Oswego, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a community in Kosciusko County, Indiana.
Today
75°F
Showers And Thunderstorms Likely then Showers And Thunderstorms
Showers and thunderstorms likely before 11am, then showers and thunderstorms between 11am and 2pm, then a chance of showers and thunderstorms. Cloudy, with a high near 75. Southeast wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph SE | 90% |
| Tonight | 65°F | Showers And Thunderstorms Likely | 0 to 5 mph S | 79% |
| Sunday | 73°F | Showers And Thunderstorms | 0 to 10 mph NW | 80% |
| Sunday Night | 53°F | Chance Showers And Thunderstorms | 10 mph NE | 48% |
| Monday | 66°F | Chance Rain Showers | 10 to 15 mph NE | 41% |
| Monday Night | 49°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 20% |
| Tuesday | 65°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph NE | 18% |
| Tuesday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 37% |
| Wednesday | 66°F | Chance Rain Showers | 10 mph NE | 37% |
| Wednesday Night | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 19% |
| Thursday | 68°F | Partly Sunny | 5 to 10 mph NE | 2% |
| Thursday Night | 51°F | Mostly Cloudy | 5 to 10 mph NE | 3% |
| Friday | 71°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Friday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 4% |
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.