Anchorage weather in September

In September, Anchorage sees average daytime highs of 54°F and overnight lows near 46°F, with 4.6 in of precipitation across 15.3 wet days and about 12.6 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 58°F in the first days to 49°F by the end. The sky is clear or mostly clear about 19% of the time in September, and the air most often feels dry.

Daylight stretches from about 14 hours at the start of September to 11 h 12 min by month's end. Set against the rest of the year, September is Anchorage's 9th-clearest and 7th-windiest month. For the whole year in context, see Anchorage's year-round climate.

Daytime high: 54°; 4th warmest
Overnight low: 46°; 9th coldest
Precipitation: 4.6 in; 15.3 wet days
Daylight: 12 h 36 min; 6:37 AM – 7:11 PM
Cloud cover: 71%; 9th clearest
Wind: 5 mph; 7th windiest
Solar energy: 2.32 kWh/m²
Travel score: 2.8; out of 10

Anchorage is consolidated city-borough and largest city in the U.S. state of Alaska.

Density: 57/km²; people per km²
Founded: 1914

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

← August Anchorage 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 58°F in the first days to 49°F by the end.

A typical September day in Anchorage reaches about 54°F in the afternoon and slips back to 46°F overnight — a 8°F spread between the day's warmth and the night's chill. On most days the high lands between 49°F and 58°F. Set against its neighbours, September runs about 7°F cooler than August and about 13°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)	58	58	58	58	57	57	57	57	56	56	56	55	55	55	54	54	54	53	53	52	52	51	51	51	50	50	49	49	49	48
Avg low (°F)	50	50	50	49	49	49	49	48	48	48	48	47	47	47	46	46	46	45	45	44	44	44	43	43	42	42	42	41	41	40

	Avg high (°F)	Avg low (°F)
1	58	50
2	58	50
3	58	50
4	58	49
5	57	49
6	57	49
7	57	49
8	57	48
9	56	48
10	56	48
11	56	48
12	55	47
13	55	47
14	55	47
15	54	46
16	54	46
17	54	46
18	53	45
19	53	45
20	52	44
21	52	44
22	51	44
23	51	43
24	51	43
25	50	42
26	50	42
27	49	42
28	49	41
29	49	41
30	48	40

How September really feels in Anchorage

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.

Anchorage 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	21° / 14°	2.0	10.4	10.7	6	0.0
Feb	26° / 18°	1.9	9.6	9.4	8.5	0.0
Mar	32° / 21°	1.5	8.5	8.5	11.3	0.0
Apr	42° / 30°	1.2	7.3	4	14.3	0.5
May	51° / 39°	1.2	7.1	0.6	17	2.7
Jun	59° / 49°	1.6	9	0	18.8	4.5
Jul	62° / 54°	2.9	12.5	0	18.1	4.9
Aug	61° / 53°	4.2	14.8	0	15.5	4.4
Sep	54° / 46°	4.6	15.3	0.4	12.6	2.8
Oct	41° / 33°	3.5	13.2	4.1	9.6	0.4
Nov	29° / 22°	2.6	11.7	9.3	6.9	0.0
Dec	23° / 16°	2.9	12.8	13	5.2	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 69%.

	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 (%)	33	33	33	33	33	32	32	32	31	31	31	31	31	30	30	29	29	29	29	29	29	30	31	31	31	31	31	32	32	32
Cloudier (%)	67	67	67	67	67	68	68	68	69	69	69	69	69	70	70	71	71	71	71	71	71	70	69	69	69	69	69	68	68	68

	Clearer (%)	Cloudier (%)
1	33	67
2	33	67
3	33	67
4	33	67
5	33	67
6	32	68
7	32	68
8	32	68
9	31	69
10	31	69
11	31	69
12	31	69
13	31	69
14	30	70
15	30	70
16	29	71
17	29	71
18	29	71
19	29	71
20	29	71
21	29	71
22	30	70
23	31	69
24	31	69
25	31	69
26	31	69
27	31	69
28	32	68
29	32	68
30	32	68

