Umán weather in December

In December, Umán sees average daytime highs of 29°C and overnight lows near 19°C, with 23 mm of rain across 4.3 wet days and about 10.8 hours of daylight. It is the 11th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 45% of the time in December, and the air most often feels muggy.

Daylight stretches from about 10 h 48 min at the start of December to 10 h 42 min by month's end. Set against the rest of the year, December is Umán's 5th-clearest and 7th-windiest month. For the whole year in context, see Umán's year-round climate.

Daytime high
29°
11th warmest
Overnight low
19°
3rd coldest
Rainfall
23 mm
4.3 wet days
Daylight
10 h 42 min
6:33 AM – 5:17 PM
Cloud cover
46%
5th clearest
Wind
10 km/h
7th windiest
Solar energy
3.95 kWh/m²
Travel score
6.3
out of 10

Umán is city in Yucatán, Mexico.

Founded
1921

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical December day in Umán reaches about 29°C in the afternoon and slips back to 19°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 32°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13020
23020
33020
43020
53020
62920
72920
82919
92919
102919
112919
122919
132919
142919
152919
162919
172919
182919
192919
202919
212919
222919
232919
242919
252919
262919
272919
282919
292919
302919
312919

How December really feels in Umán

Once humidity and wind are folded in, December 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

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

Umán weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 19°204.310.96.4
Feb31° / 19°153.311.35.6
Mar33° / 21°14311.94.3
Apr35° / 22°224.312.53.0
May36° / 24°507.8132.4
Jun35° / 25°12316.513.22.3
Jul34° / 24°8215.113.12.5
Aug34° / 24°991712.72.4
Sep33° / 24°13919.612.12.6
Oct32° / 23°8813.911.53.9
Nov30° / 21°306.4115.5
Dec29° / 19°234.310.86.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 22% of December, with mostly cloudy or overcast conditions the remaining 32%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17129
27129
37129
47129
57228
67228
77228
87228
97129
107129
117030
127030
136832
146733
156733
166634
176634
186535
196535
206436
216436
226436
236436
246436
256535
266535
276535
286634
296634
306634
316733

Chance of precipitation in December

Any precipitation

Umán gets around 23 mm of rain over 4.3 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 14% and peaks near 15% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
114
214
314
414
514
614
714
814
914
1014
1115
1215
1315
1415
1515
1615
1715
1815
1915
2014
2114
2214
2314
2414
2513
2613
2713
2813
2913
3013
3113

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the muggy band about 41% of days. Sticky, muggy-or-worse air turns up on roughly 62% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
117214328
228214327
328214326
428214426
528214425
629214425
729204325
8310204325
9310214224
10311214124
11311214124
12311214024
13412223924
14412223823
15413233823
16413233723
17413233722
18413243721
19413243721
20413243820
21513243820
22513253919
23513253919
24512254018
25512244118
26512244217
27512244217
28512234316
29613234316
30613234316
31613224315

Wind in December

Winds average 10 km/h in December.

Across December, daily wind ranges from about 10 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 48 min at the start of December to 10 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 6:24 AM to 6:40 AM, and sunset from 5:13 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.86:245:13
210.86:255:14
310.86:255:14
410.86:265:14
510.86:275:14
610.86:275:14
710.86:285:14
810.86:285:15
910.86:295:15
1010.86:305:15
1110.86:305:16
1210.86:315:16
1310.76:315:16
1410.76:325:17
1510.76:325:17
1610.76:335:17
1710.76:345:18
1810.76:345:18
1910.76:355:19
2010.76:355:19
2110.76:365:19
2210.76:365:20
2310.76:375:20
2410.76:375:21
2510.76:375:21
2610.76:385:22
2710.76:385:22
2810.76:395:23
2910.76:395:23
3010.76:395:24
3110.76:405:25

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.95 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.95 kWh/m² to a high of 6.73 kWh/m² in May across the year — December's 3.95 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.1Bright
24.0Bright
34.0Bright
44.0Bright
54.0Bright
64.0Bright
74.0Moderate
84.0Moderate
94.0Moderate
104.0Moderate
113.9Moderate
123.9Moderate
133.9Moderate
143.9Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.9Moderate
193.9Moderate
203.9Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.9Moderate
293.9Moderate
304.0Moderate
314.0Moderate
Planning a trip in December

Hazard calendar for Umán

In seasonPeak

None of Umán's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

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

Umán's rainy season runs June–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 December a good time to visit Umán?

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

6.3
Sightseeing
2nd-best month of the year
8.1
Beach & pool
2nd-best month of the year

December is a reasonable time to visit Umán for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Umán in December

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

In December, Umán sees daytime highs around 29°C and nights near 19°C. Pack light clothes. About 4 days see rain.

light clothes

Sea temperature near Umán in December

The nearest coast averages about 25°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 48 km away) is warmest in September at about 28°C and coldest in January near 24°C.

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

22°24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan24Refreshing
Feb24Refreshing
Mar25Warm
Apr26Warm
May27Warm
Jun27Warm
Jul27Warm
Aug28Warm
Sep28Tropical
Oct28Warm
Nov26Warm
Dec25Warm

UV index in Umán in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Umán peaks around June 16 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 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 highHighJun 16UV 13Dec 17UV 6
UV index (midday)Level
Jan7High
Feb10Very high
Mar11Extreme
Apr12Extreme
May11Extreme
Jun13Extreme
Jul11Extreme
Aug12Extreme
Sep11Extreme
Oct10Very high
Nov7High
Dec6High

Air quality in Umán in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Umán is worst in June — around 26 µg/m³ PM2.5 (moderate), about 3.4× the cleanest month (November, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 2025 µg/m³Nov 228 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar11Good
Apr21Moderate
May20Moderate
Jun26Moderate
Jul24Moderate
Aug19Moderate
Sep15Moderate
Oct10Good
Nov8Good
Dec8Good
Location & terrain

Where is Umán?

Umán sits at 20.9°N, 89.7°W, 15 m above sea level, in Mexico. The nearest listed city is Merida, 16 km away.

Topography around Umán

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

Within 3 km, the terrain around Umán has only modest variations in elevation — a maximum elevation change of 13 m around an average of 10 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 33 m; within 80 km, only modest variations in elevation — a maximum elevation change of 152 m.

The land around Umán is covered by trees (69%) within 3 km, trees (79%) within 16 km, and trees (64%) and water (24%) within 80 km.

3 km
13 m
16 km
33 m
80 km
152 m
treesshrubsgrasslandartificial surfaceswatermangroves
December weather nearby: Merida 16 km · Hunucmá 20 km · Kanasín 21 km · Progreso 45 km · Motul 54 km · Ticul 58 km · Oxkutzkab 72 km · Izamal 76 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 Umán (20.8815°, -89.748°, elevation 15 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).