| National Weather Service Forecast for:
Fontana CA Issued by: National Weather Service San Diego, CA |
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| Updated: 12:29 am PDT Jun 22, 2026 | ||||||||||||||||||
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| Overnight |
Mostly clear, with a low around 60. Southwest wind around 5 mph becoming calm. |
| Monday |
Sunny, with a high near 89. Light and variable wind becoming west 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 after midnight. Winds could gust as high as 20 mph. |
| Tuesday |
Sunny, with a high near 95. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph. |
| Tuesday Night |
Mostly clear, with a low around 68. Southwest wind 5 to 10 mph becoming light west in the evening. |
| Wednesday |
Mostly sunny, with a high near 95. |
| Wednesday Night |
Mostly clear, with a low around 63. |
| Thursday |
Sunny, with a high near 92. |
| Thursday Night |
Mostly clear, with a low around 61. |
| Friday |
Sunny, with a high near 89. |
| Friday Night |
Clear, with a low around 59. |
| Saturday |
Sunny, with a high near 86. |
| Saturday Night |
Mostly clear, with a low around 58. |
| Sunday |
Mostly sunny, with a high near 81. |
Forecast from NOAA-NWS for Fontana CA.
