Olmsted, IL Weather & Growing Conditions
Today
86°F
Patchy Fog then Sunny
Patchy fog before 8am. Sunny. High near 86, with temperatures falling to around 84 in the afternoon. Northeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Patchy Fog then Sunny | 2 mph NE | 0% |
| Tonight | 65°F | Mostly Clear | 1 mph ENE | 0% |
| Wednesday | 88°F | Sunny | 1 mph S | 0% |
| Wednesday Night | 69°F | Mostly Clear | 1 mph SSE | 0% |
| Thursday | 89°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 1 to 5 mph SSW | 16% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 3 mph S | 50% |
| Friday | 88°F | Chance Showers And Thunderstorms | 5 mph SSW | 50% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 3 mph SSW | 42% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 3 mph SSW | 34% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 mph S | 22% |
| Sunday | 90°F | Mostly Sunny | 2 to 6 mph SSW | 10% |
| Sunday Night | 72°F | Mostly Clear | 5 mph SSW | 8% |
| Monday | 91°F | Sunny | 3 to 7 mph SSW | 5% |
| Monday Night | 73°F | Mostly Clear | 5 mph SSW | 4% |
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 Aug 4, 2026.