Tumon weather in May

In May, Tumon sees average daytime highs of 28°C and overnight lows near 27°C, with 81 mm of rain across 15 wet days and about 12.6 hours of daylight. It is the 7th-warmest and 8th-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 41% of the time in May, and the air most often feels miserable.

Daylight stretches from about 12 h 30 min at the start of May to 12 h 42 min by month's end. Set against the rest of the year, May is Tumon's 7th-clearest and 7th-windiest month. For the whole year in context, see Tumon's year-round climate.

Daytime high: 28°; 7th warmest
Overnight low: 27°; 10th coldest
Rainfall: 81 mm; 15 wet days
Daylight: 12 h 36 min; 5:58 AM – 6:36 PM
Cloud cover: 55%; 7th clearest
Wind: 22 km/h; 7th windiest
Solar energy: 6.59 kWh/m²
Travel score: 5.6; out of 10

Tumon is village of Guam, a municipality in the United States territory.

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

← April Tumon 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 Tumon reaches about 28°C in the afternoon and slips back to 27°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 28°C. Set against its neighbours, May runs on par with April and on par with 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)	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	28	28	28	28	28
Avg low (°C)	26	26	26	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27

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

How May really feels in Tumon

Once humidity and wind are folded in, May averages 23 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

The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Tumon weather by month

How May compares with the rest of the year at a glance. May is the 7th-warmest and 8th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	27° / 26°	71	14.7	11.3	6.0
Feb	27° / 26°	51	11.3	11.6	6.3
Mar	27° / 26°	45	10.2	11.9	6.7
Apr	27° / 26°	67	11.1	12.3	6.5
May	28° / 27°	81	15	12.6	5.6
Jun	28° / 27°	140	20.4	12.8	4.4
Jul	28° / 26°	273	28.4	12.7	3.3
Aug	28° / 26°	350	29.2	12.4	3.2
Sep	28° / 26°	314	27.2	12.1	3.3
Oct	28° / 26°	279	27.5	11.7	3.6
Nov	28° / 27°	175	21.5	11.4	4.5
Dec	28° / 26°	93	16.8	11.2	5.6

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 44%. 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	31
Clearer (%)	61	61	60	58	57	57	55	55	55	54	53	53	53	54	54	55	55	55	56	56	56	57	56	56	56	56	56	56	55	54	54
Cloudier (%)	39	39	40	42	43	43	45	45	45	46	47	47	47	46	46	45	45	45	44	44	44	43	44	44	44	44	44	44	45	46	46

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	60	40
4	58	42
5	57	43
6	57	43
7	55	45
8	55	45
9	55	45
10	54	46
11	53	47
12	53	47
13	53	47
14	54	46
15	54	46
16	55	45
17	55	45
18	55	45
19	56	44
20	56	44
21	56	44
22	57	43
23	56	44
24	56	44
25	56	44
26	56	44
27	56	44
28	56	44
29	55	45
30	54	46
31	54	46

Chance of precipitation in May

Any precipitation

Tumon gets around 81 mm of rain over 15 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 48% and peaks near 56% 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 (%)	43	43	43	43	43	43	43	43	44	44	45	46	46	47	48	48	49	49	50	50	51	52	52	53	53	54	54	55	55	55	56

	Rain chance (%)
1	43
2	43
3	43
4	43
5	43
6	43
7	43
8	43
9	44
10	44
11	45
12	46
13	46
14	47
15	48
16	48
17	49
18	49
19	50
20	50
21	51
22	52
23	52
24	53
25	53
26	54
27	54
28	55
29	55
30	55
31	56

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the miserable band about 66% 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
Oppressive (%)	46	45	45	44	43	43	42	41	40	39	38	37	36	35	35	34	33	32	31	31	30	29	29	28	28	27	26	26	25	24	23
Miserable (%)	54	55	55	56	57	57	58	59	60	61	62	63	64	65	65	66	67	68	69	69	70	71	71	72	72	73	74	74	75	76	77

	Oppressive (%)	Miserable (%)
1	46	54
2	45	55
3	45	55
4	44	56
5	43	57
6	43	57
7	42	58
8	41	59
9	40	60
10	39	61
11	38	62
12	37	63
13	36	64
14	35	65
15	35	65
16	34	66
17	33	67
18	32	68
19	31	69
20	31	69
21	30	70
22	29	71
23	29	71
24	28	72
25	28	72
26	27	73
27	26	74
28	26	74
29	25	75
30	24	76
31	23	77

Wind in May

Winds average 22 km/h in May.

