California Junction, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for California Junction, a community in Harrison County, Iowa.
Today
78°F
Patchy Smoke then Showers And Thunderstorms Likely
Patchy smoke and a slight chance of showers and thunderstorms before 11am, then showers and thunderstorms likely between 11am and 4pm, then patchy smoke and a chance of showers and thunderstorms. Partly sunny. High near 78, with temperatures falling to around 76 in the afternoon. North wind 8 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for California Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Patchy Smoke then Showers And Thunderstorms Likely | 8 to 13 mph N | 60% |
| Tonight | 61°F | Patchy Smoke | 3 to 13 mph NNE | 65% |
| Wednesday | 74°F | Patchy Smoke | 6 mph ENE | 49% |
| Wednesday Night | 56°F | Partly Cloudy | 1 to 6 mph ESE | 2% |
| Thursday | 82°F | Mostly Sunny | 1 to 6 mph ESE | 0% |
| Thursday Night | 63°F | Mostly Clear | 6 mph SSE | 4% |
| Friday | 87°F | Sunny | 5 to 9 mph S | 4% |
| Friday Night | 69°F | Mostly Clear | 5 to 8 mph SSE | 4% |
| Saturday | 92°F | Sunny | 3 to 15 mph S | 3% |
| Saturday Night | 73°F | Mostly Clear | 9 to 15 mph S | 8% |
| Sunday | 93°F | Mostly Sunny | 7 to 13 mph SSE | 5% |
| Sunday Night | 73°F | Slight Chance Showers And Thunderstorms | 13 mph SSE | 19% |
| Monday | 93°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 9 to 15 mph S | 18% |
| Monday Night | 73°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 9 to 14 mph SE | 21% |
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 Aug 4, 2026.