Genoa, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Genoa, a city in Dekalb County, Illinois.
This Afternoon
71°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a high near 71. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Genoa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Chance Rain Showers | 10 to 15 mph E | 51% |
| Tonight | 62°F | Slight Chance Rain Showers then Showers And Thunderstorms Likely | 10 mph E | 58% |
| Saturday | 76°F | Showers And Thunderstorms Likely | 5 to 10 mph SE | 90% |
| Saturday Night | 63°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NE | 79% |
| Sunday | 67°F | Showers And Thunderstorms | 10 to 20 mph NE | 76% |
| Sunday Night | 54°F | Rain Showers Likely | 15 mph NE | 55% |
| Monday | 64°F | Chance Rain Showers | 15 to 20 mph ENE | 44% |
| Monday Night | 50°F | Chance Rain Showers | 10 to 15 mph ENE | 37% |
| Tuesday | 63°F | Slight Chance Rain Showers | 10 to 15 mph NE | 24% |
| Tuesday Night | 48°F | Mostly Cloudy | 5 to 15 mph NE | 11% |
| Wednesday | 66°F | Partly Sunny | 5 to 15 mph NNE | 6% |
| Wednesday Night | 49°F | Mostly Cloudy | 0 to 10 mph NNE | 5% |
| Thursday | 69°F | Partly Sunny | 5 to 10 mph NNE | 4% |
| Thursday Night | 51°F | Mostly Cloudy | 0 to 5 mph NNE | 4% |
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 Sep 18, 2026.