Juneau weather in September

In September, Juneau sees average daytime highs of 53°F and overnight lows near 43°F, with 13.0 in of precipitation across 21 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 56°F in the first days to 50°F by the end. The sky is clear or mostly clear about 11% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 48 min at the start of September to 11 h 18 min by month's end. Set against the rest of the year, September is Juneau's 10th-clearest and 7th-windiest month. For the whole year in context, see Juneau's year-round climate.

Daytime high: 53°; 4th warmest
Overnight low: 43°; 9th coldest
Precipitation: 13.0 in; 21 wet days
Daylight: 12 h 30 min; 5:37 AM – 6:07 PM
Cloud cover: 81%; 10th clearest
Wind: 5 mph; 7th windiest
Solar energy: 2.04 kWh/m²
Travel score: 2.2; out of 10

Juneau is consolidated city-borough and capital of the U.S. state of Alaska.

Density: 4/km²; people per km²
Founded: 1881

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Juneau year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 56°F in the first days to 50°F by the end.

A typical September day in Juneau reaches about 53°F in the afternoon and slips back to 43°F overnight — a 10°F spread between the day's warmth and the night's chill. On most days the high lands between 48°F and 59°F. Set against its neighbours, September runs about 6°F cooler than August and about 11°F warmer than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°F)	56	56	56	56	56	56	55	55	55	55	55	55	54	54	54	53	53	53	53	52	52	52	51	51	51	51	50	50	49	49
Avg low (°F)	46	46	46	46	46	45	45	45	45	44	44	44	44	44	44	43	43	43	43	42	42	42	42	41	41	41	40	40	40	40

	Avg high (°F)	Avg low (°F)
1	56	46
2	56	46
3	56	46
4	56	46
5	56	46
6	56	45
7	55	45
8	55	45
9	55	45
10	55	44
11	55	44
12	55	44
13	54	44
14	54	44
15	54	44
16	53	43
17	53	43
18	53	43
19	53	43
20	52	42
21	52	42
22	52	42
23	51	42
24	51	41
25	51	41
26	51	41
27	50	40
28	50	40
29	49	40
30	49	40

How September really feels in Juneau

Once humidity and wind are folded in, September averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Juneau weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	27° / 19°	9.8	19.8	19.4	6.8	0.0
Feb	29° / 20°	7.4	16.6	15.9	8.9	0.0
Mar	33° / 22°	7.2	17.9	17.7	11.4	0.0
Apr	41° / 30°	5.6	16.5	11.9	14	0.2
May	50° / 37°	5.4	16	3.6	16.4	1.9
Jun	58° / 46°	5.3	16.5	0	17.8	3.3
Jul	60° / 50°	7.0	18.9	0	17.2	3.7
Aug	59° / 49°	9.3	19.3	0	15.1	3.5
Sep	53° / 43°	13.0	21	0.2	12.5	2.2
Oct	43° / 34°	13.0	22.7	8.2	9.9	0.4
Nov	33° / 24°	10.3	20.9	18.6	7.5	0.0
Dec	29° / 21°	10.8	21.1	20.4	6.2	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 83%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	16	17	17	17	18	19	20	20	20	20	20	20	20	19	19	18	18	17	16	16	16	15	15	15	16	15	15	15	16	16
Cloudier (%)	84	83	83	83	82	81	80	80	80	80	80	80	80	81	81	82	82	83	84	84	84	85	85	85	84	85	85	85	84	84

	Clearer (%)	Cloudier (%)
1	16	84
2	17	83
3	17	83
4	17	83
5	18	82
6	19	81
7	20	80
8	20	80
9	20	80
10	20	80
11	20	80
12	20	80
13	20	80
14	19	81
15	19	81
16	18	82
17	18	82
18	17	83
19	16	84
20	16	84
21	16	84
22	15	85
23	15	85
24	15	85
25	16	84
26	15	85
27	15	85
28	15	85
29	16	84
30	16	84

Chance of precipitation in September

Any precipitationSnow

Juneau gets around 13.0 in of rain and snow over 21 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 70% and peaks near 73% on the wettest days, and about 0 day brings snow.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	71	70	70	69	69	68	68	67	67	67	67	67	68	68	68	69	69	70	70	71	72	72	73	73	73	73	73	73	73	73
Snow chance (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	1	2	2	3	3	4

	Rain chance (%)	Snow chance (%)
1	71	0
2	70	0
3	70	0
4	69	0
5	69	0
6	68	0
7	68	0
8	67	0
9	67	0
10	67	0
11	67	0
12	67	0
13	68	0
14	68	0
15	68	0
16	69	0
17	69	0
18	70	1
19	70	1
20	71	1
21	72	1
22	72	1
23	73	1
24	73	1
25	73	1
26	73	2
27	73	2
28	73	3
29	73	3
30	73	4

