Bremerton weather in September

In September, Bremerton sees average daytime highs of 68°F and overnight lows near 56°F, with 2.5 in of rain across 9.7 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 71°F in the first days to 65°F by the end. The sky is clear or mostly clear about 37% 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 Bremerton's 3rd-clearest and 9th-windiest month. For the whole year in context, see Bremerton's year-round climate.

Daytime high: 68°; 3rd warmest
Overnight low: 56°; 10th coldest
Rainfall: 2.5 in; 9.7 wet days
Daylight: 12 h 18 min; 5:55 AM – 6:15 PM
Cloud cover: 50%; 3rd clearest
Wind: 4 mph; 9th windiest
Solar energy: 4.05 kWh/m²
Travel score: 6.5; out of 10

Bremerton is city in Kitsap County, Washington, United States.

Density: 537/km²; people per km²
Founded: 1891

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

← August Bremerton 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 71°F in the first days to 65°F by the end.

A typical September day in Bremerton reaches about 68°F in the afternoon and slips back to 56°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 62°F and 76°F. Set against its neighbours, September runs about 5°F cooler than August and about 9°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)	72	71	71	71	71	71	70	70	70	70	69	69	69	69	69	68	68	68	68	67	67	67	67	66	66	66	65	65	65	64
Avg low (°F)	58	58	58	58	58	58	58	58	57	57	57	57	57	57	56	56	56	56	56	56	55	55	55	55	55	55	54	54	54	54

	Avg high (°F)	Avg low (°F)
1	72	58
2	71	58
3	71	58
4	71	58
5	71	58
6	71	58
7	70	58
8	70	58
9	70	57
10	70	57
11	69	57
12	69	57
13	69	57
14	69	57
15	69	56
16	68	56
17	68	56
18	68	56
19	68	56
20	67	56
21	67	55
22	67	55
23	67	55
24	66	55
25	66	55
26	66	55
27	65	54
28	65	54
29	65	54
30	64	54

Bremerton 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.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	46° / 39°	6.7	17.8	2.8	8.7	0.9
Feb	48° / 40°	4.6	14.6	1.8	9.9	1.4
Mar	51° / 41°	5.3	17	1	11.6	2.1
Apr	56° / 44°	4.0	14.7	0.2	13.3	3.2
May	62° / 50°	2.8	12.2	0	14.9	5.0
Jun	67° / 55°	2.2	9.7	0	15.7	6.1
Jul	73° / 59°	1.3	6.1	0	15.4	7.7
Aug	74° / 60°	1.4	6.1	0	14.1	7.8
Sep	68° / 56°	2.5	9.7	0	12.4	6.5
Oct	59° / 50°	5.1	15.1	0	10.6	4.0
Nov	50° / 44°	7.5	18.2	0.7	9.1	1.9
Dec	45° / 39°	7.4	17.9	2.4	8.3	0.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 46%.

	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 (%)	57	57	58	58	59	59	59	58	58	56	56	55	54	54	53	53	52	52	51	52	51	52	51	52	52	52	52	51	51	50
Cloudier (%)	43	43	42	42	41	41	41	42	42	44	44	45	46	46	47	47	48	48	49	48	49	48	49	48	48	48	48	49	49	50

	Clearer (%)	Cloudier (%)
1	57	43
2	57	43
3	58	42
4	58	42
5	59	41
6	59	41
7	59	41
8	58	42
9	58	42
10	56	44
11	56	44
12	55	45
13	54	46
14	54	46
15	53	47
16	53	47
17	52	48
18	52	48
19	51	49
20	52	48
21	51	49
22	52	48
23	51	49
24	52	48
25	52	48
26	52	48
27	52	48
28	51	49
29	51	49
30	50	50

Chance of precipitation in September

Any precipitation

Bremerton gets around 2.5 in of rain over 9.7 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 33% and peaks near 34% on the wettest days.

