Armstrong, IA Weather & Growing Conditions
This Afternoon
56°F
Chance Rain Showers
A chance of rain showers. Cloudy. High near 56, with temperatures falling to around 53 in the afternoon. North northwest wind around 16 mph, with gusts as high as 25 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 |
|---|---|---|---|---|
| This Afternoon | 56°F | Chance Rain Showers | 16 mph NNW | 30% |
| Tonight | 41°F | Rain Showers | 16 mph NW | 93% |
| Wednesday | 47°F | Rain Showers | 17 mph WNW | 89% |
| Wednesday Night | 38°F | Rain Showers | 16 mph NW | 90% |
| Thursday | 47°F | Chance Rain Showers | 14 to 17 mph NNW | 53% |
| Thursday Night | 33°F | Mostly Cloudy | 6 to 13 mph N | 4% |
| Friday | 46°F | Partly Sunny | 6 mph NNE | 0% |
| Friday Night | 29°F | Partly Cloudy | 3 mph SSE | 0% |
| Saturday | 53°F | Mostly Sunny | 3 to 8 mph SW | 2% |
| Saturday Night | 34°F | Mostly Clear | 7 mph W | 3% |
| Sunday | 57°F | Sunny | 8 mph W | 6% |
| Sunday Night | 36°F | Mostly Clear | 9 mph SSW | 1% |
| Monday | 61°F | Sunny | 9 to 13 mph WSW | 0% |
| Monday Night | 37°F | Mostly Clear | 8 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Armstrong, IA
Last spring frost
May 4
First fall frost
Oct 1
Growing season
150 days
Hardiness zone
5a
Explore more for Armstrong, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Swea City 5N, Ia (8.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.