Acatlán de Osorio weather in September

In September, Acatlán de Osorio sees average daytime highs of 28°C and overnight lows near 17°C, with 168 mm of rain across 17 wet days and about 12.1 hours of daylight. It is the 10th-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 15% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Acatlán de Osorio's 12th-clearest and 12th-windiest month. For the whole year in context, see Acatlán de Osorio's year-round climate.

Daytime high
28°
10th warmest
Overnight low
17°
9th coldest
Rainfall
168 mm
17 wet days
Daylight
12 h 06 min
6:23 AM – 6:30 PM
Cloud cover
73%
12th clearest
Wind
7 km/h
12th windiest
Solar energy
5.59 kWh/m²
Travel score
4.7
out of 10

Acatlán de Osorio is municipal seat of Acatlán, State of Puebla, 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 Acatlán de Osorio 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 26°C and 31°C. Set against its neighbours, September runs about 2°C cooler than August and on par with October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12917
22917
32917
42917
52917
62917
72917
82817
92817
102817
112817
122817
132817
142817
152817
162817
172817
182817
192817
202817
212817
222817
232817
242817
252817
262817
272817
282817
292817
302817

How September really feels in Acatlán de Osorio

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

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Acatlán de Osorio weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 12°40.8118.5
Feb29° / 13°30.611.47.5
Mar31° / 15°4111.96.0
Apr33° / 17°102.412.44.6
May32° / 18°438.212.84.0
Jun30° / 18°14415.913.14.2
Jul30° / 17°10312.1134.7
Aug30° / 17°13514.912.64.3
Sep28° / 17°1681712.14.7
Oct29° / 16°598.611.65.8
Nov29° / 14°91.911.17.1
Dec27° / 12°30.310.98.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 70%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12872
22872
32872
42872
52971
62971
72971
82971
92971
102971
113070
123070
133070
143169
153169
163169
173169
183070
193070
203070
213070
223070
233268
243268
253268
263466
273466
283565
293565
303763

Chance of precipitation in September

Any precipitation

Acatlán de Osorio gets around 168 mm of rain over 17 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 56% and peaks near 60% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
160
260
360
460
560
660
760
859
959
1058
1158
1257
1357
1456
1556
1656
1756
1855
1955
2055
2154
2254
2353
2452
2551
2651
2750
2849
2949
3048

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 43% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11934461
21834461
31735471
41636471
51536471
61437471
71338471
81339471
91240471
101241462
111142462
121142452
131143442
141144432
151045432
161045422
171046422
181047412
191047413
201047403
211048393
221148393
231148383
241248373
251348363
261448362
271547362
281647352
291746352
301846352

Wind in September

Winds average 7 km/h in September, the calmest month.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 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 30 minutes over September. Sunrise moves from 6:21 AM to 6:26 AM, and sunset from 6:43 PM to 6:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:216:43
212.36:216:42
312.36:216:41
412.36:226:40
512.36:226:39
612.36:226:38
712.36:226:38
812.26:226:37
912.26:226:36
1012.26:236:35
1112.26:236:34
1212.26:236:33
1312.26:236:32
1412.16:236:31
1512.16:236:30
1612.16:236:30
1712.16:246:29
1812.16:246:28
1912.06:246:27
2012.06:246:26
2112.06:246:25
2212.06:246:24
2312.06:256:23
2412.06:256:22
2511.96:256:21
2611.96:256:21
2711.96:256:20
2811.96:256:19
2911.96:266:18
3011.96:266:17

Solar energy in September

Daily solar energy (kWh/m²)

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

For context, solar energy here swings from a low near 5.24 kWh/m² to a high of 7.39 kWh/m² in April across the year — September's 5.59 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.7Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in September

Hazard calendar for Acatlán de Osorio

In seasonPeak

In September, Acatlán de Osorio sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Acatlán de Osorio's rainy season runs June–September, when most of the year's rain falls.

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

Is September a good time to visit Acatlán de Osorio?

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

4.7
Sightseeing
7th-best month of the year
5.7
Beach & pool
12th-best month of the year

September is a reasonable time to visit Acatlán de Osorio for sightseeing.

What to pack for Acatlán de Osorio in September

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

In September, Acatlán de Osorio sees daytime highs around 28°C and nights near 17°C. Pack light clothes and rain gear. Worth having: sun protection. About 17 days see rain.

light clothesrain gearsun protection

UV index in Acatlán de Osorio 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 Acatlán de Osorio peaks around April 11 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 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 highExtremeExtremeVery highApr 11UV 14Dec 15UV 8
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar13Extreme
Apr14Extreme
May9Very high
Jun13Extreme
Jul12Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Acatlán de Osorio 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 Acatlán de Osorio is worst in May — around 29 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (February, 13 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMay 1628 µg/m³Feb 1213 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb13Moderate
Mar15Moderate
Apr23Moderate
May29Moderate
Jun21Moderate
Jul19Moderate
Aug18Moderate
Sep21Moderate
Oct21Moderate
Nov18Moderate
Dec16Moderate
Location & terrain

Where is Acatlán de Osorio?

Acatlán de Osorio sits at 18.2°N, 98.0°W, 1,185 m above sea level, in Mexico. The nearest listed city is Ciudad de Huajuapan de León, 52 km away.

Topography around Acatlán de Osorio

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

Within 3 km, the terrain around Acatlán de Osorio has only modest variations in elevation — a maximum elevation change of 237 m around an average of 1,217 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 890 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,306 m.

The land around Acatlán de Osorio is covered by shrubs (55%) within 3 km, shrubs (83%) within 16 km, and shrubs (64%) within 80 km.

3 km
237 m
16 km
890 m
80 km
2,306 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Ciudad de Huajuapan de León 52 km · Izúcar de Matamoros 62 km · Tehuacán 75 km · Altepexi 81 km · Axochiapan 82 km · Tecamachalco 83 km · Ajalpan 86 km · Zinacatepec 86 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 Acatlán de Osorio (18.2025°, -98.0486°, elevation 1,185 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).