Diagonal, IA Weather & Growing Conditions
Overnight
69°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. Low around 69, with temperatures rising to around 71 overnight. Southwest wind around 3 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 69°F | Chance Showers And Thunderstorms | 3 mph SW | 31% |
| Saturday | 82°F | Chance Showers And Thunderstorms | 3 to 10 mph WSW | 41% |
| Saturday Night | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 7 mph N | 58% |
| Sunday | 67°F | Chance Rain Showers then Chance Showers And Thunderstorms | 8 to 12 mph NNE | 47% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 12 mph NE | 56% |
| Monday | 60°F | Showers And Thunderstorms Likely | 12 mph NE | 56% |
| Monday Night | 52°F | Chance Rain Showers | 7 to 10 mph NE | 46% |
| Tuesday | 59°F | Partly Sunny | 9 mph NE | 8% |
| Tuesday Night | 46°F | Partly Cloudy | 3 to 7 mph ENE | 5% |
| Wednesday | 63°F | Mostly Sunny | 5 mph ENE | 2% |
| Wednesday Night | 50°F | Partly Cloudy | 3 mph E | 7% |
| Thursday | 65°F | Slight Chance Rain Showers | 5 mph ESE | 24% |
| Thursday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph ESE | 22% |
| Friday | 66°F | Slight Chance Rain Showers | 6 mph ESE | 22% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Diagonal, IA
Last spring frost
Apr 25
First fall frost
Oct 12
Growing season
169 days
Hardiness zone
5b
Explore more for Diagonal, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Mt Ayr, Ia (9.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.