	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 (%)	29	30	30	30	30	31	31	31	32	33	33	34	34	34	34	34	34	34	34	34	34	34	34	34	33	33	33	33	33	34

	Rain chance (%)
1	29
2	30
3	30
4	30
5	30
6	31
7	31
8	31
9	32
10	33
11	33
12	34
13	34
14	34
15	34
16	34
17	34
18	34
19	34
20	34
21	34
22	34
23	34
24	34
25	33
26	33
27	33
28	33
29	33
30	34

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 62% 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 (%)	47	48	49	50	51	52	54	55	56	56	57	58	60	60	61	62	64	64	65	66	67	68	69	70	71	72	73	75	76	77
Comfortable (%)	46	45	44	43	42	41	40	39	38	38	37	36	35	35	34	33	32	32	31	30	30	29	28	28	27	26	25	24	23	22
Humid (%)	7	7	7	7	7	7	6	6	6	6	6	6	5	5	5	5	4	4	4	4	3	3	3	2	2	2	2	1	1	1

	Dry (%)	Comfortable (%)	Humid (%)
1	47	46	7
2	48	45	7
3	49	44	7
4	50	43	7
5	51	42	7
6	52	41	7
7	54	40	6
8	55	39	6
9	56	38	6
10	56	38	6
11	57	37	6
12	58	36	6
13	60	35	5
14	60	35	5
15	61	34	5
16	62	33	5
17	64	32	4
18	64	32	4
19	65	31	4
20	66	30	4
21	67	30	3
22	68	29	3
23	69	28	3
24	70	28	2
25	71	27	2
26	72	26	2
27	73	25	2
28	75	24	1
29	76	23	1
30	77	22	1

Wind in September

Winds average 4 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	4	4	4	4	4	4	4	4	4	4	4	4	4	4	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	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	5	calm
28	5	calm
29	5	calm
30	5	calm

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 5:34 AM to 6:14 AM, and sunset from 6:46 PM to 5:45 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)	13.2	13.2	13.1	13.0	13.0	12.9	12.9	12.8	12.7	12.7	12.6	12.6	12.5	12.5	12.4	12.3	12.3	12.2	12.2	12.1	12.0	12.0	11.9	11.9	11.8	11.7	11.7	11.6	11.6	11.5
Sunrise (AM)	5:34	5:35	5:37	5:38	5:39	5:41	5:42	5:44	5:45	5:46	5:48	5:49	5:51	5:52	5:53	5:55	5:56	5:57	5:59	6:00	6:02	6:03	6:04	6:06	6:07	6:09	6:10	6:12	6:13	6:14
Sunset (PM)	6:46	6:44	6:42	6:40	6:38	6:36	6:34	6:32	6:30	6:28	6:26	6:24	6:21	6:19	6:17	6:15	6:13	6:11	6:09	6:06	6:04	6:02	6:00	5:58	5:56	5:54	5:52	5:49	5:47	5:45

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.2	5:34	6:46
2	13.2	5:35	6:44
3	13.1	5:37	6:42
4	13.0	5:38	6:40
5	13.0	5:39	6:38
6	12.9	5:41	6:36
7	12.9	5:42	6:34
8	12.8	5:44	6:32
9	12.7	5:45	6:30
10	12.7	5:46	6:28
11	12.6	5:48	6:26
12	12.6	5:49	6:24
13	12.5	5:51	6:21
14	12.5	5:52	6:19
15	12.4	5:53	6:17
16	12.3	5:55	6:15
17	12.3	5:56	6:13
18	12.2	5:57	6:11
19	12.2	5:59	6:09
20	12.1	6:00	6:06
21	12.0	6:02	6:04
22	12.0	6:03	6:02
23	11.9	6:04	6:00
24	11.9	6:06	5:58
25	11.8	6:07	5:56
26	11.7	6:09	5:54
27	11.7	6:10	5:52
28	11.6	6:12	5:49
29	11.6	6:13	5:47
30	11.5	6:14	5:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.05 kWh/m².

For context, solar energy here swings from a low near 0.87 kWh/m² to a high of 6.22 kWh/m² in July across the year — September's 4.05 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)	4.7	4.7	4.7	4.6	4.6	4.5	4.5	4.4	4.4	4.3	4.3	4.2	4.2	4.1	4.0	4.0	3.9	3.9	3.8	3.8	3.7	3.6	3.6	3.5	3.5	3.4	3.4	3.3	3.3	3.2
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	4.7	Bright
2	4.7	Bright
3	4.7	Bright
4	4.6	Bright
5	4.6	Bright
6	4.5	Bright
7	4.5	Bright
8	4.4	Bright
9	4.4	Bright
10	4.3	Bright
11	4.3	Bright
12	4.2	Bright
13	4.2	Bright
14	4.1	Bright
15	4.0	Bright
16	4.0	Moderate
17	3.9	Moderate
18	3.9	Moderate
19	3.8	Moderate
20	3.8	Moderate
21	3.7	Moderate
22	3.6	Moderate
23	3.6	Moderate
24	3.5	Moderate
25	3.5	Moderate
26	3.4	Moderate
27	3.4	Moderate
28	3.3	Moderate
29	3.3	Moderate
30	3.2	Moderate

Planning a trip in September

Hazard calendar for Bremerton

In seasonPeak

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

Bremerton'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 Bremerton?

