Tiffin, IA Weather & Growing Conditions
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
| 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). Updated through the day.
Growing snapshot for Tiffin, IA
Last spring frost
Apr 21
First fall frost
Oct 18
Growing season
180 days
Hardiness zone
5b
Explore more for Tiffin, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Iowa City Muni Ap, Ia (8.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.