Tonga weather in May

In May, Tonga sees average daytime highs of 28°C and overnight lows near 20°C, with 147 mm of rain across 25.4 wet days and about 12.2 hours of daylight. It is the 7th-warmest and 4th-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 3% of the time in May, and the air most often feels muggy.

Daylight stretches from about 12 h 12 min at the start of May to 12 h 18 min by month's end. Set against the rest of the year, May is Tonga's 7th-clearest and 11th-windiest month. For the whole year in context, see Tonga's year-round climate.

Daytime high: 28°; 7th warmest
Overnight low: 20°; 10th coldest
Rainfall: 147 mm; 25.4 wet days
Daylight: 12 h 12 min; 6:07 AM – 6:20 PM
Cloud cover: 80%; 7th clearest
Wind: 5 km/h; 11th windiest
Solar energy: 4.79 kWh/m²
Travel score: 3.8; out of 10

← April Tonga year-round climate June →Best places to visit in May

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

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

A typical May day in Tonga reaches about 28°C in the afternoon and slips back to 20°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 30°C. Set against its neighbours, May runs about 1°C cooler than April and about 1°C warmer than June.

	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	31
Avg high (°C)	29	29	29	29	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	27
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	20

	Avg high (°C)	Avg low (°C)
1	29	20
2	29	20
3	29	20
4	29	20
5	28	20
6	28	20
7	28	20
8	28	20
9	28	20
10	28	20
11	28	20
12	28	20
13	28	20
14	28	20
15	28	20
16	28	20
17	28	20
18	28	20
19	28	20
20	28	20
21	28	20
22	28	20
23	28	20
24	28	20
25	28	20
26	28	20
27	28	20
28	28	20
29	28	20
30	28	20
31	27	20

How May really feels in Tonga

Once humidity and wind are folded in, May 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

May 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 May compares with the rest of the year at a glance. May is the 7th-warmest and 4th-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 May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 13% of May, with mostly cloudy or overcast conditions the remaining 83%.

	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	31
Clearer (%)	16	16	16	16	17	17	17	17	17	16	16	16	16	16	15	15	15	15	15	17	17	17	17	17	16	16	16	16	17	18	18
Cloudier (%)	84	84	84	84	83	83	83	83	83	84	84	84	84	84	85	85	85	85	85	83	83	83	83	83	84	84	84	84	83	82	82

	Clearer (%)	Cloudier (%)
1	16	84
2	16	84
3	16	84
4	16	84
5	17	83
6	17	83
7	17	83
8	17	83
9	17	83
10	16	84
11	16	84
12	16	84
13	16	84
14	16	84
15	15	85
16	15	85
17	15	85
18	15	85
19	15	85
20	17	83
21	17	83
22	17	83
23	17	83
24	17	83
25	16	84
26	16	84
27	16	84
28	16	84
29	17	83
30	18	82
31	18	82

Chance of precipitation in May

Any precipitation

Tonga gets around 147 mm of rain over 25.4 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 82% and peaks near 87% on the wettest days. The odds climb toward the end of the month.

	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	31
Rain chance (%)	77	77	77	77	78	78	78	78	79	79	79	80	80	80	81	81	82	82	82	83	83	84	84	85	85	86	86	87	87	87	87

	Rain chance (%)
1	77
2	77
3	77
4	77
5	78
6	78
7	78
8	78
9	79
10	79
11	79
12	80
13	80
14	80
15	81
16	81
17	82
18	82
19	82
20	83
21	83
22	84
23	84
24	85
25	85
26	86
27	86
28	87
29	87
30	87
31	87

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the muggy band about 85% 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	31
Muggy (%)	82	82	82	82	83	83	83	83	83	84	84	84	84	84	84	85	85	85	85	85	86	86	86	87	87	88	89	90	90	91	92
Oppressive (%)	18	18	18	18	17	17	17	17	17	16	16	16	16	16	16	15	15	15	15	15	14	14	14	13	13	12	11	10	10	9	8

	Muggy (%)	Oppressive (%)
1	82	18
2	82	18
3	82	18
4	82	18
5	83	17
6	83	17
7	83	17
8	83	17
9	83	17
10	84	16
11	84	16
12	84	16
13	84	16
14	84	16
15	84	16
16	85	15
17	85	15
18	85	15
19	85	15
20	85	15
21	86	14
22	86	14
23	86	14
24	87	13
25	87	13
26	88	12
27	89	11
28	90	10
29	90	10
30	91	9
31	92	8

Wind in May

Winds average 5 km/h in May.

