Oswego, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a village in Kendall County, Illinois.
This Afternoon
70°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy. High near 70, with temperatures falling to around 66 in the afternoon. South southeast wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Chance Rain Showers | 15 mph SSE | 54% |
| Tonight | 59°F | Rain Showers | 15 mph SSE | 87% |
| Wednesday | 62°F | Chance Rain Showers | 15 mph SSW | 51% |
| Wednesday Night | 47°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph SW | 16% |
| Thursday | 57°F | Chance Rain Showers | 10 to 15 mph WSW | 30% |
| Thursday Night | 42°F | Chance Rain Showers | 5 to 10 mph WNW | 36% |
| Friday | 53°F | Slight Chance Rain Showers | 10 to 15 mph N | 23% |
| Friday Night | 35°F | Partly Cloudy | 5 to 10 mph NNW | 4% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 5% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph WSW | 3% |
| Sunday | 57°F | Mostly Sunny | 5 to 10 mph W | 14% |
| Sunday Night | 34°F | Mostly Clear | 5 to 10 mph WNW | 6% |
| Monday | 61°F | Sunny | 5 to 10 mph WSW | 3% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph W | 1% |
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 Nov 4, 2026.