Genoa, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Genoa, a city in Dekalb County, Illinois.
This Afternoon
68°F
Rain
Rain and a slight chance of thunderstorms. Mostly cloudy. High near 68, with temperatures falling to around 65 in the afternoon. South wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Genoa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Rain | 15 to 20 mph S | 77% |
| Tonight | 57°F | Rain | 15 mph S | 88% |
| Wednesday | 61°F | Chance Rain | 15 mph SSW | 52% |
| Wednesday Night | 46°F | Slight Chance Rain | 15 mph SW | 23% |
| Thursday | 55°F | Chance Rain | 10 to 15 mph WSW | 40% |
| Thursday Night | 41°F | Chance Rain | 5 to 10 mph NW | 41% |
| Friday | 50°F | Slight Chance Rain then Mostly Cloudy | 10 to 15 mph N | 20% |
| Friday Night | 33°F | Partly Cloudy | 0 to 10 mph NNW | 3% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph WNW | 3% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph WSW | 4% |
| Sunday | 56°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 15% |
| Sunday Night | 34°F | Mostly Clear | 5 mph W | 5% |
| Monday | 60°F | Sunny | 5 to 15 mph WSW | 2% |
| Monday Night | 38°F | Mostly Clear | 5 to 10 mph W | 1% |
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 Nov 3, 2026.