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Weather in St. Charles, MO · National Weather Service + NOAA

Weather in St. Charles

St. Charles has chilly winters and warm summers. A typical July afternoon reaches 88°, a January night drops to 22°, and about 9 inches of snow falls in a normal winter. Normal November highs come to 55°, and lows to 36°.

Winter 43°/25°Spring 67°/45°Summer 87°/66°Fall 68°/47°
Right now
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Sunrise 6:30 am · sunset 5:00 pm

Getting the latest forecast from the National Weather Service…

A normal year

Where today sits in St. Charles’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
43° / 25°
3 days with an inch or more of snow
Spring
67° / 45°
Last frost around Apr 8
Summer
87° / 66°
34 days reach 90° in a normal year
Fall now
68° / 47°
First frost around Oct 29
Pastthe usual first frost (Oct 29). Last frost next spring: Apr 8
Best months to be outside
AprMaySepOct
Highs of 62–84° and lows of 40° or more
How much snow does St. Charles get?About 9 inches a winter.When is it wettest?May, with 5.0 inches.Is it warmer than it used to be?+0.8° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in St. Charles.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for St. Charles itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at St Charles Elm Pt, MO (1 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.