St. Louis, MO Weather & Growing Conditions
This Afternoon
99°F
Partly Sunny
Partly sunny, with a high near 99. Heat index values as high as 103. West wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 99°F | Partly Sunny | 7 mph W | 5% |
| Tonight | 75°F | Partly Cloudy | 5 mph S | 1% |
| Sunday | 95°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 6 mph W | 18% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 9 mph NE | 71% |
| Monday | 82°F | Showers And Thunderstorms Likely | 5 to 8 mph NE | 71% |
| Monday Night | 63°F | Chance Showers And Thunderstorms | 5 to 9 mph NE | 47% |
| Tuesday | 73°F | Slight Chance Rain Showers then Partly Sunny | 7 to 12 mph N | 18% |
| Tuesday Night | 56°F | Mostly Cloudy | 5 to 12 mph N | 5% |
| Wednesday | 75°F | Mostly Sunny | 9 mph N | 1% |
| Wednesday Night | 57°F | Partly Cloudy | 3 to 8 mph N | 0% |
| Thursday | 77°F | Mostly Sunny | 3 to 7 mph N | 1% |
| Thursday Night | 60°F | Partly Cloudy | 2 to 7 mph NE | 3% |
| Friday | 79°F | Partly Sunny | 3 to 7 mph NE | 6% |
| Friday Night | 60°F | Partly Cloudy | 6 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Louis, MO
Last spring frost
Apr 1
First fall frost
Nov 4
Growing season
218 days
Hardiness zone
7a
Explore more for St. Louis, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, St Louis Sci Ctr, Mo (4.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.