Adamstown weather in September

In September, Adamstown sees average daytime highs of 21°C and overnight lows near 20°C, with 106 mm of rain across 9.7 wet days and about 11.8 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 21% of the time in September, and the air most often feels humid.

Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Adamstown's 8th-clearest and 4th-windiest month. For the whole year in context, see Adamstown's year-round climate.

Daytime high: 21°; 12th warmest
Overnight low: 20°; 2nd coldest
Rainfall: 106 mm; 9.7 wet days
Daylight: 11 h 54 min; 6:39 AM – 6:30 PM
Cloud cover: 66%; 8th clearest
Wind: 24 km/h; 4th windiest
Solar energy: 4.81 kWh/m²
Travel score: 6.4; out of 10

Adamstown is capital and only settlement on the Pitcairn Islands.

Density: 10/km²; people per km²
Founded: 1790

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

← August Adamstown 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 21°C through the month.

A typical September day in Adamstown reaches about 21°C in the afternoon and slips back to 20°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 23°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)	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	22	22	22	22	22	22	22
Avg low (°C)	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20

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

Adamstown weather by month

How September compares with the rest of the year at a glance. September is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	25° / 24°	117	12.9	13.4	6.4
Feb	26° / 24°	109	12.8	12.9	6.2
Mar	26° / 24°	109	12.2	12.2	6.5
Apr	25° / 24°	130	12.9	11.4	6.3
May	24° / 22°	107	9.8	10.8	6.8
Jun	23° / 21°	121	10.3	10.5	6.5
Jul	22° / 20°	102	10.1	10.6	6.5
Aug	21° / 20°	113	10.2	11.1	6.5
Sep	21° / 20°	106	9.7	11.8	6.4
Oct	22° / 21°	134	11	12.6	6.3
Nov	23° / 22°	108	9.7	13.2	6.6
Dec	24° / 23°	155	12.7	13.5	6.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 59%. Skies tend to cloud over as the month goes on.

	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 (%)	45	45	43	43	42	42	42	42	41	41	42	42	41	40	39	39	39	39	39	38	38	39	39	40	40	40	40	40	40	40
Cloudier (%)	55	55	57	57	58	58	58	58	59	59	58	58	59	60	61	61	61	61	61	62	62	61	61	60	60	60	60	60	60	60

	Clearer (%)	Cloudier (%)
1	45	55
2	45	55
3	43	57
4	43	57
5	42	58
6	42	58
7	42	58
8	42	58
9	41	59
10	41	59
11	42	58
12	42	58
13	41	59
14	40	60
15	39	61
16	39	61
17	39	61
18	39	61
19	39	61
20	38	62
21	38	62
22	39	61
23	39	61
24	40	60
25	40	60
26	40	60
27	40	60
28	40	60
29	40	60
30	40	60

Chance of precipitation in September

Any precipitation

Adamstown gets around 106 mm 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 32% and peaks near 33% 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 (%)	31	31	31	32	32	32	32	31	31	32	32	32	32	32	32	32	32	32	32	32	33	33	33	33	33	33	33	33	33	33

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

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 28% 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
Dry (%)	21	22	22	22	22	22	22	22	22	22	22	22	21	21	21	20	19	19	18	18	17	17	17	16	16	16	16	16	16	16
Comfortable (%)	26	26	26	26	26	26	26	25	25	25	24	24	24	23	23	23	23	23	23	23	22	22	22	22	22	22	22	21	21	20
Humid (%)	28	28	27	27	26	26	26	26	26	26	27	27	27	28	28	29	29	29	30	30	31	31	32	32	32	33	33	34	34	34
Muggy (%)	25	25	25	25	25	26	26	26	27	27	27	27	28	28	28	28	29	29	29	29	29	30	29	29	29	29	29	29	29	29

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

Wind in September

Winds average 24 km/h in September.