Chance of precipitation in September

Any precipitationSnow

Anchorage gets around 4.6 in of rain and snow over 15.3 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 51% and peaks near 53% 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 (%)	48	48	48	48	48	48	48	49	49	50	50	51	51	51	52	52	53	53	53	53	53	53	53	53	53	52	52	52	51	51
Snow chance (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	2	2	2	3	3	3	3	4	4	4

	Rain chance (%)	Snow chance (%)
1	48	0
2	48	0
3	48	0
4	48	0
5	48	0
6	48	0
7	48	0
8	49	0
9	49	0
10	50	0
11	50	0
12	51	0
13	51	0
14	51	0
15	52	0
16	52	0
17	53	1
18	53	1
19	53	1
20	53	1
21	53	2
22	53	2
23	53	2
24	53	3
25	53	3
26	52	3
27	52	3
28	52	4
29	51	4
30	51	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 (%)	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	100	100

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

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	5	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	5	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 14 hours at the start of September to 11 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 168 minutes over September. Sunrise moves from 5:59 AM to 7:13 AM, and sunset from 8:00 PM to 6:25 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)	14.0	13.9	13.8	13.7	13.6	13.5	13.4	13.3	13.2	13.1	13.1	13.0	12.9	12.8	12.7	12.6	12.5	12.4	12.3	12.2	12.1	12.0	11.9	11.8	11.7	11.6	11.5	11.4	11.3	11.2
Sunrise (AM)	5:59	6:01	6:04	6:06	6:09	6:11	6:14	6:17	6:19	6:22	6:24	6:27	6:29	6:32	6:34	6:37	6:40	6:42	6:45	6:47	6:50	6:52	6:55	6:58	7:00	7:03	7:05	7:08	7:11	7:13
Sunset (PM)	8:00	7:57	7:54	7:50	7:47	7:44	7:41	7:37	7:34	7:31	7:27	7:24	7:21	7:17	7:14	7:11	7:08	7:04	7:01	6:58	6:54	6:51	6:48	6:44	6:41	6:38	6:35	6:31	6:28	6:25

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	14.0	5:59	8:00
2	13.9	6:01	7:57
3	13.8	6:04	7:54
4	13.7	6:06	7:50
5	13.6	6:09	7:47
6	13.5	6:11	7:44
7	13.4	6:14	7:41
8	13.3	6:17	7:37
9	13.2	6:19	7:34
10	13.1	6:22	7:31
11	13.1	6:24	7:27
12	13.0	6:27	7:24
13	12.9	6:29	7:21
14	12.8	6:32	7:17
15	12.7	6:34	7:14
16	12.6	6:37	7:11
17	12.5	6:40	7:08
18	12.4	6:42	7:04
19	12.3	6:45	7:01
20	12.2	6:47	6:58
21	12.1	6:50	6:54
22	12.0	6:52	6:51
23	11.9	6:55	6:48
24	11.8	6:58	6:44
25	11.7	7:00	6:41
26	11.6	7:03	6:38
27	11.5	7:05	6:35
28	11.4	7:08	6:31
29	11.3	7:11	6:28
30	11.2	7:13	6:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.32 kWh/m².

For context, solar energy here swings from a low near 0.16 kWh/m² to a high of 5.49 kWh/m² in June across the year — September's 2.32 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)	3.0	2.9	2.9	2.8	2.8	2.8	2.7	2.7	2.6	2.6	2.5	2.5	2.4	2.4	2.3	2.3	2.2	2.2	2.1	2.1	2.1	2.0	2.0	1.9	1.9	1.9	1.8	1.8	1.8	1.7
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim

