Rancho Santa Margarita, CA
Climate overview — based on NOAA 1991-2020 normals from IRVINE RCH, CA US.
Year-round temperatures (°F)
Climate summary
Rancho Santa Margarita has an annual average temperature of 66.7°F with about 13.1 inches of precipitation per year. The warmest month is August (average high 90.2°F), and the coldest is December (average low 47.6°F). February is typically the wettest month (3.47 in) and August the driest (0.01 in).
Best time to visit Rancho Santa Margarita
Full guide →Climate change signal
All-time records →164 of 366 (44.8%) of Rancho Santa Margarita's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 2000s | 122 | |
| 2010s | 181 | |
| 2020s | 63 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 69.0°F | 48.6°F | 58.8°F | 2.67 in | — | 4 |
| February | 70.5°F | 47.9°F | 59.2°F | 3.47 in | — | 4 |
| March | 73.1°F | 49.7°F | 61.4°F | 1.70 in | — | 3 |
| April | 76.4°F | 51.9°F | 64.1°F | 0.85 in | — | 2 |
| May | 79.4°F | 55.5°F | 67.4°F | 0.34 in | — | 2 |
| June | 82.5°F | 58.7°F | 70.6°F | 0.04 in | — | 0 |
| July | 88.1°F | 61.9°F | 75.0°F | 0.09 in | — | 0 |
| August | 90.2°F | 62.2°F | 76.2°F | 0.01 in | — | 0 |
| September | 88.8°F | 61.7°F | 75.3°F | 0.10 in | — | 0 |
| October | 84.3°F | 57.8°F | 71.1°F | 0.62 in | — | 2 |
| November | 75.6°F | 52.5°F | 64.0°F | 0.83 in | — | 2 |
| December | 67.8°F | 47.6°F | 57.7°F | 2.34 in | — | 4 |
Climate twins of Rancho Santa Margarita
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).