Charter Oak, IA Weather & Growing Conditions
Tonight
38°F
Rain Showers
Rain showers. Cloudy. Low around 38, with temperatures rising to around 42 overnight. Northwest wind 12 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 38°F | Rain Showers | 12 to 18 mph NW | 86% |
| Wednesday | 47°F | Chance Rain Showers | 12 to 15 mph WNW | 43% |
| Wednesday Night | 37°F | Cloudy then Chance Rain Showers | 8 to 12 mph WNW | 53% |
| Thursday | 50°F | Chance Rain Showers | 10 mph NNW | 46% |
| Thursday Night | 34°F | Mostly Cloudy | 2 to 7 mph N | 3% |
| Friday | 50°F | Partly Sunny | 2 mph N | 0% |
| Friday Night | 31°F | Partly Cloudy | 1 mph SE | 0% |
| Saturday | 56°F | Mostly Sunny | 1 to 6 mph SW | 2% |
| Saturday Night | 34°F | Mostly Clear | 3 mph W | 4% |
| Sunday | 61°F | Sunny | 2 to 6 mph WSW | 4% |
| Sunday Night | 37°F | Mostly Clear | 6 mph SSW | 0% |
| Monday | 63°F | Sunny | 6 to 9 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 mph NW | 0% |
| Tuesday | 61°F | Mostly Sunny | 2 to 6 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Charter Oak, IA
Last spring frost
May 3
First fall frost
Oct 1
Growing season
151 days
Hardiness zone
5a
Explore more for Charter Oak, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Mapleton No.2, Ia (11.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.