Primghar, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Primghar, a city in O'brien County, Iowa.
Today
78°F
Mostly Sunny
Mostly sunny, with a high near 78. East northeast wind 0 to 5 mph.
7-day forecast for Primghar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Mostly Sunny | 0 to 5 mph ENE | 0% |
| Tonight | 54°F | Partly Cloudy | 5 mph SE | 0% |
| Thursday | 82°F | Mostly Sunny | 5 to 15 mph S | 0% |
| Thursday Night | 61°F | Partly Cloudy | 10 to 15 mph S | 6% |
| Friday | 84°F | Slight Chance Showers And Thunderstorms | 10 mph WSW | 16% |
| Friday Night | 57°F | Mostly Clear | 5 to 10 mph NE | 5% |
| Saturday | 83°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSE | 19% |
| Saturday Night | 63°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SE | 23% |
| Sunday | 85°F | Mostly Sunny | 5 to 10 mph E | 8% |
| Sunday Night | 65°F | Partly Cloudy then Chance Showers And Thunderstorms | 10 to 15 mph ESE | 37% |
| Monday | 83°F | Chance Showers And Thunderstorms then Partly Sunny | 10 mph ENE | 37% |
| Monday Night | 62°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph ENE | 20% |
| Tuesday | 79°F | Slight Chance Showers And Thunderstorms | 10 mph ENE | 20% |
| Tuesday Night | 61°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph ENE | 32% |
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 Aug 5, 2026.