Crystal Lake Park, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Crystal Lake Park, a city in St. Louis County, Missouri.
Today
90°F
Sunny
Sunny, with a high near 90. Southeast wind around 3 mph.
7-day forecast for Crystal Lake Park
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Sunny | 3 mph SE | 0% |
| Tonight | 70°F | Mostly Clear | 5 mph SE | 0% |
| Wednesday | 91°F | Sunny | 6 mph S | 10% |
| Wednesday Night | 72°F | Slight Chance Showers And Thunderstorms | 7 mph S | 67% |
| Thursday | 88°F | Showers And Thunderstorms Likely | 5 mph S | 68% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 5 mph SE | 30% |
| Friday | 88°F | Chance Showers And Thunderstorms | 3 mph SW | 30% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 3 mph S | 27% |
| Saturday | 90°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph SW | 27% |
| Saturday Night | 73°F | Mostly Clear | 6 mph S | 7% |
| Sunday | 93°F | Sunny | 5 to 8 mph SW | 6% |
| Sunday Night | 75°F | Mostly Clear | 7 mph S | 5% |
| Monday | 95°F | Sunny | 8 mph SW | 5% |
| Monday Night | 76°F | Slight Chance Showers And Thunderstorms | 8 mph S | 16% |
Forecast source: National Weather Service (api.weather.gov) for Crystal Lake Park (38.621, -90.432). Updated through the day.
Growing snapshot for Crystal Lake Park
Last spring frost
Apr 4
First fall frost
Oct 29
Growing season
206 days
Hardiness zone
7a
More local growing data for Crystal Lake Park: nearby ZIP 63131 weather · frost dates · planting calendar · Missouri frost dates
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Climate data from the nearest NOAA station, St Charles 7 Ssw, Mo (6.5 mi from Crystal Lake Park). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.