California Junction, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for California Junction, a community in Harrison County, Iowa.
This Afternoon
77°F
Slight Chance Showers And Thunderstorms
A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly cloudy. High near 77, with temperatures falling to around 74 in the afternoon. North northwest wind around 8 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for California Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Slight Chance Showers And Thunderstorms | 8 mph NNW | 17% |
| Tonight | 61°F | Slight Chance Showers And Thunderstorms | 9 mph N | 16% |
| Sunday | 64°F | Chance Rain Showers | 9 mph NNE | 53% |
| Sunday Night | 57°F | Rain Showers Likely | 5 to 8 mph NE | 63% |
| Monday | 59°F | Rain Showers Likely | 6 to 9 mph NE | 73% |
| Monday Night | 52°F | Chance Rain Showers then Mostly Cloudy | 3 to 9 mph NNE | 25% |
| Tuesday | 62°F | Partly Sunny | 6 mph NE | 3% |
| Tuesday Night | 48°F | Partly Cloudy | 5 mph E | 0% |
| Wednesday | 64°F | Partly Sunny | 2 to 6 mph ESE | 5% |
| Wednesday Night | 53°F | Mostly Cloudy then Chance Showers And Thunderstorms | 6 mph SE | 25% |
| Thursday | 67°F | Chance Showers And Thunderstorms | 8 mph SSE | 37% |
| Thursday Night | 57°F | Slight Chance Rain Showers then Mostly Cloudy | 6 mph SE | 18% |
| Friday | 69°F | Slight Chance Rain Showers | 6 mph ESE | 22% |
| Friday Night | 58°F | Chance Rain Showers | 6 mph SE | 28% |
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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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 19, 2026.