Apia weather in September

In September, Apia sees average daytime highs of 27°C and overnight lows near 25°C, with 159 mm of rain across 22 wet days and about 11.9 hours of daylight. It is the 10th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 41% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 42 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Apia's 3rd-clearest and 4th-windiest month. For the whole year in context, see Apia's year-round climate.

Daytime high
27°
10th warmest
Overnight low
25°
2nd coldest
Rainfall
159 mm
22 wet days
Daylight
11 h 54 min
7:24 AM – 7:19 PM
Cloud cover
51%
3rd clearest
Wind
20 km/h
4th windiest
Solar energy
5.63 kWh/m²
Travel score
4.8
out of 10

Apia is capital of Samoa.

Density
326/km²
people per km²
Founded
1850

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical September day in Apia reaches about 27°C in the afternoon and slips back to 25°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 28°C. Set against its neighbours, September runs on par with August and on par with October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12725
22725
32725
42725
52725
62725
72725
82725
92725
102725
112725
122725
132725
142725
152725
162725
172725
182725
192725
202725
212725
222725
232725
242725
252725
262725
272725
282725
292725
302725

Apia weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 26°36027.612.73.7
Feb28° / 26°32724.712.53.8
Mar28° / 26°27127.312.13.8
Apr28° / 26°21825.611.74.0
May28° / 26°20724.611.44.4
Jun27° / 26°14321.611.24.8
Jul27° / 25°1382111.35.1
Aug27° / 25°12121.111.55.1
Sep27° / 25°1592211.94.8
Oct27° / 25°22724.912.34.4
Nov27° / 25°27125.712.64.0
Dec28° / 26°34627.212.83.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 24% of September, with mostly cloudy or overcast conditions the remaining 35%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16832
26931
36931
46931
57030
66931
76931
86931
96931
106931
116931
126931
136832
146832
156733
166634
176535
186535
196337
206238
216238
226139
236040
246040
255941
265941
275842
285842
295842
305644

Chance of precipitation in September

Any precipitation

Apia gets around 159 mm of rain over 22 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 74% and peaks near 77% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
168
268
368
469
569
670
770
871
972
1072
1173
1274
1374
1475
1575
1675
1776
1876
1976
2076
2176
2276
2376
2476
2576
2676
2776
2877
2977
3077

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 91% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1213841
2213841
3212851
4211861
5211861
6110881
719891
819891
918901
1017911
1117911
1216921
1316921
1416921
1505941
1605941
1705941
1805941
1915931
2016921
2116921
2216921
2316921
2416921
2516921
2616921
2716921
2816921
2916921
3016921

Wind in September

Winds average 20 km/h in September.

Across September, daily wind ranges from about 19 km/h on the calmest days to 21 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
121breezy
221breezy
321breezy
421breezy
521breezy
621breezy
721breezy
821breezy
921breezy
1021breezy
1121breezy
1221breezy
1321breezy
1421breezy
1521breezy
1621breezy
1720breezy
1820breezy
1920breezy
2020breezy
2120breezy
2220light breeze
2320light breeze
2420light breeze
2520light breeze
2620light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 42 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over September. Sunrise moves from 7:35 AM to 7:13 AM, and sunset from 7:19 PM to 7:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.77:357:19
211.77:347:19
311.87:337:19
411.87:337:19
511.87:327:19
611.87:317:19
711.87:317:19
811.87:307:19
911.87:297:19
1011.87:287:19
1111.97:287:19
1211.97:277:19
1311.97:267:19
1411.97:257:19
1511.97:247:19
1611.97:247:19
1711.97:237:19
1812.07:227:19
1912.07:217:19
2012.07:217:19
2112.07:207:19
2212.07:197:19
2312.07:187:19
2412.07:187:19
2512.07:177:19
2612.17:167:19
2712.17:157:19
2812.17:157:20
2912.17:147:20
3012.17:137:20

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.63 kWh/m².

For context, solar energy here swings from a low near 4.2 kWh/m² to a high of 5.92 kWh/m² in October across the year — September's 5.63 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in September

Is September a good time to visit Apia?

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

4.8
Sightseeing
3rd-best month of the year
4.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Apia for sightseeing.

What to pack for Apia in September

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

In September, Apia sees daytime highs around 27°C and nights near 25°C. Pack rain gear. Worth having: light clothes, sun protection and a windbreaker. About 22 days see rain.

rain gearlight clothessun protectiona windbreaker

Sea temperature near Apia in September

The nearest coast averages about 28°C 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 13 km away) is warmest in March at about 29°C and coldest in August near 28°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May29Tropical
Jun29Tropical
Jul28Tropical
Aug28Warm
Sep28Warm
Oct28Tropical
Nov29Tropical
Dec29Tropical

UV index in Apia in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Apia peaks around February 14 at about 17 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 14UV 17Jun 19UV 9
UV index (midday)Level
Jan16Extreme
Feb18Extreme
Mar15Extreme
Apr13Extreme
May10Very high
Jun8Very high
Jul9Very high
Aug11Extreme
Sep14Extreme
Oct14Extreme
Nov14Extreme
Dec13Extreme
Location & terrain

Where is Apia?

Apia sits at 13.8°S, 171.8°W, 9 m above sea level, in Samoa. The nearest listed city is Pago Pago, 125 km away.

Topography around Apia

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

Within 3 km, the terrain around Apia has significant variations in elevation — a maximum elevation change of 451 m around an average of 27 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,148 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,824 m.

The land around Apia is covered by water (41%) and trees (33%) within 3 km, water (49%) and trees (45%) within 16 km, and water (83%) within 80 km.

3 km
451 m
16 km
1,148 m
80 km
1,824 m
treesgrasslandartificial surfaceswatermangroves
September weather nearby: Pago Pago 125 km · Mata-Utu 480 km · Alofi 613 km · Nuku‘alofa 890 km · Labasa 995 km · Levuka 1,063 km · Nasinu 1,141 km · Funafuti 1,149 km

Samoa travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type I
230 V · 50 Hz
Prices
≈ 63% of US
price level, 2025
GDP per capita
$5,873
2025
Safe drinking water
63%
of population, 2024
Homicide rate
6.3
per 100k, 2018
Road deaths
13
per 100k/yr, 2019
Income group
Upper middle
World Bank
Religion
Protestant 55%Roman Catholic 19%Church of Jesus Christ 17%other Christian 4%

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 Apia (-13.8333°, -171.7667°, elevation 9 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).