Ostuncalco weather in May

In May, Ostuncalco sees average daytime highs of 22°C and overnight lows near 15°C, with 550 mm of rain across 30.4 wet days and about 12.7 hours of daylight. It is the 1st-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 22°C through the month. The sky is clear or mostly clear about 4% of the time in May, and the air most often feels humid.

Daylight stretches from about 12 h 30 min at the start of May to 12 h 48 min by month's end. Set against the rest of the year, May is Ostuncalco's 9th-clearest and 11th-windiest month. For the whole year in context, see Ostuncalco's year-round climate.

Daytime high
22°
1st warmest
Overnight low
15°
8th coldest
Rainfall
550 mm
30.4 wet days
Daylight
12 h 42 min
5:42 AM – 6:23 PM
Cloud cover
83%
9th clearest
Wind
4 km/h
11th windiest
Solar energy
5.54 kWh/m²
Travel score
3.5
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 22°C through the month.

A typical May day in Ostuncalco reaches about 22°C in the afternoon and slips back to 15°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 23°C. Set against its neighbours, May runs on par with April and on par with June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12215
22215
32215
42215
52215
62215
72215
82215
92215
102215
112215
122215
132215
142215
152215
162215
172215
182215
192215
202215
212215
222215
232215
242215
252215
262215
272215
282215
292215
302215
312215

Ostuncalco weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan21° / 13°309.611.27.0
Feb22° / 13°3910.311.56.8
Mar22° / 14°10920.511.95.3
Apr22° / 14°24726.912.34.0
May22° / 15°55030.412.73.5
Jun22° / 15°45229.412.93.4
Jul22° / 15°29728.812.83.7
Aug22° / 15°36330.112.53.5
Sep22° / 15°47929.812.13.3
Oct21° / 15°36229.711.73.5
Nov21° / 14°11721.211.34.9
Dec21° / 13°4311.811.16.5

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 8% of May, with mostly cloudy or overcast conditions the remaining 88%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12278
22179
32179
42080
51981
61981
71882
81882
91783
101684
111585
121486
131387
141288
151288
161090
171090
18991
19991
20892
21892
22892
23694
24694
25694
26694
27694
28595
29595
30595
31595

Chance of precipitation in May

Any precipitation

Ostuncalco gets around 550 mm of rain over 30.4 wet days in May, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 98% and peaks near 99% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
197
297
397
497
597
697
798
898
997
1097
1197
1297
1397
1497
1597
1697
1798
1898
1998
2098
2198
2298
2399
2499
2599
2699
2799
2899
2999
3099
3199

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the humid band about 56% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
165143
255045
355046
444947
544848
644749
734750
834651
934552
1034453
1134354
1234255
1334156
1434057
1533958
1633859
1723860
1823761
1923761
2023761
2123761
2223761
2313762
2413861
2513861
2613861
2713861
2813960
2903961
3003862
3103862

Wind in May

Winds average 4 km/h in May.

Across May, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 30 min at the start of May to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over May. Sunrise moves from 5:48 AM to 5:40 AM, and sunset from 6:19 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:486:19
212.55:476:20
312.55:476:20
412.65:476:20
512.65:466:20
612.65:466:21
712.65:456:21
812.65:456:21
912.65:446:21
1012.65:446:22
1112.65:446:22
1212.65:436:22
1312.75:436:23
1412.75:436:23
1512.75:426:23
1612.75:426:23
1712.75:426:24
1812.75:426:24
1912.75:416:24
2012.75:416:25
2112.75:416:25
2212.75:416:25
2312.85:416:26
2412.85:406:26
2512.85:406:26
2612.85:406:27
2712.85:406:27
2812.85:406:27
2912.85:406:27
3012.85:406:28
3112.85:406:28

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.54 kWh/m².

For context, solar energy here swings from a low near 4.46 kWh/m² to a high of 6.29 kWh/m² in April across the year — May's 5.54 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.0Intense
46.0Intense
56.0Bright
66.0Bright
75.9Bright
85.9Bright
95.8Bright
105.8Bright
115.8Bright
125.7Bright
135.7Bright
145.6Bright
155.6Bright
165.5Bright
175.5Bright
185.5Bright
195.4Bright
205.4Bright
215.3Bright
225.3Bright
235.3Bright
245.2Bright
255.2Bright
265.1Bright
275.1Bright
285.1Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in May

Hazard calendar for Ostuncalco

In seasonPeak

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

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

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

Is May a good time to visit Ostuncalco?

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

3.5
Sightseeing
8th-best month of the year
2.4
Beach & pool
8th-best month of the year

May is a weaker month for outdoor sightseeing in Ostuncalco.

What to pack for Ostuncalco in May

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

In May, Ostuncalco sees daytime highs around 22°C and nights near 15°C. Pack rain gear. Worth having: sun protection. About 30 days see rain.

rain gearsun protection

UV index in Ostuncalco in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Ostuncalco peaks around April 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 highApr 12UV 14Dec 16UV 9
UV index (midday)Level
Jan9Very high
Feb13Extreme
Mar14Extreme
Apr14Extreme
May12Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Ostuncalco 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 Ostuncalco is worst in May — around 34 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMay 934 µg/m³Aug 1622 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb22Moderate
Mar25Moderate
Apr34Moderate
May34Moderate
Jun23Moderate
Jul23Moderate
Aug22Moderate
Sep23Moderate
Oct23Moderate
Nov23Moderate
Dec25Moderate
Location & terrain

Where is Ostuncalco?

Ostuncalco sits at 14.9°N, 91.6°W, 2,506 m above sea level, in Guatemala. The nearest listed city is La Esperanza, 6.0 km away.

Topography around Ostuncalco

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

Within 3 km, the terrain around Ostuncalco has significant variations in elevation — a maximum elevation change of 574 m around an average of 2,581 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,708 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,178 m.

The land around Ostuncalco is covered by trees (38%), cropland (38%) and artificial surfaces (20%) within 3 km, trees (66%) within 16 km, and trees (69%) within 80 km.

3 km
574 m
16 km
2,708 m
80 km
4,178 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
May weather nearby: La Esperanza 6.0 km · Quetzaltenango 11 km · San Andrés Xecul 15 km · Salcajá 18 km · San Pedro Sacatepéquez 19 km · Cantel 19 km · San Francisco El Alto 21 km · San Marcos 21 km

Guatemala travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 43% of US
price level, 2025
GDP per capita
$6,598
2025
Happiness
6.5 / 10
World Happiness, 2025
Safe drinking water
49%
of population, 2024
Homicide rate
23.4
per 100k, 2023
Road deaths
22.9
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 510
Religion
Evangelical 46%Roman Catholic 42%none 11%

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 Ostuncalco (14.869°, -91.6214°, elevation 2,506 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).