Crystal City, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Crystal City, a city in Jefferson County, Missouri.
Today
88°F
Sunny
Sunny, with a high near 88. Southeast wind 2 to 6 mph.
7-day forecast for Crystal City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 2 to 6 mph SE | 0% |
| Tonight | 66°F | Mostly Clear | 1 to 6 mph SE | 0% |
| Wednesday | 93°F | Sunny | 3 mph S | 6% |
| Wednesday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 mph S | 56% |
| Thursday | 89°F | Showers And Thunderstorms Likely | 3 mph S | 65% |
| Thursday Night | 69°F | Chance Showers And Thunderstorms | 2 mph S | 47% |
| Friday | 89°F | Chance Showers And Thunderstorms | 2 mph SW | 47% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 2 mph SW | 39% |
| Saturday | 91°F | Chance Showers And Thunderstorms | 2 mph S | 39% |
| Saturday Night | 71°F | Mostly Clear | 3 mph S | 10% |
| Sunday | 94°F | Sunny | 5 mph SW | 7% |
| Sunday Night | 73°F | Mostly Clear | 5 mph S | 5% |
| Monday | 96°F | Sunny | 6 mph SW | 5% |
| Monday Night | 74°F | Mostly Clear | 6 mph SW | 9% |
Forecast source: National Weather Service (api.weather.gov) for Crystal City (38.223, -90.382). Updated through the day.
Growing snapshot for Crystal City
Last spring frost
Apr 9
First fall frost
Oct 26
Growing season
197 days
Hardiness zone
7a
More local growing data for Crystal City: nearby ZIP 63019 weather · frost dates · planting calendar · Missouri frost dates
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Summer Set
Climate data from the nearest NOAA station, Festus, Mo (1.3 mi from Crystal City). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.