Retalhuleu weather in August

In August, Retalhuleu sees average daytime highs of 30°C and overnight lows near 23°C, with 361 mm of rain across 28.6 wet days and about 12.5 hours of daylight. It is the 8th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 3% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 12 h 42 min at the start of August to 12 h 18 min by month's end. Set against the rest of the year, August is Retalhuleu's 10th-clearest and 9th-windiest month. For the whole year in context, see Retalhuleu's year-round climate.

Daytime high
30°
8th warmest
Overnight low
23°
8th coldest
Rainfall
361 mm
28.6 wet days
Daylight
12 h 30 min
5:56 AM – 6:25 PM
Cloud cover
82%
10th clearest
Wind
4 km/h
9th windiest
Solar energy
5.47 kWh/m²
Travel score
2.7
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical August day in Retalhuleu reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 32°C. Set against its neighbours, August runs on par with July and on par with September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13123
23123
33123
43123
53123
63123
73123
83123
93123
103123
113123
123023
133023
143023
153023
163023
173023
183023
193023
203023
213023
223023
233023
243023
253023
263023
273023
283023
293023
303023
313023

How August really feels in Retalhuleu

Once humidity and wind are folded in, August averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Retalhuleu weather by month

How August compares with the rest of the year at a glance. August is the 8th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 21°184.911.25.3
Feb32° / 22°153.811.54.8
Mar33° / 23°368.511.94.0
Apr33° / 23°9414.412.33.2
May32° / 24°3512712.72.6
Jun30° / 23°37428.412.82.6
Jul31° / 23°2872712.82.8
Aug30° / 23°36128.612.52.7
Sep30° / 23°45629.212.12.6
Oct30° / 23°38427.711.73.0
Nov30° / 23°11615.511.34.4
Dec31° / 22°276.111.25.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 11% of August, with mostly cloudy or overcast conditions the remaining 85%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11882
21783
31783
41783
51783
61783
71783
81783
91684
101684
111684
121684
131684
141585
151585
161585
171585
181585
191486
201486
211486
221486
231486
241288
251288
261288
271288
281189
291189
301189
311090

Chance of precipitation in August

Any precipitation

Retalhuleu gets around 361 mm of rain over 28.6 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 92% and peaks near 96% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
187
288
388
489
589
690
790
890
990
1090
1190
1291
1391
1491
1591
1691
1792
1892
1992
2093
2193
2294
2394
2494
2595
2695
2796
2896
2996
3096
3196

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the oppressive band about 92% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
19010
29010
39010
49010
59010
69010
79010
89010
99010
10919
11919
12919
13919
14919
15928
16928
17928
18928
19937
20937
21937
22946
23946
24946
25955
26955
27955
28964
29964
30973
31973

Wind in August

Winds average 4 km/h in August.

Across August, 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 August

DaylightNight

Daylight runs from about 12 h 42 min at the start of August to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over August. Sunrise moves from 5:53 AM to 5:58 AM, and sunset from 6:32 PM to 6:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:536:32
212.65:536:32
312.65:546:32
412.65:546:31
512.65:546:31
612.65:546:30
712.65:556:30
812.65:556:30
912.65:556:29
1012.65:556:29
1112.55:556:28
1212.55:556:28
1312.55:566:27
1412.55:566:27
1512.55:566:26
1612.55:566:25
1712.55:566:25
1812.55:566:24
1912.55:576:24
2012.45:576:23
2112.45:576:22
2212.45:576:22
2312.45:576:21
2412.45:576:21
2512.45:576:20
2612.45:576:19
2712.45:576:19
2812.35:586:18
2912.35:586:17
3012.35:586:16
3112.35:586:16

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.47 kWh/m².

For context, solar energy here swings from a low near 4.61 kWh/m² to a high of 6.34 kWh/m² in April across the year — August's 5.47 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
315.3Bright
Planning a trip in August

Hazard calendar for Retalhuleu

In seasonPeak

In August, Retalhuleu sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.

Retalhuleu sits in the Atlantic hurricane belt; the season peaks August–October.

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

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

Is August a good time to visit Retalhuleu?

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

2.7
Sightseeing
9th-best month of the year
3.8
Beach & pool
10th-best month of the year

August is a weaker month for outdoor sightseeing in Retalhuleu.

What to pack for Retalhuleu in August

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

In August, Retalhuleu sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 29 days see rain.

light clothesrain gearsun protection

Sea temperature near Retalhuleu in August

The nearest coast averages about 30°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 46 km away) is warmest in July at about 30°C and coldest in February near 29°C.

The water stays above 20°C all year — warm enough for a swim any month.

28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov30Tropical
Dec29Tropical

UV index in Retalhuleu in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Retalhuleu peaks around March 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 8 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highMar 21UV 12Dec 14UV 8
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar12Extreme
Apr12Extreme
May11Extreme
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep11Extreme
Oct10Extreme
Nov8Very high
Dec8Very high

Air quality in Retalhuleu in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Retalhuleu is worst in December — around 45 µg/m³ PM2.5 (poor), about 1.6× the cleanest month (June, 28 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorDec 2145 µg/m³Jun 2228 µg/m³
PM2.5 (µg/m³)Level
Jan44Poor
Feb45Poor
Mar41Poor
Apr44Poor
May40Poor
Jun28Moderate
Jul29Moderate
Aug29Moderate
Sep29Moderate
Oct30Moderate
Nov37Poor
Dec45Poor
Location & terrain

Where is Retalhuleu?

Retalhuleu sits at 14.5°N, 91.7°W, 241 m above sea level, in Guatemala. The nearest listed city is San Sebastián, 4.0 km away.

Topography around Retalhuleu

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

Within 3 km, the terrain around Retalhuleu has only modest variations in elevation — a maximum elevation change of 123 m around an average of 237 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,034 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,178 m.

The land around Retalhuleu is covered by trees (47%) and grassland (26%) within 3 km, trees (63%) and grassland (24%) within 16 km, and trees (51%) and water (22%) within 80 km.

3 km
123 m
16 km
1,034 m
80 km
4,178 m
treesgrasslandcroplandartificial surfaceswatermangroves
August weather nearby: San Sebastián 4.0 km · Nuevo San Carlos 7.0 km · El Asintal 9.0 km · San Felipe 13 km · El Palmar 17 km · San Francisco Zapotitlán 18 km · Mazatenango 19 km · Colomba 20 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 Retalhuleu (14.5358°, -91.6785°, elevation 241 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. 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).