San Marcos, California Climate by Month
San Marcos, California, United States
Hot summers and mild winters, with little rain, mostly from November to March.
San Marcos has hot summers and mild winters, with little rain, mostly from November to March. Afternoon highs range from 68°F (20°C) in February to 87°F (31°C) in August, and December nights average 43°F (6°C). It gets only 13 in (319 mm) of rain a year. June to September are almost completely dry.
- Warmest month
- 87°F(31°C)
- Average high, August
- Coldest nights
- 43°F(6°C)
- Average low, December
- Rain per year
- 13 in(319 mm)
- Wettest: February
- Humidity
- 55%
- Sunniest: June
Best and worst months in San Marcos
Best for weatherThe most comfortable weather comes in May and November, with highs around 75°F (24°C) and about 0.9 in (22 mm) of rain a month.
Least pleasantFebruary and August are the least pleasant; August is the hottest, with highs of 87°F (31°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Marcos weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 68°F(20°C) | 44°F(6°C) | 2.3 in(59 mm) | 52% | 3.0 |
| FebFebruary | 68°F(20°C) | 44°F(7°C) | 2.5 in(64 mm) | 58% | 3.5 |
| MarMarch | 70°F(21°C) | 46°F(8°C) | 1.7 in(43 mm) | 61% | 5.0 |
| AprApril | 73°F(23°C) | 49°F(10°C) | 1.2 in(30 mm) | 54% | 6.0 |
| MayMayBest | 75°F(24°C) | 54°F(12°C) | 0.4 in(10 mm) | 58% | 6.4 |
| JunJune | 80°F(27°C) | 57°F(14°C) | 0.1 in(2 mm) | 59% | 6.9 |
| JulJuly | 85°F(30°C) | 61°F(16°C) | 0.1 in(2 mm) | 58% | 6.8 |
| AugAugust | 87°F(31°C) | 62°F(17°C) | 0.1 in(3 mm) | 57% | 6.6 |
| SepSeptember | 86°F(30°C) | 61°F(16°C) | 0.2 in(5 mm) | 54% | 5.5 |
| OctOctober | 81°F(27°C) | 55°F(13°C) | 0.4 in(10 mm) | 51% | 4.3 |
| NovNovemberBest | 75°F(24°C) | 48°F(9°C) | 1.3 in(34 mm) | 49% | 3.4 |
| DecDecember | 68°F(20°C) | 43°F(6°C) | 2.2 in(57 mm) | 53% | 2.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate outside the United States
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