Anacortes weather in September

In September, Anacortes sees average daytime highs of 64°F and overnight lows near 55°F, with 2.8 in of rain across 8.4 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 66°F in the first days to 61°F by the end. The sky is clear or mostly clear about 43% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Anacortes's 3rd-clearest and 10th-windiest month. For the whole year in context, see Anacortes's year-round climate.

Daytime high
64°
3rd warmest
Overnight low
55°
10th coldest
Rainfall
2.8 in
8.4 wet days
Daylight
12 h 18 min
5:54 AM – 6:15 PM
Cloud cover
48%
3rd clearest
Wind
5 mph
10th windiest
Solar energy
4.1 kWh/m²
Travel score
6.0
out of 10

Anacortes is city in Skagit County, Washington, United States.

Density
450/km²
people per km²
Founded
1891

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 66°F in the first days to 61°F by the end.

A typical September day in Anacortes reaches about 64°F in the afternoon and slips back to 55°F overnight — a 9°F spread between the day's warmth and the night's chill. On most days the high lands between 58°F and 69°F. Set against its neighbours, September runs about 4°F cooler than August and about 8°F warmer than October.

40°50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
16656
26656
36656
46556
56556
66556
76556
86556
96556
106555
116455
126455
136455
146455
156455
166455
176354
186354
196354
206354
216254
226253
236253
246253
256253
266153
276153
286152
296152
306052

How September really feels in Anacortes

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
0
heat index over the day's high
Days feeling ≤ 32°F
0
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.

Anacortes weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan44° / 38°7.218.33.18.60.7
Feb46° / 38°4.714.62.59.91.1
Mar49° / 40°5.718.31.411.61.7
Apr53° / 44°4.114.60.213.42.7
May58° / 49°3.010.30154.3
Jun62° / 53°2.28.4015.85.5
Jul67° / 57°1.04.3015.57.3
Aug68° / 58°1.44.6014.17.4
Sep64° / 55°2.88.4012.46.0
Oct56° / 48°5.614.2010.63.4
Nov49° / 42°8.218.40.991.5
Dec44° / 38°7.1182.98.20.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16337
26337
36337
46436
56436
66436
76436
86436
96337
106238
116238
126139
136040
146040
155842
165842
175842
185842
195743
205743
215743
225644
235644
245644
255743
265644
275644
285545
295545
305446

Chance of precipitation in September

Any precipitation

Anacortes gets around 2.8 in of rain over 8.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 28% and peaks near 32% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
122
222
323
423
524
624
725
825
926
1027
1128
1229
1329
1430
1530
1631
1731
1831
1931
2031
2131
2231
2331
2431
2531
2631
2731
2831
2931
3032

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 69% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
154442
255432
356422
457412
558402
659392
759392
860382
961372
1062362
1163352
1264342
1365332
1467321
1568311
1669301
1770291
1871281
1972271
2073261
2176240
2277230
2378220
2479210
2581190
2682180
2783170
2885150
2986140
3087130

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.

0246810151015202530
Wind speed (mph)Feels
15calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 12 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 102 minutes over September. Sunrise moves from 5:33 AM to 6:15 AM, and sunset from 6:48 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:336:48
213.25:346:46
313.15:366:43
413.15:376:41
513.05:386:39
613.05:406:37
712.95:416:35
812.85:436:33
912.85:446:31
1012.75:466:28
1112.75:476:26
1212.65:496:24
1312.55:506:22
1412.55:516:20
1512.45:536:17
1612.35:546:15
1712.35:566:13
1812.25:576:11
1912.25:596:09
2012.16:006:06
2112.06:026:04
2212.06:036:02
2311.96:046:00
2411.96:065:58
2511.86:075:56
2611.76:095:53
2711.76:105:51
2811.66:125:49
2911.66:135:47
3011.56:155:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.1 kWh/m².

For context, solar energy here swings from a low near 0.86 kWh/m² to a high of 6.43 kWh/m² in July across the year — September's 4.1 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.1Bright
164.0Bright
174.0Moderate
183.9Moderate
193.9Moderate
203.8Moderate
213.8Moderate
223.7Moderate
233.6Moderate
243.6Moderate
253.5Moderate
263.5Moderate
273.4Moderate
283.4Moderate
293.3Moderate
303.3Moderate
Planning a trip in September

Hazard calendar for Anacortes

In seasonPeak

None of Anacortes's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Anacortes's rainy season runs October–April, 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 Anacortes?

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

6.0
Sightseeing
3rd-best month of the year
1.7
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Anacortes for sightseeing.

What to pack for Anacortes in September

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

In September, Anacortes sees daytime highs around 64°F and nights near 55°F. Worth packing: rain gear. About 8 days see rain.

rain gear

Sea temperature near Anacortes in September

The nearest coast averages about 53°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 16 mi away) is warmest in August at about 54°F and coldest in February near 46°F.

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

45°50°55°JanFebMarAprMayJunJulAugSepOctNovDecbracing
Sea temperature (°F)Comfort
Jan46Bracing
Feb46Bracing
Mar47Bracing
Apr48Bracing
May50Bracing
Jun52Bracing
Jul53Bracing
Aug54Bracing
Sep53Bracing
Oct50Bracing
Nov49Bracing
Dec47Bracing

UV index in Anacortes 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 Anacortes peaks around July 17 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 18 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 17UV 8Dec 18UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar4Moderate
Apr5Moderate
May7High
Jun6High
Jul8Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Anacortes in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Anacortes is worst in September — around 18 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (December, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1018 µg/m³Dec 176 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb9Good
Mar12Good
Apr12Good
May12Good
Jun11Good
Jul11Good
Aug18Moderate
Sep18Moderate
Oct12Good
Nov7Good
Dec6Good
Location & terrain

Where is Anacortes?

Anacortes sits at 48.5°N, 122.6°W, 23 ft above sea level, in United States. The nearest listed city is Mount Vernon, 14 mi away.

Topography around Anacortes

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

Within 2 miles, the terrain around Anacortes has only modest variations in elevation — a maximum elevation change of 558 ft around an average of 75 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,581 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,758 ft.

The land around Anacortes is covered by water (51%) and trees (25%) within 2 miles, water (61%) and trees (22%) within 10 miles, and trees (49%) and water (35%) within 50 miles.

2 miles
558 ft
10 miles
1,581 ft
50 miles
10,758 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Mount Vernon 14 mi · Oak Harbor 15 mi · Bellingham 18 mi · Arlington 31 mi · Oak Bay 32 mi · Gordon Head 32 mi · Victoria 34 mi · Saanich 35 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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Anacortes (48.5126°, -122.6127°, elevation 23 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).