Atotonilco el Alto weather in September

In September, Atotonilco el Alto sees average daytime highs of 27°C and overnight lows near 15°C, with 150 mm of rain across 18.9 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 3rd-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 14% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Atotonilco el Alto's 12th-clearest and 9th-windiest month. For the whole year in context, see Atotonilco el Alto's year-round climate.

Daytime high
27°
8th warmest
Overnight low
15°
9th coldest
Rainfall
150 mm
18.9 wet days
Daylight
12 h 06 min
6:41 AM – 6:48 PM
Cloud cover
70%
12th clearest
Wind
6 km/h
9th windiest
Solar energy
5.38 kWh/m²
Travel score
5.0
out of 10

Atotonilco el Alto is municipal seat of Atotonilco, State of Jalisco, Mexico.

Density
4,134/km²
people per km²
Founded
1530

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 27°C through the month.

A typical September day in Atotonilco el Alto reaches about 27°C in the afternoon and slips back to 15°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 29°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)
12716
22716
32716
42716
52716
62716
72716
82716
92716
102716
112716
122716
132716
142716
152716
162716
172716
182715
192715
202715
212715
222715
232715
242715
252715
262715
272715
282715
292715
302715

Atotonilco el Alto weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 141.810.98.7
Feb26° / 10°91.311.38.6
Mar28° / 11°70.911.97.8
Apr30° / 13°40.912.56.1
May32° / 15°265.1134.9
Jun30° / 17°14518.313.24.1
Jul27° / 16°20324.413.14.4
Aug27° / 16°17622.412.74.6
Sep27° / 15°15018.912.15.0
Oct27° / 14°498.411.56.8
Nov26° / 11°112.2118.4
Dec24° / 5110.88.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 67%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12971
22872
32872
42872
52872
62971
72971
82971
93070
103070
113169
123367
133466
143565
153565
163664
173664
183664
193664
203565
213565
223664
233664
243763
253664
263763
273763
283763
293862
303961

Chance of precipitation in September

Any precipitation

Atotonilco el Alto gets around 150 mm of rain over 18.9 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 62% and peaks near 74% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
174
273
373
472
571
671
770
869
968
1068
1167
1266
1365
1465
1564
1663
1762
1861
1960
2059
2158
2257
2356
2455
2553
2652
2751
2850
2948
3047

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 49% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
184448
284448
384448
484547
584646
684646
784745
884844
984943
1094942
1195041
1295140
13105139
14105139
15115138
16115237
17125236
18125335
19135334
20155233
21165232
22185131
23195130
24214929
25234928
26254826
27274825
28294824
29304822
30314821

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 5 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
15calm
25calm
35calm
45calm
55calm
65calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 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 36 minutes over September. Sunrise moves from 6:37 AM to 6:44 AM, and sunset from 7:02 PM to 6:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:377:02
212.46:387:01
312.46:387:00
412.46:386:59
512.36:386:58
612.36:396:57
712.36:396:57
812.36:396:56
912.36:396:55
1012.26:406:54
1112.26:406:53
1212.26:406:52
1312.26:406:51
1412.26:406:50
1512.16:416:49
1612.16:416:48
1712.16:416:47
1812.16:416:46
1912.16:426:45
2012.06:426:44
2112.06:426:43
2212.06:426:42
2312.06:436:41
2412.06:436:40
2511.96:436:39
2611.96:436:38
2711.96:446:37
2811.96:446:36
2911.96:446:35
3011.86:446:34

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.38 kWh/m².

For context, solar energy here swings from a low near 4.82 kWh/m² to a high of 7.55 kWh/m² in April across the year — September's 5.38 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in September

Hazard calendar for Atotonilco el Alto

In seasonPeak

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

Atotonilco el Alto's monsoon runs June–September, 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 Atotonilco el Alto?

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

5.0
Sightseeing
8th-best month of the year
5.1
Beach & pool
10th-best month of the year

September is a reasonable time to visit Atotonilco el Alto for sightseeing.

What to pack for Atotonilco el Alto in September

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

In September, Atotonilco el Alto sees daytime highs around 27°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 19 days see rain.

rain gearlight clothessun protection

UV index in Atotonilco el Alto 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 Atotonilco el Alto peaks around May 21 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highMay 21UV 14Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May14Extreme
Jun14Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct10Extreme
Nov8Very high
Dec7Very high

Air quality in Atotonilco el Alto 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 Atotonilco el Alto is worst in May — around 32 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (July, 15 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMay 1032 µg/m³Jul 2015 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb20Moderate
Mar21Moderate
Apr31Moderate
May32Moderate
Jun17Moderate
Jul15Moderate
Aug16Moderate
Sep18Moderate
Oct18Moderate
Nov20Moderate
Dec25Moderate
Location & terrain

Where is Atotonilco el Alto?

Atotonilco el Alto sits at 20.6°N, 102.5°W, 1,604 m above sea level, in Mexico. The nearest listed city is Arandas, 24 km away.

Topography around Atotonilco el Alto

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

Within 3 km, the terrain around Atotonilco el Alto has significant variations in elevation — a maximum elevation change of 378 m around an average of 1,718 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 575 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,730 m.

The land around Atotonilco el Alto is covered by trees (41%) within 3 km, cropland (43%) and trees (31%) within 16 km, and cropland (37%) and grassland (20%) within 80 km.

3 km
378 m
16 km
575 m
80 km
1,730 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Arandas 24 km · La Barca 29 km · Yurécuaro 33 km · Ocotlán 35 km · Jamay 35 km · Tepatitlán de Morelos 40 km · San Miguel el Alto 54 km · La Piedad de Cabadas 56 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 Atotonilco el Alto (20.5508°, -102.5082°, elevation 1,604 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).