St Louis, Missouri weather in May

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

Average high: 76°F
Average low: 57°F
Rainy days: ~14 per month
Total precipitation: 5.7 in
Warmest recorded: 90°F
Coldest recorded: 40°F

Expect May days in St Louis, Missouri to top out around 76°F and cool to about 57°F overnight, with roughly 14 days of measurable rain across the month. In recent years May has ranged from 40°F to 90°F.

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Current St Louis, Missouri forecast → · Historical data by Open-Meteo (ERA5).