Chiapas weather in September

In September, Chiapas sees average daytime highs of 27°C and overnight lows near 19°C, with 341 mm of rain across 27.8 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 4% of the time in September, and the air most often feels muggy.

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 Chiapas's 12th-clearest and 9th-windiest month. For the whole year in context, see Chiapas's year-round climate.

Daytime high: 27°; 8th warmest
Overnight low: 19°; 10th coldest
Rainfall: 341 mm; 27.8 wet days
Daylight: 12 h 06 min; 6:04 AM – 6:09 PM
Cloud cover: 84%; 12th clearest
Wind: 4 km/h; 9th windiest
Solar energy: 4.77 kWh/m²
Travel score: 3.7; out of 10

Chiapas is municipal seat of Chiapa de Corzo, State of Chiapas, Mexico.

Founded: 1528

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Chiapas year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical September day in Chiapas reaches about 27°C in the afternoon and slips back to 19°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	26	26	26
Avg low (°C)	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19

	Avg high (°C)	Avg low (°C)
1	27	19
2	27	19
3	27	19
4	27	19
5	27	19
6	27	19
7	27	19
8	27	19
9	27	19
10	27	19
11	27	19
12	27	19
13	27	19
14	27	19
15	27	19
16	27	19
17	27	19
18	27	19
19	27	19
20	27	19
21	27	19
22	27	19
23	27	19
24	27	19
25	27	19
26	27	19
27	27	19
28	26	19
29	26	19
30	26	19

Chiapas weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 2nd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	26° / 15°	7	1.9	11.1	8.5
Feb	28° / 15°	5	1.4	11.4	7.9
Mar	29° / 17°	11	2.8	11.9	6.5
Apr	31° / 18°	33	7.3	12.4	5.1
May	30° / 19°	158	18.7	12.8	4.1
Jun	28° / 19°	369	26.9	13	3.6
Jul	28° / 18°	294	26	12.9	3.9
Aug	28° / 19°	326	26.7	12.6	3.9
Sep	27° / 19°	341	27.8	12.1	3.7
Oct	26° / 18°	172	18.1	11.6	5.2
Nov	26° / 16°	45	6.5	11.2	7.4
Dec	26° / 15°	13	2	11	8.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 9% of September, with mostly cloudy or overcast conditions the remaining 87%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	14	14	13	12	12	12	12	12	12	12	12	12	11	12	12	12	12	12	12	12	12	12	12	12	13	14	14	14	16	16
Cloudier (%)	86	86	87	88	88	88	88	88	88	88	88	88	89	88	88	88	88	88	88	88	88	88	88	88	87	86	86	86	84	84

	Clearer (%)	Cloudier (%)
1	14	86
2	14	86
3	13	87
4	12	88
5	12	88
6	12	88
7	12	88
8	12	88
9	12	88
10	12	88
11	12	88
12	12	88
13	11	89
14	12	88
15	12	88
16	12	88
17	12	88
18	12	88
19	12	88
20	12	88
21	12	88
22	12	88
23	12	88
24	12	88
25	13	87
26	14	86
27	14	86
28	14	86
29	16	84
30	16	84

Chance of precipitation in September

Any precipitation

Chiapas gets around 341 mm of rain over 27.8 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 91% and peaks near 93% on the wettest days. The odds ease toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	93	93	93	93	93	93	93	92	92	92	92	92	92	92	92	92	92	92	92	92	92	92	92	91	90	89	88	87	85	84

	Rain chance (%)
1	93
2	93
3	93
4	93
5	93
6	93
7	93
8	92
9	92
10	92
11	92
12	92
13	92
14	92
15	92
16	92
17	92
18	92
19	92
20	92
21	92
22	92
23	92
24	91
25	90
26	89
27	88
28	87
29	85
30	84

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 92% of days. Sticky, muggy-or-worse air turns up on roughly 92% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Comfortable (%)	0	0	0	1	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1
Humid (%)	6	5	5	5	5	5	5	6	6	6	6	6	6	6	6	5	5	5	6	6	6	7	8	9	9	10	11	12	13	14
Muggy (%)	94	95	95	94	94	94	94	93	93	93	93	93	93	93	94	95	95	95	94	94	94	93	92	91	91	90	88	87	86	85

