Sun Valley Lake, IA Weather & Growing Conditions
This Afternoon
66°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. High near 66, with temperatures falling to around 58 in the afternoon. Northeast wind around 9 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Showers And Thunderstorms | 9 mph NE | 80% |
| Tonight | 45°F | Rain Showers Likely then Cloudy | 9 to 14 mph NW | 72% |
| Wednesday | 52°F | Mostly Cloudy | 13 to 16 mph W | 11% |
| Wednesday Night | 42°F | Mostly Cloudy | 12 mph W | 6% |
| Thursday | 53°F | Chance Rain Showers | 10 mph WNW | 33% |
| Thursday Night | 40°F | Mostly Cloudy | 8 mph NNW | 11% |
| Friday | 52°F | Partly Sunny | 3 to 8 mph N | 3% |
| Friday Night | 35°F | Partly Cloudy | 2 mph NW | 0% |
| Saturday | 56°F | Mostly Sunny | 5 mph WSW | 3% |
| Saturday Night | 37°F | Mostly Clear | 5 mph W | 5% |
| Sunday | 61°F | Sunny | 6 mph W | 4% |
| Sunday Night | 40°F | Mostly Clear | 7 mph SW | 0% |
| Monday | 65°F | Sunny | 7 to 12 mph SW | 0% |
| Monday Night | 42°F | Mostly Clear | 6 mph WNW | 0% |
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 Nov 4, 2026.