Tiffin, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Tiffin, a city in Johnson County, Iowa.
Overnight
50°F
Mostly Cloudy
Mostly cloudy. Low around 50, with temperatures rising to around 52 overnight. Southwest wind around 10 mph.
7-day forecast for Tiffin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Mostly Cloudy | 10 mph SW | 14% |
| Wednesday | 52°F | Chance Rain Showers then Mostly Cloudy | 15 mph W | 29% |
| Wednesday Night | 45°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph W | 15% |
| Thursday | 54°F | Rain Showers Likely | 10 to 15 mph NW | 61% |
| Thursday Night | 41°F | Mostly Cloudy | 5 to 10 mph N | 11% |
| Friday | 49°F | Mostly Sunny | 5 to 10 mph N | 5% |
| Friday Night | 31°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 1% |
| Sunday | 57°F | Sunny | 5 mph W | 2% |
| Sunday Night | 36°F | Clear | 0 to 5 mph SW | 0% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.