Ario de Rosales weather in September

In September, Ario de Rosales sees average daytime highs of 25°C and overnight lows near 15°C, with 418 mm of rain across 28.9 wet days and about 12.1 hours of daylight. It is the 9th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels humid.

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 Ario de Rosales's 12th-clearest and 10th-windiest month. For the whole year in context, see Ario de Rosales's year-round climate.

Daytime high
25°
9th warmest
Overnight low
15°
9th coldest
Rainfall
418 mm
28.9 wet days
Daylight
12 h 06 min
6:38 AM – 6:44 PM
Cloud cover
84%
12th clearest
Wind
5 km/h
10th windiest
Solar energy
4.48 kWh/m²
Travel score
3.7
out of 10

Ario de Rosales is municipal seat of Ario, State of Michoacán, Mexico.

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 25°C through the month.

A typical September day in Ario de Rosales reaches about 25°C in the afternoon and slips back to 15°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 23°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)
12516
22516
32516
42516
52516
62516
72516
82516
92516
102516
112516
122516
132516
142516
152516
162516
172516
182516
192515
202515
212515
222515
232515
242515
252515
262515
272515
282515
292515
302515

Ario de Rosales weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 161.9118.7
Feb25° / 10°121.311.38.8
Mar27° / 11°11111.98.5
Apr29° / 13°20.612.47.2
May29° / 15°469.812.95.8
Jun26° / 16°29825.813.14.1
Jul25° / 16°38830.3133.6
Aug25° / 16°43730.212.73.6
Sep25° / 15°41828.912.13.7
Oct25° / 14°18722.811.64.9
Nov25° / 12°407.311.17.7
Dec24° / 71.510.98.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 9% of September, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1892
2991
3892
4892
5892
6892
7892
8892
9892
10892
11892
12793
13892
14892
15892
16991
17991
18991
191090
201090
211189
221189
231288
241486
251585
261585
271783
281882
291981
301981

Chance of precipitation in September

Any precipitation

Ario de Rosales gets around 418 mm of rain over 28.9 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 96% and peaks near 98% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
198
297
397
497
597
697
797
896
996
1096
1196
1296
1396
1496
1596
1696
1796
1896
1996
2096
2196
2296
2396
2495
2595
2694
2793
2893
2992
3092

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 89% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
107921
207921
307921
407921
507921
608911
708911
808911
908911
1008911
1109901
1209901
1309901
1409901
1509901
1609901
1709901
1809901
1909901
2009901
2109892
2219882
23110872
24110872
25111862
26211852
27212842
28213832
29214822
30215812

Wind in September

Winds average 5 km/h in September.

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 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 6:35 AM to 6:41 AM, and sunset from 6:58 PM to 6:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:356:58
212.46:356:57
312.36:356:56
412.36:366:55
512.36:366:55
612.36:366:54
712.36:366:53
812.36:366:52
912.26:376:51
1012.26:376:50
1112.26:376:49
1212.26:376:48
1312.26:376:47
1412.16:386:46
1512.16:386:45
1612.16:386:44
1712.16:386:43
1812.16:386:43
1912.16:386:42
2012.06:396:41
2112.06:396:40
2212.06:396:39
2312.06:396:38
2412.06:396:37
2511.96:406:36
2611.96:406:35
2711.96:406:34
2811.96:406:33
2911.96:416:32
3011.86:416:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.48 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.48 kWh/m² to a high of 7.44 kWh/m² in April across the year — September's 4.48 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Ario de Rosales

In seasonPeak

In September, Ario de Rosales sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Ario de Rosales'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 Ario de Rosales?

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

3.7
Sightseeing
10th-best month of the year
3.3
Beach & pool
10th-best month of the year

September is a weaker month for outdoor sightseeing in Ario de Rosales.

What to pack for Ario de Rosales in September

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

In September, Ario de Rosales sees daytime highs around 25°C and nights near 15°C. Pack rain gear. Worth having: light clothes. About 29 days see rain.

rain gearlight clothes

UV index in Ario de Rosales in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ario de Rosales peaks around April 11 at about 13 (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 highApr 11UV 13Dec 15UV 7
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May13Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7Very high

Air quality in Ario de Rosales 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 Ario de Rosales is worst in May — around 32 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (February, 13 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMay 1031 µg/m³Feb 1613 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb13Moderate
Mar15Moderate
Apr31Moderate
May32Moderate
Jun17Moderate
Jul16Moderate
Aug15Moderate
Sep16Moderate
Oct15Moderate
Nov15Moderate
Dec18Moderate
Location & terrain

Where is Ario de Rosales?

Ario de Rosales sits at 19.2°N, 101.7°W, 1,868 m above sea level, in Mexico. The nearest listed city is Tacámbaro de Codallos, 27 km away.

Topography around Ario de Rosales

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

Within 3 km, the terrain around Ario de Rosales has significant variations in elevation — a maximum elevation change of 524 m around an average of 1,900 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,054 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,662 m.

The land around Ario de Rosales is covered by trees (67%) and grassland (21%) within 3 km, trees (75%) within 16 km, and trees (57%) and shrubs (20%) within 80 km.

3 km
524 m
16 km
2,054 m
80 km
3,662 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Tacámbaro de Codallos 27 km · Pátzcuaro 35 km · Uruapan 43 km · Nueva Italia de Ruiz 45 km · Paracho de Verduzco 60 km · Zacapu 68 km · Apatzingán 69 km · Morelia 78 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 Ario de Rosales (19.2083°, -101.709°, elevation 1,868 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).