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St. Charles, Missouri Weather Forecast

St. Charles County 38.80°N, 90.52°W Pop. 71,028
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Today in St. Charles: moderate rain with a high near 78°F and a low around 63°F. Rain chance 65%. No day tops a 20% rain chance through Wednesday. Cooling trend: highs fall from 78°F today to 66°F by Sunday.

Forecast updated 9:05 AM CDT, Oct 15

Active Weather Alerts

7-Day Forecast for St. Charles

Today 10/15
Moderate rain
78°/63°
65%
Fri 10/16
Partly cloudy
59°/47°
11%
Sat 10/17
Clear sky
59°/39°
8%
Sun 10/18
Clear sky
66°/39°
0%
Mon 10/19
Mostly sunny
70°/42°
0%
Tue 10/20
Clear sky
73°/45°
1%
Wed 10/21
Clear sky
76°/48°
1%
Hourly charts, 15-day outlook and more for St. Charles in Local Wx →

Next 24 Hours

Now3 PM4 PM5 PM6 PM7 PM8 PM9 PM10 PM11 PMFri12 AM1 AM2 AM3 AM4 AM5 AM6 AM7 AM8 AM9 AM10 AM11 AM12 PM1 PM
SkyModerate drizzlePartly cloudyPartly cloudyPartly cloudyMostly sunnyPartly cloudyPartly cloudySlight rainLight drizzleLight drizzleModerate drizzleLight drizzleOvercastOvercastPartly cloudyPartly cloudyPartly cloudyMostly sunnyMostly sunnyMostly sunnyPartly cloudyPartly cloudyPartly cloudyPartly cloudy
Temp77°78°78°77°76°73°70°68°66°63°59°56°53°52°51°50°49°48°47°50°52°54°55°55°
Rain29%17%16%13%13%13%18%41%36%23%11%10%3%3%2%1%2%0%0%0%0%0%0%1%
WindSSW 9SW 10SW 11WSW 11WSW 11WSW 10WSW 12W 15WNW 16NW 16NW 16WNW 16NW 17NW 16NW 16NW 17NW 17NW 17NW 18NW 18NW 18NW 19NW 19NW 18

Growing Conditions

Growing degree days
4,370
since Apr 1, base 50°F
Rain, last 30 days
1.11 in
model analysis
Rain, year to date
43.06 in
since Jan 1
2-inch soil temperature
74°F
yesterday, daily average
Reference ET, last 7 days
0.97 in
FAO-56 grass reference
Through Oct 14. Season totals use model analysis for this point and update every morning. Soil, ET and spray tools for St. Charles →

Current Stats & Observations

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NWS Forecast

About St. Charles Weather

St. Charles sits at about 551 feet above sea level in St. Charles County, Missouri. About 71,028 people live in the St. Charles area. Official forecasts and warnings for the area come from the National Weather Service LSX office, and the nearest NEXRAD radar site is KLSX. The city is in USDA plant hardiness zone 6b, where the coldest winter night typically falls between -5 to 0°F. Over the past ten years the last spring freeze has come around Apr 15 and the first fall freeze around Nov 5.

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All Missouri forecasts (15) → All states → Interactive forecast tools →