Harman US

Savanna, IL Weather & Growing Conditions

Today
78°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms between 1pm and 3pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 78. South wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Today 78°F Showers And Thunderstorms Likely 5 to 10 mph S 68%
Tonight 61°F Showers And Thunderstorms 5 to 10 mph NE 90%
Sunday 68°F Chance Rain Showers 10 to 15 mph NE 54%
Sunday Night 54°F Chance Rain Showers 10 to 15 mph NE 34%
Monday 64°F Chance Rain Showers 15 mph NE 46%
Monday Night 49°F Chance Rain Showers 10 to 15 mph NE 29%
Tuesday 63°F Slight Chance Rain Showers then Partly Sunny 10 mph NE 20%
Tuesday Night 47°F Partly Cloudy 5 to 10 mph NE 6%
Wednesday 66°F Mostly Sunny 5 to 10 mph NE 1%
Wednesday Night 49°F Partly Cloudy 0 to 5 mph NE 1%
Thursday 67°F Mostly Sunny 5 mph NE 5%
Thursday Night 50°F Partly Cloudy 0 to 5 mph NE 5%
Friday 70°F Mostly Sunny 0 to 5 mph NE 5%
Friday Night 51°F Partly Cloudy 0 to 5 mph E 4%

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 Sep 19, 2026.