Altepexi weather in September

In September, Altepexi sees average daytime highs of 25°C and overnight lows near 15°C, with 125 mm of rain across 17.5 wet days and about 12.1 hours of daylight. It is the 7th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 10% 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 Altepexi's 12th-clearest and 11th-windiest month. For the whole year in context, see Altepexi's year-round climate.

Daytime high
25°
7th warmest
Overnight low
15°
11th coldest
Rainfall
125 mm
17.5 wet days
Daylight
12 h 06 min
6:20 AM – 6:27 PM
Cloud cover
77%
12th clearest
Wind
5 km/h
11th windiest
Solar energy
5.12 kWh/m²
Travel score
5.4
out of 10

Altepexi is municipal seat of Altepexi, 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 25°C through the month.

A typical September day in Altepexi reaches about 25°C in the afternoon and slips back to 15°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 28°C. Set against its neighbours, September runs on par with August and on par with October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12615
22615
32515
42515
52515
62515
72515
82515
92515
102515
112515
122515
132515
142515
152515
162515
172515
182515
192515
202515
212515
222515
232515
242515
252515
262515
272515
282515
292515
302515

Altepexi weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 133.7117.9
Feb24° / 10°123.411.48.2
Mar27° / 12°195.111.97.7
Apr28° / 14°368.312.46.4
May28° / 15°6513.912.95.8
Jun26° / 16°12717.413.15.4
Jul26° / 15°8612.7136.2
Aug26° / 15°8613.812.66.0
Sep25° / 15°12517.512.15.4
Oct24° / 14°7811.711.66.5
Nov23° / 12°27711.17.4
Dec22° / 10°123.510.97.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 76%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12773
22674
32575
42575
52575
62575
72476
82476
92476
102476
112476
122476
132476
142476
152476
162476
172476
182476
192377
202377
212377
222377
232377
242476
252476
262476
272476
282476
292575
302575

Chance of precipitation in September

Any precipitation

Altepexi gets around 125 mm of rain over 17.5 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 57% and peaks near 59% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
155
255
356
457
558
658
759
859
959
1059
1159
1259
1358
1458
1558
1658
1758
1858
1958
2058
2158
2257
2357
2457
2556
2656
2756
2855
2955
3054

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 68% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
176825
266826
366826
466826
556827
656827
756827
856728
946828
1046828
1146828
1246828
1346828
1446828
1546828
1646828
1746828
1846828
1946927
2046927
2146927
2256827
2356926
2466826
2566925
2676825
2786725
2896625
29106525
30106624

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 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 6:18 AM to 6:23 AM, and sunset from 6:40 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:186:40
212.36:186:39
312.36:186:38
412.36:186:37
512.36:196:36
612.36:196:36
712.36:196:35
812.26:196:34
912.26:196:33
1012.26:196:32
1112.26:206:31
1212.26:206:30
1312.26:206:29
1412.16:206:28
1512.16:206:28
1612.16:206:27
1712.16:216:26
1812.16:216:25
1912.06:216:24
2012.06:216:23
2112.06:216:22
2212.06:216:21
2312.06:226:20
2412.06:226:19
2511.96:226:18
2611.96:226:18
2711.96:226:17
2811.96:236:16
2911.96:236:15
3011.96:236:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.12 kWh/m².

For context, solar energy here swings from a low near 4.53 kWh/m² to a high of 6.96 kWh/m² in April across the year — September's 5.12 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.4Bright
45.4Bright
55.4Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
274.9Bright
284.9Bright
294.9Bright
304.9Bright
Planning a trip in September

Hazard calendar for Altepexi

In seasonPeak

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

Altepexi's rainy season runs May–October, 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 Altepexi?

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

5.4
Sightseeing
11th-best month of the year
5.0
Beach & pool
12th-best month of the year

September is a reasonable time to visit Altepexi for sightseeing.

What to pack for Altepexi in September

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

In September, Altepexi sees daytime highs around 25°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 18 days see rain.

rain gearlight clothessun protection

UV index in Altepexi in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Altepexi peaks around April 12 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 12UV 14Dec 15UV 8
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar13Extreme
Apr15Extreme
May9Very high
Jun13Extreme
Jul12Extreme
Aug14Extreme
Sep13Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Altepexi 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 Altepexi is worst in May — around 27 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (January, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateMay 1626 µg/m³Jan 1811 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb12Good
Mar14Moderate
Apr21Moderate
May27Moderate
Jun19Moderate
Jul19Moderate
Aug15Moderate
Sep16Moderate
Oct13Moderate
Nov12Moderate
Dec12Moderate
Location & terrain

Where is Altepexi?

Altepexi sits at 18.4°N, 97.3°W, 1,238 m above sea level, in Mexico. The nearest listed city is Ajalpan, 4.0 km away.

Topography around Altepexi

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

Within 3 km, the terrain around Altepexi has only modest variations in elevation — a maximum elevation change of 125 m around an average of 1,255 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,622 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,498 m.

The land around Altepexi is covered by cropland (53%) within 3 km, shrubs (66%) within 16 km, and shrubs (44%) and trees (34%) within 80 km.

3 km
125 m
16 km
1,622 m
80 km
5,498 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Ajalpan 4.0 km · Zinacatepec 7.0 km · Tehuacán 15 km · Ciudad Mendoza 50 km · Nogales 53 km · Río Blanco 53 km · Orizaba 58 km · Ixtaczoquitlán 59 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 Altepexi (18.3703°, -97.2997°, elevation 1,238 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).