Oswego, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a village in Kendall County, Illinois.
Tonight
63°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 63. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 63°F | Mostly Cloudy then Chance Showers And Thunderstorms | 10 mph ESE | 42% |
| Saturday | 78°F | Showers And Thunderstorms Likely | 5 to 10 mph SE | 79% |
| Saturday Night | 65°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NE | 81% |
| Sunday | 69°F | Showers And Thunderstorms | 10 to 15 mph NNE | 81% |
| Sunday Night | 56°F | Rain Showers Likely | 15 mph NE | 66% |
| Monday | 65°F | Chance Rain Showers | 15 mph ENE | 52% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
| Tuesday | 64°F | Chance Rain Showers | 15 mph NE | 25% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 15 mph NE | 13% |
| Wednesday | 67°F | Partly Sunny | 10 mph NNE | 6% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NNE | 4% |
| Thursday | 69°F | Partly Sunny | 5 to 10 mph NNE | 3% |
| Thursday Night | 53°F | Partly Cloudy | 5 mph NNE | 3% |
| Friday | 71°F | Mostly Sunny | 5 to 10 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Oswego (41.683, -88.339). Updated through the day.
Growing snapshot for Oswego
Last spring frost
Apr 19
First fall frost
Oct 23
Growing season
185 days
Hardiness zone
5b
More local growing data for Oswego: nearby ZIP 60543 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Aurora, Il (7.8 mi from Oswego). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.