Atoyac de Álvarez weather in September

In September, Atoyac de Álvarez sees average daytime highs of 28°C and overnight lows near 22°C, with 395 mm of rain across 27.9 wet days and about 12.1 hours of daylight. It is the 9th-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 1% 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 Atoyac de Álvarez's 12th-clearest and 8th-windiest month. For the whole year in context, see Atoyac de Álvarez's year-round climate.

Daytime high
28°
9th warmest
Overnight low
22°
9th coldest
Rainfall
395 mm
27.9 wet days
Daylight
12 h 06 min
6:33 AM – 6:39 PM
Cloud cover
86%
12th clearest
Wind
5 km/h
8th windiest
Solar energy
4.71 kWh/m²
Travel score
3.5
out of 10

Atoyac de Álvarez is municipal seat of Atoyac, State of Guerrero, Mexico.

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 Atoyac de Álvarez reaches about 28°C in the afternoon and slips back to 22°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12822
22822
32822
42822
52822
62822
72822
82822
92822
102822
112822
122822
132822
142822
152822
162822
172822
182822
192822
202822
212822
222822
232822
242822
252822
262822
272822
282822
292822
302822

Atoyac de Álvarez weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 19°132.111.18.1
Feb28° / 19°91.311.47.9
Mar29° / 20°50.711.97.3
Apr30° / 21°10.412.46.6
May30° / 22°638.712.85.3
Jun28° / 23°29923.4133.8
Jul28° / 23°26723.712.93.8
Aug28° / 23°32426.312.63.6
Sep28° / 22°39527.912.13.5
Oct28° / 22°29226.911.63.9
Nov28° / 20°7113.611.26.0
Dec27° / 19°143.7117.8

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 9% of September, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11090
21090
31090
41090
51090
6991
7991
8991
9991
10991
111090
121090
131090
141090
151090
161090
171090
181090
191090
201090
211090
221090
231189
241189
251288
261288
271387
281387
291486
301684

Chance of precipitation in September

Any precipitation

Atoyac de Álvarez gets around 395 mm of rain over 27.9 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 93% and peaks near 93% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
193
293
393
493
593
693
793
893
993
1093
1193
1293
1393
1493
1593
1693
1793
1893
1993
2093
2193
2293
2393
2493
2592
2692
2792
2892
2992
3092

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 90% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)
11189
21189
31189
41189
51189
61189
71189
81189
91189
101189
111189
121189
131189
141090
151090
161090
171090
181090
19991
20991
21991
22991
23991
24991
25991
26991
271090
281090
291090
301189

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 6:31 AM to 6:35 AM, and sunset from 6:52 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:316:52
212.36:316:51
312.36:326:50
412.36:326:49
512.36:326:48
612.36:326:48
712.26:326:47
812.26:326:46
912.26:326:45
1012.26:326:44
1112.26:336:43
1212.26:336:42
1312.16:336:42
1412.16:336:41
1512.16:336:40
1612.16:336:39
1712.16:336:38
1812.16:336:37
1912.06:346:36
2012.06:346:35
2112.06:346:35
2212.06:346:34
2312.06:346:33
2412.06:346:32
2511.96:346:31
2611.96:356:30
2711.96:356:29
2811.96:356:29
2911.96:356:28
3011.96:356:27

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.71 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.71 kWh/m² to a high of 7.33 kWh/m² in April across the year — September's 4.71 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.7Bright
174.7Bright
184.7Bright
194.7Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.6Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Atoyac de Álvarez

In seasonPeak

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

Atoyac de Álvarez sits in the eastern Pacific hurricane zone; the season peaks August–September.

Atoyac de Álvarez'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 Atoyac de Álvarez?

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
3.7
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Atoyac de Álvarez.

What to pack for Atoyac de Álvarez in September

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

In September, Atoyac de Álvarez sees daytime highs around 28°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

Sea temperature near Atoyac de Álvarez 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 22 km away) is warmest in August at about 30°C and coldest in April near 27°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
Mar27Warm
Apr27Warm
May29Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct30Tropical
Nov30Tropical
Dec29Tropical

UV index in Atoyac de Álvarez 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 Atoyac de Álvarez peaks around March 21 at about 13 (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 highExtremeVery highMar 21UV 13Dec 13UV 7
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar13Extreme
Apr12Extreme
May11Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Atoyac de Álvarez 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 Atoyac de Álvarez is worst in May — around 39 µg/m³ PM2.5 (poor), about 7.0× the cleanest month (February, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodMay 1636 µg/m³Feb 136 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb6Good
Mar7Good
Apr17Moderate
May39Poor
Jun12Moderate
Jul14Moderate
Aug10Good
Sep9Good
Oct9Good
Nov7Good
Dec7Good
Location & terrain

Where is Atoyac de Álvarez?

Atoyac de Álvarez sits at 17.2°N, 100.4°W, 59 m above sea level, in Mexico. The nearest listed city is Técpan de Galeana, 21 km away.

Topography around Atoyac de Álvarez

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

Within 3 km, the terrain around Atoyac de Álvarez has significant variations in elevation — a maximum elevation change of 302 m around an average of 73 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,522 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,534 m.

The land around Atoyac de Álvarez is covered by grassland (38%) and trees (36%) within 3 km, trees (56%) and grassland (26%) within 16 km, and trees (55%) and water (29%) within 80 km.

3 km
302 m
16 km
1,522 m
80 km
3,534 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Técpan de Galeana 21 km · Acapulco 68 km · Petatlán 96 km · Chilpancingo 106 km · Zumpango del Río 108 km · Tixtla de Guerrero 117 km · Arcelia 125 km · Zihuatanejo 128 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 Atoyac de Álvarez (17.2067°, -100.4331°, elevation 59 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).