Charter Oak, IA Weather & Growing Conditions
Overnight
66°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms. Cloudy. Low around 66, with temperatures rising to around 69 overnight. East wind around 6 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Patchy Fog | 6 mph E | 49% |
| Saturday | 74°F | Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 8 mph NNW | 48% |
| Saturday Night | 58°F | Cloudy | 8 mph NNE | 14% |
| Sunday | 63°F | Slight Chance Drizzle then Chance Rain Showers | 8 to 12 mph NE | 29% |
| Sunday Night | 54°F | Chance Rain Showers | 6 to 9 mph ENE | 45% |
| Monday | 59°F | Rain Showers Likely | 9 mph ENE | 60% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 3 to 7 mph ENE | 46% |
| Tuesday | 61°F | Mostly Sunny | 6 mph E | 8% |
| Tuesday Night | 45°F | Partly Cloudy | 1 to 5 mph ESE | 1% |
| Wednesday | 64°F | Mostly Sunny | 5 mph SE | 2% |
| Wednesday Night | 50°F | Partly Cloudy then Chance Rain Showers | 3 mph SE | 27% |
| Thursday | 66°F | Chance Rain Showers | 2 to 6 mph SE | 27% |
| Thursday Night | 54°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph SE | 15% |
| Friday | 68°F | Slight Chance Rain Showers | 2 to 6 mph SE | 15% |
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 Sep 19, 2026.