Across May, daily wind ranges from about 5 km/h on the calmest days to 6 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	31
Wind speed (km/h)	6	6	6	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	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	calm

	Wind speed (km/h)	Feels
1	6	calm
2	6	calm
3	6	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	5	calm
23	5	calm
24	5	calm
25	5	calm
26	5	calm
27	5	calm
28	5	calm
29	5	calm
30	5	calm
31	5	calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 12 min at the start of May to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over May. Sunrise moves from 6:09 AM to 6:07 AM, and sunset from 6:20 PM to 6:23 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	31
Daylight (h)	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.3	12.3	12.3	12.3	12.3	12.3	12.3
Sunrise (AM)	6:09	6:09	6:09	6:09	6:08	6:08	6:08	6:08	6:08	6:07	6:07	6:07	6:07	6:07	6:07	6:07	6:07	6:07	6:06	6:06	6:06	6:06	6:06	6:06	6:06	6:06	6:06	6:06	6:07	6:07	6:07
Sunset (PM)	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:20	6:21	6:21	6:21	6:21	6:21	6:21	6:21	6:22	6:22	6:22	6:22	6:22	6:23

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.2	6:09	6:20
2	12.2	6:09	6:20
3	12.2	6:09	6:20
4	12.2	6:09	6:20
5	12.2	6:08	6:20
6	12.2	6:08	6:20
7	12.2	6:08	6:20
8	12.2	6:08	6:20
9	12.2	6:08	6:20
10	12.2	6:07	6:20
11	12.2	6:07	6:20
12	12.2	6:07	6:20
13	12.2	6:07	6:20
14	12.2	6:07	6:20
15	12.2	6:07	6:20
16	12.2	6:07	6:20
17	12.2	6:07	6:20
18	12.2	6:07	6:20
19	12.2	6:06	6:21
20	12.2	6:06	6:21
21	12.2	6:06	6:21
22	12.2	6:06	6:21
23	12.2	6:06	6:21
24	12.2	6:06	6:21
25	12.3	6:06	6:21
26	12.3	6:06	6:22
27	12.3	6:06	6:22
28	12.3	6:06	6:22
29	12.3	6:07	6:22
30	12.3	6:07	6:22
31	12.3	6:07	6:23

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.79 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 — May's 4.79 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	31
Solar energy (kWh/m²)	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.9	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.7	4.7	4.7	4.7	4.7	4.7	4.6	4.6	4.6	4.6
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	Bright

	Solar energy (kWh/m²)	Level
1	4.9	Bright
2	4.9	Bright
3	4.9	Bright
4	4.9	Bright
5	4.9	Bright
6	4.9	Bright
7	4.9	Bright
8	4.9	Bright
9	4.9	Bright
10	4.9	Bright
11	4.8	Bright
12	4.8	Bright
13	4.8	Bright
14	4.8	Bright
15	4.8	Bright
16	4.8	Bright
17	4.8	Bright
18	4.8	Bright
19	4.8	Bright
20	4.8	Bright
21	4.8	Bright
22	4.7	Bright
23	4.7	Bright
24	4.7	Bright
25	4.7	Bright
26	4.7	Bright
27	4.7	Bright
28	4.6	Bright
29	4.6	Bright
30	4.6	Bright
31	4.6	Bright

Planning a trip in May

Hazard calendar for Tonga

In seasonPeak

In May, 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 May a good time to visit Tonga?

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

3.8

Sightseeing

8th-best month of the year

4.3

Beach & pool

7th-best month of the year

May is a weaker month for outdoor sightseeing in Tonga.

What to pack for Tonga in May

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

In May, Tonga sees daytime highs around 28°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

UV index in Tonga in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May 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

← April Tonga year-round climate June →Best places to visit in May

May 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	29	20
2	29	20
3	29	20
4	29	20
5	28	20
6	28	20
7	28	20
8	28	20
9	28	20
10	28	20
11	28	20
12	28	20
13	28	20
14	28	20
15	28	20
16	28	20
17	28	20
18	28	20
19	28	20
20	28	20
21	28	20
22	28	20
23	28	20
24	28	20
25	28	20
26	28	20
27	28	20
28	28	20
29	28	20
30	28	20
31	27	20

	Clearer (%)	Cloudier (%)
1	16	84
2	16	84
3	16	84
4	16	84
5	17	83
6	17	83
7	17	83
8	17	83
9	17	83
10	16	84
11	16	84
12	16	84
13	16	84
14	16	84
15	15	85
16	15	85
17	15	85
18	15	85
19	15	85
20	17	83
21	17	83
22	17	83
23	17	83
24	17	83
25	16	84
26	16	84
27	16	84
28	16	84
29	17	83
30	18	82
31	18	82

