Freeport, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Freeport, a city in Stephenson County, Illinois.
Tonight
61°F
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before midnight, then a chance of showers and thunderstorms between midnight and 1am, then a chance of showers and thunderstorms between 1am and 3am, then showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy. Low around 61, with temperatures rising to around 64 overnight. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
7-day forecast for Freeport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph E | 76% |
| Saturday | 77°F | Showers And Thunderstorms | 5 to 10 mph SE | 89% |
| Saturday Night | 61°F | Showers And Thunderstorms Likely | 5 to 10 mph NE | 74% |
| Sunday | 68°F | Rain Showers Likely | 10 to 15 mph NE | 64% |
| Sunday Night | 53°F | Chance Rain Showers | 15 mph NE | 47% |
| Monday | 64°F | Chance Rain Showers | 15 mph NE | 43% |
| Monday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 43% |
| Tuesday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 27% |
| Tuesday Night | 47°F | Mostly Cloudy | 5 to 15 mph NE | 8% |
| Wednesday | 66°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Wednesday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Thursday | 67°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Freeport (42.289, -89.634). Updated through the day.
Growing snapshot for Freeport
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
169 days
Hardiness zone
5a
More local growing data for Freeport: nearby ZIP 61032 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Freeport Waste Wtp, Il (2.3 mi from Freeport). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.