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 4 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (mph)	4	4	4	4	4	4	4	4	4	4	4	4	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (mph)	Feels
1	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	5	calm
23	5	calm
24	5	calm
25	5	calm
26	5	calm
27	5	calm
28	5	calm
29	5	calm
30	5	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 48 min at the start of September to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 150 minutes over September. Sunrise moves from 5:03 AM to 6:09 AM, and sunset from 6:51 PM to 5:25 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	13.8	13.7	13.6	13.5	13.5	13.4	13.3	13.2	13.1	13.0	12.9	12.8	12.8	12.7	12.6	12.5	12.4	12.3	12.2	12.2	12.1	12.0	11.9	11.8	11.7	11.6	11.5	11.5	11.4	11.3
Sunrise (AM)	5:03	5:06	5:08	5:10	5:12	5:15	5:17	5:19	5:21	5:24	5:26	5:28	5:30	5:33	5:35	5:37	5:39	5:41	5:44	5:46	5:48	5:50	5:53	5:55	5:57	5:59	6:02	6:04	6:06	6:09
Sunset (PM)	6:51	6:48	6:46	6:43	6:40	6:37	6:34	6:31	6:28	6:25	6:22	6:19	6:16	6:13	6:10	6:07	6:04	6:01	5:58	5:55	5:52	5:49	5:46	5:43	5:40	5:37	5:34	5:31	5:28	5:25

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.8	5:03	6:51
2	13.7	5:06	6:48
3	13.6	5:08	6:46
4	13.5	5:10	6:43
5	13.5	5:12	6:40
6	13.4	5:15	6:37
7	13.3	5:17	6:34
8	13.2	5:19	6:31
9	13.1	5:21	6:28
10	13.0	5:24	6:25
11	12.9	5:26	6:22
12	12.8	5:28	6:19
13	12.8	5:30	6:16
14	12.7	5:33	6:13
15	12.6	5:35	6:10
16	12.5	5:37	6:07
17	12.4	5:39	6:04
18	12.3	5:41	6:01
19	12.2	5:44	5:58
20	12.2	5:46	5:55
21	12.1	5:48	5:52
22	12.0	5:50	5:49
23	11.9	5:53	5:46
24	11.8	5:55	5:43
25	11.7	5:57	5:40
26	11.6	5:59	5:37
27	11.5	6:02	5:34
28	11.5	6:04	5:31
29	11.4	6:06	5:28
30	11.3	6:09	5:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.04 kWh/m².

For context, solar energy here swings from a low near 0.29 kWh/m² to a high of 5.09 kWh/m² in May across the year — September's 2.04 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	2.6	2.5	2.5	2.5	2.5	2.4	2.4	2.4	2.3	2.3	2.2	2.2	2.2	2.1	2.1	2.0	2.0	1.9	1.9	1.8	1.8	1.8	1.7	1.7	1.6	1.6	1.6	1.6	1.6	1.5
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim

	Solar energy (kWh/m²)	Level
1	2.6	Moderate
2	2.5	Moderate
3	2.5	Moderate
4	2.5	Moderate
5	2.5	Moderate
6	2.4	Moderate
7	2.4	Moderate
8	2.4	Moderate
9	2.3	Moderate
10	2.3	Moderate
11	2.2	Moderate
12	2.2	Moderate
13	2.2	Moderate
14	2.1	Moderate
15	2.1	Moderate
16	2.0	Moderate
17	2.0	Dim
18	1.9	Dim
19	1.9	Dim
20	1.8	Dim
21	1.8	Dim
22	1.8	Dim
23	1.7	Dim
24	1.7	Dim
25	1.6	Dim
26	1.6	Dim
27	1.6	Dim
28	1.6	Dim
29	1.6	Dim
30	1.5	Dim

Planning a trip in September

Is September a good time to visit Juneau?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

2.2

Sightseeing

4th-best month of the year

—

Beach & pool

never really warm enough

September is a weaker month for outdoor sightseeing in Juneau.

What to pack for Juneau in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Juneau sees daytime highs around 53°F and nights near 43°F. Pack a warm layer and rain gear. About 21 days see rain.

a warm layerrain gear

UV index in Juneau in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Juneau peaks around July 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	1	2	4	5	7	9	5	4	1	1	0
Level	Low	Low	Moderate	Moderate	Moderate	High	Very high	High	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	1	Low
Mar	2	Moderate
Apr	4	Moderate
May	5	Moderate
Jun	7	High
Jul	9	Very high
Aug	5	High
Sep	4	Moderate
Oct	1	Low
Nov	1	Low
Dec	0	Low

Location & terrain

Where is Juneau?

Juneau sits at 58.3°N, 134.4°W, 56 ft above sea level, in United States. The nearest listed city is Whitehorse, 168 mi away.

Topography around Juneau

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Juneau.

Within 2 miles, the terrain around Juneau has large variations in elevation — a maximum elevation change of 3,556 ft around an average of 945 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,486 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 7,946 ft.

The land around Juneau is covered by trees (57%) within 2 miles, trees (40%) and water (22%) within 10 miles, and trees (35%), snow and ice (25%) and water (24%) within 50 miles.

