| National Weather Service Forecast for:
Fullerton 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. Calm wind. |
| Sunday |
Mostly cloudy through mid morning, then gradual clearing, with a high near 86. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. |
| Sunday Night |
Increasing clouds, with a low around 67. South wind around 5 mph becoming east after midnight. |
| Monday |
Partly sunny, then gradually becoming sunny, with a high near 84. Southeast wind 5 to 10 mph becoming southwest in the afternoon. |
| Monday Night |
Mostly clear, with a low around 65. Southwest wind around 5 mph becoming southeast after midnight. |
| Tuesday |
Sunny, with a high near 85. |
| Tuesday Night |
Increasing clouds, with a low around 64. |
| Wednesday |
Sunny, with a high near 83. |
| Wednesday Night |
Mostly clear, with a low around 64. |
| Thursday |
Sunny, with a high near 84. |
| Thursday Night |
Clear, with a low around 65. |
| Friday |
Sunny, with a high near 89. |
| Friday Night |
Clear, with a low around 67. |
| Saturday |
Sunny, with a high near 91. |
Forecast from NOAA-NWS for Fullerton CA.
