Sun Valley Lake, IA Weather & Growing Conditions
Today
86°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 11am. Partly sunny. High near 86, with temperatures falling to around 84 in the afternoon. South wind 5 to 8 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Chance Showers And Thunderstorms | 5 to 8 mph S | 27% |
| Tonight | 64°F | Showers And Thunderstorms Likely | 10 mph NNE | 72% |
| Wednesday | 74°F | Showers And Thunderstorms Likely | 9 mph NE | 82% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 3 to 9 mph NE | 48% |
| Thursday | 81°F | Mostly Sunny | 3 mph ENE | 13% |
| Thursday Night | 62°F | Mostly Clear | 3 mph ESE | 5% |
| Friday | 85°F | Sunny | 6 mph S | 6% |
| Friday Night | 67°F | Mostly Clear | 6 mph S | 11% |
| Saturday | 89°F | Sunny | 5 to 10 mph SSW | 3% |
| Saturday Night | 72°F | Mostly Clear | 13 mph S | 8% |
| Sunday | 91°F | Mostly Sunny | 14 mph SSW | 8% |
| Sunday Night | 72°F | Partly Cloudy | 14 mph S | 14% |
| Monday | 91°F | Mostly Sunny | 12 to 15 mph SSW | 14% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 12 to 15 mph S | 23% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sun Valley Lake, IA
Last spring frost
Apr 23
First fall frost
Oct 17
Growing season
176 days
Hardiness zone
5b
Explore more for Sun Valley Lake, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Beaconsfield, Ia (4.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.