Arthur, IA Weather & Growing Conditions
Tonight
66°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Southwest wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 66°F | Chance Showers And Thunderstorms | 5 mph SW | 46% |
| Saturday | 74°F | Patchy Fog then Mostly Cloudy | 5 mph NNW | 35% |
| Saturday Night | 58°F | Slight Chance Rain Showers | 5 to 10 mph NNE | 17% |
| Sunday | 65°F | Chance Rain Showers | 10 mph NE | 27% |
| Sunday Night | 54°F | Chance Rain Showers | 5 to 10 mph ENE | 54% |
| Monday | 59°F | Showers And Thunderstorms Likely | 10 mph ENE | 64% |
| Monday Night | 49°F | Chance Showers And Thunderstorms | 5 mph ENE | 52% |
| Tuesday | 61°F | Mostly Cloudy | 5 mph E | 8% |
| Tuesday Night | 46°F | Mostly Cloudy | 0 to 5 mph ESE | 1% |
| Wednesday | 65°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Wednesday Night | 51°F | Mostly Cloudy then Slight Chance Rain Showers | 0 mph | 20% |
| Thursday | 66°F | Chance Rain Showers | 0 to 5 mph SSE | 26% |
| Thursday Night | 53°F | Mostly Cloudy then Slight Chance Rain Showers | 0 mph | 16% |
| Friday | 68°F | Slight Chance Rain Showers then Partly Sunny | 0 to 5 mph SE | 16% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Arthur, IA
Last spring frost
Apr 27
First fall frost
Oct 12
Growing season
167 days
Hardiness zone
5a
Explore more for Arthur, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Ida Grove 5Nw, Ia (9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.