Diagonal, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Diagonal, a city in Ringgold County, Iowa.
This Afternoon
49°F
Cloudy
Cloudy, with a high near 49. West wind 12 to 15 mph, with gusts as high as 22 mph.
7-day forecast for Diagonal
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 49°F | Cloudy | 12 to 15 mph W | 10% |
| Tonight | 40°F | Mostly Cloudy then Slight Chance Rain Showers | 10 mph WNW | 21% |
| Thursday | 53°F | Slight Chance Rain Showers then Cloudy | 12 mph NW | 23% |
| Thursday Night | 38°F | Mostly Cloudy | 8 mph N | 4% |
| Friday | 50°F | Partly Sunny | 3 to 7 mph N | 4% |
| Friday Night | 29°F | Partly Cloudy | 2 mph NNE | 0% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Saturday Night | 34°F | Mostly Clear | 3 mph WSW | 0% |
| Sunday | 61°F | Sunny | 5 mph W | 0% |
| Sunday Night | 37°F | Clear | 5 mph SW | 0% |
| Monday | 66°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 41°F | Clear | 5 mph W | 0% |
| Tuesday | 64°F | Sunny | 5 mph N | 1% |
| Tuesday Night | 42°F | Partly Cloudy | 2 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Diagonal (40.811, -94.342). Updated through the day.
Growing snapshot for Diagonal
Last spring frost
Apr 25
First fall frost
Oct 12
Growing season
169 days
Hardiness zone
5b
More local growing data for Diagonal: nearby ZIP 50845 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mt Ayr, Ia (9.5 mi from Diagonal). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.