El Grullo weather in September

In September, El Grullo sees average daytime highs of 28°C and overnight lows near 18°C, with 216 mm of rain across 26 wet days and about 12.1 hours of daylight. It is the 10th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 5% of the time in September, and the air most often feels muggy.

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

Daytime high
28°
10th warmest
Overnight low
18°
11th coldest
Rainfall
216 mm
26 wet days
Daylight
12 h 06 min
6:48 AM – 6:55 PM
Cloud cover
79%
12th clearest
Wind
4 km/h
10th windiest
Solar energy
4.7 kWh/m²
Travel score
3.9
out of 10

El Grullo is municipal seat of El Grullo, State of Jalisco, Mexico.

Density
3,487/km²
people per km²
Founded
1830

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 28°C through the month.

A typical September day in El Grullo reaches about 28°C in the afternoon and slips back to 18°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12718
22718
32718
42718
52718
62718
72718
82718
92718
102718
112718
122718
132718
142718
152818
162818
172818
182818
192818
202818
212818
222818
232818
242818
252818
262818
272818
282818
292818
302818

How September really feels in El Grullo

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

El Grullo weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 12°27210.98.1
Feb28° / 12°211.711.37.5
Mar30° / 13°121.311.96.6
Apr31° / 14°5112.45.5
May32° / 17°215.312.94.7
Jun29° / 19°16321.913.23.8
Jul28° / 18°20228.413.13.6
Aug28° / 18°21128.612.73.6
Sep28° / 18°2162612.13.9
Oct28° / 17°9915.111.55.5
Nov28° / 15°244.211.17.4
Dec27° / 12°141.810.88.0

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 13% of September, with mostly cloudy or overcast conditions the remaining 82%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11585
21585
31585
41585
51585
61585
71585
81585
91585
101684
111684
121684
131684
141684
151684
161684
171684
181684
191783
201783
211882
221981
231981
242080
252278
262278
272476
282575
292773
302872

Chance of precipitation in September

Any precipitation

El Grullo gets around 216 mm of rain over 26 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 86% and peaks near 92% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
192
292
391
491
590
690
790
889
989
1088
1188
1288
1387
1487
1587
1687
1787
1886
1986
2086
2185
2284
2383
2482
2581
2679
2778
2876
2975
3074

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 80% of days. Sticky, muggy-or-worse air turns up on roughly 80% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)
101882
201882
301882
401783
501783
601783
701783
801783
901783
1001783
1101783
1201783
1301783
1401783
1501783
1601783
1701882
1801882
1901882
2001882
2101981
2212079
2312079
2412178
2512277
2612376
2722474
2822573
2922672
3022771

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

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 6:45 AM to 6:51 AM, and sunset from 7:08 PM to 6:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:457:08
212.46:457:08
312.46:457:07
412.36:457:06
512.36:467:05
612.36:467:04
712.36:467:03
812.36:467:02
912.26:467:01
1012.26:477:00
1112.26:476:59
1212.26:476:58
1312.26:476:57
1412.16:476:56
1512.16:486:55
1612.16:486:55
1712.16:486:54
1812.16:486:53
1912.16:486:52
2012.06:496:51
2112.06:496:50
2212.06:496:49
2312.06:496:48
2412.06:506:47
2511.96:506:46
2611.96:506:45
2711.96:506:44
2811.96:506:43
2911.96:516:42
3011.86:516:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.7 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.7 kWh/m² to a high of 7.46 kWh/m² in April across the year — September's 4.7 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.7Bright
84.7Bright
94.7Bright
104.7Bright
114.7Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.7Bright
174.7Bright
184.7Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Hazard calendar for El Grullo

In seasonPeak

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

El Grullo's monsoon runs June–October, 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 El Grullo?

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

3.9
Sightseeing
9th-best month of the year
4.1
Beach & pool
10th-best month of the year

September is a weaker month for outdoor sightseeing in El Grullo.

What to pack for El Grullo in September

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

In September, El Grullo sees daytime highs around 28°C and nights near 18°C. Pack light clothes and rain gear. Worth having: sun protection. About 26 days see rain.

light clothesrain gearsun protection

UV index in El Grullo 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 El Grullo peaks around April 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highApr 22UV 13Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May13Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in El Grullo 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 El Grullo is worst in May — around 48 µg/m³ PM2.5 (poor), about 5.2× the cleanest month (February, 9 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateGoodMay 1745 µg/m³Feb 109 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb9Good
Mar10Good
Apr20Moderate
May48Poor
Jun20Moderate
Jul12Good
Aug10Good
Sep10Good
Oct10Good
Nov10Good
Dec10Good
Location & terrain

Where is El Grullo?

El Grullo sits at 19.8°N, 104.2°W, 853 m above sea level, in Mexico. The nearest listed city is Autlán de Navarro, 16 km away.

Topography around El Grullo

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

Within 3 km, the terrain around El Grullo has significant variations in elevation — a maximum elevation change of 423 m around an average of 914 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,342 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,211 m.

The land around El Grullo is covered by cropland (37%) and trees (34%) within 3 km, trees (39%) and shrubs (25%) within 16 km, and trees (65%) within 80 km.

3 km
423 m
16 km
1,342 m
80 km
4,211 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Autlán de Navarro 16 km · Sayula 65 km · El Salto 66 km · Cihuatlán 73 km · Cocula 75 km · Manzanillo 78 km · Ciudad de Villa de Álvarez 78 km · Ciudad Guzmán 80 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 El Grullo (19.8067°, -104.2163°, elevation 853 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).