Yajalón weather in September

In September, Yajalón sees average daytime highs of 28°C and overnight lows near 19°C, with 306 mm of rain across 27.6 wet days and about 12.1 hours of daylight. It is the 6th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 6% 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 Yajalón's 12th-clearest and 12th-windiest month. For the whole year in context, see Yajalón's year-round climate.

Daytime high: 28°; 6th warmest
Overnight low: 19°; 10th coldest
Rainfall: 306 mm; 27.6 wet days
Daylight: 12 h 06 min; 6:01 AM – 6:07 PM
Cloud cover: 80%; 12th clearest
Wind: 4 km/h; 12th windiest
Solar energy: 5.06 kWh/m²
Travel score: 3.4; out of 10

Yajalón is municipal seat of Yajalón, State of Chiapas, Mexico.

Founded: 1562

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

← August Yajalón 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 28°C through the month.

A typical September day in Yajalón reaches about 28°C in the afternoon and slips back to 19°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 30°C. Set against its neighbours, September runs about 1°C cooler than August and about 1°C warmer than 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)	29	29	29	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	27	27
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	29	19
2	29	19
3	29	19
4	28	19
5	28	19
6	28	19
7	28	19
8	28	19
9	28	19
10	28	19
11	28	19
12	28	19
13	28	19
14	28	19
15	28	19
16	28	19
17	28	19
18	28	19
19	28	19
20	28	19
21	28	19
22	28	19
23	28	19
24	28	19
25	28	19
26	28	19
27	28	19
28	28	19
29	27	19
30	27	19

Yajalón weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 1st-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	24° / 14°	150	13.8	11.1	6.5
Feb	26° / 15°	96	10.1	11.4	6.8
Mar	28° / 16°	83	9.3	11.9	6.6
Apr	30° / 18°	95	10.5	12.4	5.2
May	30° / 19°	156	16.9	12.8	4.1
Jun	29° / 20°	292	24.2	13	3.5
Jul	29° / 19°	182	20.9	12.9	4.0
Aug	29° / 19°	242	24.5	12.6	3.6
Sep	28° / 19°	306	27.6	12.1	3.4
Oct	27° / 19°	263	23.7	11.6	4.4
Nov	25° / 17°	194	16.6	11.2	5.7
Dec	24° / 15°	137	13.8	11	6.4

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 11% of September, with mostly cloudy or overcast conditions the remaining 83%.

	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 (%)	20	20	20	19	19	18	18	18	18	18	18	18	18	17	17	17	17	16	16	16	16	16	16	15	16	16	16	17	17	18
Cloudier (%)	80	80	80	81	81	82	82	82	82	82	82	82	82	83	83	83	83	84	84	84	84	84	84	85	84	84	84	83	83	82

	Clearer (%)	Cloudier (%)
1	20	80
2	20	80
3	20	80
4	19	81
5	19	81
6	18	82
7	18	82
8	18	82
9	18	82
10	18	82
11	18	82
12	18	82
13	18	82
14	17	83
15	17	83
16	17	83
17	17	83
18	16	84
19	16	84
20	16	84
21	16	84
22	16	84
23	16	84
24	15	85
25	16	84
26	16	84
27	16	84
28	17	83
29	17	83
30	18	82

Chance of precipitation in September

Any precipitation

Yajalón gets around 306 mm of rain over 27.6 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 91% and peaks near 92% on the wettest days.

	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 (%)	89	90	90	91	91	91	91	91	92	92	92	92	92	92	92	92	92	92	92	92	92	92	92	92	92	92	91	91	90	90

	Rain chance (%)
1	89
2	90
3	90
4	91
5	91
6	91
7	91
8	91
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	92
25	92
26	92
27	91
28	91
29	90
30	90

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 79% of days. Sticky, muggy-or-worse air turns up on roughly 98% 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
Humid (%)	2	2	2	2	2	2	2	2	2	2	1	1	1	1	1	1	1	1	1	1	1	1	1	2	2	3	3	4	4	5
Muggy (%)	79	80	80	80	80	81	81	80	80	80	81	80	80	79	79	79	78	78	78	78	78	78	78	78	78	78	78	78	78	78
Oppressive (%)	19	18	18	18	18	17	17	18	18	18	18	19	19	20	20	20	21	21	21	21	21	21	21	20	20	19	19	18	18	17

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	79	19
2	2	80	18
3	2	80	18
4	2	80	18
5	2	80	18
6	2	81	17
7	2	81	17
8	2	80	18
9	2	80	18
10	2	80	18
11	1	81	18
12	1	80	19
13	1	80	19
14	1	79	20
15	1	79	20
16	1	79	20
17	1	78	21
18	1	78	21
19	1	78	21
20	1	78	21
21	1	78	21
22	1	78	21
23	1	78	21
24	2	78	20
25	2	78	20
26	3	78	19
27	3	78	19
28	4	78	18
29	4	78	18
30	5	78	17

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.

