Alofi weather in September

In September, Alofi sees average daytime highs of 25°C and overnight lows near 24°C, with 91 mm of rain across 10.1 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 25°C through the month. The sky is clear or mostly clear about 30% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 36 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Alofi's 3rd-clearest and 1st-windiest month. For the whole year in context, see Alofi's year-round climate.

Daytime high
25°
10th warmest
Overnight low
24°
3rd coldest
Rainfall
91 mm
10.1 wet days
Daylight
11 h 54 min
6:17 AM – 6:11 PM
Cloud cover
59%
3rd clearest
Wind
26 km/h
1st windiest
Solar energy
5.23 kWh/m²
Travel score
6.9
out of 10

Alofi is capital of Niue.

Density
13/km²
people per km²

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 25°C through the month.

A typical September day in Alofi reaches about 25°C in the afternoon and slips back to 24°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 26°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)
12423
22423
32423
42423
52523
62523
72523
82523
92523
102523
112524
122524
132524
142524
152524
162524
172524
182524
192524
202524
212524
222524
232524
242524
252524
262524
272524
282524
292524
302524

Alofi 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
Jan27° / 26°24820.4134.9
Feb27° / 26°21319.412.64.7
Mar27° / 26°22121.612.14.8
Apr27° / 26°17716.611.65.4
May26° / 25°14012.611.16.3
Jun25° / 24°749.410.96.8
Jul25° / 24°839.4117.1
Aug24° / 23°789.411.47.1
Sep25° / 24°9110.111.96.9
Oct25° / 24°11612.512.46.4
Nov26° / 25°12614.412.95.8
Dec27° / 25°18717.513.15.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
25149
35149
45248
55347
65347
75347
85347
95446
105446
115545
125545
135446
145446
155347
165347
175248
185248
195149
205149
215149
225050
235050
245050
255050
265149
275050
285149
295149
305149

Chance of precipitation in September

Any precipitation

Alofi gets around 91 mm of rain over 10.1 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 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
132
232
332
433
533
633
733
833
933
1033
1133
1232
1332
1432
1532
1631
1731
1831
1932
2032
2132
2233
2333
2434
2534
2635
2735
2836
2936
3037

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 40% of days. Sticky, muggy-or-worse air turns up on roughly 76% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1113223628
2012223728
3012223729
4011213830
5010203831
6010203931
709194032
808194132
908184133
1007184233
1107174234
1206174334
1306174335
1405164335
1505164336
1605164336
1705164336
1805164336
1905164337
2004164237
2104164237
2204164238
2304164138
2404164039
2504174040
2604173940
2704173941
2804173841
2904173841
3004173842

Wind in September

Winds average 26 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 26 km/h on the calmest days to 27 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202530
Wind speed (km/h)Feels
126breezy
227breezy
327breezy
427breezy
527breezy
627breezy
727breezy
827breezy
927breezy
1027breezy
1127breezy
1227breezy
1327breezy
1427breezy
1527breezy
1627breezy
1726breezy
1826breezy
1926breezy
2026breezy
2126breezy
2226breezy
2326breezy
2426breezy
2526breezy
2626breezy
2726breezy
2826breezy
2926breezy
3026breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 36 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 36 minutes over September. Sunrise moves from 6:31 AM to 6:04 AM, and sunset from 6:08 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:316:08
211.66:306:08
311.76:296:08
411.76:286:09
511.76:276:09
611.76:266:09
711.76:256:09
811.76:256:09
911.86:246:10
1011.86:236:10
1111.86:226:10
1211.86:216:10
1311.86:206:10
1411.96:196:10
1511.96:186:11
1611.96:176:11
1711.96:166:11
1811.96:156:11
1911.96:146:11
2012.06:136:12
2112.06:136:12
2212.06:126:12
2312.06:116:12
2412.06:106:12
2512.16:096:13
2612.16:086:13
2712.16:076:13
2812.16:066:13
2912.16:056:13
3012.26:046:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.23 kWh/m².

For context, solar energy here swings from a low near 3.63 kWh/m² to a high of 6.59 kWh/m² in December across the year — September's 5.23 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.9Bright
34.9Bright
44.9Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.1Bright
105.1Bright
115.1Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.4Bright
225.4Bright
235.4Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.6Bright
295.6Bright
305.6Bright
Planning a trip in September

Is September a good time to visit Alofi?

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

6.9
Sightseeing
3rd-best month of the year
6.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Alofi for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Alofi in September

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

In September, Alofi sees daytime highs around 25°C and nights near 24°C. Worth packing: light clothes, rain gear, sun protection and a windbreaker. About 10 days see rain.

light clothesrain gearsun protectiona windbreaker

Sea temperature near Alofi in September

The nearest coast averages about 25°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 March at about 28°C and coldest in August near 25°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Warm
Feb28Tropical
Mar28Tropical
Apr28Tropical
May27Warm
Jun26Warm
Jul26Warm
Aug25Warm
Sep25Warm
Oct26Warm
Nov27Warm
Dec27Warm

UV index in Alofi 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 Alofi peaks around February 11 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 11UV 16Jul 11UV 7
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar14Extreme
Apr11Extreme
May8Very high
Jun7Very high
Jul7Very high
Aug8Very high
Sep12Extreme
Oct14Extreme
Nov13Extreme
Dec13Extreme
Location & terrain

Where is Alofi?

Alofi sits at 19.1°S, 169.9°W, 51 m above sea level, in Niue. The nearest listed city is Pago Pago, 537 km away.

Topography around Alofi

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

Within 3 km, the terrain around Alofi has only modest variations in elevation — a maximum elevation change of 82 m around an average of 38 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 93 m; within 80 km, only modest variations in elevation — a maximum elevation change of 90 m.

The land around Alofi is covered by trees (56%) and water (36%) within 3 km, water (68%) and trees (31%) within 16 km, and water (95%) within 80 km.

3 km
82 m
16 km
93 m
80 km
90 m
treesgrasslandartificial surfaceswater
September weather nearby: Pago Pago 537 km · Nuku‘alofa 598 km · Apia 613 km · Mata-Utu 926 km · Avarua 1,086 km · Levuka 1,140 km · Labasa 1,171 km · Nasinu 1,224 km

Niue travel facts

Power plugs
Type I
230 V · 50 Hz
Religion
Ekalesia Niue 62%Latter Day Saints 9%Roman Catholic 8%other 8%

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 Alofi (-19.0529°, -169.9196°, elevation 51 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).