Primghar, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Primghar, a city in O'brien County, Iowa.
This Afternoon
65°F
Patchy Fog
Patchy fog before 5pm. Cloudy, with a high near 65. North northeast wind around 10 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Primghar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 65°F | Patchy Fog | 10 mph NNE | 4% |
| Tonight | 55°F | Patchy Fog | 10 to 15 mph NNE | 4% |
| Sunday | 65°F | Patchy Fog then Cloudy | 15 mph NE | 14% |
| Sunday Night | 51°F | Rain Showers | 10 to 15 mph ENE | 80% |
| Monday | 57°F | Rain Showers | 10 mph ENE | 80% |
| Monday Night | 45°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 34% |
| Tuesday | 61°F | Partly Sunny | 5 to 10 mph E | 5% |
| Tuesday Night | 43°F | Partly Cloudy | 5 mph ESE | 1% |
| Wednesday | 65°F | Mostly Sunny | 5 to 10 mph SE | 4% |
| Wednesday Night | 50°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph SE | 35% |
| Thursday | 67°F | Chance Showers And Thunderstorms | 10 mph SSE | 43% |
| Thursday Night | 54°F | Slight Chance Rain Showers | 5 mph SE | 17% |
| Friday | 71°F | Slight Chance Rain Showers | 5 to 10 mph SE | 15% |
| Friday Night | 56°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph SE | 27% |
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 Sep 20, 2026.