	Rain chance (%)
1	77
2	77
3	77
4	77
5	78
6	78
7	78
8	78
9	79
10	79
11	79
12	80
13	80
14	80
15	81
16	81
17	82
18	82
19	82
20	83
21	83
22	84
23	84
24	85
25	85
26	86
27	86
28	87
29	87
30	87
31	87

	Muggy (%)	Oppressive (%)
1	82	18
2	82	18
3	82	18
4	82	18
5	83	17
6	83	17
7	83	17
8	83	17
9	83	17
10	84	16
11	84	16
12	84	16
13	84	16
14	84	16
15	84	16
16	85	15
17	85	15
18	85	15
19	85	15
20	85	15
21	86	14
22	86	14
23	86	14
24	87	13
25	87	13
26	88	12
27	89	11
28	90	10
29	90	10
30	91	9
31	92	8

	Avg high (°C)	Avg low (°C)
1	29	20
2	29	20
3	29	20
4	29	20
5	28	20
6	28	20
7	28	20
8	28	20
9	28	20
10	28	20
11	28	20
12	28	20
13	28	20
14	28	20
15	28	20
16	28	20
17	28	20
18	28	20
19	28	20
20	28	20
21	28	20
22	28	20
23	28	20
24	28	20
25	28	20
26	28	20
27	28	20
28	28	20
29	28	20
30	28	20
31	27	20

	Clearer (%)	Cloudier (%)
1	16	84
2	16	84
3	16	84
4	16	84
5	17	83
6	17	83
7	17	83
8	17	83
9	17	83
10	16	84
11	16	84
12	16	84
13	16	84
14	16	84
15	15	85
16	15	85
17	15	85
18	15	85
19	15	85
20	17	83
21	17	83
22	17	83
23	17	83
24	17	83
25	16	84
26	16	84
27	16	84
28	16	84
29	17	83
30	18	82
31	18	82

	Rain chance (%)
1	77
2	77
3	77
4	77
5	78
6	78
7	78
8	78
9	79
10	79
11	79
12	80
13	80
14	80
15	81
16	81
17	82
18	82
19	82
20	83
21	83
22	84
23	84
24	85
25	85
26	86
27	86
28	87
29	87
30	87
31	87

	Muggy (%)	Oppressive (%)
1	82	18
2	82	18
3	82	18
4	82	18
5	83	17
6	83	17
7	83	17
8	83	17
9	83	17
10	84	16
11	84	16
12	84	16
13	84	16
14	84	16
15	84	16
16	85	15
17	85	15
18	85	15
19	85	15
20	85	15
21	86	14
22	86	14
23	86	14
24	87	13
25	87	13
26	88	12
27	89	11
28	90	10
29	90	10
30	91	9
31	92	8

	Avg high (°C)	Avg low (°C)
1	29	20
2	29	20
3	29	20
4	29	20
5	28	20
6	28	20
7	28	20
8	28	20
9	28	20
10	28	20
11	28	20
12	28	20
13	28	20
14	28	20
15	28	20
16	28	20
17	28	20
18	28	20
19	28	20
20	28	20
21	28	20
22	28	20
23	28	20
24	28	20
25	28	20
26	28	20
27	28	20
28	28	20
29	28	20
30	28	20
31	27	20

	Clearer (%)	Cloudier (%)
1	16	84
2	16	84
3	16	84
4	16	84
5	17	83
6	17	83
7	17	83
8	17	83
9	17	83
10	16	84
11	16	84
12	16	84
13	16	84
14	16	84
15	15	85
16	15	85
17	15	85
18	15	85
19	15	85
20	17	83
21	17	83
22	17	83
23	17	83
24	17	83
25	16	84
26	16	84
27	16	84
28	16	84
29	17	83
30	18	82
31	18	82

	Rain chance (%)
1	77
2	77
3	77
4	77
5	78
6	78
7	78
8	78
9	79
10	79
11	79
12	80
13	80
14	80
15	81
16	81
17	82
18	82
19	82
20	83
21	83
22	84
23	84
24	85
25	85
26	86
27	86
28	87
29	87
30	87
31	87

	Muggy (%)	Oppressive (%)
1	82	18
2	82	18
3	82	18
4	82	18
5	83	17
6	83	17
7	83	17
8	83	17
9	83	17
10	84	16
11	84	16
12	84	16
13	84	16
14	84	16
15	84	16
16	85	15
17	85	15
18	85	15
19	85	15
20	85	15
21	86	14
22	86	14
23	86	14
24	87	13
25	87	13
26	88	12
27	89	11
28	90	10
29	90	10
30	91	9
31	92	8