Acapulco weather in September

In September, Acapulco sees average daytime highs of 28°C and overnight lows near 26°C, with 318 mm of rain across 22.6 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 1st-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 9% of the time in September, and the air most often feels oppressive.

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 Acapulco's 12th-clearest and 5th-windiest month. For the whole year in context, see Acapulco's year-round climate.

Daytime high
28°
4th warmest
Overnight low
26°
7th coldest
Rainfall
318 mm
22.6 wet days
Daylight
12 h 06 min
6:31 AM – 6:37 PM
Cloud cover
79%
12th clearest
Wind
12 km/h
5th windiest
Solar energy
4.95 kWh/m²
Travel score
3.9
out of 10

Acapulco is municipal seat of Acapulco, State of Guerrero, Mexico.

Density
350/km²
people per km²
Founded
1520

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 28°C through the month.

A typical September day in Acapulco reaches about 28°C in the afternoon and slips back to 26°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

24°26°28°30°32°151015202530
Avg high (°C)Avg low (°C)
12926
22926
32926
42926
52926
62926
72926
82826
92826
102826
112826
122826
132826
142826
152826
162826
172826
182826
192826
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302826

How September really feels in Acapulco

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Acapulco weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 26°80.911.18.4
Feb27° / 25°30.311.48.7
Mar27° / 26°40.411.98.7
Apr27° / 26°00.112.48.6
May28° / 27°233.812.87.1
Jun29° / 27°22016.2134.7
Jul29° / 27°18116.312.94.5
Aug29° / 27°2661912.64.2
Sep28° / 26°31822.612.13.9
Oct28° / 26°19617.611.64.8
Nov28° / 27°324.511.26.9
Dec28° / 26°60.8118.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 9% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 79%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12179
22179
32179
42179
52080
62179
72278
82278
92278
102179
112278
122278
132278
142278
152179
162179
172080
182080
191981
201981
211981
221882
231882
242080
252080
262080
272179
282278
292476
302476

Chance of precipitation in September

Any precipitation

Acapulco gets around 318 mm of rain over 22.6 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 74% and peaks near 76% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
172
273
374
474
574
675
775
875
975
1075
1175
1275
1375
1475
1575
1675
1776
1876
1976
2076
2175
2275
2375
2474
2574
2673
2773
2872
2971
3070

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 55% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
15248
25347
35347
45347
55347
65446
75446
85446
95446
105446
115446
125446
135446
145545
155545
165545
175545
185545
195545
205644
215644
225644
235644
245644
255644
265545
275545
285545
295446
305446

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2711calm
2811calm
2911calm
3011calm

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 6:29 AM to 6:33 AM, and sunset from 6:49 PM to 6:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:296:49
212.36:296:49
312.36:306:48
412.36:306:47
512.36:306:46
612.36:306:45
712.26:306:44
812.26:306:44
912.26:306:43
1012.26:306:42
1112.26:316:41
1212.26:316:40
1312.16:316:39
1412.16:316:38
1512.16:316:38
1612.16:316:37
1712.16:316:36
1812.16:316:35
1912.06:316:34
2012.06:326:33
2112.06:326:32
2212.06:326:32
2312.06:326:31
2412.06:326:30
2511.96:326:29
2611.96:326:28
2711.96:336:27
2811.96:336:27
2911.96:336:26
3011.96:336:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.95 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.95 kWh/m² to a high of 7.31 kWh/m² in April across the year — September's 4.95 kWh/m² sits near the bottom.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Hazard calendar for Acapulco

In seasonPeak

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

Acapulco sits in the eastern Pacific hurricane zone; the season peaks August–September.

Acapulco's monsoon runs June–October, when most of the year's rain falls.

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

Is September a good time to visit Acapulco?

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

3.9
Sightseeing
12th-best month of the year
4.7
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Acapulco.

What to pack for Acapulco in September

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

In September, Acapulco sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 23 days see rain.

light clothesrain gearsun protection

Sea temperature near Acapulco 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 offshore is warmest in August at about 30°C and coldest in March 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
Jan29Tropical
Feb28Warm
Mar28Warm
Apr28Warm
May29Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct30Tropical
Nov30Tropical
Dec29Tropical

UV index in Acapulco in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Acapulco peaks around March 20 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeExtremeVery highMar 20UV 12Dec 13UV 7
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar12Extreme
Apr12Extreme
May10Very high
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Acapulco 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 Acapulco is worst in May — around 23 µg/m³ PM2.5 (moderate), about 4.5× the cleanest month (February, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMay 1522 µg/m³Feb 125 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb5Good
Mar8Good
Apr16Moderate
May23Moderate
Jun12Good
Jul15Moderate
Aug12Good
Sep9Good
Oct7Good
Nov6Good
Dec6Good
Location & terrain

Where is Acapulco?

Acapulco sits at 16.8°N, 99.9°W, 16 m above sea level, in Mexico. The nearest listed city is Atoyac de Álvarez, 68 km away.

Topography around Acapulco

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

Within 3 km, the terrain around Acapulco has significant variations in elevation — a maximum elevation change of 357 m around an average of 39 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 934 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,534 m.

The land around Acapulco is covered by water (48%) and artificial surfaces (40%) within 3 km, water (53%) and trees (24%) within 16 km, and trees (48%) and water (36%) within 80 km.

3 km
357 m
16 km
934 m
80 km
3,534 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Atoyac de Álvarez 68 km · Técpan de Galeana 87 km · Ayutla de los Libres 87 km · Chilpancingo 89 km · Tixtla de Guerrero 97 km · Zumpango del Río 98 km · Chilapa de Álvarez 114 km · Ometepec 161 km

Mexico travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 / 127 V · 60 Hz
Prices
≈ 54% of US
price level, 2025
GDP per capita
$13,889
2025
Happiness
7.0 / 10
World Happiness, 2025
Safe drinking water
43%
of population, 2024
Homicide rate
24.9
per 100k, 2023
Road deaths
12.8
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 440
Religion
Catholic 78%no religion 11%other Evangelical Churches 8%Jehovah Witness 1%

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 Acapulco (16.8494°, -99.9089°, elevation 16 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).