Isla Mujeres weather in September

In September, Isla Mujeres sees average daytime highs of 28°C and overnight lows near 27°C, with 164 mm of rain across 20 wet days and about 12.1 hours of daylight. It is the 2nd-warmest and 2nd-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 33% of the time in September, and the air most often feels miserable.

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 Isla Mujeres's 12th-clearest and 11th-windiest month. For the whole year in context, see Isla Mujeres's year-round climate.

Daytime high
28°
2nd warmest
Overnight low
27°
10th coldest
Rainfall
164 mm
20 wet days
Daylight
12 h 06 min
5:38 AM – 5:45 PM
Cloud cover
58%
12th clearest
Wind
18 km/h
11th windiest
Solar energy
5.39 kWh/m²
Travel score
4.5
out of 10

Isla Mujeres is municipal seat of Isla Mujeres, State of Quintana Roo, Mexico.

Founded
1850

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 Isla Mujeres reaches about 28°C in the afternoon and slips back to 27°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

24°26°28°30°32°151015202530
Avg high (°C)Avg low (°C)
12927
22927
32927
42927
52927
62927
72927
82927
92927
102927
112927
122927
132927
142827
152827
162827
172827
182827
192827
202827
212827
222827
232827
242827
252827
262827
272827
282827
292826
302826

How September really feels in Isla Mujeres

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Isla Mujeres weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 24°6510.110.97.1
Feb25° / 24°356.911.37.6
Mar26° / 24°244.911.88.0
Apr26° / 25°254.712.57.9
May27° / 26°669.1136.9
Jun28° / 27°13115.613.35.5
Jul28° / 27°6611.213.25.8
Aug29° / 27°9114.612.75.3
Sep28° / 27°1642012.14.5
Oct28° / 26°1901911.55.1
Nov27° / 25°9011.6116.5
Dec26° / 24°6211.810.76.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% 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 49%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25446
35347
45347
55347
65347
75347
85347
95347
105347
115347
125347
135248
145248
155149
165149
175149
185050
195149
205050
215050
225050
235050
245050
255050
264951
274852
284852
294951
304852

Chance of precipitation in September

Any precipitation

Isla Mujeres gets around 164 mm of rain over 20 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 66% and peaks near 73% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
159
259
360
460
561
661
761
862
962
1062
1163
1263
1364
1465
1566
1667
1768
1869
1970
2070
2171
2271
2372
2472
2573
2673
2773
2873
2972
3072

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 84% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
101090
201090
301189
401189
501189
601189
701189
801189
901189
1001189
1101189
1201288
1301288
1401387
1501486
1601486
1701585
1801684
1901684
2001783
2101882
2201981
2312079
2412178
2512277
2612376
2722474
2822474
2922573
3032572

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze

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 5:34 AM to 5:41 AM, and sunset from 5:59 PM to 5:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:345:59
212.45:345:59
312.45:345:58
412.45:355:57
512.35:355:56
612.35:355:55
712.35:355:54
812.35:365:53
912.35:365:52
1012.25:365:51
1112.25:365:50
1212.25:375:49
1312.25:375:48
1412.25:375:47
1512.15:375:46
1612.15:385:45
1712.15:385:44
1812.15:385:43
1912.15:385:42
2012.05:395:41
2112.05:395:40
2212.05:395:39
2312.05:395:38
2412.05:405:37
2511.95:405:36
2611.95:405:35
2711.95:415:34
2811.95:415:33
2911.85:415:32
3011.85:415:31

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.39 kWh/m².

For context, solar energy here swings from a low near 3.7 kWh/m² to a high of 6.59 kWh/m² in July across the year — September's 5.39 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.7Bright
75.7Bright
85.7Bright
95.6Bright
105.6Bright
115.6Bright
125.5Bright
135.5Bright
145.5Bright
155.4Bright
165.4Bright
175.3Bright
185.3Bright
195.3Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.1Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.9Bright
Planning a trip in September

Hazard calendar for Isla Mujeres

In seasonPeak

In September, Isla Mujeres sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.

Isla Mujeres sits in the Atlantic hurricane belt; the season peaks August–October.

Isla Mujeres's rainy season runs August–November, when most of the year's rain falls.

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

Is September a good time to visit Isla Mujeres?

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

4.5
Sightseeing
12th-best month of the year
5.4
Beach & pool
12th-best month of the year

September is a reasonable time to visit Isla Mujeres for sightseeing.

What to pack for Isla Mujeres in September

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

In September, Isla Mujeres sees daytime highs around 28°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

Sea temperature near Isla Mujeres in September

The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in September at about 29°C and coldest in February near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb26Warm
Mar26Warm
Apr27Warm
May28Warm
Jun28Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Isla Mujeres 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 Isla Mujeres peaks around July 19 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighJul 19UV 12Dec 16UV 6
UV index (midday)Level
Jan7High
Feb9Very high
Mar11Extreme
Apr12Extreme
May11Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep11Extreme
Oct10Very high
Nov7High
Dec6High

Air quality in Isla Mujeres 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 Isla Mujeres is worst in June — around 25 µg/m³ PM2.5 (moderate), about 4.1× the cleanest month (November, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 2024 µg/m³Nov 226 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb7Good
Mar8Good
Apr12Good
May15Moderate
Jun25Moderate
Jul22Moderate
Aug18Moderate
Sep12Moderate
Oct9Good
Nov6Good
Dec6Good
Location & terrain

Where is Isla Mujeres?

Isla Mujeres sits at 21.2°N, 86.7°W, 0 m above sea level, in Mexico. The nearest listed city is Cancun, 14 km away.

Chichen ItzaFelipe Carrillo Puerto

Topography around Isla Mujeres

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

Within 3 km, the terrain around Isla Mujeres has only modest variations in elevation — a maximum elevation change of 23 m around an average of 1 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 30 m; within 80 km, only modest variations in elevation — a maximum elevation change of 30 m.

The land around Isla Mujeres is covered by water (90%) within 3 km, water (84%) within 16 km, and water (58%) and trees (35%) within 80 km.

3 km
23 m
16 km
30 m
80 km
30 m
treesgrasslandartificial surfaceswaterwetlandmangroves
September weather nearby: Cancun 14 km · Playa del Carmen 76 km · Cozumel 84 km · Tulum 137 km · Tizimín 148 km · Valladolid 164 km · Chichen Itza 201 km · Felipe Carrillo Puerto 229 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 Isla Mujeres (21.2311°, -86.731°, elevation 0 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).