Savanna, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Savanna, a city in Carroll County, Illinois.
This Afternoon
67°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. High near 67, with temperatures falling to around 65 in the afternoon. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 100%.
7-day forecast for Savanna
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Showers And Thunderstorms | 15 mph S | 96% |
| Tonight | 52°F | Showers And Thunderstorms | 10 to 15 mph S | 86% |
| Wednesday | 56°F | Chance Rain Showers | 15 mph SW | 43% |
| Wednesday Night | 43°F | Chance Rain Showers | 10 to 15 mph SW | 25% |
| Thursday | 54°F | Chance Rain Showers | 5 to 10 mph W | 50% |
| Thursday Night | 39°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 25% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 12% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph W | 3% |
| Saturday Night | 33°F | Mostly Clear | 0 mph | 3% |
| Sunday | 59°F | Mostly Sunny | 0 to 10 mph W | 13% |
| Sunday Night | 33°F | Mostly Clear | 0 to 5 mph W | 3% |
| Monday | 62°F | Sunny | 0 to 10 mph SW | 1% |
| Monday Night | 37°F | Mostly Clear | 0 to 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Savanna (42.094, -90.139). Updated through the day.
Growing snapshot for Savanna
Last spring frost
May 2
First fall frost
Oct 7
Growing season
154 days
Hardiness zone
5a
More local growing data for Savanna: nearby ZIP 61074 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mt Carroll, Il (7.3 mi from Savanna). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.