Across May, daily wind ranges from about 20 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	31
Wind speed (km/h)	25	25	24	24	24	24	24	24	24	23	23	23	23	22	22	22	22	22	21	21	21	21	21	21	21	20	20	20	20	20	20
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	breezy

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

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 30 min at the start of May to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over May. Sunrise moves from 6:04 AM to 5:56 AM, and sunset from 6:32 PM to 6:40 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)	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.6	12.6	12.6	12.6	12.6	12.6	12.6	12.6	12.6	12.6	12.6	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7	12.7
Sunrise (AM)	6:04	6:03	6:03	6:03	6:02	6:02	6:01	6:01	6:01	6:00	6:00	6:00	5:59	5:59	5:59	5:58	5:58	5:58	5:58	5:58	5:57	5:57	5:57	5:57	5:57	5:57	5:57	5:57	5:56	5:56	5:56
Sunset (PM)	6:32	6:32	6:33	6:33	6:33	6:33	6:34	6:34	6:34	6:34	6:34	6:35	6:35	6:35	6:36	6:36	6:36	6:36	6:37	6:37	6:37	6:37	6:38	6:38	6:38	6:39	6:39	6:39	6:40	6:40	6:40

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.5	6:04	6:32
2	12.5	6:03	6:32
3	12.5	6:03	6:33
4	12.5	6:03	6:33
5	12.5	6:02	6:33
6	12.5	6:02	6:33
7	12.5	6:01	6:34
8	12.5	6:01	6:34
9	12.6	6:01	6:34
10	12.6	6:00	6:34
11	12.6	6:00	6:34
12	12.6	6:00	6:35
13	12.6	5:59	6:35
14	12.6	5:59	6:35
15	12.6	5:59	6:36
16	12.6	5:58	6:36
17	12.6	5:58	6:36
18	12.6	5:58	6:36
19	12.6	5:58	6:37
20	12.7	5:58	6:37
21	12.7	5:57	6:37
22	12.7	5:57	6:37
23	12.7	5:57	6:38
24	12.7	5:57	6:38
25	12.7	5:57	6:38
26	12.7	5:57	6:39
27	12.7	5:57	6:39
28	12.7	5:57	6:39
29	12.7	5:56	6:40
30	12.7	5:56	6:40
31	12.7	5:56	6:40

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.59 kWh/m².

For context, solar energy here swings from a low near 4.86 kWh/m² to a high of 6.68 kWh/m² in April across the year — May's 6.59 kWh/m² sits near the top of that range.

	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)	6.7	6.7	6.7	6.7	6.7	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.5	6.5	6.5	6.5	6.5	6.5	6.5	6.5	6.5	6.5	6.5
Level	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense

	Solar energy (kWh/m²)	Level
1	6.7	Intense
2	6.7	Intense
3	6.7	Intense
4	6.7	Intense
5	6.7	Intense
6	6.6	Intense
7	6.6	Intense
8	6.6	Intense
9	6.6	Intense
10	6.6	Intense
11	6.6	Intense
12	6.6	Intense
13	6.6	Intense
14	6.6	Intense
15	6.6	Intense
16	6.6	Intense
17	6.6	Intense
18	6.6	Intense
19	6.6	Intense
20	6.6	Intense
21	6.5	Intense
22	6.5	Intense
23	6.5	Intense
24	6.5	Intense
25	6.5	Intense
26	6.5	Intense
27	6.5	Intense
28	6.5	Intense
29	6.5	Intense
30	6.5	Intense
31	6.5	Intense

Planning a trip in May

Hazard calendar for Tumon

In seasonPeak

In May, Tumon sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Tumon sits in the Pacific typhoon belt; the season peaks July–October.

Tumon's monsoon runs July–November, when most of the year's rain falls.

Pacific typhoon

Monsoon

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is May a good time to visit Tumon?

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

5.6

Sightseeing

5th-best month of the year

6.1

Beach & pool

4th-best month of the year

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

What to pack for Tumon in May

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

In May, Tumon sees daytime highs around 28°C and nights near 27°C. Pack light clothes, rain gear and sun protection. Worth having: a windbreaker. About 15 days see rain.

light clothesrain gearsun protectiona windbreaker

Sea temperature near Tumon in May

The nearest coast averages about 29°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in July at about 29°C and coldest in February near 28°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)	28	28	28	28	29	29	29	29	29	29	29	28
Comfort	Warm	Warm	Warm	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical

	Sea temperature (°C)	Comfort
Jan	28	Warm
Feb	28	Warm
Mar	28	Warm
Apr	28	Tropical
May	29	Tropical
Jun	29	Tropical
Jul	29	Tropical
Aug	29	Tropical
Sep	29	Tropical
Oct	29	Tropical
Nov	29	Tropical
Dec	28	Tropical

UV index in Tumon 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 Tumon peaks around August 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 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.

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

Location & terrain

Where is Tumon?

Tumon sits at 13.5°N, 144.8°E, 13 m above sea level, in Guam. The nearest listed city is Tamuning-Tumon-Harmon Village, 0.0 km away.

Topography around Tumon

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

Within 3 km, the terrain around Tumon has only modest variations in elevation — a maximum elevation change of 109 m around an average of 32 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 308 m; within 80 km, significant variations in elevation — a maximum elevation change of 387 m.

The land around Tumon is covered by water (31%), trees (25%) and artificial surfaces (23%) within 3 km, water (59%) and trees (28%) within 16 km, and water (94%) within 80 km.

