Armstrong, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Armstrong, a city in Emmet County, Iowa.
Overnight
62°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms before 4am, then patchy fog and a chance of showers and thunderstorms. Cloudy, with a low around 62. Northeast wind around 8 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Armstrong
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Patchy Fog | 8 mph NE | 42% |
| Saturday | 68°F | Patchy Fog | 7 to 13 mph N | 30% |
| Saturday Night | 56°F | Chance Rain Showers then Cloudy | 13 mph NNE | 25% |
| Sunday | 66°F | Mostly Cloudy then Slight Chance Rain Showers | 16 mph NE | 18% |
| Sunday Night | 52°F | Chance Rain Showers | 9 to 13 mph ENE | 39% |
| Monday | 61°F | Chance Rain Showers | 12 mph ENE | 52% |
| Monday Night | 46°F | Chance Rain Showers then Mostly Cloudy | 5 to 9 mph ENE | 49% |
| Tuesday | 63°F | Mostly Sunny | 5 to 8 mph E | 8% |
| Tuesday Night | 43°F | Mostly Clear | 3 to 7 mph ESE | 1% |
| Wednesday | 65°F | Sunny | 3 to 7 mph SE | 2% |
| Wednesday Night | 48°F | Partly Cloudy | 5 mph SE | 13% |
| Thursday | 67°F | Slight Chance Rain Showers | 3 to 7 mph SSE | 18% |
| Thursday Night | 52°F | Mostly Cloudy | 5 mph SE | 7% |
| Friday | 70°F | Mostly Sunny | 3 to 8 mph SE | 7% |
Forecast source: National Weather Service (api.weather.gov) for Armstrong (43.394, -94.483). Updated through the day.
Growing snapshot for Armstrong
Last spring frost
May 4
First fall frost
Oct 1
Growing season
150 days
Hardiness zone
5a
More local growing data for Armstrong: nearby ZIP 50514 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Swea City 5N, Ia (8.7 mi from Armstrong). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.