South Haven, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Haven, a community in Porter County, Indiana.
Today
83°F
Sunny
Sunny, with a high near 83. South southwest wind 5 to 10 mph.
7-day forecast for South Haven
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 64°F | Partly Cloudy | 5 mph SSW | 1% |
| Wednesday | 81°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph SW | 35% |
| Wednesday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph SW | 87% |
| Thursday | 78°F | Showers And Thunderstorms | 0 to 5 mph WSW | 87% |
| Thursday Night | 62°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 5 mph ESE | 55% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SW | 8% |
| Friday Night | 63°F | Mostly Clear | 0 mph | 8% |
| Saturday | 83°F | Mostly Sunny | 5 mph SSW | 10% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 17% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 10 mph SW | 17% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 39% |
| Monday | 85°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 39% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph WSW | 47% |
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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Valparaiso
Wheeler
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 Aug 4, 2026.