3 km

109 m

water 31%

16 km

308 m

water 59%

80 km

387 m

water 94%

treesgrasslandartificial surfacesbare terrainwater

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

May weather nearby: Tamuning-Tumon-Harmon Village 0.0 km · Hagatna 4.0 km · Mangilao Village 5.0 km · Dededo Village 7.0 km · Yigo Village 13 km · Saipan 219 km · Ngerulmud 1,294 km · Koror 1,318 km

Guam travel facts

Power plugs: Type A / B; 110 V · 60 Hz
GDP per capita: $41,833; 2022
Safe drinking water: 94%; of population, 2024
Homicide rate: 4.3; per 100k, 2019
Income group: High; World Bank
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 Tumon (13.4875°, 144.7814°, elevation 13 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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	28	26
2	28	26
3	28	26
4	28	27
5	28	27
6	28	27
7	28	27
8	28	27
9	28	27
10	28	27
11	28	27
12	28	27
13	28	27
14	28	27
15	28	27
16	28	27
17	28	27
18	28	27
19	28	27
20	28	27
21	28	27
22	28	27
23	28	27
24	28	27
25	28	27
26	28	27
27	28	27
28	28	27
29	28	27
30	28	27
31	28	27

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	60	40
4	58	42
5	57	43
6	57	43
7	55	45
8	55	45
9	55	45
10	54	46
11	53	47
12	53	47
13	53	47
14	54	46
15	54	46
16	55	45
17	55	45
18	55	45
19	56	44
20	56	44
21	56	44
22	57	43
23	56	44
24	56	44
25	56	44
26	56	44
27	56	44
28	56	44
29	55	45
30	54	46
31	54	46

	Rain chance (%)
1	43
2	43
3	43
4	43
5	43
6	43
7	43
8	43
9	44
10	44
11	45
12	46
13	46
14	47
15	48
16	48
17	49
18	49
19	50
20	50
21	51
22	52
23	52
24	53
25	53
26	54
27	54
28	55
29	55
30	55
31	56

	Oppressive (%)	Miserable (%)
1	46	54
2	45	55
3	45	55
4	44	56
5	43	57
6	43	57
7	42	58
8	41	59
9	40	60
10	39	61
11	38	62
12	37	63
13	36	64
14	35	65
15	35	65
16	34	66
17	33	67
18	32	68
19	31	69
20	31	69
21	30	70
22	29	71
23	29	71
24	28	72
25	28	72
26	27	73
27	26	74
28	26	74
29	25	75
30	24	76
31	23	77

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

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	60	40
4	58	42
5	57	43
6	57	43
7	55	45
8	55	45
9	55	45
10	54	46
11	53	47
12	53	47
13	53	47
14	54	46
15	54	46
16	55	45
17	55	45
18	55	45
19	56	44
20	56	44
21	56	44
22	57	43
23	56	44
24	56	44
25	56	44
26	56	44
27	56	44
28	56	44
29	55	45
30	54	46
31	54	46

	Rain chance (%)
1	43
2	43
3	43
4	43
5	43
6	43
7	43
8	43
9	44
10	44
11	45
12	46
13	46
14	47
15	48
16	48
17	49
18	49
19	50
20	50
21	51
22	52
23	52
24	53
25	53
26	54
27	54
28	55
29	55
30	55
31	56

	Oppressive (%)	Miserable (%)
1	46	54
2	45	55
3	45	55
4	44	56
5	43	57
6	43	57
7	42	58
8	41	59
9	40	60
10	39	61
11	38	62
12	37	63
13	36	64
14	35	65
15	35	65
16	34	66
17	33	67
18	32	68
19	31	69
20	31	69
21	30	70
22	29	71
23	29	71
24	28	72
25	28	72
26	27	73
27	26	74
28	26	74
29	25	75
30	24	76
31	23	77

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

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	60	40
4	58	42
5	57	43
6	57	43
7	55	45
8	55	45
9	55	45
10	54	46
11	53	47
12	53	47
13	53	47
14	54	46
15	54	46
16	55	45
17	55	45
18	55	45
19	56	44
20	56	44
21	56	44
22	57	43
23	56	44
24	56	44
25	56	44
26	56	44
27	56	44
28	56	44
29	55	45
30	54	46
31	54	46

	Rain chance (%)
1	43
2	43
3	43
4	43
5	43
6	43
7	43
8	43
9	44
10	44
11	45
12	46
13	46
14	47
15	48
16	48
17	49
18	49
19	50
20	50
21	51
22	52
23	52
24	53
25	53
26	54
27	54
28	55
29	55
30	55
31	56

	Oppressive (%)	Miserable (%)
1	46	54
2	45	55
3	45	55
4	44	56
5	43	57
6	43	57
7	42	58
8	41	59
9	40	60
10	39	61
11	38	62
12	37	63
13	36	64
14	35	65
15	35	65
16	34	66
17	33	67
18	32	68
19	31	69
20	31	69
21	30	70
22	29	71
23	29	71
24	28	72
25	28	72
26	27	73
27	26	74
28	26	74
29	25	75
30	24	76
31	23	77