Diagonal, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Diagonal, a city in Ringgold County, Iowa.
Overnight
66°F
Partly Cloudy
Partly cloudy, with a low around 66. South wind around 5 mph.
7-day forecast for Diagonal
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Partly Cloudy | 5 mph S | 3% |
| Tuesday | 87°F | Partly Sunny then Chance Showers And Thunderstorms | 6 mph SSE | 28% |
| Tuesday Night | 64°F | Showers And Thunderstorms Likely | 10 mph NNE | 66% |
| Wednesday | 74°F | Showers And Thunderstorms Likely | 9 mph NE | 81% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 3 to 9 mph NE | 44% |
| Thursday | 82°F | Mostly Sunny | 3 mph E | 11% |
| Thursday Night | 63°F | Mostly Clear | 3 mph ESE | 7% |
| Friday | 86°F | Mostly Sunny | 3 to 7 mph S | 7% |
| Friday Night | 67°F | Mostly Clear | 6 mph S | 8% |
| Saturday | 90°F | Sunny | 3 to 10 mph S | 3% |
| Saturday Night | 72°F | Mostly Clear | 13 mph S | 8% |
| Sunday | 92°F | Mostly Sunny | 10 to 14 mph SSW | 7% |
| Sunday Night | 72°F | Partly Cloudy | 10 to 14 mph S | 12% |
| Monday | 92°F | Mostly Sunny | 12 to 16 mph SSW | 12% |
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 Aug 4, 2026.