Olmsted, IL Weather & Growing Conditions
This Afternoon
78°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5pm. Partly sunny. High near 78, with temperatures falling to around 74 in the afternoon. South southeast wind 15 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Slight Chance Showers And Thunderstorms | 15 to 20 mph SSE | 18% |
| Tonight | 57°F | Showers And Thunderstorms | 7 to 13 mph S | 99% |
| Wednesday | 68°F | Partly Sunny | 3 to 9 mph WSW | 8% |
| Wednesday Night | 43°F | Mostly Clear | 2 mph SW | 0% |
| Thursday | 68°F | Sunny | 1 to 6 mph SW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 2 mph W | 4% |
| Friday | 62°F | Partly Sunny | 2 to 8 mph NNW | 1% |
| Friday Night | 39°F | Partly Cloudy | 5 mph NNW | 1% |
| Saturday | 58°F | Mostly Sunny | 5 mph N | 0% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph NNW | 1% |
| Sunday | 62°F | Sunny | 1 to 5 mph WNW | 5% |
| Sunday Night | 35°F | Mostly Clear | 2 mph NW | 6% |
| Monday | 64°F | Sunny | 1 to 6 mph W | 1% |
| Monday Night | 37°F | Mostly Clear | 2 mph SW | 0% |
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 (3.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.