Tonga weather in September

In September, Tonga sees average daytime highs of 26°C and overnight lows near 19°C, with 207 mm of rain across 27.9 wet days and about 12 hours of daylight. It is the 10th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 0% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Tonga's 12th-clearest and 8th-windiest month. For the whole year in context, see Tonga's year-round climate.

Daytime high: 26°; 10th warmest
Overnight low: 19°; 7th coldest
Rainfall: 207 mm; 27.9 wet days
Daylight: 12 hours; 6:11 AM – 6:12 PM
Cloud cover: 85%; 12th clearest
Wind: 6 km/h; 8th windiest
Solar energy: 4.35 kWh/m²
Travel score: 3.7; out of 10

← August Tonga 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 26°C through the month.

A typical September day in Tonga reaches about 26°C in the afternoon and slips back to 19°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 28°C. Set against its neighbours, September runs on par with August and about 1°C cooler 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 (°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 low (°C)	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19

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

How September really feels in Tonga

Once humidity and wind are folded in, September averages 0 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

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Tonga weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 1st-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	31° / 19°	8	2.5	11.7	5.0
Feb	32° / 20°	18	4.8	11.8	4.2
Mar	31° / 20°	70	15.5	12	3.8
Apr	29° / 20°	133	22.4	12.1	3.6
May	28° / 20°	147	25.4	12.2	3.8
Jun	27° / 20°	140	25.7	12.3	4.0
Jul	26° / 19°	142	25.6	12.3	4.2
Aug	25° / 19°	171	26.2	12.2	4.1
Sep	26° / 19°	207	27.9	12	3.7
Oct	27° / 19°	200	28.4	11.9	3.7
Nov	28° / 19°	70	13.9	11.8	5.1
Dec	30° / 19°	10	2.5	11.7	5.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 5% of September, with mostly cloudy or overcast conditions the remaining 94%.

	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 (%)	5	5	5	5	5	5	5	5	5	5	5	5	6	6	6	6	6	6	6	7	7	7	7	7	7	7	6	6	6	6
Cloudier (%)	95	95	95	95	95	95	95	95	95	95	95	95	94	94	94	94	94	94	94	93	93	93	93	93	93	93	94	94	94	94

	Clearer (%)	Cloudier (%)
1	5	95
2	5	95
3	5	95
4	5	95
5	5	95
6	5	95
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	6	94
14	6	94
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	6	94
28	6	94
29	6	94
30	6	94

Chance of precipitation in September

Any precipitation

Tonga gets around 207 mm of rain over 27.9 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 93% and peaks near 94% 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 (%)	90	91	91	91	91	92	92	92	92	93	93	93	93	93	93	93	93	93	93	93	93	93	93	93	93	93	93	93	93	94

	Rain chance (%)
1	90
2	91
3	91
4	91
5	91
6	92
7	92
8	92
9	92
10	93
11	93
12	93
13	93
14	93
15	93
16	93
17	93
18	93
19	93
20	93
21	93
22	93
23	93
24	93
25	93
26	93
27	93
28	93
29	93
30	94

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 100% 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
Humid (%)	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Muggy (%)	99	99	99	99	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Humid (%)	Muggy (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	0	100
9	0	100
10	0	100
11	0	100
12	0	100
13	0	100
14	0	100
15	0	100
16	0	100
17	0	100
18	0	100
19	0	100
20	0	100
21	0	100
22	0	100
23	0	100
24	0	100
25	0	100
26	0	100
27	0	100
28	0	100
29	0	100
30	0	100

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 7 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)	7	7	7	7	7	7	7	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	5	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 (km/h)	Feels
1	7	calm
2	7	calm
3	7	calm
4	7	calm
5	7	calm
6	7	calm
7	7	calm
8	6	calm
9	6	calm
10	6	calm
11	6	calm
12	6	calm
13	6	calm
14	6	calm
15	6	calm
16	6	calm
17	6	calm
18	6	calm
19	6	calm
20	6	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	5	calm
27	5	calm
28	5	calm
29	5	calm
30	5	calm

Sunrise & sunset in September

DaylightNight

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

Days shrink by about 6 minutes over September. Sunrise moves from 6:14 AM to 6:08 AM, and sunset from 6:20 PM to 6:05 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	12.0	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	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	6:14	6:14	6:14	6:13	6:13	6:13	6:13	6:13	6:12	6:12	6:12	6:12	6:11	6:11	6:11	6:11	6:10	6:10	6:10	6:10	6:10	6:09	6:09	6:09	6:09	6:08	6:08	6:08	6:08	6:08
Sunset (PM)	6:20	6:19	6:19	6:18	6:18	6:17	6:17	6:16	6:16	6:15	6:15	6:14	6:14	6:13	6:13	6:12	6:12	6:11	6:11	6:10	6:10	6:09	6:09	6:08	6:08	6:07	6:07	6:06	6:06	6:05