Across September, daily wind ranges from about 24 km/h on the calmest days to 25 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)	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24
Feels	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy

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

Sunrise & sunset in September

DaylightNight

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

Days grow by about 42 minutes over September. Sunrise moves from 6:56 AM to 6:24 AM, and sunset from 6:25 PM to 6:36 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)	11.5	11.5	11.5	11.6	11.6	11.6	11.6	11.7	11.7	11.7	11.7	11.8	11.8	11.8	11.8	11.9	11.9	11.9	11.9	12.0	12.0	12.0	12.0	12.1	12.1	12.1	12.1	12.2	12.2	12.2
Sunrise (AM)	6:56	6:55	6:53	6:52	6:51	6:50	6:49	6:48	6:47	6:46	6:45	6:44	6:42	6:41	6:40	6:39	6:38	6:37	6:36	6:35	6:33	6:32	6:31	6:30	6:29	6:28	6:27	6:26	6:25	6:24
Sunset (PM)	6:25	6:25	6:25	6:26	6:26	6:27	6:27	6:27	6:28	6:28	6:28	6:29	6:29	6:30	6:30	6:30	6:31	6:31	6:32	6:32	6:32	6:33	6:33	6:33	6:34	6:34	6:35	6:35	6:36	6:36

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.5	6:56	6:25
2	11.5	6:55	6:25
3	11.5	6:53	6:25
4	11.6	6:52	6:26
5	11.6	6:51	6:26
6	11.6	6:50	6:27
7	11.6	6:49	6:27
8	11.7	6:48	6:27
9	11.7	6:47	6:28
10	11.7	6:46	6:28
11	11.7	6:45	6:28
12	11.8	6:44	6:29
13	11.8	6:42	6:29
14	11.8	6:41	6:30
15	11.8	6:40	6:30
16	11.9	6:39	6:30
17	11.9	6:38	6:31
18	11.9	6:37	6:31
19	11.9	6:36	6:32
20	12.0	6:35	6:32
21	12.0	6:33	6:32
22	12.0	6:32	6:33
23	12.0	6:31	6:33
24	12.1	6:30	6:33
25	12.1	6:29	6:34
26	12.1	6:28	6:34
27	12.1	6:27	6:35
28	12.2	6:26	6:35
29	12.2	6:25	6:36
30	12.2	6:24	6:36

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.81 kWh/m².

For context, solar energy here swings from a low near 3.03 kWh/m² to a high of 6.84 kWh/m² in January across the year — September's 4.81 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)	4.4	4.4	4.5	4.5	4.5	4.5	4.5	4.6	4.6	4.6	4.7	4.7	4.7	4.7	4.8	4.8	4.8	4.9	4.9	5.0	5.0	5.0	5.1	5.1	5.2	5.2	5.2	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	4.4	Bright
2	4.4	Bright
3	4.5	Bright
4	4.5	Bright
5	4.5	Bright
6	4.5	Bright
7	4.5	Bright
8	4.6	Bright
9	4.6	Bright
10	4.6	Bright
11	4.7	Bright
12	4.7	Bright
13	4.7	Bright
14	4.7	Bright
15	4.8	Bright
16	4.8	Bright
17	4.8	Bright
18	4.9	Bright
19	4.9	Bright
20	5.0	Bright
21	5.0	Bright
22	5.0	Bright
23	5.1	Bright
24	5.1	Bright
25	5.2	Bright
26	5.2	Bright
27	5.2	Bright
28	5.3	Bright
29	5.3	Bright
30	5.3	Bright

Planning a trip in September

Is September a good time to visit Adamstown?

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

6.4

Sightseeing

7th-best month of the year

4.1

Beach & pool

12th-best month of the year

September is a reasonable time to visit Adamstown for sightseeing.

