Harlan, IA Weather & Growing Conditions
Overnight
69°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy. Low around 69, with temperatures rising to around 71 overnight. Southwest wind around 6 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 69°F | Showers And Thunderstorms Likely | 6 mph SW | 72% |
| Saturday | 78°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 3 to 7 mph NW | 56% |
| Saturday Night | 59°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 6 to 9 mph N | 34% |
| Sunday | 64°F | Chance Rain Showers | 8 to 12 mph NNE | 36% |
| Sunday Night | 54°F | Chance Rain Showers | 7 to 10 mph NE | 38% |
| Monday | 59°F | Rain Showers Likely | 9 mph NE | 59% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 3 to 8 mph NE | 48% |
| Tuesday | 60°F | Partly Sunny | 3 to 7 mph ENE | 3% |
| Tuesday Night | 45°F | Partly Cloudy | 0 to 5 mph E | 1% |
| Wednesday | 64°F | Mostly Sunny | 1 to 5 mph ESE | 1% |
| Wednesday Night | 50°F | Partly Cloudy then Slight Chance Rain Showers | 0 to 3 mph SE | 16% |
| Thursday | 65°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% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Harlan, IA
Last spring frost
Apr 27
First fall frost
Oct 9
Growing season
165 days
Hardiness zone
5b
Explore more for Harlan, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Harlan, Ia (1.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.