Guastatoya weather in May

In May, Guastatoya sees average daytime highs of 28°C and overnight lows near 17°C, with 143 mm of rain across 17.7 wet days and about 12.7 hours of daylight. It is the 2nd-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 10% 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 Guastatoya's 9th-clearest and 9th-windiest month. For the whole year in context, see Guastatoya's year-round climate.

Daytime high
28°
2nd warmest
Overnight low
17°
12th coldest
Rainfall
143 mm
17.7 wet days
Daylight
12 h 42 min
5:36 AM – 6:17 PM
Cloud cover
75%
9th clearest
Wind
6 km/h
9th windiest
Solar energy
5.59 kWh/m²
Travel score
4.9
out of 10

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 Guastatoya reaches about 28°C in the afternoon and slips back to 17°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 30°C. Set against its neighbours, May runs about 1°C cooler than April and about 1°C warmer than June.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12917
22817
32817
42817
52817
62817
72817
82817
92817
102817
112817
122817
132817
142817
152817
162817
172817
182817
192717
202717
212717
222717
232717
242717
252717
262717
272717
282717
292717
302717
312717

Guastatoya weather by month

How May compares with the rest of the year at a glance. May is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 13°62.111.28.5
Feb26° / 13°41.311.58.4
Mar28° / 14°123.211.97.7
Apr29° / 16°417.312.36.1
May28° / 17°14317.712.74.9
Jun26° / 17°21524.312.94.2
Jul26° / 16°11418.712.85.2
Aug26° / 17°13820.112.54.9
Sep26° / 17°21624.912.14.1
Oct25° / 16°14318.811.75.3
Nov24° / 15°326.111.37.5
Dec24° / 14°112.611.18.4

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% 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 76%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13961
23961
33763
43664
53565
63565
73268
83268
93169
102971
112971
122773
132575
142476
152377
162377
172080
182080
191981
201981
211783
221783
231783
241585
251585
261486
271486
281387
291387
301288
311288

Chance of precipitation in May

Any precipitation

Guastatoya gets around 143 mm of rain over 17.7 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 57% and peaks near 81% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
134
235
336
438
539
640
742
843
945
1047
1148
1250
1352
1454
1556
1657
1759
1861
1963
2065
2166
2268
2370
2471
2573
2674
2776
2877
2978
3080
3181

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 70% of days. Sticky, muggy-or-worse air turns up on roughly 8% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1636553
2635563
3534574
4533584
5432604
6430624
7329635
8328645
9327655
10326665
11224686
12223696
13222697
14221707
15219718
16218728
17217729
18216739
19215749
201147510
211147510
221137610
231127611
241117711
251117711
261107712
27197812
28087913
29087913
30078013
31068014

Wind in May

Winds average 6 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.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

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 5:42 AM to 5:33 AM, and sunset from 6:13 PM to 6:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:426:13
212.55:416:13
312.55:416:14
412.65:406:14
512.65:406:14
612.65:396:14
712.65:396:15
812.65:396:15
912.65:386:15
1012.65:386:15
1112.65:376:16
1212.65:376:16
1312.75:376:16
1412.75:366:17
1512.75:366:17
1612.75:366:17
1712.75:366:17
1812.75:356:18
1912.75:356:18
2012.75:356:18
2112.75:356:19
2212.75:346:19
2312.85:346:19
2412.85:346:20
2512.85:346:20
2612.85:346:20
2712.85:346:21
2812.85:346:21
2912.85:346:21
3012.85:336:22
3112.85:336:22

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.59 kWh/m².

For context, solar energy here swings from a low near 4.5 kWh/m² to a high of 6.23 kWh/m² in April across the year — May's 5.59 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.0Intense
46.0Bright
56.0Bright
65.9Bright
75.9Bright
85.9Bright
95.8Bright
105.8Bright
115.8Bright
125.7Bright
135.7Bright
145.7Bright
155.6Bright
165.6Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.4Bright
225.4Bright
235.4Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in May

Hazard calendar for Guastatoya

In seasonPeak

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

Guastatoya's monsoon runs May–October, when most of the year's rain falls.

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

Is May a good time to visit Guastatoya?

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

4.9
Sightseeing
9th-best month of the year
5.4
Beach & pool
7th-best month of the year

May is a reasonable time to visit Guastatoya for sightseeing.

What to pack for Guastatoya in May

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

In May, Guastatoya sees daytime highs around 28°C and nights near 17°C. Pack light clothes and rain gear. Worth having: sun protection. About 18 days see rain.

light clothesrain gearsun protection

UV index in Guastatoya 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 Guastatoya peaks around April 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 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 15UV 9
UV index (midday)Level
Jan10Very high
Feb13Extreme
Mar14Extreme
Apr14Extreme
May13Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep13Extreme
Oct12Extreme
Nov10Very high
Dec9Very high

Air quality in Guastatoya 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 Guastatoya is worst in April — around 55 µg/m³ PM2.5 (unhealthy), about 3.0× the cleanest month (November, 18 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateApr 1853 µg/m³Nov 2318 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb20Moderate
Mar25Moderate
Apr55Unhealthy
May39Poor
Jun24Moderate
Jul23Moderate
Aug21Moderate
Sep21Moderate
Oct20Moderate
Nov18Moderate
Dec18Moderate
Location & terrain

Where is Guastatoya?

Guastatoya sits at 14.9°N, 90.1°W, 520 m above sea level, in Guatemala. The nearest listed city is Sanarate, 16 km away.

JalapaPalenciaSalamáSan Pedro AyampucSan Luis JilotepequeChinautlaSan José Pinula

Topography around Guastatoya

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

Within 3 km, the terrain around Guastatoya has large variations in elevation — a maximum elevation change of 682 m around an average of 638 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,805 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,984 m.

The land around Guastatoya is covered by shrubs (70%) within 3 km, shrubs (60%) and trees (24%) within 16 km, and trees (64%) within 80 km.

3 km
682 m
16 km
1,805 m
80 km
2,984 m
treesshrubsgrasslandcroplandartificial surfaces
May weather nearby: Sanarate 16 km · Jalapa 26 km · Palencia 37 km · Salamá 38 km · San Pedro Ayampuc 42 km · San Luis Jilotepeque 44 km · Chinautla 49 km · San José Pinula 50 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 Guastatoya (14.8544°, -90.0699°, elevation 520 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).