| National Weather Service Forecast for:
Rancho Santa Margarita CA Issued by: National Weather Service San Diego, CA |
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| Updated: 12:34 am PDT Aug 20, 2026 | ||||||||||||||||||
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| Overnight |
Mostly clear, with a low around 65. Calm wind. |
| Thursday |
Mostly sunny, with a high near 91. Calm wind becoming southwest around 5 mph in the afternoon. |
| Thursday Night |
Partly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm. |
| Friday |
Sunny, with a high near 91. Calm wind becoming southwest around 5 mph in the afternoon. |
| Friday Night |
Mostly clear, with a low around 66. Calm wind. |
| Saturday |
Sunny, with a high near 92. |
| Saturday Night |
Mostly clear, with a low around 66. |
| Sunday |
Sunny, with a high near 92. |
| Sunday Night |
Mostly clear, with a low around 66. |
| Monday |
Sunny, with a high near 93. |
| Monday Night |
Mostly clear, with a low around 67. |
| Tuesday |
Sunny, with a high near 95. |
| Tuesday Night |
Mostly clear, with a low around 68. |
| Wednesday |
Sunny, with a high near 94. |
Forecast from NOAA-NWS for Rancho Santa Margarita CA.
