San Marcos, Texas Climate by Month
San Marcos, Texas, United States
Very hot summers and cool winters, with rain spread through the year.
Very hot summers and cool winters, with rain spread through the year: that's San Marcos's climate in short. August is the warmest month, with highs around 97°F (36°C); January is the coolest at 63°F (17°C), and nights dip to 40°F (4°C). About 36 in (908 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 97°F(36°C)
- Average high, August
- Coldest nights
- 40°F(4°C)
- Average low, January
- Rain per year
- 36 in(908 mm)
- No clear rainy season
- Humidity
- 65%
- Sunniest: July
Best and worst months in San Marcos
Best for weatherMarch is the best time for weather in San Marcos: highs near 73°F (23°C) and about 1.9 in (49 mm) of rain a month.
Least pleasantJune and August are the least pleasant; August is the hottest, with highs of 97°F (36°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 March.
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 | 63°F(17°C) | 40°F(4°C) | 2.4 in(60 mm) | 62% | 2.7 |
| FebFebruary | 67°F(19°C) | 43°F(6°C) | 2.4 in(60 mm) | 68% | 3.2 |
| MarMarchBest | 73°F(23°C) | 50°F(10°C) | 1.9 in(49 mm) | 69% | 4.1 |
| AprApril | 80°F(27°C) | 56°F(14°C) | 2.5 in(64 mm) | 68% | 5.3 |
| MayMay | 86°F(30°C) | 65°F(18°C) | 4.4 in(113 mm) | 69% | 5.8 |
| JunJune | 92°F(34°C) | 72°F(22°C) | 4.6 in(117 mm) | 67% | 6.5 |
| JulJuly | 96°F(36°C) | 74°F(23°C) | 2.1 in(53 mm) | 61% | 6.8 |
| AugAugust | 97°F(36°C) | 73°F(23°C) | 2.7 in(68 mm) | 58% | 6.3 |
| SepSeptember | 91°F(33°C) | 68°F(20°C) | 3.7 in(95 mm) | 61% | 5.3 |
| OctOctober | 83°F(28°C) | 58°F(15°C) | 3.5 in(88 mm) | 63% | 4.0 |
| NovNovember | 72°F(22°C) | 48°F(9°C) | 3.1 in(79 mm) | 68% | 2.9 |
| DecDecember | 64°F(18°C) | 41°F(5°C) | 2.4 in(62 mm) | 67% | 2.5 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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