Weather without the clutter.
Get the St. Louis MO weather forecast without ads, cookies, or tracking. Open-Meteo data, 10-day forecast, hourly conditions, and radar — all free. click here to hide this
July is the hottest month in St. Louis MO, with an average high of 90°F / 32°C; January is the coldest (40°F / 5°C). May is the wettest month, averaging 4.8 in / 123 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 40 / 5 | 24 / -4 | 2.6 / 66 | 7 |
| Feb | 46 / 8 | 28 / -2 | 2.2 / 57 | 6 |
| Mar | 56 / 14 | 37 / 3 | 3.5 / 89 | 9 |
| Apr | 68 / 20 | 47 / 9 | 4.7 / 120 | 9 |
| May | 77 / 25 | 58 / 15 | 4.8 / 123 | 10 |
| Jun | 86 / 30 | 67 / 20 | 4.5 / 114 | 8 |
| Jul | 90 / 32 | 71 / 22 | 3.9 / 100 | 7 |
| Aug | 88 / 31 | 70 / 21 | 3.4 / 86 | 7 |
| Sep | 81 / 27 | 61 / 16 | 3.0 / 75 | 5 |
| Oct | 69 / 21 | 49 / 10 | 3.1 / 80 | 7 |
| Nov | 55 / 13 | 38 / 3 | 3.4 / 87 | 7 |
| Dec | 44 / 7 | 29 / -2 | 2.5 / 64 | 7 |
Extremes since 1938: highest 115°F / 46°C (July 14, 1954), lowest -18°F / -28°C (January 20, 1985).
Daylight lasts about 14.7 hours in June and 9.3 hours in December.
Data: Meteostat — Lambert-St Louis International Airport, 1991–2020 averages.
No cookies. No tracking. No ads.
This site does not use cookies, does not track your location, and does not collect any personal information. We don't use analytics, fingerprinting, or any form of user tracking.
When you search for a city or zip code, the coordinates of that location (not your personal location) are sent to the following third-party services to retrieve weather data:
alerts-proxy) so the API key isn't exposed in the browser. The proxy receives only your coordinates and returns alert text. Our code does not log your IP, and Google Cloud logging exclusions are configured so the platform's default access logs are not retained.pollen-proxy) for the same reason, with the same no-IP-logging configuration.Location button: if you tap the location pin next to the search box, your browser asks for your permission first — the site never requests your location on its own. Your coordinates are rounded to roughly 1 km inside your browser before use, are sent only to the same weather services listed above (exactly as if you had typed a city name), and never touch a server of ours. Note that your browser itself may use its vendor's location service (for example, Google's in Chrome) to work out your position. The "use my location automatically" setting only takes effect on visits where you have already granted permission.
Your preferences (dark mode, temperature units, time format, language, visual style, and section layout) are saved in your browser's local storage (not a cookie) so they persist between visits. Pollen data is also cached locally to reduce unnecessary API calls. You can clear all of this anytime by clearing your browser data.
Your phone might ask you to "Install this page", which means creating a shortcut to a website on your home screen, known as a Progressive Web App (PWA). This makes the site act like a native app, allowing it to load faster, and appear with your other apps on your home screen.
This site is open source and supported by tips from our visitors. No data is sold, shared, or monetized in any way. If you think this is awesome, please consider clicking here to support us.