Promise City, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Promise City, a city in Wayne County, Iowa.
Overnight
46°F
Slight Chance Rain Showers
A slight chance of rain showers. Cloudy. Low around 46, with temperatures rising to around 48 overnight. West wind around 13 mph, with gusts as high as 18 mph. Chance of precipitation is 20%.
7-day forecast for Promise City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Slight Chance Rain Showers | 13 mph W | 16% |
| Wednesday | 52°F | Slight Chance Rain Showers then Cloudy | 12 to 17 mph W | 19% |
| Wednesday Night | 44°F | Mostly Cloudy | 10 mph W | 12% |
| Thursday | 54°F | Slight Chance Rain Showers | 8 to 12 mph WNW | 21% |
| Thursday Night | 41°F | Slight Chance Rain Showers then Mostly Cloudy | 7 mph NNW | 17% |
| Friday | 50°F | Partly Sunny | 3 to 8 mph N | 6% |
| Friday Night | 31°F | Partly Cloudy | 2 mph NNE | 0% |
| Saturday | 53°F | Mostly Sunny | 0 to 3 mph WSW | 1% |
| Saturday Night | 35°F | Mostly Clear | 3 mph WSW | 1% |
| Sunday | 60°F | Sunny | 5 mph W | 1% |
| Sunday Night | 37°F | Clear | 3 mph SW | 0% |
| Monday | 65°F | Sunny | 3 to 9 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 65°F | Sunny | 3 mph NNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Promise City (40.748, -93.148). Updated through the day.
Growing snapshot for Promise City
Last spring frost
Apr 18
First fall frost
Oct 23
Growing season
187 days
Hardiness zone
5b
More local growing data for Promise City: nearby ZIP 52583 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Rathbun Dam, Ia (13.3 mi from Promise City). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.