Tiffin, IA Weather & Growing Conditions
This Afternoon
78°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 4pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 78. South wind 5 to 10 mph. Chance of precipitation is 50%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 52% |
| Tonight | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph N | 88% |
| Sunday | 66°F | Rain Showers Likely | 10 to 15 mph NE | 58% |
| Sunday Night | 57°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 55% |
| Monday | 61°F | Rain Showers Likely | 15 mph NE | 70% |
| Monday Night | 52°F | Rain Showers Likely | 10 mph NE | 64% |
| Tuesday | 60°F | Chance Rain Showers | 10 mph NE | 44% |
| Tuesday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 7% |
| Wednesday | 63°F | Mostly Sunny | 5 mph NE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 66°F | Partly Sunny | 0 to 5 mph E | 9% |
| Thursday Night | 56°F | Slight Chance Rain Showers | 0 to 5 mph E | 20% |
| Friday | 69°F | Slight Chance Rain Showers | 0 to 5 mph E | 18% |
| Friday Night | 57°F | Partly Cloudy | 5 mph E | 12% |
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 Sep 19, 2026.