San Marcos, CA
Climate overview — based on NOAA 1991-2020 normals from ESCONDIDO #2, CA US.
Year-round temperatures (°F)
Climate summary
San Marcos has an annual average temperature of 65.8°F with about 14.5 inches of precipitation per year. The warmest month is August (average high 89.0°F), and the coldest is December (average low 43.8°F). February is typically the wettest month (3.57 in) and August the driest (0.06 in).
Best time to visit San Marcos
Full guide →Climate change signal
All-time records →128 of 366 (35%) of San Marcos'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.
| 1970s | 18 | |
| 1980s | 64 | |
| 1990s | 75 | |
| 2000s | 51 | |
| 2010s | 85 | |
| 2020s | 73 |
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 | 68.8°F | 44.8°F | 56.8°F | 3.19 in | — | 6 |
| February | 68.7°F | 45.9°F | 57.3°F | 3.57 in | — | 7 |
| March | 71.0°F | 48.9°F | 59.9°F | 2.20 in | — | 6 |
| April | 74.2°F | 51.8°F | 63.0°F | 0.99 in | — | 4 |
| May | 76.7°F | 56.4°F | 66.6°F | 0.35 in | — | 3 |
| June | 81.9°F | 60.2°F | 71.1°F | 0.09 in | — | 1 |
| July | 87.2°F | 64.4°F | 75.8°F | 0.12 in | — | 1 |
| August | 89.0°F | 65.3°F | 77.2°F | 0.06 in | — | 0 |
| September | 86.9°F | 63.1°F | 75.0°F | 0.16 in | — | 1 |
| October | 80.8°F | 57.3°F | 69.1°F | 0.57 in | — | 2 |
| November | 74.6°F | 49.1°F | 61.9°F | 1.08 in | — | 4 |
| December | 68.0°F | 43.8°F | 55.9°F | 2.14 in | — | 6 |
Climate twins of San Marcos
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).