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

6.5

Sightseeing

3rd-best month of the year

3.5

Beach & pool

3rd-best month of the year

September is a reasonable time to visit Bremerton for sightseeing.

What to pack for Bremerton in September

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

In September, Bremerton sees daytime highs around 68°F and nights near 56°F. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Bremerton 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 40 mi away) is warmest in August at about 53°F and coldest in February near 46°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)	46	46	47	48	50	52	53	53	53	50	49	47
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°F)	Comfort
Jan	46	Bracing
Feb	46	Bracing
Mar	47	Bracing
Apr	48	Bracing
May	50	Bracing
Jun	52	Bracing
Jul	53	Bracing
Aug	53	Bracing
Sep	53	Bracing
Oct	50	Bracing
Nov	49	Bracing
Dec	47	Bracing

UV index in Bremerton 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 Bremerton peaks around July 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	1	4	5	7	6	8	6	4	3	1	1
Level	Low	Low	Moderate	Moderate	High	High	Very high	High	Moderate	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	1	Low
Mar	4	Moderate
Apr	5	Moderate
May	7	High
Jun	6	High
Jul	8	Very high
Aug	6	High
Sep	4	Moderate
Oct	3	Moderate
Nov	1	Low
Dec	1	Low

Location & terrain

Where is Bremerton?

Bremerton sits at 47.6°N, 122.6°W, 36 ft above sea level, in United States. The nearest listed city is Silverdale, 6.2 mi away.

Topography around Bremerton

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

Within 2 miles, the terrain around Bremerton has only modest variations in elevation — a maximum elevation change of 449 ft around an average of 82 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,778 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,589 ft.

The land around Bremerton is covered by water (40%), trees (28%) and artificial surfaces (28%) within 2 miles, trees (64%) and water (26%) within 10 miles, and trees (71%) within 50 miles.

2 miles

449 ft

water 40%

10 miles

1,778 ft

trees 64%

50 miles

7,589 ft

trees 71%

treesgrasslandartificial surfacesbare terrainwater

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

September weather nearby: Silverdale 6.2 mi · Bainbridge Island 6.8 mi · Seattle 14 mi · Burien 15 mi · Columbia City 17 mi · SeaTac 18 mi · Des Moines 19 mi · Tukwila 19 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 Bremerton (47.5673°, -122.6326°, elevation 36 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	72	58
2	71	58
3	71	58
4	71	58
5	71	58
6	71	58
7	70	58
8	70	58
9	70	57
10	70	57
11	69	57
12	69	57
13	69	57
14	69	57
15	69	56
16	68	56
17	68	56
18	68	56
19	68	56
20	67	56
21	67	55
22	67	55
23	67	55
24	66	55
25	66	55
26	66	55
27	65	54
28	65	54
29	65	54
30	64	54

	Clearer (%)	Cloudier (%)
1	57	43
2	57	43
3	58	42
4	58	42
5	59	41
6	59	41
7	59	41
8	58	42
9	58	42
10	56	44
11	56	44
12	55	45
13	54	46
14	54	46
15	53	47
16	53	47
17	52	48
18	52	48
19	51	49
20	52	48
21	51	49
22	52	48
23	51	49
24	52	48
25	52	48
26	52	48
27	52	48
28	51	49
29	51	49
30	50	50

	Rain chance (%)
1	29
2	30
3	30
4	30
5	30
6	31
7	31
8	31
9	32
10	33
11	33
12	34
13	34
14	34
15	34
16	34
17	34
18	34
19	34
20	34
21	34
22	34
23	34
24	34
25	33
26	33
27	33
28	33
29	33
30	34

