Oswego, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a community in Kosciusko County, Indiana.
Tonight
57°F
Mostly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5am. Mostly cloudy. Low around 57, with temperatures rising to around 62 overnight. East wind 5 to 10 mph. Chance of precipitation is 20%.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph E | 18% |
| Saturday | 77°F | Showers And Thunderstorms | 5 to 10 mph SE | 79% |
| Saturday Night | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph S | 80% |
| Sunday | 74°F | Showers And Thunderstorms | 5 to 10 mph NW | 77% |
| Sunday Night | 53°F | Rain Showers Likely | 10 mph NE | 56% |
| Monday | 66°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 52% |
| Monday Night | 50°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Tuesday | 66°F | Slight Chance Rain Showers | 10 to 15 mph NE | 21% |
| Tuesday Night | 51°F | Slight Chance Rain Showers | 5 to 10 mph NE | 21% |
| Wednesday | 66°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph NE | 16% |
| Wednesday Night | 51°F | Mostly Cloudy | 5 to 10 mph NE | 12% |
| Thursday | 69°F | Partly Sunny | 5 to 10 mph N | 6% |
| Thursday Night | 51°F | Mostly Cloudy | 0 to 10 mph NE | 6% |
| Friday | 71°F | Mostly Sunny | 0 to 5 mph N | 5% |
Forecast source: National Weather Service (api.weather.gov) for Oswego (41.322, -85.787). Updated through the day.
Growing snapshot for Oswego
Last spring frost
Apr 28
First fall frost
Oct 18
Growing season
170 days
Hardiness zone
6a
More local growing data for Oswego: nearby ZIP 46538 weather · frost dates · planting calendar · Indiana frost dates
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Climate data from the nearest NOAA station, Warsaw, In (5.2 mi from Oswego). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.