Geneseo, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Geneseo, a city in Henry County, Illinois.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. Southwest wind 5 to 10 mph.
7-day forecast for Geneseo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 to 10 mph SW | 4% |
| Tonight | 68°F | Showers And Thunderstorms Likely | 5 mph SW | 66% |
| Wednesday | 78°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph W | 79% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 5 mph N | 78% |
| Thursday | 79°F | Slight Chance Showers And Thunderstorms | 5 mph NE | 52% |
| Thursday Night | 61°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph E | 15% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SE | 7% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 9% |
| Saturday | 84°F | Sunny | 5 to 10 mph SW | 9% |
| Saturday Night | 71°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 15% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Sunny | 10 to 15 mph SW | 15% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 mph S | 34% |
| Monday | 85°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 34% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph SW | 35% |
Forecast source: National Weather Service (api.weather.gov) for Geneseo (41.451, -90.155). Updated through the day.
Growing snapshot for Geneseo
Last spring frost
Apr 20
First fall frost
Oct 20
Growing season
180 days
Hardiness zone
5b
More local growing data for Geneseo: nearby ZIP 61254 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Geneseo, Il (1.1 mi from Geneseo). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.