Early autumn · Weather & things to do
Decorah in September
Decorah cools off: highs slip to 73°F (23°C), from 80°F in August, with lows of 53°F (11°C) and about 4.0 in (101 mm) of rain.
At 87/100 for comfort (the top score of the year), it's one of the best months to visit.
- Avg high
- 73°F (23°C)
- Avg low
- 53°F (11°C)
- Rain
- 4.0 in (101 mm)
- Humidity
- 75%
- Cloud cover
- 47%
- Daylight
- ~12 h 17 min
- Comfort score
- 87/100 · Great
What September feels like
Highs settle around 73°F (23°C), warm enough for short sleeves most of the day.
After dark, temperatures fall to about 53°F (11°C).
Some rain is likely, about 4.0 in (101 mm) in the month, so pack for a shower or two.
Plan around September
September is one of Decorah's best months on the climate data.
- Last warm month for a while: October highs fall to 58°F.
- Last of the best-scoring months: by October, the score drops to 75/100.
- Comfort improves from 81/100 in August to 87/100.
- September sits inside the May – Oct window our Iowa Driftless & River Towns route recommends.
What to pack for September
- Light, breathable clothes73°F afternoons
- Packable rain jacket or umbrellaa shower or two is likely
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Decorah in September
September is good outdoor weather here, so these picks lean toward the open air.
Effigy Mounds National Monument
Ancient Native American animal-shaped mounds on Mississippi River bluffs.
Why now Our curated notes say it's best fall.
Seed Savers Exchange Heritage Farm
Heirloom gardens, orchards and trails on an 890-acre farm.
Why now Our curated notes say it's best Jun–Sep.
Oneota Community Food Co-op
Local grocery with a deli for sandwiches and picnic supplies.
Toppling Goliath Brewing Co.
Taproom of the brewery behind Pseudo Sue and other hoppy cult beers.
Trout Run Trail
11-mile paved bike loop past a trout hatchery, bluffs and farmland.
Why now September scores 87/100 for comfort, good conditions for being outside.
Nearby in September
- Dubuque in September~79 mi · highs 76°F, 3.9 in rain · 1°C (2°F) warmer by day, about as wet
- Minneapolis in September~137 mi · highs 73°F, 3.5 in rain · similar daytime temperatures, about as wet
- Des Moines in September~151 mi · highs 78°F, 3.4 in rain · 3°C (5°F) warmer by day, about as wet
- Milwaukee in September~196 mi · highs 74°F, 3.5 in rain · similar daytime temperatures, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Decorah in September: quick answers
Is September a good time to visit Decorah?
Yes. On the climate data it's one of the best months, scoring 87/100. Expect highs of 73°F (23°C) and 4.0 in (101 mm) of rain. September is inside the May – Oct window our Iowa Driftless & River Towns route recommends.
How hot is Decorah in September?
Average highs are 73°F (23°C) and average lows 53°F (11°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Decorah in September?
Some: about 4.0 in (101 mm) of rain falls across September on average, the 5th-wettest month of the year. The annual total is about 37.0 in (939 mm).
What should I pack for Decorah in September?
Bring light, breathable clothes (73°F afternoons), packable rain jacket or umbrella (a shower or two is likely) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Decorah
Routes in season in September
- Iowa Driftless & River Towns May – Oct
Planning Decorah in September?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.