	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	4	4	4	4	4	4
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	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	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 5:59 AM to 6:03 AM, and sunset from 6:19 PM to 5:55 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)	5:59	5:59	5:59	5:59	5:59	6:00	6:00	6:00	6:00	6:00	6:00	6:00	6:00	6:01	6:01	6:01	6:01	6:01	6:01	6:01	6:01	6:02	6:02	6:02	6:02	6:02	6:02	6:02	6:03	6:03
Sunset (PM)	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	6:01	6:00	6:00	5:59	5:58	5:57	5:56	5:55	5:55

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.3	5:59	6:19
2	12.3	5:59	6:18
3	12.3	5:59	6:18
4	12.3	5:59	6:17
5	12.3	5:59	6:16
6	12.3	6:00	6:15
7	12.2	6:00	6:14
8	12.2	6:00	6:13
9	12.2	6:00	6:13
10	12.2	6:00	6:12
11	12.2	6:00	6:11
12	12.2	6:00	6:10
13	12.1	6:00	6:09
14	12.1	6:01	6:08
15	12.1	6:01	6:07
16	12.1	6:01	6:07
17	12.1	6:01	6:06
18	12.1	6:01	6:05
19	12.0	6:01	6:04
20	12.0	6:01	6:03
21	12.0	6:01	6:02
22	12.0	6:02	6:01
23	12.0	6:02	6:00
24	12.0	6:02	6:00
25	11.9	6:02	5:59
26	11.9	6:02	5:58
27	11.9	6:02	5:57
28	11.9	6:02	5:56
29	11.9	6:03	5:55
30	11.9	6:03	5:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.06 kWh/m².

For context, solar energy here swings from a low near 4.06 kWh/m² to a high of 6.51 kWh/m² in April across the year — September's 5.06 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)	5.5	5.5	5.4	5.4	5.4	5.4	5.3	5.3	5.3	5.3	5.3	5.2	5.2	5.2	5.2	5.1	5.1	5.0	5.0	5.0	4.9	4.9	4.8	4.8	4.8	4.7	4.7	4.7	4.6	4.6
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	5.5	Bright
2	5.5	Bright
3	5.4	Bright
4	5.4	Bright
5	5.4	Bright
6	5.4	Bright
7	5.3	Bright
8	5.3	Bright
9	5.3	Bright
10	5.3	Bright
11	5.3	Bright
12	5.2	Bright
13	5.2	Bright
14	5.2	Bright
15	5.2	Bright
16	5.1	Bright
17	5.1	Bright
18	5.0	Bright
19	5.0	Bright
20	5.0	Bright
21	4.9	Bright
22	4.9	Bright
23	4.8	Bright
24	4.8	Bright
25	4.8	Bright
26	4.7	Bright
27	4.7	Bright
28	4.7	Bright
29	4.6	Bright
30	4.6	Bright

Planning a trip in September

Is September a good time to visit Yajalón?

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

3.4

Sightseeing

12th-best month of the year

3.9

Beach & pool

12th-best month of the year

September is a weaker month for outdoor sightseeing in Yajalón.

What to pack for Yajalón in September

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

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

light clothesrain gearsun protection

UV index in Yajalón 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 Yajalón peaks around April 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 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)	8	12	13	14	10	13	12	13	12	11	9	8
Level	Very high	Extreme	Extreme	Extreme	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

	UV index (midday)	Level
Jan	8	Very high
Feb	12	Extreme
Mar	13	Extreme
Apr	14	Extreme
May	10	Very high
Jun	13	Extreme
Jul	12	Extreme
Aug	13	Extreme
Sep	12	Extreme
Oct	11	Extreme
Nov	9	Very high
Dec	8	Very high

Air quality in Yajalón 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 Yajalón is worst in April — around 80 µg/m³ PM2.5 (unhealthy), about 6.5× 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	14	20	80	77	27	26	22	21	17	15	12
Level	Moderate	Moderate	Moderate	Unhealthy	Unhealthy	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	13	Moderate
Feb	14	Moderate
Mar	20	Moderate
Apr	80	Unhealthy
May	77	Unhealthy
Jun	27	Moderate
Jul	26	Moderate
Aug	22	Moderate
Sep	21	Moderate
Oct	17	Moderate
Nov	15	Moderate
Dec	12	Moderate

Location & terrain

Where is Yajalón?

Yajalón sits at 17.2°N, 92.3°W, 797 m above sea level, in Mexico. The nearest listed city is Ocosingo, 39 km away.

Topography around Yajalón

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

Within 3 km, the terrain around Yajalón has large variations in elevation — a maximum elevation change of 961 m around an average of 1,037 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,160 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,873 m.