	Comfortable (%)	Humid (%)	Muggy (%)
1	0	6	94
2	0	5	95
3	0	5	95
4	1	5	94
5	1	5	94
6	1	5	94
7	1	5	94
8	1	6	93
9	1	6	93
10	1	6	93
11	1	6	93
12	1	6	93
13	1	6	93
14	1	6	93
15	0	6	94
16	0	5	95
17	0	5	95
18	0	5	95
19	0	6	94
20	0	6	94
21	0	6	94
22	0	7	93
23	0	8	92
24	0	9	91
25	0	9	91
26	0	10	90
27	1	11	88
28	1	12	87
29	1	13	86
30	1	14	85

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	5	5	5	5	5	5
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	5	calm
26	5	calm
27	5	calm
28	5	calm
29	5	calm
30	5	calm

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 6:02 AM to 6:05 AM, and sunset from 6:22 PM to 5:57 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.3	12.3	12.3	12.3	12.3	12.3	12.2	12.2	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9	11.9	11.9
Sunrise (AM)	6:02	6:02	6:02	6:02	6:02	6:02	6:03	6:03	6:03	6:03	6:03	6:03	6:03	6:03	6:03	6:04	6:04	6:04	6:04	6:04	6:04	6:04	6:04	6:05	6:05	6:05	6:05	6:05	6:05	6:05
Sunset (PM)	6:22	6:21	6:20	6:19	6:18	6:18	6:17	6:16	6:15	6:14	6:13	6:13	6:12	6:11	6:10	6:09	6:08	6:07	6:07	6:06	6:05	6:04	6:03	6:02	6:02	6:01	6:00	5:59	5:58	5:57

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.3	6:02	6:22
2	12.3	6:02	6:21
3	12.3	6:02	6:20
4	12.3	6:02	6:19
5	12.3	6:02	6:18
6	12.3	6:02	6:18
7	12.2	6:03	6:17
8	12.2	6:03	6:16
9	12.2	6:03	6:15
10	12.2	6:03	6:14
11	12.2	6:03	6:13
12	12.2	6:03	6:13
13	12.1	6:03	6:12
14	12.1	6:03	6:11
15	12.1	6:03	6:10
16	12.1	6:04	6:09
17	12.1	6:04	6:08
18	12.1	6:04	6:07
19	12.0	6:04	6:07
20	12.0	6:04	6:06
21	12.0	6:04	6:05
22	12.0	6:04	6:04
23	12.0	6:04	6:03
24	12.0	6:05	6:02
25	11.9	6:05	6:02
26	11.9	6:05	6:01
27	11.9	6:05	6:00
28	11.9	6:05	5:59
29	11.9	6:05	5:58
30	11.9	6:05	5:57

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.77 kWh/m².

For context, solar energy here swings from a low near 4.39 kWh/m² to a high of 6.61 kWh/m² in April across the year — September's 4.77 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	5.1	5.1	5.1	5.1	5.1	5.0	5.0	5.0	5.0	5.0	5.0	4.9	4.9	4.9	4.9	4.8	4.8	4.8	4.7	4.7	4.7	4.6	4.6	4.5	4.5	4.5	4.5	4.5	4.4	4.4
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.1	Bright
2	5.1	Bright
3	5.1	Bright
4	5.1	Bright
5	5.1	Bright
6	5.0	Bright
7	5.0	Bright
8	5.0	Bright
9	5.0	Bright
10	5.0	Bright
11	5.0	Bright
12	4.9	Bright
13	4.9	Bright
14	4.9	Bright
15	4.9	Bright
16	4.8	Bright
17	4.8	Bright
18	4.8	Bright
19	4.7	Bright
20	4.7	Bright
21	4.7	Bright
22	4.6	Bright
23	4.6	Bright
24	4.5	Bright
25	4.5	Bright
26	4.5	Bright
27	4.5	Bright
28	4.5	Bright
29	4.4	Bright
30	4.4	Bright

Planning a trip in September

Hazard calendar for Chiapas

In seasonPeak

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

Chiapas's monsoon runs June–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 Chiapas?

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

3.7

Sightseeing

11th-best month of the year

3.8

Beach & pool

12th-best month of the year

September is a weaker month for outdoor sightseeing in Chiapas.

