Harlan, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harlan, a city in Shelby County, Iowa.
Overnight
59°F
Cloudy
Cloudy. Low around 59, with temperatures rising to around 61 overnight. North northeast wind around 7 mph.
7-day forecast for Harlan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Cloudy | 7 mph NNE | 13% |
| Sunday | 63°F | Chance Rain Showers | 7 to 12 mph NE | 35% |
| Sunday Night | 54°F | Rain Showers Likely | 6 to 9 mph ENE | 66% |
| Monday | 58°F | Rain Showers Likely then Slight Chance Showers And Thunderstorms | 9 mph NE | 66% |
| Monday Night | 49°F | Rain Showers Likely | 3 to 9 mph NE | 56% |
| Tuesday | 60°F | Slight Chance Rain Showers then Partly Sunny | 3 to 7 mph ENE | 15% |
| Tuesday Night | 44°F | Partly Cloudy | 1 to 5 mph E | 1% |
| Wednesday | 62°F | Mostly Sunny | 2 to 6 mph ESE | 0% |
| Wednesday Night | 48°F | Mostly Cloudy | 3 mph SE | 14% |
| Thursday | 64°F | Chance Rain Showers | 2 to 7 mph SSE | 43% |
| Thursday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 3 mph SE | 15% |
| Friday | 66°F | Slight Chance Rain Showers | 1 to 5 mph ESE | 18% |
| Friday Night | 55°F | Mostly Cloudy then Chance Rain Showers | 3 mph ESE | 25% |
| Saturday | 68°F | Chance Rain Showers | 3 to 8 mph SE | 32% |
Forecast source: National Weather Service (api.weather.gov) for Harlan (41.650, -95.327). Updated through the day.
Growing snapshot for Harlan
Last spring frost
Apr 27
First fall frost
Oct 9
Growing season
165 days
Hardiness zone
5b
More local growing data for Harlan: nearby ZIP 51537 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Harlan, Ia (1.9 mi from Harlan). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.