St Louis weather in December 2026

Q: How cold is it in St Louis in December?

Daytime temperatures usually reach 6°C in St Louis in December, falling to -5°C at night.

Q: How sunny is it in St Louis in December?

There are normally 5 hours of bright sunshine each day in St Louis in December - that's 48% of daylight hours.

Q: Does it rain in St Louis in December?

There are usually 9 days with some rain in St Louis in December and the average monthly rainfall is 57mm. Rain may fall as snow in this month.

Expect daytime maximum temperatures of 43°F in St Louis, Missouri in December based on long-term weather averages. There are 4 hours of sunshine per day on average with 10 days with some rainfall and typically 2.7 inches of rainfall in the month.

43
43°F max day temperature
4
4 hours of sunshine per day
10
10 days with some rainfall
27
27°F min night temperature
10
10 hours of daylight per day
0
No heat & humidity
2.7
2.7 inches of monthly rainfall
2
2 (Low) UV index

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The December weather guide for Missouri (St Louis) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C) | Imperial (°F)

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How cold is it in St Louis in December?

Daytime temperatures usually reach 43°F in St Louis in December, falling to 23°F at night.

How sunny is it in St Louis in December?

There are normally 5 hours of bright sunshine each day in St Louis in December - that's 48% of daylight hours.

Does it rain in St Louis in December?

There are usually 9 days with some rain in St Louis in December and the average monthly rainfall is 2.2 inches. Rain may fall as snow in this month.