St Louis, Missouri weather in January

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

Average high: 39°F
Average low: 24°F
Rainy days: ~8 per month
Total precipitation: 3.0 in
Warmest recorded: 69°F
Coldest recorded: -7°F

Expect January days in St Louis, Missouri to top out around 39°F and cool to about 24°F overnight, with roughly 8 days of measurable rain across the month. In recent years January has ranged from -7°F to 69°F.

Other months

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