The land around Yajalón is covered by trees (72%) and grassland (21%) within 3 km, trees (82%) within 16 km, and trees (68%) and grassland (30%) within 80 km.

3 km

961 m

trees 72%

16 km

2,160 m

trees 82%

80 km

2,873 m

trees 68%

treesgrasslandartificial surfaceswater

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

September weather nearby: Ocosingo 39 km · Palenque 53 km · San Cristóbal de las Casas 59 km · Macuspana 71 km · Teopisca 72 km · Teapa 78 km · Emiliano Zapata 87 km · Chiapas 89 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 Yajalón (17.1729°, -92.3339°, elevation 797 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	29	19
2	29	19
3	29	19
4	28	19
5	28	19
6	28	19
7	28	19
8	28	19
9	28	19
10	28	19
11	28	19
12	28	19
13	28	19
14	28	19
15	28	19
16	28	19
17	28	19
18	28	19
19	28	19
20	28	19
21	28	19
22	28	19
23	28	19
24	28	19
25	28	19
26	28	19
27	28	19
28	28	19
29	27	19
30	27	19

	Clearer (%)	Cloudier (%)
1	20	80
2	20	80
3	20	80
4	19	81
5	19	81
6	18	82
7	18	82
8	18	82
9	18	82
10	18	82
11	18	82
12	18	82
13	18	82
14	17	83
15	17	83
16	17	83
17	17	83
18	16	84
19	16	84
20	16	84
21	16	84
22	16	84
23	16	84
24	15	85
25	16	84
26	16	84
27	16	84
28	17	83
29	17	83
30	18	82

	Rain chance (%)
1	89
2	90
3	90
4	91
5	91
6	91
7	91
8	91
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	92
25	92
26	92
27	91
28	91
29	90
30	90

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	79	19
2	2	80	18
3	2	80	18
4	2	80	18
5	2	80	18
6	2	81	17
7	2	81	17
8	2	80	18
9	2	80	18
10	2	80	18
11	1	81	18
12	1	80	19
13	1	80	19
14	1	79	20
15	1	79	20
16	1	79	20
17	1	78	21
18	1	78	21
19	1	78	21
20	1	78	21
21	1	78	21
22	1	78	21
23	1	78	21
24	2	78	20
25	2	78	20
26	3	78	19
27	3	78	19
28	4	78	18
29	4	78	18
30	5	78	17

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

	Clearer (%)	Cloudier (%)
1	20	80
2	20	80
3	20	80
4	19	81
5	19	81
6	18	82
7	18	82
8	18	82
9	18	82
10	18	82
11	18	82
12	18	82
13	18	82
14	17	83
15	17	83
16	17	83
17	17	83
18	16	84
19	16	84
20	16	84
21	16	84
22	16	84
23	16	84
24	15	85
25	16	84
26	16	84
27	16	84
28	17	83
29	17	83
30	18	82

	Rain chance (%)
1	89
2	90
3	90
4	91
5	91
6	91
7	91
8	91
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	92
25	92
26	92
27	91
28	91
29	90
30	90

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	79	19
2	2	80	18
3	2	80	18
4	2	80	18
5	2	80	18
6	2	81	17
7	2	81	17
8	2	80	18
9	2	80	18
10	2	80	18
11	1	81	18
12	1	80	19
13	1	80	19
14	1	79	20
15	1	79	20
16	1	79	20
17	1	78	21
18	1	78	21
19	1	78	21
20	1	78	21
21	1	78	21
22	1	78	21
23	1	78	21
24	2	78	20
25	2	78	20
26	3	78	19
27	3	78	19
28	4	78	18
29	4	78	18
30	5	78	17

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

	Clearer (%)	Cloudier (%)
1	20	80
2	20	80
3	20	80
4	19	81
5	19	81
6	18	82
7	18	82
8	18	82
9	18	82
10	18	82
11	18	82
12	18	82
13	18	82
14	17	83
15	17	83
16	17	83
17	17	83
18	16	84
19	16	84
20	16	84
21	16	84
22	16	84
23	16	84
24	15	85
25	16	84
26	16	84
27	16	84
28	17	83
29	17	83
30	18	82

	Rain chance (%)
1	89
2	90
3	90
4	91
5	91
6	91
7	91
8	91
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	92
25	92
26	92
27	91
28	91
29	90
30	90

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	79	19
2	2	80	18
3	2	80	18
4	2	80	18
5	2	80	18
6	2	81	17
7	2	81	17
8	2	80	18
9	2	80	18
10	2	80	18
11	1	81	18
12	1	80	19
13	1	80	19
14	1	79	20
15	1	79	20
16	1	79	20
17	1	78	21
18	1	78	21
19	1	78	21
20	1	78	21
21	1	78	21
22	1	78	21
23	1	78	21
24	2	78	20
25	2	78	20
26	3	78	19
27	3	78	19
28	4	78	18
29	4	78	18
30	5	78	17