September · United States
Best time to visit Juneau in September Weather, crowds & prices
Weather in Juneau in September
Average temperature 7°C, 445 mm of rain, about 0 days with 6+ hours of sunshine and 93% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
3.2/10
Ranked #6 of 12 months
- Avg temp
- 7°C
- Rainfall
- 445 mm
- Humidity
- 93%
- Days with 6h+ sun
- 0
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Juneau scores 3.2/10 for nature and wildlife travel - an above-average month (#6 of 12). Expect around 7°C, 445 mm of rain, and roughly 0 days with 6+ hours of sunshine this month.
Juneau is Alaska's car-free capital, reached by air or sea, with glaciers and rainforest at its edge.
September in Juneau — the hardest end of the year
September averages 7°C (44°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
445 mm of rain puts this in monsoon territory — almost no days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 3.2/10 here, 6th of 12 months, against 6.5/10 in the destination's best month.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a proper rain shell rather than an umbrella, footwear you can get muddy.
Figure on mid-season pricing, with crowds are moderate.
Flexible dates? June scores 3.3 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Juneau in September?
- In September, Juneau averages 7°C, 445 mm of rain, and about 0 days with 6+ hours of sunshine. Its climate-comfort score is 3.2/10.
- Is September a good time to visit Juneau?
- September earns a 3.2/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Juneau in September?
- Expect about 445 mm of rain in September. Average humidity is 93% and there are about 0 days with 6+ hours of sunshine.
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Juneau, United States. Live activities and tours from GetYourGuide, matched to this destination.