Crystal City, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Crystal City, a city in Jefferson County, Missouri.
Tonight
70°F
Slight Chance Showers And Thunderstorms then Mostly Clear
A slight chance of showers and thunderstorms before 9pm. Mostly clear, with a low around 70. Southeast wind around 2 mph. Chance of precipitation is 20%.
7-day forecast for Crystal City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 mph SE | 19% |
| Saturday | 100°F | Mostly Sunny | 1 to 5 mph SW | 5% |
| Saturday Night | 72°F | Partly Cloudy | 3 mph SW | 0% |
| Sunday | 96°F | Mostly Sunny | 5 mph W | 13% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 3 mph N | 53% |
| Monday | 84°F | Showers And Thunderstorms Likely | 2 to 7 mph N | 65% |
| Monday Night | 59°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 3 to 7 mph N | 65% |
| Tuesday | 75°F | Slight Chance Rain Showers then Mostly Cloudy | 8 mph N | 19% |
| Tuesday Night | 53°F | Mostly Cloudy | 3 to 8 mph N | 7% |
| Wednesday | 76°F | Mostly Sunny | 6 mph N | 2% |
| Wednesday Night | 53°F | Partly Cloudy | 1 to 5 mph N | 2% |
| Thursday | 77°F | Mostly Sunny | 1 to 6 mph N | 3% |
| Thursday Night | 56°F | Partly Cloudy | 1 to 5 mph N | 3% |
| Friday | 78°F | Mostly Sunny | 1 to 6 mph N | 6% |
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
Nearby towns & communities
Arnold
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Byrnes Mill
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Herculaneum
High Ridge
Hillsboro
Horine
Imperial
Kimmswick
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Olympian Village
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Peaceful Village
Pevely
Raintree Plantation
Scotsdale
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 Sep 19, 2026.