2 miles

3,556 ft

trees 57%

10 miles

5,486 ft

trees 40%

50 miles

7,946 ft

trees 35%

treesgrasslandartificial surfacesbare terrainsnow and icewatermoss and lichen

← August Juneau year-round climate October →Best places to visit in September

September weather nearby: Whitehorse 168 mi · Terrace 343 mi · Dawson City 431 mi · Fort St. John 525 mi · Prince George 541 mi · Eagle River 564 mi · Anchorage 574 mi · Badger 621 mi

United States travel facts

Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 100% of US; price level, 2025
GDP per capita: $90,027; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 5.8; per 100k, 2023
Road deaths: 12.7; per 100k/yr, 2019
Income group: High; World Bank
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Juneau (58.3019°, -134.4197°, elevation 56 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°F)	Avg low (°F)
1	56	46
2	56	46
3	56	46
4	56	46
5	56	46
6	56	45
7	55	45
8	55	45
9	55	45
10	55	44
11	55	44
12	55	44
13	54	44
14	54	44
15	54	44
16	53	43
17	53	43
18	53	43
19	53	43
20	52	42
21	52	42
22	52	42
23	51	42
24	51	41
25	51	41
26	51	41
27	50	40
28	50	40
29	49	40
30	49	40

	Clearer (%)	Cloudier (%)
1	16	84
2	17	83
3	17	83
4	17	83
5	18	82
6	19	81
7	20	80
8	20	80
9	20	80
10	20	80
11	20	80
12	20	80
13	20	80
14	19	81
15	19	81
16	18	82
17	18	82
18	17	83
19	16	84
20	16	84
21	16	84
22	15	85
23	15	85
24	15	85
25	16	84
26	15	85
27	15	85
28	15	85
29	16	84
30	16	84

	Rain chance (%)	Snow chance (%)
1	71	0
2	70	0
3	70	0
4	69	0
5	69	0
6	68	0
7	68	0
8	67	0
9	67	0
10	67	0
11	67	0
12	67	0
13	68	0
14	68	0
15	68	0
16	69	0
17	69	0
18	70	1
19	70	1
20	71	1
21	72	1
22	72	1
23	73	1
24	73	1
25	73	1
26	73	2
27	73	2
28	73	3
29	73	3
30	73	4

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0

	Avg high (°F)	Avg low (°F)
1	56	46
2	56	46
3	56	46
4	56	46
5	56	46
6	56	45
7	55	45
8	55	45
9	55	45
10	55	44
11	55	44
12	55	44
13	54	44
14	54	44
15	54	44
16	53	43
17	53	43
18	53	43
19	53	43
20	52	42
21	52	42
22	52	42
23	51	42
24	51	41
25	51	41
26	51	41
27	50	40
28	50	40
29	49	40
30	49	40

	Clearer (%)	Cloudier (%)
1	16	84
2	17	83
3	17	83
4	17	83
5	18	82
6	19	81
7	20	80
8	20	80
9	20	80
10	20	80
11	20	80
12	20	80
13	20	80
14	19	81
15	19	81
16	18	82
17	18	82
18	17	83
19	16	84
20	16	84
21	16	84
22	15	85
23	15	85
24	15	85
25	16	84
26	15	85
27	15	85
28	15	85
29	16	84
30	16	84

	Rain chance (%)	Snow chance (%)
1	71	0
2	70	0
3	70	0
4	69	0
5	69	0
6	68	0
7	68	0
8	67	0
9	67	0
10	67	0
11	67	0
12	67	0
13	68	0
14	68	0
15	68	0
16	69	0
17	69	0
18	70	1
19	70	1
20	71	1
21	72	1
22	72	1
23	73	1
24	73	1
25	73	1
26	73	2
27	73	2
28	73	3
29	73	3
30	73	4

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0

	Avg high (°F)	Avg low (°F)
1	56	46
2	56	46
3	56	46
4	56	46
5	56	46
6	56	45
7	55	45
8	55	45
9	55	45
10	55	44
11	55	44
12	55	44
13	54	44
14	54	44
15	54	44
16	53	43
17	53	43
18	53	43
19	53	43
20	52	42
21	52	42
22	52	42
23	51	42
24	51	41
25	51	41
26	51	41
27	50	40
28	50	40
29	49	40
30	49	40

	Clearer (%)	Cloudier (%)
1	16	84
2	17	83
3	17	83
4	17	83
5	18	82
6	19	81
7	20	80
8	20	80
9	20	80
10	20	80
11	20	80
12	20	80
13	20	80
14	19	81
15	19	81
16	18	82
17	18	82
18	17	83
19	16	84
20	16	84
21	16	84
22	15	85
23	15	85
24	15	85
25	16	84
26	15	85
27	15	85
28	15	85
29	16	84
30	16	84

	Rain chance (%)	Snow chance (%)
1	71	0
2	70	0
3	70	0
4	69	0
5	69	0
6	68	0
7	68	0
8	67	0
9	67	0
10	67	0
11	67	0
12	67	0
13	68	0
14	68	0
15	68	0
16	69	0
17	69	0
18	70	1
19	70	1
20	71	1
21	72	1
22	72	1
23	73	1
24	73	1
25	73	1
26	73	2
27	73	2
28	73	3
29	73	3
30	73	4

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0