What to pack for Chiapas in September

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

In September, Chiapas sees daytime highs around 27°C and nights near 19°C. Pack rain gear. Worth having: light clothes and sun protection. About 28 days see rain.

rain gearlight clothessun protection

UV index in Chiapas 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 Chiapas peaks around April 11 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 8 (very high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	9	12	13	14	12	14	12	13	12	11	9	8
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

	UV index (midday)	Level
Jan	9	Very high
Feb	12	Extreme
Mar	13	Extreme
Apr	14	Extreme
May	12	Extreme
Jun	14	Extreme
Jul	12	Extreme
Aug	13	Extreme
Sep	12	Extreme
Oct	11	Extreme
Nov	9	Very high
Dec	8	Very high

Air quality in Chiapas 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 Chiapas is worst in April — around 38 µg/m³ PM2.5 (poor), about 3.1× the cleanest month (December, 12 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	13	21	27	38	37	21	24	20	19	15	13	12
Level	Moderate	Moderate	Moderate	Poor	Poor	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	13	Moderate
Feb	21	Moderate
Mar	27	Moderate
Apr	38	Poor
May	37	Poor
Jun	21	Moderate
Jul	24	Moderate
Aug	20	Moderate
Sep	19	Moderate
Oct	15	Moderate
Nov	13	Moderate
Dec	12	Moderate

Location & terrain

Where is Chiapas?

Chiapas sits at 16.7°N, 93.0°W, 429 m above sea level, in Mexico. The nearest listed city is Tuxtla, 12 km away.

Topography around Chiapas

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

Within 3 km, the terrain around Chiapas has only modest variations in elevation — a maximum elevation change of 219 m around an average of 430 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,373 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,824 m.

The land around Chiapas is covered by grassland (38%) and trees (22%) within 3 km, grassland (35%), trees (30%) and shrubs (21%) within 16 km, and trees (57%) and grassland (33%) within 80 km.

3 km

219 m

grassland 38%

16 km

1,373 m

grassland 35%

80 km

2,824 m

trees 57%

treesshrubsgrasslandcroplandartificial surfaceswater

← August Chiapas year-round climate October →Best places to visit in September

September weather nearby: Tuxtla 12 km · Suchiapa 13 km · Berriozábal 30 km · Ocozocoautla de Espinosa 39 km · San Cristóbal de las Casas 40 km · Villaflores 59 km · Teopisca 60 km · Venustiano Carranza 63 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

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 Chiapas (16.7075°, -93.0122°, elevation 429 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).

	Avg high (°C)	Avg low (°C)
1	27	19
2	27	19
3	27	19
4	27	19
5	27	19
6	27	19
7	27	19
8	27	19
9	27	19
10	27	19
11	27	19
12	27	19
13	27	19
14	27	19
15	27	19
16	27	19
17	27	19
18	27	19
19	27	19
20	27	19
21	27	19
22	27	19
23	27	19
24	27	19
25	27	19
26	27	19
27	27	19
28	26	19
29	26	19
30	26	19

	Clearer (%)	Cloudier (%)
1	14	86
2	14	86
3	13	87
4	12	88
5	12	88
6	12	88
7	12	88
8	12	88
9	12	88
10	12	88
11	12	88
12	12	88
13	11	89
14	12	88
15	12	88
16	12	88
17	12	88
18	12	88
19	12	88
20	12	88
21	12	88
22	12	88
23	12	88
24	12	88
25	13	87
26	14	86
27	14	86
28	14	86
29	16	84
30	16	84

	Rain chance (%)
1	93
2	93
3	93
4	93
5	93
6	93
7	93
8	92
9	92
10	92
11	92
12	92
13	92
14	92
15	92
16	92
17	92
18	92
19	92
20	92
21	92
22	92
23	92
24	91
25	90
26	89
27	88
28	87
29	85
30	84

	Comfortable (%)	Humid (%)	Muggy (%)
1	0	6	94
2	0	5	95
3	0	5	95
4	1	5	94
5	1	5	94
6	1	5	94
7	1	5	94
8	1	6	93
9	1	6	93
10	1	6	93
11	1	6	93
12	1	6	93
13	1	6	93
14	1	6	93
15	0	6	94
16	0	5	95
17	0	5	95
18	0	5	95
19	0	6	94
20	0	6	94
21	0	6	94
22	0	7	93
23	0	8	92
24	0	9	91
25	0	9	91
26	0	10	90
27	1	11	88
28	1	12	87
29	1	13	86
30	1	14	85

