Genoa, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Genoa, a city in Dekalb County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. Southwest wind around 10 mph.
7-day forecast for Genoa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 10 mph SW | 1% |
| Tonight | 66°F | Slight Chance Showers And Thunderstorms | 5 mph WSW | 63% |
| Wednesday | 77°F | Showers And Thunderstorms Likely | 5 mph WSW | 74% |
| Wednesday Night | 61°F | Showers And Thunderstorms | 0 to 5 mph NW | 80% |
| Thursday | 79°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 50% |
| Thursday Night | 59°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 17% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SSE | 6% |
| Friday Night | 62°F | Mostly Clear | 0 to 5 mph SSW | 9% |
| Saturday | 83°F | Mostly Sunny | 5 to 10 mph SSW | 11% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 19% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 19% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 42% |
| Monday | 84°F | Chance Rain Showers | 5 to 10 mph SSW | 41% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph WNW | 45% |
Forecast source: National Weather Service (api.weather.gov) for Genoa (42.091, -88.695). Updated through the day.
Growing snapshot for Genoa
Last spring frost
Apr 28
First fall frost
Oct 12
Growing season
166 days
Hardiness zone
5b
More local growing data for Genoa: nearby ZIP 60135 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Cortland
DeKalb
Hinckley
Kingston
Kirkland
Lake Holiday
Malta
Sandwich
Shabbona
Somonauk
Sycamore
Waterman
Climate data from the nearest NOAA station, Marengo, Il (10.9 mi from Genoa). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.