Black Jack, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Black Jack, a city in St. Louis County, Missouri.
This Afternoon
97°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 97. Heat index values as high as 104. Southeast wind around 3 mph. Chance of precipitation is 30%.
7-day forecast for Black Jack
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 97°F | Chance Showers And Thunderstorms | 3 mph SE | 26% |
| Tonight | 75°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 6 mph SE | 23% |
| Saturday | 98°F | Mostly Sunny | 5 to 8 mph SW | 6% |
| Saturday Night | 75°F | Partly Cloudy | 6 mph SW | 3% |
| Sunday | 93°F | Chance Rain Showers then Chance Showers And Thunderstorms | 7 mph W | 25% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 8 mph N | 64% |
| Monday | 80°F | Rain Showers Likely | 7 to 12 mph N | 71% |
| Monday Night | 61°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 8 to 12 mph N | 71% |
| Tuesday | 73°F | Slight Chance Rain Showers then Mostly Cloudy | 13 mph N | 23% |
| Tuesday Night | 56°F | Mostly Cloudy | 6 to 12 mph N | 5% |
| Wednesday | 75°F | Mostly Sunny | 9 mph N | 2% |
| Wednesday Night | 57°F | Partly Cloudy | 3 to 8 mph N | 1% |
| Thursday | 76°F | Mostly Sunny | 5 to 8 mph N | 3% |
| Thursday Night | 60°F | Partly Cloudy | 3 to 7 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Black Jack (38.799, -90.263). Updated through the day.
Growing snapshot for Black Jack
Last spring frost
Apr 2
First fall frost
Nov 4
Growing season
215 days
Hardiness zone
7a
More local growing data for Black Jack: nearby ZIP 63033 weather · frost dates · planting calendar · Missouri frost dates
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Climate data from the nearest NOAA station, St Louis Lambert Intl Ap, Mo (6.2 mi from Black Jack). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.