Eureka, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in St. Louis County, Missouri.
Overnight
66°F
Clear
Clear, with a low around 66. East wind around 1 mph.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Clear | 1 mph E | 0% |
| Tuesday | 88°F | Sunny | 2 mph SE | 0% |
| Tuesday Night | 67°F | Mostly Clear | 2 mph SE | 0% |
| Wednesday | 90°F | Sunny | 3 mph S | 10% |
| Wednesday Night | 70°F | Slight Chance Showers And Thunderstorms | 3 mph S | 65% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 3 mph S | 67% |
| Thursday Night | 69°F | Chance Showers And Thunderstorms | 2 mph S | 36% |
| Friday | 87°F | Chance Showers And Thunderstorms | 2 mph SW | 36% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 1 mph SW | 29% |
| Saturday | 89°F | Chance Showers And Thunderstorms then Mostly Sunny | 2 mph SW | 29% |
| Saturday Night | 71°F | Mostly Clear | 2 mph S | 7% |
| Sunday | 91°F | Sunny | 5 mph SW | 5% |
| Sunday Night | 72°F | Mostly Clear | 3 mph S | 5% |
| Monday | 93°F | Sunny | 5 mph SW | 5% |
Forecast source: National Weather Service (api.weather.gov) for Eureka (38.498, -90.645). Updated through the day.
Growing snapshot for Eureka
Last spring frost
Apr 12
First fall frost
Oct 23
Growing season
193 days
Hardiness zone
6b
More local growing data for Eureka: nearby ZIP 63025 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Affton
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Bel-Nor
Bel-Ridge
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Bellefontaine Neighbors
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Breckenridge Hills
Brentwood
Bridgeton
Calverton Park
Castle Point
Champ
Charlack
Chesterfield
Clarkson Valley
Clayton
Concord
Cool Valley
Country Club Hills
Country Life Acres
Crestwood
Creve Coeur
Crystal Lake Park
Dellwood
Des Peres
Edmundson
Climate data from the nearest NOAA station, St Louis Sprt Of S L Ap, Mo (11.7 mi from Eureka). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.