Tiffin, IA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Tiffin, a city in Johnson County, Iowa.

Overnight

68°F

Chance Showers And Thunderstorms

A chance of showers and thunderstorms before 4am, then patchy fog and a chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Southeast wind around 5 mph. Chance of precipitation is 50%.

7-day forecast for Tiffin

When	Temp	Forecast	Wind	Precip
Overnight	68°F	Chance Showers And Thunderstorms	5 mph SE	51%
Saturday	81°F	Patchy Fog	5 to 10 mph S	71%
Saturday Night	63°F	Chance Showers And Thunderstorms then Showers And Thunderstorms	5 to 10 mph NW	79%
Sunday	68°F	Showers And Thunderstorms Likely	10 to 15 mph NE	65%
Sunday Night	57°F	Rain Showers Likely	10 to 15 mph NE	55%
Monday	63°F	Rain Showers Likely	15 mph NE	55%
Monday Night	52°F	Chance Rain Showers	10 to 15 mph NE	43%
Tuesday	61°F	Chance Rain Showers then Partly Sunny	10 mph NE	26%
Tuesday Night	47°F	Mostly Clear	5 to 10 mph NE	6%
Wednesday	65°F	Sunny	5 mph NE	0%
Wednesday Night	51°F	Partly Cloudy	5 mph NE	1%
Thursday	67°F	Mostly Sunny	5 mph NE	7%
Thursday Night	54°F	Partly Cloudy	0 to 5 mph E	5%
Friday	70°F	Mostly Sunny	5 mph E	6%

Forecast source: National Weather Service (api.weather.gov) for Tiffin (41.705, -91.654). Updated through the day.

Growing snapshot for Tiffin

Last spring frost

Apr 21

First fall frost

Oct 18

Growing season

180 days

Hardiness zone

More local growing data for Tiffin: nearby ZIP 52340 weather · frost dates · planting calendar · Iowa frost dates

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Climate data from the nearest NOAA station, Iowa City Muni Ap, Ia (8.5 mi from Tiffin). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.