Sun Valley Lake, IA Weather & Growing Conditions
Overnight
70°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy. Low around 70, with temperatures rising to around 72 overnight. Southwest wind around 7 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Slight Chance Showers And Thunderstorms | 7 mph SW | 18% |
| Saturday | 82°F | Chance Showers And Thunderstorms | 9 mph SW | 39% |
| Saturday Night | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 8 mph N | 62% |
| Sunday | 66°F | Chance Rain Showers then Chance Showers And Thunderstorms | 10 mph NNE | 43% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 mph NE | 61% |
| Monday | 59°F | Rain Showers Likely | 12 mph NE | 61% |
| Monday Night | 52°F | Chance Rain Showers | 9 mph NE | 48% |
| Tuesday | 58°F | Partly Sunny | 8 mph NE | 10% |
| Tuesday Night | 46°F | Partly Cloudy | 3 to 7 mph NE | 6% |
| Wednesday | 62°F | Mostly Sunny | 5 mph ENE | 2% |
| Wednesday Night | 51°F | Partly Cloudy | 3 mph E | 7% |
| Thursday | 64°F | Slight Chance Rain Showers | 3 mph ESE | 22% |
| Thursday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph ESE | 21% |
| Friday | 66°F | Slight Chance Rain Showers then Partly Sunny | 6 mph ESE | 21% |
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 Sep 19, 2026.