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.1	6:14	6:20
2	12.1	6:14	6:19
3	12.1	6:14	6:19
4	12.1	6:13	6:18
5	12.1	6:13	6:18
6	12.1	6:13	6:17
7	12.1	6:13	6:17
8	12.1	6:13	6:16
9	12.1	6:12	6:16
10	12.1	6:12	6:15
11	12.1	6:12	6:15
12	12.0	6:12	6:14
13	12.0	6:11	6:14
14	12.0	6:11	6:13
15	12.0	6:11	6:13
16	12.0	6:11	6:12
17	12.0	6:10	6:12
18	12.0	6:10	6:11
19	12.0	6:10	6:11
20	12.0	6:10	6:10
21	12.0	6:10	6:10
22	12.0	6:09	6:09
23	12.0	6:09	6:09
24	12.0	6:09	6:08
25	12.0	6:09	6:08
26	12.0	6:08	6:07
27	12.0	6:08	6:07
28	12.0	6:08	6:06
29	12.0	6:08	6:06
30	12.0	6:08	6:05

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.35 kWh/m².

For context, solar energy here swings from a low near 4.24 kWh/m² to a high of 6.02 kWh/m² in February across the year — September's 4.35 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)	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	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	4.4	4.4	4.4	4.4	4.3	4.3
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	4.3	Bright
2	4.3	Bright
3	4.3	Bright
4	4.3	Bright
5	4.3	Bright
6	4.3	Bright
7	4.3	Bright
8	4.3	Bright
9	4.3	Bright
10	4.3	Bright
11	4.3	Bright
12	4.4	Bright
13	4.4	Bright
14	4.4	Bright
15	4.4	Bright
16	4.4	Bright
17	4.4	Bright
18	4.4	Bright
19	4.4	Bright
20	4.4	Bright
21	4.4	Bright
22	4.4	Bright
23	4.4	Bright
24	4.4	Bright
25	4.4	Bright
26	4.4	Bright
27	4.4	Bright
28	4.4	Bright
29	4.3	Bright
30	4.3	Bright

Planning a trip in September

Hazard calendar for Tonga

In seasonPeak

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

Tonga's rainy season runs April–October, when most of the year's rain falls.

Tonga sees seasonal dust haze (February–April), heaviest in February.

Rainy season

Dust

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Tonga?

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

3.7

Sightseeing

10th-best month of the year

3.5

Beach & pool

12th-best month of the year

September is a weaker month for outdoor sightseeing in Tonga.

What to pack for Tonga in September

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

In September, Tonga sees daytime highs around 26°C and nights near 19°C. Pack rain gear. Worth having: light clothes. About 28 days see rain.

rain gearlight clothes

UV index in Tonga in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tonga peaks around April 10 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 9 (very 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)	10	11	14	14	13	11	11	12	13	13	11	9
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high

	UV index (midday)	Level
Jan	10	Very high
Feb	11	Extreme
Mar	14	Extreme
Apr	14	Extreme
May	13	Extreme
Jun	11	Extreme
Jul	11	Extreme
Aug	12	Extreme
Sep	13	Extreme
Oct	13	Extreme
Nov	11	Extreme
Dec	9	Very high

Air quality in Tonga in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Tonga is worst in February — around 109 µg/m³ PM2.5 (unhealthy), about 4.9× the cleanest month (August, 22 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	85	109	71	54	34	28	23	22	24	35	44	71
Level	Unhealthy	Unhealthy	Unhealthy	Poor	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Poor	Unhealthy

	PM2.5 (µg/m³)	Level
Jan	85	Unhealthy
Feb	109	Unhealthy
Mar	71	Unhealthy
Apr	54	Poor
May	34	Moderate
Jun	28	Moderate
Jul	23	Moderate
Aug	22	Moderate
Sep	24	Moderate
Oct	35	Moderate
Nov	44	Poor
Dec	71	Unhealthy

Location & terrain

Where is Tonga?

Tonga sits at 5.0°N, 10.7°E, 809 m above sea level, in Cameroon. The nearest listed city is Bangangté, 27 km away.

