| National Weather Service Forecast for:
Fontana CA Issued by: National Weather Service San Diego, CA |
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| Updated: 12:18 am PDT Sep 13, 2026 | ||||||||||||||||||
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| Overnight |
Partly cloudy, with a low around 68. Calm wind. |
| Sunday |
Patchy fog before 11am. Otherwise, sunny, with a high near 90. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. |
| Sunday Night |
Clear, with a low around 66. Southwest wind 5 to 10 mph becoming light and variable in the evening. |
| Monday |
Sunny, with a high near 90. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. |
| Monday Night |
Mostly clear, with a low around 64. Southwest wind 5 to 10 mph becoming light after midnight. |
| Tuesday |
Sunny, with a high near 87. |
| Tuesday Night |
Mostly clear, with a low around 62. |
| Wednesday |
Sunny, with a high near 90. |
| Wednesday Night |
Clear, with a low around 62. |
| Thursday |
Sunny, with a high near 90. |
| Thursday Night |
Clear, with a low around 65. |
| Friday |
Sunny, with a high near 94. |
| Friday Night |
Clear, with a low around 68. |
| Saturday |
Sunny, with a high near 97. |
Forecast from NOAA-NWS for Fontana CA.
