Tiffin, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Tiffin, a city in Johnson County, Iowa.
Today
85°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3pm. Partly sunny. High near 85, with temperatures falling to around 83 in the afternoon. West wind 5 to 10 mph. Chance of precipitation is 40%.
7-day forecast for Tiffin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph W | 38% |
| Tonight | 65°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 86% |
| Wednesday | 76°F | Showers And Thunderstorms | 5 mph N | 79% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 5 mph N | 49% |
| Thursday | 80°F | Chance Rain Showers then Mostly Sunny | 5 mph NE | 27% |
| Thursday Night | 60°F | Mostly Clear | 0 to 5 mph E | 3% |
| Friday | 83°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 65°F | Mostly Clear | 5 mph S | 11% |
| Saturday | 86°F | Mostly Sunny | 5 mph S | 10% |
| Saturday Night | 71°F | Mostly Clear | 10 mph S | 14% |
| Sunday | 87°F | Mostly Sunny | 10 mph S | 14% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 36% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 mph S | 36% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 mph SE | 32% |
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
5b
More local growing data for Tiffin: nearby ZIP 52340 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Coralville
Frytown
Hills
Iowa City
Kalona
Lone Tree
North Liberty
Oxford
Shueyville
Solon
Swisher
University Heights
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 Aug 4, 2026.