San Buenaventura weather in September

In September, San Buenaventura sees average daytime highs of 31°C and overnight lows near 22°C, with 95 mm of rain across 10.6 wet days and about 12.2 hours of daylight. It is the 6th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 32°C in the first days to 30°C by the end. The sky is clear or mostly clear about 47% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 36 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is San Buenaventura's 12th-clearest and 8th-windiest month. For the whole year in context, see San Buenaventura's year-round climate.

Daytime high
31°
6th warmest
Overnight low
22°
9th coldest
Rainfall
95 mm
10.6 wet days
Daylight
12 h 12 min
6:36 AM – 6:45 PM
Cloud cover
47%
12th clearest
Wind
6 km/h
8th windiest
Solar energy
5.33 kWh/m²
Travel score
4.6
out of 10

San Buenaventura is municipal seat of San Buenaventura, State of Coahuila, Mexico.

Founded
1748

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 32°C in the first days to 30°C by the end.

A typical September day in San Buenaventura reaches about 31°C in the afternoon and slips back to 22°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 35°C. Set against its neighbours, September runs about 4°C cooler than August and about 3°C warmer than October.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13323
23323
33323
43223
53223
63223
73223
83222
93222
103122
113122
123122
133122
143122
153122
163122
173121
183121
193121
203121
213021
223021
233021
243020
253020
263020
273020
283020
293020
303020

How September really feels in San Buenaventura

Once humidity and wind are folded in, September averages 15 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
15
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.

San Buenaventura 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.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 153.210.57.6
Feb23° / 10°112.7118.2
Mar27° / 14°193.411.87.6
Apr31° / 18°194.212.65.2
May34° / 22°34813.33.4
Jun35° / 24°397.513.72.6
Jul35° / 24°597.813.52.8
Aug35° / 24°447.2133.0
Sep31° / 22°9510.612.24.6
Oct28° / 17°325.511.46.9
Nov24° / 12°173.510.78.3
Dec20° / 173.310.37.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 32%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16931
26931
36733
46733
56634
66634
76634
86535
96535
106535
116535
126535
136535
146535
156535
166634
176634
186634
196733
206832
216931
226931
237030
247129
257228
267426
277525
287525
297525
307624

Chance of precipitation in September

Any precipitation

San Buenaventura gets around 95 mm of rain over 10.6 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 34% and peaks near 40% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
134
235
336
437
538
639
740
840
940
1040
1140
1240
1339
1439
1538
1637
1736
1835
1934
2033
2132
2231
2329
2428
2527
2626
2725
2825
2924
3024

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 41% of days. Sticky, muggy-or-worse air turns up on roughly 57% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1210274219
2310254220
3310244320
4310234320
5310224421
6310224421
7310214521
8310214521
9310214521
1039214521
1139214521
1249214521
1349214520
14410224520
15410224419
16510234418
17510234318
18611244217
19711244116
20812244016
21913253915
221013253814
231114253613
241215253513
251316253512
261416253411
271517253310
28161725339
29171725329
30181824328

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 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
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 36 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 48 minutes over September. Sunrise moves from 6:29 AM to 6:42 AM, and sunset from 7:03 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:297:03
212.56:297:02
312.56:307:01
412.56:306:59
512.56:316:58
612.46:316:57
712.46:326:56
812.46:326:55
912.36:336:54
1012.36:336:52
1112.36:346:51
1212.36:346:50
1312.26:346:49
1412.26:356:48
1512.26:356:46
1612.26:366:45
1712.16:366:44
1812.16:376:43
1912.16:376:42
2012.06:386:40
2112.06:386:39
2212.06:396:38
2312.06:396:37
2411.96:396:36
2511.96:406:35
2611.96:406:33
2711.96:416:32
2811.86:416:31
2911.86:426:30
3011.86:426:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.33 kWh/m².

For context, solar energy here swings from a low near 3.64 kWh/m² to a high of 7.05 kWh/m² in June across the year — September's 5.33 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.7Bright
45.7Bright
55.6Bright
65.6Bright
75.5Bright
85.5Bright
95.5Bright
105.4Bright
115.4Bright
125.4Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.2Bright
305.2Bright
Planning a trip in September

Is September a good time to visit San Buenaventura?

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

4.6
Sightseeing
8th-best month of the year
6.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit San Buenaventura for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for San Buenaventura in September

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

In September, San Buenaventura sees daytime highs around 31°C and nights near 22°C. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in San Buenaventura in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San Buenaventura peaks around July 14 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighModerateJul 14UV 12Dec 17UV 5
UV index (midday)Level
Jan6High
Feb7High
Mar9Very high
Apr11Extreme
May11Extreme
Jun12Extreme
Jul12Extreme
Aug11Extreme
Sep10Extreme
Oct8Very high
Nov6High
Dec4Moderate

Air quality in San Buenaventura 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 San Buenaventura is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (January, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1617 µg/m³Jan 219 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb9Good
Mar9Good
Apr11Good
May15Moderate
Jun15Moderate
Jul18Moderate
Aug15Moderate
Sep14Moderate
Oct11Good
Nov10Good
Dec9Good
Location & terrain

Where is San Buenaventura?

San Buenaventura sits at 27.1°N, 101.5°W, 499 m above sea level, in Mexico. The nearest listed city is Frontera, 18 km away.

Topography around San Buenaventura

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

Within 3 km, the terrain around San Buenaventura has only modest variations in elevation — a maximum elevation change of 36 m around an average of 498 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 631 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,454 m.

The land around San Buenaventura is covered by shrubs (49%) and artificial surfaces (23%) within 3 km, shrubs (78%) within 16 km, and shrubs (90%) within 80 km.

3 km
36 m
16 km
631 m
80 km
2,454 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Frontera 18 km · Monclova 21 km · Castaños 32 km · Ciudad Melchor Múzquiz 91 km · Palaú 93 km · Sabinas 98 km · Nueva Rosita 103 km · Anáhuac 141 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 San Buenaventura (27.0619°, -101.5489°, elevation 499 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).