Bacalar weather in September

In September, Bacalar sees average daytime highs of 32°C and overnight lows near 24°C, with 165 mm of rain across 24.9 wet days and about 12.1 hours of daylight. It is the 5th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 18% 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 54 min by month's end. Set against the rest of the year, September is Bacalar's 11th-clearest and 12th-windiest month. For the whole year in context, see Bacalar's year-round climate.

Daytime high
32°
5th warmest
Overnight low
24°
8th coldest
Rainfall
165 mm
24.9 wet days
Daylight
12 h 06 min
5:45 AM – 5:51 PM
Cloud cover
70%
11th clearest
Wind
7 km/h
12th windiest
Solar energy
5.08 kWh/m²
Travel score
2.5
out of 10

Bacalar is city of Quintana Roo State, Mexico.

Founded
1545

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 32°C through the month.

A typical September day in Bacalar reaches about 32°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 34°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13324
23324
33324
43324
53324
63324
73324
83324
93324
103224
113224
123224
133224
143224
153224
163224
173224
183224
193224
203224
213224
223224
233224
243224
253224
263224
273224
283224
293224
303224

How September really feels in Bacalar

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
27 feel dangerously hot (≥ 39°C)
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.

Bacalar weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 20°379.8116.1
Feb30° / 20°195.711.45.8
Mar31° / 21°235.311.95.2
Apr33° / 23°356.612.44.2
May33° / 24°8514.312.93.2
Jun32° / 25°17521.413.12.9
Jul32° / 25°10620.1133.0
Aug33° / 24°14522.412.62.7
Sep32° / 24°16524.912.12.5
Oct31° / 23°15220.611.63.5
Nov29° / 21°7212.911.15.0
Dec29° / 20°3910.410.95.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34159
44060
53961
63961
73961
83862
93862
103862
113862
123763
133763
143664
153565
163565
173565
183565
193466
203466
213268
223268
233268
243268
253268
263268
273070
283070
293070
303070

Chance of precipitation in September

Any precipitation

Bacalar gets around 165 mm of rain over 24.9 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 82% and peaks near 85% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
179
279
379
480
580
680
780
880
980
1080
1180
1281
1381
1481
1582
1682
1783
1884
1984
2085
2185
2285
2385
2485
2585
2685
2784
2884
2983
3083

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 83% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
101783
201684
301684
401684
501684
601684
701684
801684
901684
1001684
1101684
1201783
1301783
1401783
1501882
1601882
1701882
1801882
1901783
2001783
2101783
2201783
2301783
2411782
2511782
2611782
2711881
2821880
2921880
3021880

Wind in September

Winds average 7 km/h in September, the calmest month.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over September. Sunrise moves from 5:42 AM to 5:47 AM, and sunset from 6:04 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:426:04
212.45:426:04
312.35:426:03
412.35:436:02
512.35:436:01
612.35:436:00
712.35:435:59
812.25:435:58
912.25:445:57
1012.25:445:57
1112.25:445:56
1212.25:445:55
1312.25:445:54
1412.15:445:53
1512.15:455:52
1612.15:455:51
1712.15:455:50
1812.15:455:49
1912.15:455:48
2012.05:455:47
2112.05:465:46
2212.05:465:46
2312.05:465:45
2412.05:465:44
2511.95:465:43
2611.95:475:42
2711.95:475:41
2811.95:475:40
2911.95:475:39
3011.95:475:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.08 kWh/m².

For context, solar energy here swings from a low near 3.8 kWh/m² to a high of 6.1 kWh/m² in April across the year — September's 5.08 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.1Bright
165.1Bright
175.0Bright
185.0Bright
195.0Bright
204.9Bright
214.9Bright
224.8Bright
234.8Bright
244.8Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.6Bright
304.6Bright
Planning a trip in September

Hazard calendar for Bacalar

In seasonPeak

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

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

Bacalar's rainy season runs May–October, 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 Bacalar?

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

2.5
Sightseeing
12th-best month of the year
4.1
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Bacalar.

What to pack for Bacalar in September

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

In September, Bacalar sees daytime highs around 32°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

Sea temperature near Bacalar in September

The nearest coast averages about 30°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 29 km away) is warmest in September at about 30°C and coldest in January near 26°C.

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

24°26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar27Warm
Apr28Warm
May29Tropical
Jun29Tropical
Jul29Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov28Warm
Dec27Warm

UV index in Bacalar 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 Bacalar peaks around April 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 12UV 13Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar12Extreme
Apr13Extreme
May11Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct10Extreme
Nov8Very high
Dec7High

Air quality in Bacalar 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 Bacalar is worst in June — around 30 µg/m³ PM2.5 (moderate), about 4.5× the cleanest month (December, 7 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 2130 µg/m³Dec 157 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb10Good
Mar11Good
Apr19Moderate
May24Moderate
Jun30Moderate
Jul29Moderate
Aug21Moderate
Sep15Moderate
Oct10Good
Nov7Good
Dec7Good
Location & terrain

Where is Bacalar?

Bacalar sits at 18.7°N, 88.4°W, 0 m above sea level, in Mexico. The nearest listed city is Chetumal, 20 km away.

Topography around Bacalar

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

Within 3 km, the terrain around Bacalar has only modest variations in elevation — a maximum elevation change of 27 m around an average of 10 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 64 m; within 80 km, only modest variations in elevation — a maximum elevation change of 229 m.

The land around Bacalar is covered by trees (41%) and water (33%) within 3 km, trees (72%) within 16 km, and trees (64%) within 80 km.

3 km
27 m
16 km
64 m
80 km
229 m
treesgrasslandcroplandartificial surfaceswaterwetlandmangroves
September weather nearby: Chetumal 20 km · Orange Walk 69 km · San Pedro 96 km · Crooked Tree 102 km · Felipe Carrillo Puerto 106 km · Caye Caulker 112 km · Belize City 133 km · Belmopan 163 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 Bacalar (18.6811°, -88.3933°, 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).