| National Weather Service Forecast for:
Fountain Valley 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 |
Mostly cloudy, with a low around 68. South wind around 5 mph. |
| Sunday |
Mostly sunny, with a high near 82. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. |
| Sunday Night |
Partly cloudy, with a low around 67. Southwest wind around 5 mph becoming east after midnight. |
| Monday |
Mostly sunny, with a high near 79. East wind 5 to 10 mph becoming south in the afternoon. |
| Monday Night |
Partly cloudy, with a low around 65. South wind 5 to 10 mph. |
| Tuesday |
Sunny, with a high near 79. |
| Tuesday Night |
Increasing clouds, with a low around 64. |
| Wednesday |
Partly sunny, then gradually becoming sunny, with a high near 80. |
| Wednesday Night |
Mostly clear, with a low around 64. |
| Thursday |
Sunny, with a high near 79. |
| Thursday Night |
Clear, with a low around 65. |
| Friday |
Sunny, with a high near 83. |
| Friday Night |
Clear, with a low around 67. |
| Saturday |
Sunny, with a high near 86. |
Forecast from NOAA-NWS for Fountain Valley CA.
