Primghar, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Primghar, a city in O'brien County, Iowa.
Today
45°F
Rain Showers Likely
Rain showers likely. Cloudy, with a high near 45. West northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Primghar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 45°F | Rain Showers Likely | 15 to 20 mph WNW | 55% |
| Tonight | 37°F | Chance Rain Showers | 15 mph NW | 54% |
| Thursday | 45°F | Mostly Cloudy | 10 to 15 mph NNW | 5% |
| Thursday Night | 30°F | Mostly Cloudy | 5 to 10 mph N | 0% |
| Friday | 44°F | Mostly Sunny | 0 to 5 mph NE | 0% |
| Friday Night | 27°F | Partly Cloudy | 0 to 5 mph SSE | 0% |
| Saturday | 50°F | Mostly Sunny | 5 to 10 mph SSW | 1% |
| Saturday Night | 33°F | Mostly Clear | 5 mph W | 0% |
| Sunday | 55°F | Sunny | 5 to 10 mph WSW | 0% |
| Sunday Night | 37°F | Mostly Clear | 5 to 10 mph SSW | 0% |
| Monday | 60°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 mph NW | 0% |
| Tuesday | 58°F | Mostly Sunny | 5 mph WNW | 0% |
| Tuesday Night | 40°F | Partly Cloudy | 5 mph SSE | 0% |
Forecast source: National Weather Service (api.weather.gov) for Primghar (43.086, -95.621). Updated through the day.
Growing snapshot for Primghar
Last spring frost
Apr 29
First fall frost
Oct 10
Growing season
163 days
Hardiness zone
5a
More local growing data for Primghar: nearby ZIP 51245 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Primghar, Ia (1.5 mi from Primghar). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.