Calpulalpan weather in September

In September, Calpulalpan sees average daytime highs of 21°C and overnight lows near 11°C, with 126 mm of rain across 17.8 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 11% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Calpulalpan's 12th-clearest and 5th-windiest month. For the whole year in context, see Calpulalpan's year-round climate.

Daytime high
21°
8th warmest
Overnight low
11°
11th coldest
Rainfall
126 mm
17.8 wet days
Daylight
12 h 06 min
6:25 AM – 6:32 PM
Cloud cover
75%
12th clearest
Wind
7 km/h
5th windiest
Solar energy
5.13 kWh/m²
Travel score
5.1
out of 10

Calpulalpan is municipal seat of Calpulalpan, State of Tlaxcala, Mexico.

Density
3,333/km²
people per km²
Founded
1608

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 21°C through the month.

A typical September day in Calpulalpan reaches about 21°C in the afternoon and slips back to 11°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 24°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12111
22111
32111
42111
52111
62111
72111
82111
92111
102111
112111
122111
132111
142111
152111
162111
172111
182111
192111
202111
212111
222111
232111
242111
252111
262110
272110
282110
292110
302110

Calpulalpan weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan19° / 184.110.97.4
Feb21° / 184.511.37.8
Mar23° / 367.911.97.5
Apr24° / 6612.712.46.7
May23° / 10°8214.412.96.4
Jun22° / 11°12616.313.25.6
Jul22° / 11°10317.413.15.3
Aug22° / 11°10717.712.75.3
Sep21° / 11°12617.812.15.1
Oct21° / 6510.411.56.3
Nov21° / 265.111.17.4
Dec20° / 122.510.87.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 74%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12674
22674
32674
42575
52575
62575
72476
82575
92575
102575
112575
122575
132575
142575
152575
162674
172674
182674
192674
202575
212575
222674
232773
242773
252872
262872
272971
282872
292872
303070

Chance of precipitation in September

Any precipitation

Calpulalpan gets around 126 mm of rain over 17.8 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 57% and peaks near 62% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
159
260
361
461
562
662
762
862
962
1061
1161
1260
1360
1459
1559
1658
1758
1857
1957
2057
2156
2256
2355
2454
2553
2652
2751
2850
2949
3048

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1973
2973
3973
4973
5973
6964
7964
8964
9964
10955
11955
12955
13955
14955
15955
16955
17955
18955
19955
20955
21955
22964
23964
24964
25964
26964
27973
28973
29973
30973

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 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
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 6:22 AM to 6:28 AM, and sunset from 6:46 PM to 6:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:226:46
212.46:226:45
312.46:236:44
412.36:236:43
512.36:236:42
612.36:236:41
712.36:246:40
812.36:246:39
912.26:246:38
1012.26:246:38
1112.26:246:37
1212.26:256:36
1312.26:256:35
1412.16:256:34
1512.16:256:33
1612.16:256:32
1712.16:266:31
1812.16:266:30
1912.16:266:29
2012.06:266:28
2112.06:266:27
2212.06:276:26
2312.06:276:25
2412.06:276:24
2511.96:276:23
2611.96:276:23
2711.96:286:22
2811.96:286:21
2911.96:286:20
3011.86:286:19

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.13 kWh/m².

For context, solar energy here swings from a low near 5.01 kWh/m² to a high of 6.94 kWh/m² in April across the year — September's 5.13 kWh/m² sits near the bottom.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.2Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.1Bright
285.1Bright
295.0Bright
305.0Bright
Planning a trip in September

Hazard calendar for Calpulalpan

In seasonPeak

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

Calpulalpan's rainy season runs April–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 Calpulalpan?

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
3.1
Beach & pool
12th-best month of the year

September is a reasonable time to visit Calpulalpan for sightseeing.

What to pack for Calpulalpan in September

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

In September, Calpulalpan sees daytime highs around 21°C and nights near 11°C. Pack rain gear. Worth having: sun protection. About 18 days see rain.

rain gearsun protection

UV index in Calpulalpan 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 Calpulalpan peaks around April 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 highExtremeVery highApr 12UV 14Dec 16UV 8
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar14Extreme
Apr15Extreme
May11Extreme
Jun15Extreme
Jul13Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Calpulalpan 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 Calpulalpan is worst in December — around 165 µg/m³ PM2.5 (very unhealthy), and holds fairly steady the rest of the year.

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyVery unhealthyDec 13163 µg/m³Aug 15114 µg/m³
PM2.5 (µg/m³)Level
Jan137Unhealthy
Feb131Unhealthy
Mar122Unhealthy
Apr120Unhealthy
May143Unhealthy
Jun121Unhealthy
Jul118Unhealthy
Aug113Unhealthy
Sep120Unhealthy
Oct121Unhealthy
Nov155Very unhealthy
Dec165Very unhealthy
Location & terrain

Where is Calpulalpan?

Calpulalpan sits at 19.6°N, 98.6°W, 2,592 m above sea level, in Mexico. The nearest listed city is Apan, 18 km away.

Topography around Calpulalpan

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

Within 3 km, the terrain around Calpulalpan has only modest variations in elevation — a maximum elevation change of 189 m around an average of 2,581 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,119 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,991 m.

The land around Calpulalpan is covered by cropland (71%) within 3 km, cropland (54%) and trees (21%) within 16 km, and cropland (32%) and trees (30%) within 80 km.

3 km
189 m
16 km
1,119 m
80 km
3,991 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Apan 18 km · Ciudad Sahagun 21 km · Tepeapulco 22 km · Teotihuacan 32 km · Teotihuacán de Arista 32 km · Tulantongo 33 km · Texcoco de Mora 34 km · Chiconcuac 35 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 Calpulalpan (19.5887°, -98.5697°, elevation 2,592 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).