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Best time to visit · Iowa, United States
For the most comfortable weather in Decorah, aim for August & September. September tops our comfort score at 87/100, with highs around 73°F (23°C) and 4.0 in (101 mm) of rain. May – July and October are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
Highs run from 25°F to 83°F across the year, and the yearly total is about 37.0 in (939 mm) of rain and snow.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 25°F-4°C | 29°F-2°C | 43°F6°C | 57°F14°C | 68°F20°C | 78°F25°C | 83°F28°C | 80°F27°C | 73°F23°C | 58°F14°C | 43°F6°C | 30°F-1°C |
| Avg low | 8°F-13°C | 10°F-12°C | 24°F-4°C | 35°F2°C | 48°F9°C | 59°F15°C | 64°F18°C | 61°F16°C | 53°F11°C | 38°F4°C | 27°F-3°C | 15°F-9°C |
| Rain/snow | 1.0 in26 mm | 1.3 in32 mm | 2.0 in51 mm | 3.8 in96 mm | 4.7 in120 mm | 5.8 in147 mm | 4.0 in102 mm | 4.2 in106 mm | 4.0 in101 mm | 2.9 in73 mm | 1.7 in43 mm | 1.7 in42 mm |
| Humidity | 89% | 87% | 80% | 76% | 77% | 78% | 75% | 75% | 75% | 77% | 81% | 88% |
| Cloud | 65% | 64% | 64% | 62% | 64% | 58% | 49% | 51% | 47% | 59% | 64% | 71% |
| Comfort | 48 | 49 | 51 | 70 | 79 | 72 | 78 | 81 | 87 | 75 | 53 | 46 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. The grid cell sits at about 343 m (1,125 ft), close to Decorah's own ~266 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The coldest season, with highs of 25–30°F (-4–-1°C) and lows down to 8°F (-13°C). It's the driest season, with only about 3.9 in (100 mm) of rain or snow, 11% of the year's total. December – February are cold enough for snow. It holds the toughest stretch on our comfort score (December – February), averaging 48/100.
Temperatures climb through the season, from 43°F highs in March to 68°F by May. About 10.5 in (267 mm) of rain or snow falls across these months, 28% of the year's total. March is cold enough for snow. May score well without being the very best (season average 67/100).
The warmest stretch of the year, with highs of 78–83°F (25–28°C). It's the wettest season, with about 14.0 in (355 mm) of rain, 38% of the year's total. June – August feel humid, with humidity near 78%. Comfort peaks here: August ranks with the year's best, and the season averages 77/100.
Temperatures slide from 73°F highs in September to 43°F by November. About 8.5 in (217 mm) of rain or snow falls across these months, 23% of the year's total. November is cold enough for snow. September is among the best-scoring months (season average 72/100).
By comfort score: 5 Great, 2 Good and 5 Fair. Great months: May and July – October. Tap a month for its own guide.
For the most comfortable weather in Decorah, aim for August & September. September tops our comfort score at 87/100, with highs around 73°F (23°C) and 4.0 in (101 mm) of rain. May – July and October are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
June is the wettest month, averaging about 5.8 in (147 mm) of rain. January is the driest, with about 1.0 in (26 mm). The yearly total is around 37.0 in (939 mm).
January is the coldest, with average lows of 8°F (-13°C) and highs of 25°F (-4°C). The warmest is July, with average highs of 83°F (28°C).
Yes: in June – August humidity averages 78% with warm temperatures, so it feels muggy. Summer highs peak around 83°F (28°C).
On average, yes: lows fall below 32°F (0°C) in November – March, bottoming out around 8°F (-13°C) in January.
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