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South Haven, IN Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for South Haven, a community in Porter County, Indiana.

This Afternoon
72°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy, with a high near 72. West northwest wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for South Haven

WhenTempForecastWindPrecip
This Afternoon 72°F Chance Showers And Thunderstorms 5 mph WNW 27%
Tonight 66°F Showers And Thunderstorms 0 to 5 mph ESE 90%
Sunday 70°F Showers And Thunderstorms 5 to 15 mph NNE 81%
Sunday Night 53°F Chance Rain Showers 10 mph NE 49%
Monday 65°F Chance Rain Showers 10 to 15 mph ENE 33%
Monday Night 51°F Chance Rain Showers 10 mph ENE 33%
Tuesday 63°F Chance Rain Showers 10 mph NE 26%
Tuesday Night 52°F Chance Rain Showers then Mostly Cloudy 5 to 10 mph NE 26%
Wednesday 64°F Mostly Cloudy 5 to 10 mph NE 14%
Wednesday Night 52°F Mostly Cloudy 5 to 10 mph NE 10%
Thursday 67°F Partly Sunny 5 mph NE 2%
Thursday Night 53°F Mostly Cloudy 0 to 5 mph NE 8%
Friday 71°F Partly Sunny 0 to 5 mph NE 8%
Friday Night 53°F Partly Cloudy 0 to 5 mph NE 1%

Forecast source: National Weather Service (api.weather.gov) for South Haven (41.539, -87.140). Updated through the day.

Growing snapshot for South Haven

Last spring frost
Apr 22
First fall frost
Oct 25
Growing season
185 days
Hardiness zone
6a

More local growing data for South Haven: nearby ZIP 46393 weather · frost dates · planting calendar · Indiana frost dates

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Climate data from the nearest NOAA station, Valparaiso Wtr Wks, In (6.7 mi from South Haven). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.