Barnhart, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Barnhart, a community in Jefferson County, Missouri.
Overnight
64°F
Clear
Clear, with a low around 64. Southeast wind around 1 mph.
7-day forecast for Barnhart
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 64°F | Clear | 1 mph SE | 0% |
| Tuesday | 89°F | Sunny | 3 mph SE | 0% |
| Tuesday Night | 67°F | Mostly Clear | 3 mph S | 0% |
| Wednesday | 91°F | Sunny | 3 mph S | 7% |
| Wednesday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 mph S | 59% |
| Thursday | 88°F | Showers And Thunderstorms Likely | 3 mph S | 66% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 45% |
| Friday | 88°F | Chance Showers And Thunderstorms | 3 mph SW | 45% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 2 mph SW | 38% |
| Saturday | 90°F | Chance Showers And Thunderstorms | 3 mph SW | 38% |
| Saturday Night | 72°F | Mostly Clear | 5 mph S | 8% |
| Sunday | 93°F | Sunny | 5 mph SW | 7% |
| Sunday Night | 74°F | Mostly Clear | 6 mph S | 6% |
| Monday | 95°F | Sunny | 6 mph SW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Barnhart (38.337, -90.403). Updated through the day.
Growing snapshot for Barnhart
Last spring frost
Apr 9
First fall frost
Oct 26
Growing season
197 days
Hardiness zone
7a
More local growing data for Barnhart: nearby ZIP 63053 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
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Herculaneum
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Hillsboro
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Kimmswick
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Olympian Village
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Peaceful Village
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Raintree Plantation
Scotsdale
Summer Set
Climate data from the nearest NOAA station, Festus, Mo (9.4 mi from Barnhart). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.