Comitán weather in September

In September, Comitán sees average daytime highs of 26°C and overnight lows near 17°C, with 355 mm of rain across 23.8 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 26°C through the month. The sky is clear or mostly clear about 6% of the time in September, and the air most often feels humid.

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 Comitán's 12th-clearest and 12th-windiest month. For the whole year in context, see Comitán's year-round climate.

Daytime high
26°
8th warmest
Overnight low
17°
10th coldest
Rainfall
355 mm
23.8 wet days
Daylight
12 h 06 min
6:00 AM – 6:06 PM
Cloud cover
81%
12th clearest
Wind
4 km/h
12th windiest
Solar energy
5.04 kWh/m²
Travel score
4.3
out of 10

Comitán is municipal seat of Comitán, State of Chiapas, 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 26°C through the month.

A typical September day in Comitán reaches about 26°C in the afternoon and slips back to 17°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 28°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12617
22617
32617
42617
52617
62617
72617
82617
92617
102617
112617
122617
132617
142617
152617
162617
172617
182617
192617
202617
212617
222517
232517
242517
252517
262517
272517
282517
292517
302517

Comitán 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
Jan25° / 14°71.211.18.9
Feb27° / 14°30.511.58.7
Mar29° / 15°9211.97.5
Apr29° / 17°356.112.46.0
May28° / 18°15416.812.75.0
Jun26° / 18°28822.712.94.5
Jul27° / 17°12813.812.95.7
Aug27° / 17°22217.412.55.2
Sep26° / 17°35523.812.14.3
Oct25° / 17°2181811.65.5
Nov25° / 15°426.411.27.7
Dec25° / 14°101.811.18.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 84%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11981
21981
31981
41981
51882
61882
71882
81882
91882
101882
111882
121882
131684
141684
151684
161684
171684
181684
191684
201585
211585
221585
231585
241585
251585
261585
271585
281684
291684
301684

Chance of precipitation in September

Any precipitation

Comitán gets around 355 mm of rain over 23.8 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 79% and peaks near 82% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
174
275
376
476
577
677
777
877
977
1077
1177
1277
1377
1477
1577
1678
1779
1879
1980
2080
2181
2281
2381
2482
2582
2682
2782
2882
2981
3080

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 79% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1322687
2221707
3219727
4218737
5117757
6116767
7116767
8115777
9015787
10014797
11014797
12014797
13013807
14013807
15012808
16011818
17011809
18010819
190108010
20098110
21098011
22088111
23088111
24078211
25078211
26078211
27078211
28178111
29178111
30188011

Wind in September

Winds average 4 km/h in September, the calmest month.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

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 5:59 AM to 6:02 AM, and sunset from 6:18 PM to 5:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:596:18
212.35:596:17
312.35:596:16
412.35:596:15
512.35:596:15
612.25:596:14
712.25:596:13
812.25:596:12
912.25:596:11
1012.26:006:11
1112.26:006:10
1212.26:006:09
1312.16:006:08
1412.16:006:07
1512.16:006:06
1612.16:006:06
1712.16:006:05
1812.16:006:04
1912.06:006:03
2012.06:016:02
2112.06:016:01
2212.06:016:01
2312.06:016:00
2412.06:015:59
2511.96:015:58
2611.96:015:57
2711.96:015:56
2811.96:015:56
2911.96:025:55
3011.96:025:54

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.04 kWh/m².

For context, solar energy here swings from a low near 4.79 kWh/m² to a high of 6.81 kWh/m² in April across the year — September's 5.04 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.1Bright
165.1Bright
175.1Bright
185.0Bright
195.0Bright
205.0Bright
214.9Bright
224.9Bright
234.8Bright
244.8Bright
254.8Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Comitán

In seasonPeak

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

Comitán's monsoon runs August–October, when most of the year's rain falls.

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

Is September a good time to visit Comitán?

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

4.3
Sightseeing
12th-best month of the year
4.2
Beach & pool
12th-best month of the year

September is a reasonable time to visit Comitán for sightseeing.

What to pack for Comitán in September

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

In September, Comitán sees daytime highs around 26°C and nights near 17°C. Pack rain gear. Worth having: light clothes and sun protection. About 24 days see rain.

rain gearlight clothessun protection

UV index in Comitán 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 Comitán peaks around April 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 9 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highApr 12UV 14Dec 16UV 9
UV index (midday)Level
Jan10Very high
Feb13Extreme
Mar14Extreme
Apr15Extreme
May11Extreme
Jun14Extreme
Jul13Extreme
Aug14Extreme
Sep13Extreme
Oct12Extreme
Nov9Very high
Dec9Very high

Air quality in Comitán 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 Comitán is worst in April — around 57 µg/m³ PM2.5 (unhealthy), about 6.1× the cleanest month (December, 9 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateGoodApr 1955 µg/m³Dec 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb16Moderate
Mar33Moderate
Apr57Unhealthy
May45Poor
Jun19Moderate
Jul20Moderate
Aug17Moderate
Sep16Moderate
Oct13Moderate
Nov11Good
Dec9Good
Location & terrain

Where is Comitán?

Comitán sits at 16.2°N, 92.1°W, 1,655 m above sea level, in Mexico. The nearest listed city is Las Margaritas, 18 km away.

Topography around Comitán

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

Within 3 km, the terrain around Comitán has significant variations in elevation — a maximum elevation change of 333 m around an average of 1,643 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,658 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,997 m.

The land around Comitán is covered by artificial surfaces (58%) within 3 km, trees (51%) and grassland (30%) within 16 km, and trees (66%) and grassland (22%) within 80 km.

3 km
333 m
16 km
1,658 m
80 km
2,997 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Las Margaritas 18 km · Las Rosas 29 km · Venustiano Carranza 47 km · Teopisca 49 km · Comalapa 64 km · Ocosingo 74 km · San Cristóbal de las Casas 76 km · Jacaltenango 78 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 Comitán (16.24°, -92.1367°, elevation 1,655 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).