Harlan, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harlan, a city in Shelby County, Iowa.
Today
78°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 78, with temperatures falling to around 75 in the afternoon. Northwest wind 3 to 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Harlan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Chance Showers And Thunderstorms | 3 to 7 mph NW | 30% |
| Tonight | 59°F | Chance Showers And Thunderstorms | 8 mph N | 34% |
| Sunday | 63°F | Chance Rain Showers | 8 to 12 mph NNE | 36% |
| Sunday Night | 54°F | Chance Rain Showers | 6 to 10 mph NE | 38% |
| Monday | 59°F | Rain Showers Likely | 9 mph NE | 59% |
| Monday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 3 to 9 mph NE | 48% |
| Tuesday | 59°F | Partly Sunny | 3 to 7 mph ENE | 3% |
| Tuesday Night | 45°F | Partly Cloudy | 0 to 5 mph E | 1% |
| Wednesday | 63°F | Mostly Sunny | 1 to 5 mph ESE | 1% |
| Wednesday Night | 50°F | Partly Cloudy then Slight Chance Rain Showers | 3 mph SE | 17% |
| Thursday | 64°F | Chance Rain Showers | 1 to 6 mph SE | 26% |
| Thursday Night | 54°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph SE | 20% |
| Friday | 66°F | Slight Chance Rain Showers | 1 to 7 mph SE | 20% |
| Friday Night | 55°F | Slight Chance Rain Showers | 5 mph SE | 18% |
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 19, 2026.