Guanajuato weather in September

In September, Guanajuato sees average daytime highs of 25°C and overnight lows near 14°C, with 131 mm of rain across 14.4 wet days and about 12.1 hours of daylight. It is the 7th-warmest and 4th-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 20% 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 Guanajuato's 12th-clearest and 4th-windiest month. For the whole year in context, see Guanajuato's year-round climate.

Daytime high
25°
7th warmest
Overnight low
14°
8th coldest
Rainfall
131 mm
14.4 wet days
Daylight
12 h 06 min
6:36 AM – 6:43 PM
Cloud cover
66%
12th clearest
Wind
10 km/h
4th windiest
Solar energy
5.53 kWh/m²
Travel score
6.1
out of 10

Guanajuato is capital city of the State of Guanajuato, Mexico.

Density
72/km²
people per km²
Founded
1546

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 Guanajuato reaches about 25°C in the afternoon and slips back to 14°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 27°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12514
22514
32514
42514
52514
62514
72514
82514
92514
102514
112514
122514
132514
142514
152514
162514
172514
182514
192514
202514
212514
222514
232514
242514
252514
262514
272513
282513
292513
302513

Guanajuato weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 132.410.98.1
Feb24° / 13211.38.6
Mar26° / 11°132.211.98.3
Apr29° / 13°14312.56.9
May29° / 15°488.5135.8
Jun28° / 15°13314.313.35.5
Jul26° / 14°16017.713.15.6
Aug26° / 14°14115.912.75.8
Sep25° / 14°13114.412.16.1
Oct25° / 12°47711.57.5
Nov24° / 10°132.5118.6
Dec22° / 61.410.78.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 62%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13763
23763
33664
43664
53664
63664
73664
83565
93565
103664
113664
123664
133664
143664
153763
163763
173763
183763
193763
203763
213961
223862
233961
243961
254159
264258
274258
284456
294456
304555

Chance of precipitation in September

Any precipitation

Guanajuato gets around 131 mm of rain over 14.4 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 47% and peaks near 56% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
155
255
355
455
556
656
756
856
955
1055
1154
1254
1353
1452
1551
1650
1749
1848
1946
2045
2143
2242
2340
2438
2537
2635
2734
2833
2932
3032

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 (%)
136577
236577
336577
436577
536568
636568
736568
836568
936568
1037558
1137549
1238539
1339529
1440519
1540519
1641509
1742508
1843498
1944488
2046477
2147467
2249456
2350446
2453425
2554415
2655405
2757394
2858384
2960373
3061363

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 6:32 AM to 6:39 AM, and sunset from 6:57 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:326:57
212.46:326:57
312.46:336:56
412.46:336:55
512.36:336:54
612.36:336:53
712.36:346:52
812.36:346:51
912.36:346:50
1012.26:346:49
1112.26:356:48
1212.26:356:47
1312.26:356:46
1412.26:356:45
1512.16:366:44
1612.16:366:43
1712.16:366:42
1812.16:366:41
1912.16:376:40
2012.06:376:39
2112.06:376:38
2212.06:376:37
2312.06:386:36
2412.06:386:35
2511.96:386:34
2611.96:386:33
2711.96:396:32
2811.96:396:31
2911.96:396:30
3011.86:396:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.53 kWh/m².

For context, solar energy here swings from a low near 4.82 kWh/m² to a high of 7.54 kWh/m² in April across the year — September's 5.53 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.6Bright
95.6Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.4Bright
Planning a trip in September

Hazard calendar for Guanajuato

In seasonPeak

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

Guanajuato'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 Guanajuato?

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

6.1
Sightseeing
8th-best month of the year
5.4
Beach & pool
10th-best month of the year

September is a reasonable time to visit Guanajuato for sightseeing.

What to pack for Guanajuato in September

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

In September, Guanajuato sees daytime highs around 25°C and nights near 14°C. Pack rain gear. Worth having: light clothes and sun protection. About 14 days see rain.

rain gearlight clothessun protection

UV index in Guanajuato 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 Guanajuato peaks around June 12 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 highJun 12UV 14Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar13Extreme
Apr14Extreme
May13Extreme
Jun14Extreme
Jul12Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov8Very high
Dec7Very high

Air quality in Guanajuato 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 Guanajuato is worst in May — around 21 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMay 1521 µg/m³Oct 1614 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb17Moderate
Mar17Moderate
Apr17Moderate
May21Moderate
Jun15Moderate
Jul17Moderate
Aug15Moderate
Sep16Moderate
Oct13Moderate
Nov16Moderate
Dec20Moderate
Location & terrain

Where is Guanajuato?

Guanajuato sits at 21.0°N, 101.3°W, 2,010 m above sea level, in Mexico. The nearest listed city is Marfil, 4.0 km away.

Topography around Guanajuato

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

Within 3 km, the terrain around Guanajuato has significant variations in elevation — a maximum elevation change of 488 m around an average of 2,135 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,169 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,273 m.

The land around Guanajuato is covered by shrubs (49%) and artificial surfaces (25%) within 3 km, shrubs (44%), trees (23%) and grassland (21%) within 16 km, and shrubs (39%) and cropland (34%) within 80 km.

3 km
488 m
16 km
1,169 m
80 km
1,273 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Marfil 4.0 km · Silao de la Victoria 19 km · Romita 31 km · Dolores Hidalgo 37 km · Irapuato 40 km · Medina 40 km · León de los Aldama 45 km · Juventino Rosas 50 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 Guanajuato (21.0186°, -101.2591°, elevation 2,010 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).