Eureka, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in St. Louis County, Missouri.
Today
97°F
Mostly Sunny
Mostly sunny, with a high near 97. Heat index values as high as 100. Southwest wind around 6 mph.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 97°F | Mostly Sunny | 6 mph SW | 1% |
| Tonight | 71°F | Partly Cloudy | 2 mph SW | 5% |
| Sunday | 92°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 3 mph W | 34% |
| Sunday Night | 66°F | Showers And Thunderstorms Likely | 3 mph NE | 69% |
| Monday | 77°F | Showers And Thunderstorms Likely | 5 mph NE | 69% |
| Monday Night | 58°F | Chance Showers And Thunderstorms | 2 to 6 mph N | 54% |
| Tuesday | 70°F | Slight Chance Rain Showers then Partly Sunny | 7 mph N | 22% |
| Tuesday Night | 53°F | Mostly Cloudy | 1 to 7 mph N | 3% |
| Wednesday | 72°F | Mostly Sunny | 5 mph N | 1% |
| Wednesday Night | 54°F | Partly Cloudy | 0 to 3 mph N | 0% |
| Thursday | 75°F | Mostly Sunny | 0 to 3 mph N | 1% |
| Thursday Night | 56°F | Mostly Cloudy | 2 mph NE | 4% |
| Friday | 75°F | Partly Sunny | 1 to 5 mph NE | 9% |
| Friday Night | 56°F | Partly Cloudy | 2 mph NE | 7% |
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
Ballwin
Bel-Nor
Bel-Ridge
Bella Villa
Bellefontaine Neighbors
Bellerive Acres
Berkeley
Beverly Hills
Black Jack
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 Sep 19, 2026.