California Junction, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for California Junction, a community in Harrison County, Iowa.
Overnight
61°F
Mostly Cloudy
Mostly cloudy. Low around 61, with temperatures rising to around 63 overnight. North wind around 8 mph.
7-day forecast for California Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Mostly Cloudy | 8 mph N | 7% |
| Sunday | 64°F | Chance Rain Showers | 9 mph NNE | 42% |
| Sunday Night | 56°F | Rain Showers Likely | 7 mph NE | 72% |
| Monday | 60°F | Rain Showers Likely | 8 mph NE | 65% |
| Monday Night | 52°F | Chance Rain Showers | 5 to 8 mph NE | 51% |
| Tuesday | 62°F | Slight Chance Rain Showers then Partly Sunny | 6 mph ENE | 15% |
| Tuesday Night | 47°F | Partly Cloudy | 5 mph E | 0% |
| Wednesday | 64°F | Mostly Sunny | 6 mph SE | 1% |
| Wednesday Night | 51°F | Mostly Cloudy then Chance Rain Showers | 5 mph SE | 26% |
| Thursday | 66°F | Chance Rain Showers | 5 to 8 mph SSE | 44% |
| Thursday Night | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 19% |
| Friday | 68°F | Slight Chance Rain Showers | 6 mph ESE | 19% |
| Friday Night | 58°F | Chance Rain Showers | 5 mph ESE | 29% |
| Saturday | 70°F | Chance Rain Showers | 6 to 9 mph SE | 30% |
Forecast source: National Weather Service (api.weather.gov) for California Junction (41.560, -95.995). Updated through the day.
Growing snapshot for California Junction
Last spring frost
Apr 29
First fall frost
Oct 8
Growing season
162 days
Hardiness zone
5b
More local growing data for California Junction: nearby ZIP 51555 weather · frost dates · planting calendar · Iowa frost dates
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River Sioux
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Climate data from the nearest NOAA station, Logan, Ia (8.5 mi from California Junction). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.