Storm Lake, Iowa Weather
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Climate of Storm Lake: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Storm Lake, with average daytime highs around 30°C. January is the coolest, when nights typically fall to about -12°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 42°C, so the seasons feel very different from each other.
The area receives about 800 mm of rain in a typical year. Most of it falls from May to June and August, and June is the wettest month at roughly 121 mm.
For outdoor plans and travel, July and September usually offer the most comfortable weather in Storm Lake, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | -2° | -12° | 19 mm | 84% |
| Feb | 0° | -11° | 25 mm | 81% |
| Mar | 8° | -4° | 43 mm | 75% |
| Apr | 16° | 3° | 82 mm | 69% |
| May | 22° | 9° | 109 mm | 70% |
| Jun | 27° | 16° | 121 mm | 71% |
| Jul | 30° | 18° | 87 mm | 68% |
| Aug | 29° | 17° | 106 mm | 67% |
| Sep | 24° | 12° | 81 mm | 67% |
| Oct | 16° | 4° | 61 mm | 70% |
| Nov | 8° | -2° | 35 mm | 75% |
| Dec | 0° | -8° | 32 mm | 83% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Storm Lake. Values describe typical conditions, not a forecast.
About Storm Lake weather
Storm Lake is a place in Iowa's humid continental climate, typical of the US corn belt, located about 176 km north-west of Des Moines. Storm Lake gets warm, humid summers (June–August) each year. Storm Lake closes out the year with cold winters (December–February) with regular snow. This page shows live, auto-refreshing weather for Storm Lake: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Storm Lake is about 176 km north-west of Des Moines, in Iowa.
Storm Lake sees cold winters (December–February) with regular snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Storm Lake's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Storm Lake, with average daytime highs of about 30°C and nights around 18°C.
The coldest nights come in January, when the average low is about -12°C and daytime highs reach around -2°C. Frost is possible on clear, calm nights.
Storm Lake receives about 800 mm of rain in a typical year. June is the wettest month at roughly 121 mm, and the main rainy period is May to June and August.
July and September usually offer the most comfortable weather in Storm Lake, with mild daytime temperatures and little rain.
In November Storm Lake typically sees daytime highs near 8°C and lows near -2°C, with about 35 mm of rain over the month and average humidity around 75%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Storm Lake updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Storm Lake's day-to-day weather follows the broader pattern of Iowa described above. See the hourly weather forecast or the air quality index for more detail.