Matías Romero Avendaño weather in September

In September, Matías Romero Avendaño sees average daytime highs of 30°C and overnight lows near 23°C, with 239 mm of rain across 23.7 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 30°C through the month. The sky is clear or mostly clear about 4% of the time in September, and the air most often feels oppressive.

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

Daytime high
30°
7th warmest
Overnight low
23°
8th coldest
Rainfall
239 mm
23.7 wet days
Daylight
12 h 06 min
6:12 AM – 6:17 PM
Cloud cover
83%
12th clearest
Wind
11 km/h
12th windiest
Solar energy
4.6 kWh/m²
Travel score
3.3
out of 10

Matías Romero Avendaño is municipal seat of Matías Romero, State of Oaxaca, Mexico.

Density
13/km²
people per km²

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 30°C through the month.

A typical September day in Matías Romero Avendaño reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 32°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13023
23023
33023
43023
53023
63023
73023
83023
93023
103023
113023
123023
133023
143023
153023
163023
173023
183023
193023
203023
213023
223023
232922
242922
252922
262922
272922
282922
292922
302922

How September really feels in Matías Romero Avendaño

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Matías Romero Avendaño 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
Jan25° / 18°4710.911.16.7
Feb27° / 19°347.211.46.7
Mar30° / 20°286.411.95.6
Apr33° / 22°255.412.44.2
May33° / 23°6210.512.83.3
Jun32° / 23°19020.7132.9
Jul30° / 23°21125.312.93.0
Aug30° / 23°23126.412.63.0
Sep30° / 23°23923.712.13.3
Oct28° / 22°16819.311.64.5
Nov27° / 20°8714.411.25.8
Dec25° / 19°4710.8116.5

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 10% of September, with mostly cloudy or overcast conditions the remaining 85%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11585
21585
31585
41486
51387
61387
71387
81387
91387
101387
111486
121486
131486
141486
151486
161486
171486
181486
191585
201585
211684
221684
231585
241585
251585
261585
271684
281783
291783
301783

Chance of precipitation in September

Any precipitation

Matías Romero Avendaño gets around 239 mm of rain over 23.7 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 78% and peaks near 83% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
183
282
382
481
581
680
780
879
979
1078
1178
1277
1377
1477
1577
1677
1777
1877
1977
2077
2178
2278
2378
2477
2577
2677
2776
2875
2975
3074

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 89% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
101954
201954
301954
401954
501954
601945
701945
801936
902926
1002917
1102917
1202917
1302908
1402908
1502908
1602908
1702908
1803898
1903898
2004888
2104888
2215868
2316858
2417857
2518847
2629827
27210826
28211816
29212806
30213796

Wind in September

Winds average 11 km/h in September, the calmest month.

Across September, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3013light breeze

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 6:10 AM to 6:13 AM, and sunset from 6:30 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:106:30
212.36:106:29
312.36:106:28
412.36:106:27
512.36:106:27
612.36:106:26
712.26:116:25
812.26:116:24
912.26:116:23
1012.26:116:22
1112.26:116:22
1212.26:116:21
1312.16:116:20
1412.16:116:19
1512.16:126:18
1612.16:126:17
1712.16:126:16
1812.16:126:16
1912.06:126:15
2012.06:126:14
2112.06:126:13
2212.06:126:12
2312.06:136:11
2412.06:136:10
2511.96:136:10
2611.96:136:09
2711.96:136:08
2811.96:136:07
2911.96:136:06
3011.96:136:05

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.6 kWh/m².

For context, solar energy here swings from a low near 3.65 kWh/m² to a high of 6.42 kWh/m² in April across the year — September's 4.6 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.6Bright
194.6Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Matías Romero Avendaño

In seasonPeak

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

Matías Romero Avendaño'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 Matías Romero Avendaño?

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

3.3
Sightseeing
8th-best month of the year
4.5
Beach & pool
10th-best month of the year

September is a weaker month for outdoor sightseeing in Matías Romero Avendaño.

What to pack for Matías Romero Avendaño in September

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

In September, Matías Romero Avendaño sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

UV index in Matías Romero Avendaño 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 Matías Romero Avendaño peaks around August 16 at about 13 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 16UV 13Dec 18UV 8
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar12Extreme
Apr13Extreme
May12Extreme
Jun13Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Matías Romero Avendaño 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 Matías Romero Avendaño is worst in May — around 53 µg/m³ PM2.5 (poor), about 5.2× the cleanest month (January, 10 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateGoodMay 1650 µg/m³Jan 1510 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar16Moderate
Apr27Moderate
May53Poor
Jun26Moderate
Jul29Moderate
Aug22Moderate
Sep19Moderate
Oct13Moderate
Nov11Good
Dec11Good
Location & terrain

Where is Matías Romero Avendaño?

Matías Romero Avendaño sits at 16.9°N, 95.0°W, 186 m above sea level, in Mexico. The nearest listed city is Ixtepec, 36 km away.

Topography around Matías Romero Avendaño

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

Within 3 km, the terrain around Matías Romero Avendaño has only modest variations in elevation — a maximum elevation change of 92 m around an average of 205 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,088 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,304 m.

The land around Matías Romero Avendaño is covered by trees (46%) and grassland (38%) within 3 km, trees (62%) and grassland (36%) within 16 km, and trees (61%) and grassland (23%) within 80 km.

3 km
92 m
16 km
1,088 m
80 km
2,304 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Ixtepec 36 km · Heroica Ciudad de Juchitán de Zaragoza 49 km · Santo Domingo Tehuantepec 65 km · Salina Cruz 80 km · Acayucan 120 km · Jáltipan de Morelos 126 km · Cosoleacaque 132 km · Minatitlán 135 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 Matías Romero Avendaño (16.8774°, -95.0382°, elevation 186 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).