San Antonio, Texas weather in March

Averages from 2021–2025 (155 days of record).

Average high: 78°F
Average low: 55°F
Rainy days: ~9 per month
Total precipitation: 2.3 in
Warmest recorded: 95°F
Coldest recorded: 29°F

Expect March days in San Antonio, Texas to top out around 78°F and cool to about 55°F overnight, with roughly 9 days of measurable rain across the month. In recent years March has ranged from 29°F to 95°F.

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Current San Antonio, Texas forecast → · Historical data by Open-Meteo (ERA5).