Cuilapa weather in September

In September, Cuilapa sees average daytime highs of 26°C and overnight lows near 18°C, with 367 mm of rain across 28.9 wet days and about 12.1 hours of daylight. It is the 11th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 1% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Cuilapa's 12th-clearest and 12th-windiest month. For the whole year in context, see Cuilapa's year-round climate.

Daytime high
26°
11th warmest
Overnight low
18°
7th coldest
Rainfall
367 mm
28.9 wet days
Daylight
12 h 06 min
5:53 AM – 5:58 PM
Cloud cover
86%
12th clearest
Wind
4 km/h
12th windiest
Solar energy
5.08 kWh/m²
Travel score
3.5
out of 10

Cuilapa is lungsod.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 26°C through the month.

A typical September day in Cuilapa reaches about 26°C in the afternoon and slips back to 18°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 28°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12718
22718
32718
42718
52718
62718
72718
82718
92718
102718
112718
122618
132618
142618
152618
162618
172618
182618
192618
202618
212618
222618
232618
242618
252618
262618
272618
282618
292618
302618

Cuilapa weather by month

How September compares with the rest of the year at a glance. September is the 11th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 15°30.711.38.1
Feb29° / 16°41.211.57.2
Mar29° / 17°144.211.96.3
Apr29° / 18°5412.112.35.1
May28° / 18°2372612.73.9
Jun27° / 18°31126.812.83.7
Jul27° / 18°1912312.84.4
Aug27° / 18°26426.712.53.9
Sep26° / 18°36728.912.13.5
Oct26° / 17°29624.611.74.3
Nov27° / 16°569.111.36.8
Dec28° / 16°71.611.28.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 7% of September, with mostly cloudy or overcast conditions the remaining 92%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11288
21189
31189
41189
51090
61090
7991
8991
9991
10892
11892
12892
13892
14892
15892
16892
17793
18793
19793
20793
21793
22694
23694
24694
25793
26793
27892
28892
29991
301090

Chance of precipitation in September

Any precipitation

Cuilapa gets around 367 mm of rain over 28.9 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 96% and peaks near 97% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
194
294
395
495
595
695
795
895
995
1095
1195
1295
1395
1495
1595
1696
1796
1896
1997
2097
2197
2297
2397
2497
2597
2697
2796
2896
2995
3095

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 82% of days. Sticky, muggy-or-worse air turns up on roughly 82% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)
102476
202377
302377
402377
502278
602278
702278
802278
902278
1002278
1102278
1202179
1302179
1402080
1501981
1601981
1701882
1801783
1901684
2001585
2101486
2201387
2301387
2401387
2501288
2601387
2701387
2801486
2901486
3011584

Wind in September

Winds average 4 km/h in September, the calmest month.

Across September, 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.

0246810151015202530
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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over September. Sunrise moves from 5:53 AM to 5:54 AM, and sunset from 6:09 PM to 5:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:536:09
212.35:536:09
312.35:536:08
412.25:536:07
512.25:536:06
612.25:536:06
712.25:536:05
812.25:536:04
912.25:536:03
1012.25:536:03
1112.15:536:02
1212.15:536:01
1312.15:536:00
1412.15:535:59
1512.15:535:59
1612.15:535:58
1712.15:535:57
1812.15:535:56
1912.05:535:56
2012.05:535:55
2112.05:535:54
2212.05:535:53
2312.05:535:52
2412.05:545:52
2512.05:545:51
2611.95:545:50
2711.95:545:49
2811.95:545:49
2911.95:545:48
3011.95:545:47

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.08 kWh/m².

For context, solar energy here swings from a low near 4.86 kWh/m² to a high of 6.45 kWh/m² in March across the year — September's 5.08 kWh/m² sits near the bottom.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.2Bright
145.2Bright
155.2Bright
165.1Bright
175.1Bright
185.0Bright
195.0Bright
205.0Bright
214.9Bright
224.9Bright
234.9Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.7Bright
Planning a trip in September

Hazard calendar for Cuilapa

In seasonPeak

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

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

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

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

Is September a good time to visit Cuilapa?

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

3.5
Sightseeing
12th-best month of the year
3.5
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Cuilapa.

What to pack for Cuilapa in September

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

In September, Cuilapa sees daytime highs around 26°C and nights near 18°C. Pack rain gear. Worth having: light clothes and sun protection. About 29 days see rain.

rain gearlight clothessun protection

Sea temperature near Cuilapa in September

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

The sea at the nearest coast (about 45 km away) is warmest in August at about 30°C and coldest in January near 28°C.

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

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Tropical
Mar29Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Cuilapa in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Cuilapa peaks around April 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 23 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 13UV 14Nov 23UV 9
UV index (midday)Level
Jan10Very high
Feb13Extreme
Mar13Extreme
Apr14Extreme
May12Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Cuilapa in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Cuilapa is worst in April — around 34 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (January, 16 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 2233 µg/m³Jan 1416 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb17Moderate
Mar21Moderate
Apr34Moderate
May32Moderate
Jun23Moderate
Jul23Moderate
Aug21Moderate
Sep21Moderate
Oct21Moderate
Nov20Moderate
Dec17Moderate
Location & terrain

Where is Cuilapa?

Cuilapa sits at 14.3°N, 90.3°W, 983 m above sea level, in Guatemala. The nearest listed city is Barberena, 8.0 km away.

GuazacapánFraijanesSan José PinulaVilla CanalesJalpataguaPetapaSanta Catarina Pinula

Topography around Cuilapa

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

Within 3 km, the terrain around Cuilapa has large variations in elevation — a maximum elevation change of 742 m around an average of 898 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,813 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,937 m.

The land around Cuilapa is covered by trees (66%) and grassland (24%) within 3 km, trees (78%) within 16 km, and trees (47%) and grassland (22%) within 80 km.

3 km
742 m
16 km
1,813 m
80 km
3,937 m
treesshrubsgrasslandcroplandartificial surfaceswatermangroves
September weather nearby: Barberena 8.0 km · Guazacapán 26 km · Fraijanes 26 km · San José Pinula 33 km · Villa Canales 34 km · Jalpatagua 35 km · Petapa 38 km · Santa Catarina Pinula 39 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 Cuilapa (14.2754°, -90.2986°, elevation 983 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).