Koror weather in September

In September, Koror sees average daytime highs of 28°C and overnight lows near 26°C, with 270 mm of rain across 24.2 wet days and about 12 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 12% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 06 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Koror's 9th-clearest and 7th-windiest month. For the whole year in context, see Koror's year-round climate.

Daytime high: 28°; 6th warmest
Overnight low: 26°; 8th coldest
Rainfall: 270 mm; 24.2 wet days
Daylight: 12 hours; 5:55 AM – 5:58 PM
Cloud cover: 78%; 9th clearest
Wind: 18 km/h; 7th windiest
Solar energy: 5.37 kWh/m²
Travel score: 3.9; out of 10

Koror is city and former capital of Palau.

Founded: 1866

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

← August Koror 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

Day-to-day highs hold fairly steady near 28°C through the month.

A typical September day in Koror reaches about 28°C in the afternoon and slips back to 26°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, September runs on par with August and on par with 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 (°C)	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28
Avg low (°C)	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26

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

How September really feels in Koror

Once humidity and wind are folded in, September averages 22 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Koror weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 6th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 26°	239	22.9	11.6	4.4
Feb	28° / 26°	218	19.2	11.8	4.7
Mar	28° / 26°	158	19.5	12	4.9
Apr	28° / 26°	186	21.3	12.2	4.5
May	28° / 26°	291	26.7	12.3	3.6
Jun	28° / 26°	347	27.8	12.4	3.4
Jul	28° / 26°	337	26.8	12.4	3.7
Aug	28° / 26°	270	25.1	12.2	4.0
Sep	28° / 26°	270	24.2	12	3.9
Oct	28° / 26°	258	25	11.8	3.8
Nov	28° / 26°	267	26	11.7	3.6
Dec	28° / 26°	281	26.6	11.6	3.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 77%.

	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 (%)	25	24	24	24	23	23	23	22	22	21	21	21	20	20	19	20	21	21	22	22	23	23	23	24	24	24	25	25	26	26
Cloudier (%)	75	76	76	76	77	77	77	78	78	79	79	79	80	80	81	80	79	79	78	78	77	77	77	76	76	76	75	75	74	74

	Clearer (%)	Cloudier (%)
1	25	75
2	24	76
3	24	76
4	24	76
5	23	77
6	23	77
7	23	77
8	22	78
9	22	78
10	21	79
11	21	79
12	21	79
13	20	80
14	20	80
15	19	81
16	20	80
17	21	79
18	21	79
19	22	78
20	22	78
21	23	77
22	23	77
23	23	77
24	24	76
25	24	76
26	24	76
27	25	75
28	25	75
29	26	74
30	26	74

Chance of precipitation in September

Any precipitation

Koror gets around 270 mm of rain over 24.2 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 80% and peaks near 82% 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 (%)	81	82	82	82	82	82	81	81	81	80	80	80	79	79	79	79	79	79	79	79	79	80	80	80	81	81	81	81	81	82

	Rain chance (%)
1	81
2	82
3	82
4	82
5	82
6	82
7	81
8	81
9	81
10	80
11	80
12	80
13	79
14	79
15	79
16	79
17	79
18	79
19	79
20	79
21	79
22	80
23	80
24	80
25	81
26	81
27	81
28	81
29	81
30	82

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 50% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

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

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

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 18 km/h 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 (km/h)	17	17	17	17	17	17	17	17	17	17	17	17	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 06 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over September. Sunrise moves from 5:58 AM to 5:53 AM, and sunset from 6:06 PM to 5:50 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)	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9
Sunrise (AM)	5:58	5:57	5:57	5:57	5:57	5:57	5:57	5:57	5:56	5:56	5:56	5:56	5:56	5:56	5:55	5:55	5:55	5:55	5:55	5:55	5:54	5:54	5:54	5:54	5:54	5:54	5:54	5:53	5:53	5:53
Sunset (PM)	6:06	6:06	6:05	6:04	6:04	6:03	6:03	6:02	6:02	6:01	6:01	6:00	5:59	5:59	5:58	5:58	5:57	5:56	5:56	5:55	5:55	5:54	5:54	5:53	5:52	5:52	5:51	5:51	5:50	5:50

