a high near 96. |
| Friday Night |
Clear, with a low around 69. |
| Saturday |
Sunny, with a high near 97. |
Forecast from NOAA-NWS for Rancho Cucamonga CA.
