Oswego, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a village in Kendall County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 67°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SSW | 31% |
| Wednesday | 80°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph SW | 69% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 5 mph NW | 88% |
| Thursday | 79°F | Rain Showers Likely then Chance Showers And Thunderstorms | 5 mph ESE | 66% |
| Thursday Night | 62°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 29% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SE | 6% |
| Friday Night | 64°F | Mostly Clear | 0 to 5 mph S | 9% |
| Saturday | 84°F | Mostly Sunny | 5 to 10 mph SSW | 11% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 18% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 18% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 15 mph SSW | 36% |
| Monday | 85°F | Chance Rain Showers | 5 to 10 mph SSW | 36% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 10 mph W | 43% |
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 Aug 4, 2026.