	Avg high (°C)	Avg low (°C)
1	27	19
2	27	19
3	27	19
4	27	19
5	27	19
6	27	19
7	27	19
8	27	19
9	27	19
10	27	19
11	27	19
12	27	19
13	27	19
14	27	19
15	27	19
16	27	19
17	27	19
18	27	19
19	27	19
20	27	19
21	27	19
22	27	19
23	27	19
24	27	19
25	27	19
26	27	19
27	27	19
28	26	19
29	26	19
30	26	19

	Clearer (%)	Cloudier (%)
1	14	86
2	14	86
3	13	87
4	12	88
5	12	88
6	12	88
7	12	88
8	12	88
9	12	88
10	12	88
11	12	88
12	12	88
13	11	89
14	12	88
15	12	88
16	12	88
17	12	88
18	12	88
19	12	88
20	12	88
21	12	88
22	12	88
23	12	88
24	12	88
25	13	87
26	14	86
27	14	86
28	14	86
29	16	84
30	16	84

	Rain chance (%)
1	93
2	93
3	93
4	93
5	93
6	93
7	93
8	92
9	92
10	92
11	92
12	92
13	92
14	92
15	92
16	92
17	92
18	92
19	92
20	92
21	92
22	92
23	92
24	91
25	90
26	89
27	88
28	87
29	85
30	84

	Comfortable (%)	Humid (%)	Muggy (%)
1	0	6	94
2	0	5	95
3	0	5	95
4	1	5	94
5	1	5	94
6	1	5	94
7	1	5	94
8	1	6	93
9	1	6	93
10	1	6	93
11	1	6	93
12	1	6	93
13	1	6	93
14	1	6	93
15	0	6	94
16	0	5	95
17	0	5	95
18	0	5	95
19	0	6	94
20	0	6	94
21	0	6	94
22	0	7	93
23	0	8	92
24	0	9	91
25	0	9	91
26	0	10	90
27	1	11	88
28	1	12	87
29	1	13	86
30	1	14	85

	Avg high (°C)	Avg low (°C)
1	27	19
2	27	19
3	27	19
4	27	19
5	27	19
6	27	19
7	27	19
8	27	19
9	27	19
10	27	19
11	27	19
12	27	19
13	27	19
14	27	19
15	27	19
16	27	19
17	27	19
18	27	19
19	27	19
20	27	19
21	27	19
22	27	19
23	27	19
24	27	19
25	27	19
26	27	19
27	27	19
28	26	19
29	26	19
30	26	19

	Clearer (%)	Cloudier (%)
1	14	86
2	14	86
3	13	87
4	12	88
5	12	88
6	12	88
7	12	88
8	12	88
9	12	88
10	12	88
11	12	88
12	12	88
13	11	89
14	12	88
15	12	88
16	12	88
17	12	88
18	12	88
19	12	88
20	12	88
21	12	88
22	12	88
23	12	88
24	12	88
25	13	87
26	14	86
27	14	86
28	14	86
29	16	84
30	16	84

	Rain chance (%)
1	93
2	93
3	93
4	93
5	93
6	93
7	93
8	92
9	92
10	92
11	92
12	92
13	92
14	92
15	92
16	92
17	92
18	92
19	92
20	92
21	92
22	92
23	92
24	91
25	90
26	89
27	88
28	87
29	85
30	84

	Comfortable (%)	Humid (%)	Muggy (%)
1	0	6	94
2	0	5	95
3	0	5	95
4	1	5	94
5	1	5	94
6	1	5	94
7	1	5	94
8	1	6	93
9	1	6	93
10	1	6	93
11	1	6	93
12	1	6	93
13	1	6	93
14	1	6	93
15	0	6	94
16	0	5	95
17	0	5	95
18	0	5	95
19	0	6	94
20	0	6	94
21	0	6	94
22	0	7	93
23	0	8	92
24	0	9	91
25	0	9	91
26	0	10	90
27	1	11	88
28	1	12	87
29	1	13	86
30	1	14	85