Ajalpan weather in September

In September, Ajalpan sees average daytime highs of 23°C and overnight lows near 14°C, with 161 mm of rain across 19.6 wet days and about 12.1 hours of daylight. It is the 7th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 23°C through the month. The sky is clear or mostly clear about 8% 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 Ajalpan's 12th-clearest and 10th-windiest month. For the whole year in context, see Ajalpan's year-round climate.

Daytime high
23°
7th warmest
Overnight low
14°
11th coldest
Rainfall
161 mm
19.6 wet days
Daylight
12 h 06 min
6:20 AM – 6:26 PM
Cloud cover
78%
12th clearest
Wind
7 km/h
10th windiest
Solar energy
5.2 kWh/m²
Travel score
5.1
out of 10

Ajalpan is municipal seat of Ajalpan, 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 23°C through the month.

A typical September day in Ajalpan reaches about 23°C in the afternoon and slips back to 14°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 25°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)
12314
22314
32314
42314
52314
62314
72314
82314
92314
102314
112314
122314
132314
142314
152314
162314
172314
182314
192314
202314
212314
222314
232314
242314
252314
262314
272314
282314
292313
302313

Ajalpan weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 144.2117.3
Feb22° / 134.211.47.8
Mar24° / 11°226.311.97.9
Apr25° / 13°4510.512.46.9
May25° / 14°9217.412.95.8
Jun24° / 14°15719.913.15.2
Jul23° / 13°10615.1135.9
Aug24° / 13°11316.512.65.8
Sep23° / 14°16119.612.15.1
Oct22° / 12°9814.311.65.9
Nov21° / 10°358.311.16.8
Dec20° / 134.110.97.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% 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 78%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12476
22476
32377
42377
52377
62377
72179
82179
92179
102179
112179
122278
132278
142278
152179
162278
172278
182278
192278
202179
212179
222179
232179
242278
252278
262278
272278
282278
292278
302278

Chance of precipitation in September

Any precipitation

Ajalpan gets around 161 mm of rain over 19.6 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 65% and peaks near 66% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
164
264
365
465
566
666
766
866
966
1066
1166
1266
1365
1465
1564
1664
1764
1864
1964
2064
2164
2264
2364
2464
2564
2664
2763
2863
2963
3063

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 76% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
122735
221745
320755
420746
519756
618766
718757
817767
917767
1017758
1117758
1217758
1317758
1417758
1516759
1616759
1716759
1815769
1915778
2015778
2115778
2215778
2316768
2416777
2516777
2617767
2717767
2818757
2918766
3019756

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 7 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
297calm
307calm

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
512.36:186:36
612.36:196:35
712.36:196:35
812.26:196:34
912.26:196:33
1012.26:196:32
1112.26:196:31
1212.26:206:30
1312.26:206:29
1412.16:206:28
1512.16:206:27
1612.16:206:26
1712.16:206:26
1812.16:216:25
1912.06:216:24
2012.06:216:23
2112.06:216:22
2212.06:216:21
2312.06:216:20
2412.06:226:19
2511.96:226:18
2611.96:226:17
2711.96:226:17
2811.96:226:16
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 5.2 kWh/m².

For context, solar energy here swings from a low near 4.57 kWh/m² to a high of 6.88 kWh/m² in April across the year — September's 5.2 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.4Bright
85.4Bright
95.4Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
Planning a trip in September

Hazard calendar for Ajalpan

In seasonPeak

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

Ajalpan'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 Ajalpan?

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

5.1
Sightseeing
12th-best month of the year
3.9
Beach & pool
11th-best month of the year

September is a reasonable time to visit Ajalpan for sightseeing.

What to pack for Ajalpan in September

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

In September, Ajalpan sees daytime highs around 23°C and nights near 14°C. Pack rain gear. Worth having: light clothes and sun protection. About 20 days see rain.

rain gearlight clothessun protection

UV index in Ajalpan 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 Ajalpan 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 Ajalpan 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 Ajalpan is worst in May — around 38 µg/m³ PM2.5 (poor), about 1.9× the cleanest month (January, 20 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateMay 1737 µg/m³Jan 2220 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb20Moderate
Mar23Moderate
Apr29Moderate
May38Poor
Jun30Moderate
Jul25Moderate
Aug22Moderate
Sep25Moderate
Oct22Moderate
Nov22Moderate
Dec23Moderate
Location & terrain

Where is Ajalpan?

Ajalpan sits at 18.4°N, 97.3°W, 1,223 m above sea level, in Mexico. The nearest listed city is Altepexi, 4.0 km away.

Topography around Ajalpan

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

Within 3 km, the terrain around Ajalpan has significant variations in elevation — a maximum elevation change of 271 m around an average of 1,226 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,948 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,498 m.

The land around Ajalpan is covered by shrubs (42%), cropland (23%) and artificial surfaces (20%) within 3 km, shrubs (61%) within 16 km, and shrubs (42%) and trees (37%) within 80 km.

3 km
271 m
16 km
1,948 m
80 km
5,498 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Altepexi 4.0 km · Zinacatepec 5.0 km · Tehuacán 17 km · Ciudad Mendoza 48 km · Nogales 51 km · Río Blanco 51 km · Orizaba 55 km · Ixtaczoquitlán 57 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 Ajalpan (18.3791°, -97.2587°, elevation 1,223 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).