Santa María Atzompa weather in September

In September, Santa María Atzompa sees average daytime highs of 24°C and overnight lows near 14°C, with 160 mm of rain across 17.2 wet days and about 12.1 hours of daylight. It is the 10th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 5% of the time in September, and the air most often feels comfortable.

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

Daytime high
24°
10th warmest
Overnight low
14°
11th coldest
Rainfall
160 mm
17.2 wet days
Daylight
12 h 06 min
6:19 AM – 6:24 PM
Cloud cover
83%
12th clearest
Wind
5 km/h
12th windiest
Solar energy
4.88 kWh/m²
Travel score
5.5
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical September day in Santa María Atzompa reaches about 24°C in the afternoon and slips back to 14°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 26°C. Set against its neighbours, September runs on par with August and on par with October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12414
22414
32414
42414
52414
62414
72414
82414
92414
102414
112414
122414
132414
142414
152414
162414
172414
182414
192414
202414
212414
222414
232414
242414
252414
262414
272414
282414
292414
302414

Santa María Atzompa weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 30.611.19.0
Feb26° / 10°51.111.48.8
Mar27° / 11°162.911.98.0
Apr28° / 13°29512.46.8
May27° / 14°739.312.86.5
Jun25° / 14°16317135.5
Jul25° / 14°10413.912.96.0
Aug25° / 14°12515.112.65.8
Sep24° / 14°16017.212.15.5
Oct24° / 13°718.711.67.0
Nov24° / 11°10211.28.5
Dec24° / 10°40.8119.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 5% 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 (%)
11783
21585
31585
41585
51585
61486
71486
81486
91486
101486
111486
121387
131387
141486
151486
161486
171486
181486
191486
201486
211486
221486
231585
241684
251684
261882
271882
281882
291981
302179

Chance of precipitation in September

Any precipitation

Santa María Atzompa gets around 160 mm of rain over 17.2 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 56% and peaks near 62% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
159
260
360
461
561
662
762
862
961
1061
1160
1259
1359
1458
1557
1657
1756
1856
1955
2054
2154
2253
2352
2451
2550
2649
2749
2848
2947
3046

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 68% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
128666
227676
326686
425696
524706
623707
722717
822717
921727
1021727
1121727
1221727
1322717
1422708
1522708
1622708
1723698
1823698
1923698
2024688
2125678
2225678
2326668
2427658
2528648
2629647
2730637
2831627
2932617
3033616

Wind in September

Winds average 5 km/h in September, the calmest month.

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

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 6:17 AM to 6:21 AM, and sunset from 6:37 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:176:37
212.36:176:36
312.36:176:35
412.36:176:35
512.36:176:34
612.36:176:33
712.26:176:32
812.26:186:31
912.26:186:30
1012.26:186:29
1112.26:186:29
1212.26:186:28
1312.16:186:27
1412.16:186:26
1512.16:186:25
1612.16:196:24
1712.16:196:23
1812.16:196:23
1912.06:196:22
2012.06:196:21
2112.06:196:20
2212.06:196:19
2312.06:196:18
2412.06:206:17
2511.96:206:17
2611.96:206:16
2711.96:206:15
2811.96:206:14
2911.96:206:13
3011.96:216:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.88 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.88 kWh/m² to a high of 7.09 kWh/m² in April across the year — September's 4.88 kWh/m² sits near the bottom.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Hazard calendar for Santa María Atzompa

In seasonPeak

In September, Santa María Atzompa sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Santa María Atzompa's rainy season runs June–September, when most of the year's rain falls.

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

Is September a good time to visit Santa María Atzompa?

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

5.5
Sightseeing
11th-best month of the year
4.8
Beach & pool
12th-best month of the year

September is a reasonable time to visit Santa María Atzompa for sightseeing.

What to pack for Santa María Atzompa in September

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

In September, Santa María Atzompa sees daytime highs around 24°C and nights near 14°C. Pack rain gear. Worth having: light clothes and sun protection. About 17 days see rain.

rain gearlight clothessun protection

UV index in Santa María Atzompa 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 Santa María Atzompa peaks around April 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 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 15Dec 15UV 9
UV index (midday)Level
Jan10Very high
Feb13Extreme
Mar14Extreme
Apr15Extreme
May12Extreme
Jun14Extreme
Jul13Extreme
Aug14Extreme
Sep13Extreme
Oct12Extreme
Nov9Very high
Dec9Very high

Air quality in Santa María Atzompa 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 Santa María Atzompa is worst in May — around 31 µg/m³ PM2.5 (moderate), about 3.7× the cleanest month (January, 8 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMay 1530 µg/m³Jan 118 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb11Good
Mar13Moderate
Apr21Moderate
May31Moderate
Jun17Moderate
Jul18Moderate
Aug14Moderate
Sep13Moderate
Oct10Good
Nov9Good
Dec9Good
Location & terrain

Where is Santa María Atzompa?

Santa María Atzompa sits at 17.1°N, 96.8°W, 1,597 m above sea level, in Mexico. The nearest listed city is Oaxaca, 7.0 km away.

Topography around Santa María Atzompa

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

Within 3 km, the terrain around Santa María Atzompa has significant variations in elevation — a maximum elevation change of 353 m around an average of 1,597 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,789 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,158 m.

The land around Santa María Atzompa is covered by artificial surfaces (42%) and grassland (26%) within 3 km, trees (38%) and grassland (25%) within 16 km, and trees (67%) within 80 km.

3 km
353 m
16 km
1,789 m
80 km
3,158 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Oaxaca 7.0 km · Santa Cruz Xoxocotlán 9.0 km · San Antonio de la Cal 11 km · Ocotlán de Morelos 36 km · Miahuatlán de Porfirio Díaz 88 km · Heroica Ciudad de Tlaxiaco 98 km · Tuxtepec 130 km · Ciudad de Huajuapan de León 132 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 Santa María Atzompa (17.1016°, -96.7769°, elevation 1,597 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).