Olmsted, IL Weather & Growing Conditions
Tonight
72°F
Mostly Clear
Mostly clear, with a low around 72. Southeast wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 72°F | Mostly Clear | 1 mph SE | 5% |
| Saturday | 98°F | Sunny | 1 to 5 mph SW | 2% |
| Saturday Night | 72°F | Partly Cloudy | 2 mph SSW | 0% |
| Sunday | 97°F | Sunny | 2 to 6 mph WSW | 2% |
| Sunday Night | 71°F | Partly Cloudy | 3 mph NNW | 4% |
| Monday | 91°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph N | 39% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 3 to 7 mph N | 39% |
| Tuesday | 80°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 6 to 10 mph N | 23% |
| Tuesday Night | 60°F | Partly Cloudy | 5 to 10 mph N | 8% |
| Wednesday | 78°F | Mostly Sunny | 7 mph N | 3% |
| Wednesday Night | 58°F | Partly Cloudy | 2 to 6 mph NNE | 2% |
| Thursday | 79°F | Mostly Sunny | 3 to 7 mph NNE | 3% |
| Thursday Night | 60°F | Mostly Clear | 2 to 6 mph NNE | 3% |
| Friday | 78°F | Mostly Sunny | 3 to 7 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Olmsted, IL
Last spring frost
Apr 3
First fall frost
Nov 5
Growing season
216 days
Hardiness zone
7a
Explore more for Olmsted, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Grand Chain Dam 53, Il (6.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.