What to pack for Adamstown in September

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

In September, Adamstown sees daytime highs around 21°C and nights near 20°C. Worth packing: rain gear, sun protection and a windbreaker. About 10 days see rain.

rain gearsun protectiona windbreaker

Sea temperature near Adamstown in September

The nearest coast averages about 22°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 February at about 27°C and coldest in August near 22°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)	26	27	27	26	25	24	23	22	22	23	24	25
Comfort	Warm	Warm	Warm	Warm	Warm	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Warm

	Sea temperature (°C)	Comfort
Jan	26	Warm
Feb	27	Warm
Mar	27	Warm
Apr	26	Warm
May	25	Warm
Jun	24	Refreshing
Jul	23	Refreshing
Aug	22	Refreshing
Sep	22	Refreshing
Oct	23	Refreshing
Nov	24	Refreshing
Dec	25	Warm

UV index in Adamstown in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Adamstown peaks around February 10 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 5 (high).

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)	14	15	13	8	6	5	5	7	9	12	14	12
Level	Extreme	Extreme	Extreme	Very high	High	Moderate	High	High	Very high	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	15	Extreme
Mar	13	Extreme
Apr	8	Very high
May	6	High
Jun	5	Moderate
Jul	5	High
Aug	7	High
Sep	9	Very high
Oct	12	Extreme
Nov	14	Extreme
Dec	12	Extreme

Location & terrain

Where is Adamstown?

Adamstown sits at 25.1°S, 130.1°W, 67 m above sea level, in Pitcairn. The nearest listed city is Punaauia, 2,179 km away.

Topography around Adamstown

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

Within 3 km, the terrain around Adamstown has significant variations in elevation — a maximum elevation change of 318 m around an average of 17 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 318 m; within 80 km, significant variations in elevation — a maximum elevation change of 302 m.

The land around Adamstown is covered by water (88%) within 3 km, water (100%) within 16 km, and water (100%) within 80 km.

3 km

318 m

water 88%

16 km

318 m

water 100%

80 km

302 m

water 100%

treesgrasslandwater

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

September weather nearby: Punaauia 2,179 km · Papeete 2,181 km · Faaa 2,183 km · Moorea 2,205 km · Bora Bora 2,438 km · Avarua 3,058 km · Alofi 4,143 km · Pago Pago 4,398 km

Pitcairn travel facts

Power plugs: Type I; 230 V · 50 Hz
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 Adamstown (-25.066°, -130.1015°, elevation 67 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. 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	21	20
2	21	20
3	21	20
4	21	20
5	21	20
6	21	20
7	21	20
8	21	20
9	21	20
10	21	20
11	21	20
12	21	20
13	21	20
14	21	20
15	21	20
16	21	20
17	21	20
18	21	20
19	21	20
20	21	20
21	21	20
22	21	20
23	21	20
24	22	20
25	22	20
26	22	20
27	22	20
28	22	20
29	22	20
30	22	20

	Clearer (%)	Cloudier (%)
1	45	55
2	45	55
3	43	57
4	43	57
5	42	58
6	42	58
7	42	58
8	42	58
9	41	59
10	41	59
11	42	58
12	42	58
13	41	59
14	40	60
15	39	61
16	39	61
17	39	61
18	39	61
19	39	61
20	38	62
21	38	62
22	39	61
23	39	61
24	40	60
25	40	60
26	40	60
27	40	60
28	40	60
29	40	60
30	40	60

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

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

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

	Clearer (%)	Cloudier (%)
1	45	55
2	45	55
3	43	57
4	43	57
5	42	58
6	42	58
7	42	58
8	42	58
9	41	59
10	41	59
11	42	58
12	42	58
13	41	59
14	40	60
15	39	61
16	39	61
17	39	61
18	39	61
19	39	61
20	38	62
21	38	62
22	39	61
23	39	61
24	40	60
25	40	60
26	40	60
27	40	60
28	40	60
29	40	60
30	40	60

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

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

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

	Clearer (%)	Cloudier (%)
1	45	55
2	45	55
3	43	57
4	43	57
5	42	58
6	42	58
7	42	58
8	42	58
9	41	59
10	41	59
11	42	58
12	42	58
13	41	59
14	40	60
15	39	61
16	39	61
17	39	61
18	39	61
19	39	61
20	38	62
21	38	62
22	39	61
23	39	61
24	40	60
25	40	60
26	40	60
27	40	60
28	40	60
29	40	60
30	40	60

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

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