	Dry (%)	Comfortable (%)	Humid (%)
1	47	46	7
2	48	45	7
3	49	44	7
4	50	43	7
5	51	42	7
6	52	41	7
7	54	40	6
8	55	39	6
9	56	38	6
10	56	38	6
11	57	37	6
12	58	36	6
13	60	35	5
14	60	35	5
15	61	34	5
16	62	33	5
17	64	32	4
18	64	32	4
19	65	31	4
20	66	30	4
21	67	30	3
22	68	29	3
23	69	28	3
24	70	28	2
25	71	27	2
26	72	26	2
27	73	25	2
28	75	24	1
29	76	23	1
30	77	22	1

	Avg high (°F)	Avg low (°F)
1	72	58
2	71	58
3	71	58
4	71	58
5	71	58
6	71	58
7	70	58
8	70	58
9	70	57
10	70	57
11	69	57
12	69	57
13	69	57
14	69	57
15	69	56
16	68	56
17	68	56
18	68	56
19	68	56
20	67	56
21	67	55
22	67	55
23	67	55
24	66	55
25	66	55
26	66	55
27	65	54
28	65	54
29	65	54
30	64	54

	Clearer (%)	Cloudier (%)
1	57	43
2	57	43
3	58	42
4	58	42
5	59	41
6	59	41
7	59	41
8	58	42
9	58	42
10	56	44
11	56	44
12	55	45
13	54	46
14	54	46
15	53	47
16	53	47
17	52	48
18	52	48
19	51	49
20	52	48
21	51	49
22	52	48
23	51	49
24	52	48
25	52	48
26	52	48
27	52	48
28	51	49
29	51	49
30	50	50

	Rain chance (%)
1	29
2	30
3	30
4	30
5	30
6	31
7	31
8	31
9	32
10	33
11	33
12	34
13	34
14	34
15	34
16	34
17	34
18	34
19	34
20	34
21	34
22	34
23	34
24	34
25	33
26	33
27	33
28	33
29	33
30	34

	Dry (%)	Comfortable (%)	Humid (%)
1	47	46	7
2	48	45	7
3	49	44	7
4	50	43	7
5	51	42	7
6	52	41	7
7	54	40	6
8	55	39	6
9	56	38	6
10	56	38	6
11	57	37	6
12	58	36	6
13	60	35	5
14	60	35	5
15	61	34	5
16	62	33	5
17	64	32	4
18	64	32	4
19	65	31	4
20	66	30	4
21	67	30	3
22	68	29	3
23	69	28	3
24	70	28	2
25	71	27	2
26	72	26	2
27	73	25	2
28	75	24	1
29	76	23	1
30	77	22	1

	Avg high (°F)	Avg low (°F)
1	72	58
2	71	58
3	71	58
4	71	58
5	71	58
6	71	58
7	70	58
8	70	58
9	70	57
10	70	57
11	69	57
12	69	57
13	69	57
14	69	57
15	69	56
16	68	56
17	68	56
18	68	56
19	68	56
20	67	56
21	67	55
22	67	55
23	67	55
24	66	55
25	66	55
26	66	55
27	65	54
28	65	54
29	65	54
30	64	54

	Clearer (%)	Cloudier (%)
1	57	43
2	57	43
3	58	42
4	58	42
5	59	41
6	59	41
7	59	41
8	58	42
9	58	42
10	56	44
11	56	44
12	55	45
13	54	46
14	54	46
15	53	47
16	53	47
17	52	48
18	52	48
19	51	49
20	52	48
21	51	49
22	52	48
23	51	49
24	52	48
25	52	48
26	52	48
27	52	48
28	51	49
29	51	49
30	50	50

	Rain chance (%)
1	29
2	30
3	30
4	30
5	30
6	31
7	31
8	31
9	32
10	33
11	33
12	34
13	34
14	34
15	34
16	34
17	34
18	34
19	34
20	34
21	34
22	34
23	34
24	34
25	33
26	33
27	33
28	33
29	33
30	34

	Dry (%)	Comfortable (%)	Humid (%)
1	47	46	7
2	48	45	7
3	49	44	7
4	50	43	7
5	51	42	7
6	52	41	7
7	54	40	6
8	55	39	6
9	56	38	6
10	56	38	6
11	57	37	6
12	58	36	6
13	60	35	5
14	60	35	5
15	61	34	5
16	62	33	5
17	64	32	4
18	64	32	4
19	65	31	4
20	66	30	4
21	67	30	3
22	68	29	3
23	69	28	3
24	70	28	2
25	71	27	2
26	72	26	2
27	73	25	2
28	75	24	1
29	76	23	1
30	77	22	1