5-day weather forecast St. Louis Sep 30, 2026

33°22° · Overcast

Weather forecast St. Louis Wednesday Sep 30, 2026: overcast, temperature from 22 °C to 33 °C.

Precipitation probability 11%. Wind up to 6.61 m/s (gusts 13.69 m/s). Air humidity 31–46%, atmospheric pressure 756–759 mm Hg, UV index up to 6.4.

Sunrise 06:55
Sunset 18:45
Waning Gibbous75% illuminated
Moonrise 20:43 · Moonset 11:14
Chart
Table

Forecast from 22 °C to 33 °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)252424232323222222232629313233313232313030292828
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 (%)911001001001001009810010062691001001001001001001009810010010097100
Rain chance (%)9101010101010101055999999991010101011

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)3.393.894.614.814.614.193.613.614.194.695.6965.896.116.316.616.115.395.314.113.813.53.393.19
Wind gust (m/s)9.6111.2213.2213.6913.2212.611211.1112.7213.1411.9210.5310.429.729.399.699.819.319.539.319.8310.819.6110.89
Wind direction (°)SSE 149°SSE 153°SSE 162°SSE 161°SSE 168°SSE 166°SSE 164°SSE 159°SSE 159°S 172°S 179°S 182°S 182°S 191°SSW 200°SSW 198°S 183°S 182°S 176°S 171°S 187°S 181°S 178°S 183°

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 (%)373837383738394140363331323232343332343740424346

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)758758758758758758758759759759759759758758757757757756756756757757757758

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 Index000000000.212.44.15.56.45.73.820.60.200000

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)7.37.37.47.57.57.57.57.788.2887.97.47.27.27.17.27.57.87.77.67.57.4
PM10 (µg/m³)7.67.67.67.67.67.77.77.98.18.38.18.287.57.37.37.27.37.77.97.87.77.67.4
Ozone (O₃) (µg/m³)6263626159565353576375971251431461401311201069796100102100
NO₂ (µg/m³)17.415.314.213.613.4141515.214.212.410.47.95.13.12.222.74.97.99.89.78.57.57.2
SO₂ (µg/m³)222.12.22.32.42.42.52.52.52.62.833.132.72.52.221.81.71.81.81.8
CO (µg/m³)171170165159156158164169175182184177166157151148148155167174173167163162

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.