5-day weather forecast St. Louis Oct 20, 2026

23°13° · Sunny

Weather forecast St. Louis Tuesday Oct 20, 2026: sunny, temperature from 13 °C to 23 °C.

Precipitation probability 12%. Wind up to 2.31 m/s (gusts 6.81 m/s). Air humidity 28–52%, atmospheric pressure 769–771 mm Hg, UV index up to 4.6.

Sunrise 07:15
Sunset 18:16
Waxing Gibbous77% illuminated
Moonrise 15:40 · Moonset 01:40
Chart
Table

Forecast from 13 °C to 23 °C and precipitation

Temperature & Precipitation
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Temperature (°C)151515151414141314161819212222232323211918181716
Precipitation (mm/hr)000000000000000000000000

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Cloud cover (%)9410097349980463541628044778537555555555
Rain chance (%)1011114129545673672111111111

Wind speed and direction

Wind & Wind gust
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Wind (m/s)1.812.111.811.611.51.191.311.611.811.51.51.611.811.891.891.811.611.892.112.312.312.192.312.11
Wind gust (m/s)3.613.313.112.891.531.221.331.892.642.251.921.92221.896.811.642.113.113.723.923.924.424
Wind direction (°)SE 126°ESE 121°SE 142°SSE 167°SE 141°SE 145°SE 129°ESE 123°SE 130°ESE 122°ESE 119°ESE 113°ESE 119°ESE 114°SE 126°SE 127°ESE 114°E 97°E 87°E 86°E 86°E 96°ESE 103°ESE 108°

Air humidity

Humidity
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Humidity (%)444647474950515251454036333129282830343840404243

Atmospheric pressure

Pressure
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Pressure (mm Hg)770770770770770770770770770771771771770770770769769769769769769769769769

Ultraviolet index

UV Index
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
UV Index0000000000.61.52.94.14.64.12.91.60.6000000

Air quality & pollen

Air quality
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
PM2.5 (µg/m³)1817.817.216.716.817.618.720.322.920.815.27.97.17.27.16.96.76.79.514.4192224.626.3
PM10 (µg/m³)18.518.217.717.217.31819.32123.821.315.58.37.47.57.57.37.179.814.719.222.324.926.6
Ozone (O₃) (µg/m³)242425262517741330486889105113115109926744261110
NO₂ (µg/m³)43.740.937.533.932.737.24446.339.528.118.211.76.63.10.502.712.927.340.852.763.670.370.4
SO₂ (µg/m³)2.72.321.81.71.71.81.91.81.7234.45.35.34.94.54.34.24.14.24.44.54.3
CO (µg/m³)241247246246252270294315337356355317260215190178189246327375355302265267

St. Louis on the map

Data Sources & Methodology

Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.