Topography around Tonga

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

Within 3 km, the terrain around Tonga has only modest variations in elevation — a maximum elevation change of 178 m around an average of 795 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,087 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,002 m.

The land around Tonga is covered by trees (63%) and grassland (30%) within 3 km, trees (78%) and grassland (20%) within 16 km, and trees (80%) within 80 km.

3 km

178 m

trees 63%

16 km

1,087 m

trees 78%

80 km

2,002 m

trees 80%

treesshrubsgrasslandcroplandartificial surfaces

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

September weather nearby: Bangangté 27 km · Bandjoun 55 km · Foumbot 61 km · Bafang 62 km · Bafia 64 km · Bafoussam 65 km · Kekem 78 km · Melong 84 km

Cameroon travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / E; 220 V · 50 Hz
Prices: ≈ 34% of US; price level, 2025
GDP per capita: $1,972; 2025
Happiness: 5.1 / 10; World Happiness, 2025
Homicide rate: 6.8; per 100k, 2022
Road deaths: 30.2; per 100k/yr, 2019
Income group: Lower middle; World Bank
English: Very low; EF EPI 445
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 Tonga (4.9667°, 10.7°, elevation 809 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. 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	26	19
2	26	19
3	26	19
4	26	19
5	26	19
6	26	19
7	26	19
8	26	19
9	26	19
10	26	19
11	26	19
12	26	19
13	26	19
14	26	19
15	26	19
16	26	19
17	26	19
18	26	19
19	26	19
20	26	19
21	26	19
22	26	19
23	26	19
24	26	19
25	26	19
26	26	19
27	26	19
28	26	19
29	26	19
30	26	19

	Clearer (%)	Cloudier (%)
1	5	95
2	5	95
3	5	95
4	5	95
5	5	95
6	5	95
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	6	94
14	6	94
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	6	94
28	6	94
29	6	94
30	6	94

	Rain chance (%)
1	90
2	91
3	91
4	91
5	91
6	92
7	92
8	92
9	92
10	93
11	93
12	93
13	93
14	93
15	93
16	93
17	93
18	93
19	93
20	93
21	93
22	93
23	93
24	93
25	93
26	93
27	93
28	93
29	93
30	94

	Humid (%)	Muggy (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	0	100
9	0	100
10	0	100
11	0	100
12	0	100
13	0	100
14	0	100
15	0	100
16	0	100
17	0	100
18	0	100
19	0	100
20	0	100
21	0	100
22	0	100
23	0	100
24	0	100
25	0	100
26	0	100
27	0	100
28	0	100
29	0	100
30	0	100

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

	Clearer (%)	Cloudier (%)
1	5	95
2	5	95
3	5	95
4	5	95
5	5	95
6	5	95
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	6	94
14	6	94
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	6	94
28	6	94
29	6	94
30	6	94

	Rain chance (%)
1	90
2	91
3	91
4	91
5	91
6	92
7	92
8	92
9	92
10	93
11	93
12	93
13	93
14	93
15	93
16	93
17	93
18	93
19	93
20	93
21	93
22	93
23	93
24	93
25	93
26	93
27	93
28	93
29	93
30	94

	Humid (%)	Muggy (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	0	100
9	0	100
10	0	100
11	0	100
12	0	100
13	0	100
14	0	100
15	0	100
16	0	100
17	0	100
18	0	100
19	0	100
20	0	100
21	0	100
22	0	100
23	0	100
24	0	100
25	0	100
26	0	100
27	0	100
28	0	100
29	0	100
30	0	100

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

	Clearer (%)	Cloudier (%)
1	5	95
2	5	95
3	5	95
4	5	95
5	5	95
6	5	95
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	6	94
14	6	94
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	6	94
28	6	94
29	6	94
30	6	94

	Rain chance (%)
1	90
2	91
3	91
4	91
5	91
6	92
7	92
8	92
9	92
10	93
11	93
12	93
13	93
14	93
15	93
16	93
17	93
18	93
19	93
20	93
21	93
22	93
23	93
24	93
25	93
26	93
27	93
28	93
29	93
30	94

	Humid (%)	Muggy (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	0	100
9	0	100
10	0	100
11	0	100
12	0	100
13	0	100
14	0	100
15	0	100
16	0	100
17	0	100
18	0	100
19	0	100
20	0	100
21	0	100
22	0	100
23	0	100
24	0	100
25	0	100
26	0	100
27	0	100
28	0	100
29	0	100
30	0	100