Savanna, IL Weather & Growing Conditions
This Afternoon
66°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy, with a high near 66. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Showers And Thunderstorms | 15 mph S | 95% |
| Tonight | 51°F | Showers And Thunderstorms | 10 to 15 mph S | 87% |
| Wednesday | 56°F | Chance Rain Showers | 15 mph SW | 45% |
| Wednesday Night | 43°F | Chance Rain Showers | 10 to 15 mph SW | 26% |
| Thursday | 53°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 | 52°F | Mostly Sunny | 0 to 5 mph NW | 3% |
| Saturday Night | 32°F | Mostly Clear | 0 mph | 3% |
| Sunday | 58°F | Mostly Sunny | 0 to 10 mph W | 13% |
| Sunday Night | 33°F | Mostly Clear | 0 to 5 mph W | 3% |
| Monday | 61°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). Updated through the day.
Growing snapshot for Savanna, IL
Last spring frost
May 2
First fall frost
Oct 7
Growing season
154 days
Hardiness zone
5a
Explore more for Savanna, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mt Carroll, Il (7.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.