Alaska (Juneau) · September
Best travel monthTravel seasonUSA · North America
Climate Overview
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ø day, range from coolest to warmest dayØ dayrange | 2° (36°)-8– (18–)7 (45) | 2° (36°)-6– (21–)8 (46) | 4° (39°)-3– (27–)9 (48) | 9° (48°)3– (37–)15 (59) | 14° (57°)7– (45–)22 (72) | 16° (61°)10– (50–)25 (77) | 17° (63°)12– (54–)24 (75) | 17° (63°)11– (52–)23 (73) | 13° (55°)9– (48–)18 (64) | 9° (48°)4– (39–)13 (55) | 4° (39°)-3– (27–)9 (48) | 2° (36°)-6– (21–)7 (45) |
Ø night, range from coldest to warmest nightØ nightrange | -2° (28°)-13– (9–)4 (39) | -2° (28°)-12– (10–)3 (37) | -1° (30°)-9– (16–)3 (37) | 2° (36°)-3– (27–)6 (43) | 7° (45°)1– (34–)10 (50) | 10° (50°)5– (41–)13 (55) | 12° (54°)8– (46–)13 (55) | 11° (52°)7– (45–)14 (57) | 9° (48°)3– (37–)12 (54) | 5° (41°)-2– (28–)9 (48) | 0° (32°)-8– (18–)5 (41) | -1° (30°)-10– (14–)4 (39) |
☀️Sunshine | 1h UV 1 | 3h UV 2 | 4h UV 4 | 6h UV 5 | 8h UV 6 | 6h UV 6 | 5h UV 5 | 5h UV 4 | 2h UV 3 | 3h UV 2 | 3h UV 2 | 2h UV 1 |
🌊Water Temp | 6° (43°) | 5° (41°) | 5° (41°) | 6° (43°) | 8° (46°) | 11° (52°) | 13° (55°) | 14° (57°) | 13° (55°) | 11° (52°) | 8° (46°) | 7° (45°) |
🌧Rain Days | 16d176mm (6.9") | 11d108mm (4.2") | 11d90mm (3.5") | 11d94mm (3.7") | 10d96mm (3.8") | 10d103mm (4.0") | 13d134mm (5.3") | 15d175mm (6.9") | 18d229mm (9.0") | 17d219mm (8.6") | 16d165mm (6.5") | 14d155mm (6.1") |
Best travel time current monthØ = average · small figures = range: coolest–warmest day / coldest–warmest nightClimate data 2005–2025 · Source: ERA5 + station data
Travel season — mid-range prices, good availability.
September is one of the best travel months for Alaska (Juneau) — conditions are stable, temperatures reach 13°C (55°F), and outdoor activities are excellent.
Daytime highs average 13°C (55°F), cooling to 9°C (48°F) at night (daily average: 11°C (52°F)). Peaks reach around 18°C (64°F), the coldest nights around 3°C (37°F). With 2 sunshine hours per day and 18 rain days (229 mm (9.0 in)), this is one of the cloudier months. At 13°C (55°F), the water is still quite cool in September — a wetsuit may be useful.
Layer up — warm days and cool evenings alternate. Perfect timing for hikes and sightseeing.
The rain returns, the deciduous woods turn yellow and the cruise season ends. The town grows quieter, the salmon runs wind down and the first snow reaches the peaks. Those who bring a rain jacket and patience find low prices and dramatic cloud moods.
Packing list for Alaska (Juneau) in September
- Warm jacket
- Jumpers and warm layers
- Long trousers
- Warm shoes
- Rain jacket and waterproof shoes
- Travel first-aid kit
Frequently Asked Questions
- Is September a good time to visit Alaska (Juneau)?
- Yes — September is one of the best months to visit Alaska (Juneau) (Climate Score: 22/100). Pleasant temperatures (13°C (55°F)), good sunshine (2 h/day), and few rain days (18) make it one of the most recommended months.
- How warm is it in Alaska (Juneau) in September?
- In September, Alaska (Juneau) sees daily highs of 13°C (55°F). Nights cool to 9°C (48°F), with a daily average of 11°C (52°F). Peaks reach around 18°C (64°F), the coldest nights around 3°C (37°F).
- How much rain falls in Alaska (Juneau) in September?
- In September, Alaska (Juneau) receives an average of 229 mm (9.0 in) of rain over 18 rain days. With frequent rain days, waterproof clothing is recommended.
- How many sunshine hours does Alaska (Juneau) get in September?
- Alaska (Juneau) averages 2 sunshine hours per day in September — below the annual average.
- How warm is the water in Alaska (Juneau) in September?
- Water temperature in Alaska (Juneau) in September averages 13°C (55°F) — still quite cool — a wetsuit may be useful.