	Solar energy (kWh/m²)	Level
1	3.0	Moderate
2	2.9	Moderate
3	2.9	Moderate
4	2.8	Moderate
5	2.8	Moderate
6	2.8	Moderate
7	2.7	Moderate
8	2.7	Moderate
9	2.6	Moderate
10	2.6	Moderate
11	2.5	Moderate
12	2.5	Moderate
13	2.4	Moderate
14	2.4	Moderate
15	2.3	Moderate
16	2.3	Moderate
17	2.2	Moderate
18	2.2	Moderate
19	2.1	Moderate
20	2.1	Moderate
21	2.1	Moderate
22	2.0	Moderate
23	2.0	Dim
24	1.9	Dim
25	1.9	Dim
26	1.9	Dim
27	1.8	Dim
28	1.8	Dim
29	1.8	Dim
30	1.7	Dim

Planning a trip in September

Hazard calendar for Anchorage

In seasonPeak

In September, Anchorage sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Anchorage's rainy season runs July–December, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Anchorage?

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

2.8

Sightseeing

4th-best month of the year

—

Beach & pool

never really warm enough

September is a weaker month for outdoor sightseeing in Anchorage.

What to pack for Anchorage in September

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

In September, Anchorage sees daytime highs around 54°F and nights near 46°F. Pack rain gear. Worth having: a warm layer. About 15 days see rain.

rain geara warm layer

Sea temperature near Anchorage in September

The nearest coast averages about 54°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 10 mi away) is warmest in August at about 57°F and coldest in February near 31°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°F)	31	31	31	32	36	48	55	57	54	47	40	32
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°F)	Comfort
Jan	31	Bracing
Feb	31	Bracing
Mar	31	Bracing
Apr	32	Bracing
May	36	Bracing
Jun	48	Bracing
Jul	55	Bracing
Aug	57	Bracing
Sep	54	Bracing
Oct	47	Bracing
Nov	40	Bracing
Dec	32	Bracing

UV index in Anchorage in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Anchorage peaks around June 23 at about 5 (moderate) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	1	1	3	4	5	5	4	2	1	0	0
Level	Low	Low	Low	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	1	Low
Mar	1	Low
Apr	3	Moderate
May	4	Moderate
Jun	5	Moderate
Jul	5	Moderate
Aug	4	Moderate
Sep	2	Moderate
Oct	1	Low
Nov	0	Low
Dec	0	Low

Location & terrain

Where is Anchorage?

Anchorage sits at 61.2°N, 149.9°W, 102 ft above sea level, in United States. The nearest listed city is Eagle River, 13 mi away.

Topography around Anchorage

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

Within 2 miles, the terrain around Anchorage has only modest variations in elevation — a maximum elevation change of 194 ft around an average of 56 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,386 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,769 ft.

The land around Anchorage is covered by water (39%) and artificial surfaces (32%) within 2 miles, trees (39%) and water (35%) within 10 miles, and trees (42%) and grassland (23%) within 50 miles.

2 miles

194 ft

water 39%

10 miles

3,386 ft

trees 39%

50 miles

7,769 ft

trees 42%

treesgrasslandartificial surfacesbare terrainsnow and icewaterwetlandmoss and lichen

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

September weather nearby: Eagle River 13 mi · Badger 258 mi · Fairbanks 259 mi · Dawson City 385 mi · Whitehorse 498 mi · Juneau 574 mi · Terrace 903 mi · Anadyr 1,039 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 Anchorage (61.2181°, -149.9003°, elevation 102 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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	58	50
2	58	50
3	58	50
4	58	49
5	57	49
6	57	49
7	57	49
8	57	48
9	56	48
10	56	48
11	56	48
12	55	47
13	55	47
14	55	47
15	54	46
16	54	46
17	54	46
18	53	45
19	53	45
20	52	44
21	52	44
22	51	44
23	51	43
24	51	43
25	50	42
26	50	42
27	49	42
28	49	41
29	49	41
30	48	40