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.1	5:58	6:06
2	12.1	5:57	6:06
3	12.1	5:57	6:05
4	12.1	5:57	6:04
5	12.1	5:57	6:04
6	12.1	5:57	6:03
7	12.1	5:57	6:03
8	12.1	5:57	6:02
9	12.1	5:56	6:02
10	12.1	5:56	6:01
11	12.1	5:56	6:01
12	12.1	5:56	6:00
13	12.1	5:56	5:59
14	12.1	5:56	5:59
15	12.0	5:55	5:58
16	12.0	5:55	5:58
17	12.0	5:55	5:57
18	12.0	5:55	5:56
19	12.0	5:55	5:56
20	12.0	5:55	5:55
21	12.0	5:54	5:55
22	12.0	5:54	5:54
23	12.0	5:54	5:54
24	12.0	5:54	5:53
25	12.0	5:54	5:52
26	12.0	5:54	5:52
27	12.0	5:54	5:51
28	12.0	5:53	5:51
29	11.9	5:53	5:50
30	11.9	5:53	5:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.37 kWh/m².

For context, solar energy here swings from a low near 4.67 kWh/m² to a high of 5.97 kWh/m² in April across the year — September's 5.37 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)	5.5	5.5	5.5	5.5	5.5	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.3	5.3	5.3	5.3	5.3	5.3	5.3
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.5	Bright
2	5.5	Bright
3	5.5	Bright
4	5.5	Bright
5	5.5	Bright
6	5.4	Bright
7	5.4	Bright
8	5.4	Bright
9	5.4	Bright
10	5.4	Bright
11	5.4	Bright
12	5.4	Bright
13	5.4	Bright
14	5.4	Bright
15	5.4	Bright
16	5.4	Bright
17	5.4	Bright
18	5.4	Bright
19	5.4	Bright
20	5.4	Bright
21	5.4	Bright
22	5.4	Bright
23	5.4	Bright
24	5.3	Bright
25	5.3	Bright
26	5.3	Bright
27	5.3	Bright
28	5.3	Bright
29	5.3	Bright
30	5.3	Bright

Planning a trip in September

Hazard calendar for Koror

In seasonPeak

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

Koror sits in the Pacific typhoon belt; the season peaks July–October.

Pacific typhoon

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Koror?

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

3.9

Sightseeing

6th-best month of the year

4.4

Beach & pool

6th-best month of the year

September is a weaker month for outdoor sightseeing in Koror.

What to pack for Koror in September

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

In September, Koror sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Koror in September

The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in June at about 30°C and coldest in February near 28°C.

The water stays above 20°C all year — warm enough for a swim any month.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	28	28	28	29	29	30	29	29	29	29	29	29
Comfort	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical

	Sea temperature (°C)	Comfort
Jan	28	Tropical
Feb	28	Tropical
Mar	28	Tropical
Apr	29	Tropical
May	29	Tropical
Jun	30	Tropical
Jul	29	Tropical
Aug	29	Tropical
Sep	29	Tropical
Oct	29	Tropical
Nov	29	Tropical
Dec	29	Tropical

UV index in Koror in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Koror peaks around March 24 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 11 (extreme).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	12	14	15	15	14	12	13	14	12	14	11	11
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	12	Extreme
Feb	14	Extreme
Mar	15	Extreme
Apr	15	Extreme
May	14	Extreme
Jun	12	Extreme
Jul	13	Extreme
Aug	14	Extreme
Sep	12	Extreme
Oct	14	Extreme
Nov	11	Extreme
Dec	11	Extreme

Location & terrain

Where is Koror?

Koror sits at 7.3°N, 134.5°E, 0 m above sea level, in Palau. The nearest listed city is Ngerulmud, 24 km away.

Topography around Koror

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Koror.

Within 3 km, the terrain around Koror has only modest variations in elevation — a maximum elevation change of 155 m around an average of 9 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 205 m; within 80 km, only modest variations in elevation — a maximum elevation change of 224 m.

The land around Koror is covered by water (67%) and trees (22%) within 3 km, water (79%) within 16 km, and water (96%) within 80 km.

3 km

155 m

water 67%

16 km

205 m

water 79%

80 km

224 m

water 96%

treesgrasslandartificial surfaceswatermangroves

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

September weather nearby: Ngerulmud 24 km · Manay 875 km · Daruba 903 km · Hinatuan 904 km · Bislig 904 km · Mati 912 km · Manokwari 913 km · Tagbina 923 km

Palau travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 85% of US; price level, 2025
GDP per capita: $19,532; 2025
Safe drinking water: 91%; of population, 2024
Homicide rate: 11.2; per 100k, 2018
Road deaths: 4.8; per 100k/yr, 2013
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 Koror (7.3398°, 134.4733°, elevation 0 m), 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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 (°C)	Avg low (°C)
1	28	26
2	28	26
3	28	26
4	28	26
5	28	26
6	28	26
7	28	26
8	28	26
9	28	26
10	28	26
11	28	26
12	28	26
13	28	26
14	28	26
15	28	26
16	28	26
17	28	26
18	28	26
19	28	26
20	28	26
21	28	26
22	28	26
23	28	26
24	28	26
25	28	26
26	28	26
27	28	26
28	28	26
29	28	26
30	28	26

	Clearer (%)	Cloudier (%)
1	25	75
2	24	76
3	24	76
4	24	76
5	23	77
6	23	77
7	23	77
8	22	78
9	22	78
10	21	79
11	21	79
12	21	79
13	20	80
14	20	80
15	19	81
16	20	80
17	21	79
18	21	79
19	22	78
20	22	78
21	23	77
22	23	77
23	23	77
24	24	76
25	24	76
26	24	76
27	25	75
28	25	75
29	26	74
30	26	74

	Rain chance (%)
1	81
2	82
3	82
4	82
5	82
6	82
7	81
8	81
9	81
10	80
11	80
12	80
13	79
14	79
15	79
16	79
17	79
18	79
19	79
20	79
21	79
22	80
23	80
24	80
25	81
26	81
27	81
28	81
29	81
30	82

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

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

	Clearer (%)	Cloudier (%)
1	25	75
2	24	76
3	24	76
4	24	76
5	23	77
6	23	77
7	23	77
8	22	78
9	22	78
10	21	79
11	21	79
12	21	79
13	20	80
14	20	80
15	19	81
16	20	80
17	21	79
18	21	79
19	22	78
20	22	78
21	23	77
22	23	77
23	23	77
24	24	76
25	24	76
26	24	76
27	25	75
28	25	75
29	26	74
30	26	74

	Rain chance (%)
1	81
2	82
3	82
4	82
5	82
6	82
7	81
8	81
9	81
10	80
11	80
12	80
13	79
14	79
15	79
16	79
17	79
18	79
19	79
20	79
21	79
22	80
23	80
24	80
25	81
26	81
27	81
28	81
29	81
30	82

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

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

	Clearer (%)	Cloudier (%)
1	25	75
2	24	76
3	24	76
4	24	76
5	23	77
6	23	77
7	23	77
8	22	78
9	22	78
10	21	79
11	21	79
12	21	79
13	20	80
14	20	80
15	19	81
16	20	80
17	21	79
18	21	79
19	22	78
20	22	78
21	23	77
22	23	77
23	23	77
24	24	76
25	24	76
26	24	76
27	25	75
28	25	75
29	26	74
30	26	74

	Rain chance (%)
1	81
2	82
3	82
4	82
5	82
6	82
7	81
8	81
9	81
10	80
11	80
12	80
13	79
14	79
15	79
16	79
17	79
18	79
19	79
20	79
21	79
22	80
23	80
24	80
25	81
26	81
27	81
28	81
29	81
30	82

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