	Clearer (%)	Cloudier (%)
1	33	67
2	33	67
3	33	67
4	33	67
5	33	67
6	32	68
7	32	68
8	32	68
9	31	69
10	31	69
11	31	69
12	31	69
13	31	69
14	30	70
15	30	70
16	29	71
17	29	71
18	29	71
19	29	71
20	29	71
21	29	71
22	30	70
23	31	69
24	31	69
25	31	69
26	31	69
27	31	69
28	32	68
29	32	68
30	32	68

	Rain chance (%)	Snow chance (%)
1	48	0
2	48	0
3	48	0
4	48	0
5	48	0
6	48	0
7	48	0
8	49	0
9	49	0
10	50	0
11	50	0
12	51	0
13	51	0
14	51	0
15	52	0
16	52	0
17	53	1
18	53	1
19	53	1
20	53	1
21	53	2
22	53	2
23	53	2
24	53	3
25	53	3
26	52	3
27	52	3
28	52	4
29	51	4
30	51	4

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

	Avg high (°F)	Avg low (°F)
1	58	50
2	58	50
3	58	50
4	58	49
5	57	49
6	57	49
7	57	49
8	57	48
9	56	48
10	56	48
11	56	48
12	55	47
13	55	47
14	55	47
15	54	46
16	54	46
17	54	46
18	53	45
19	53	45
20	52	44
21	52	44
22	51	44
23	51	43
24	51	43
25	50	42
26	50	42
27	49	42
28	49	41
29	49	41
30	48	40

	Clearer (%)	Cloudier (%)
1	33	67
2	33	67
3	33	67
4	33	67
5	33	67
6	32	68
7	32	68
8	32	68
9	31	69
10	31	69
11	31	69
12	31	69
13	31	69
14	30	70
15	30	70
16	29	71
17	29	71
18	29	71
19	29	71
20	29	71
21	29	71
22	30	70
23	31	69
24	31	69
25	31	69
26	31	69
27	31	69
28	32	68
29	32	68
30	32	68

	Rain chance (%)	Snow chance (%)
1	48	0
2	48	0
3	48	0
4	48	0
5	48	0
6	48	0
7	48	0
8	49	0
9	49	0
10	50	0
11	50	0
12	51	0
13	51	0
14	51	0
15	52	0
16	52	0
17	53	1
18	53	1
19	53	1
20	53	1
21	53	2
22	53	2
23	53	2
24	53	3
25	53	3
26	52	3
27	52	3
28	52	4
29	51	4
30	51	4

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

	Avg high (°F)	Avg low (°F)
1	58	50
2	58	50
3	58	50
4	58	49
5	57	49
6	57	49
7	57	49
8	57	48
9	56	48
10	56	48
11	56	48
12	55	47
13	55	47
14	55	47
15	54	46
16	54	46
17	54	46
18	53	45
19	53	45
20	52	44
21	52	44
22	51	44
23	51	43
24	51	43
25	50	42
26	50	42
27	49	42
28	49	41
29	49	41
30	48	40

	Clearer (%)	Cloudier (%)
1	33	67
2	33	67
3	33	67
4	33	67
5	33	67
6	32	68
7	32	68
8	32	68
9	31	69
10	31	69
11	31	69
12	31	69
13	31	69
14	30	70
15	30	70
16	29	71
17	29	71
18	29	71
19	29	71
20	29	71
21	29	71
22	30	70
23	31	69
24	31	69
25	31	69
26	31	69
27	31	69
28	32	68
29	32	68
30	32	68

	Rain chance (%)	Snow chance (%)
1	48	0
2	48	0
3	48	0
4	48	0
5	48	0
6	48	0
7	48	0
8	49	0
9	49	0
10	50	0
11	50	0
12	51	0
13	51	0
14	51	0
15	52	0
16	52	0
17	53	1
18	53	1
19	53	1
20	53	1
21	53	2
22	53	2
23	53	2
24	53	3
25	53	3
26	52	3
27	52	3
28	52	4
29	51	4
30	51	4

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