Santo Tomás weather in December

In December, Santo Tomás sees average daytime highs of 31°C and overnight lows near 25°C, with 57 mm of rain across 8 wet days and about 11.4 hours of daylight. It is the 10th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 41% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 11 h 24 min at the start of December to 11 h 24 min by month's end. Set against the rest of the year, December is Santo Tomás's 4th-clearest and 5th-windiest month. For the whole year in context, see Santo Tomás's year-round climate.

Daytime high
31°
10th warmest
Overnight low
25°
4th coldest
Rainfall
57 mm
8 wet days
Daylight
11 h 24 min
6:14 AM – 5:36 PM
Cloud cover
52%
4th clearest
Wind
11 km/h
5th windiest
Solar energy
5.13 kWh/m²
Travel score
4.9
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical December day in Santo Tomás reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 32°C. Set against its neighbours, December runs on par with November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13125
23125
33125
43125
53125
63125
73125
83125
93125
103125
113125
123125
133125
143125
153125
163125
173125
183125
193125
203125
213125
223125
233125
243125
253125
263125
273125
283125
293125
303125
313125

How December really feels in Santo Tomás

Once humidity and wind are folded in, December averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Santo Tomás weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 25°71.611.45.4
Feb32° / 25°51.111.65.1
Mar32° / 25°214.711.94.5
Apr32° / 26°8913.212.23.3
May32° / 26°24723.912.52.7
Jun32° / 26°2032212.62.8
Jul32° / 26°15118.412.63.1
Aug32° / 25°23323.712.42.7
Sep31° / 25°30427.612.12.4
Oct31° / 25°33528.611.82.6
Nov31° / 25°20622.511.53.2
Dec31° / 25°57811.44.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 17% of December, with mostly cloudy or overcast conditions the remaining 42%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24456
34456
44456
54555
64654
74654
84753
94852
104951
115050
125050
135149
145347
155545
165644
175842
185941
196139
206337
216436
226634
236733
246931
257129
267228
277327
287426
297525
307624
317723

Chance of precipitation in December

Any precipitation

Santo Tomás gets around 57 mm of rain over 8 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 27% and peaks near 50% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
150
248
346
444
543
641
740
838
937
1035
1133
1232
1330
1428
1526
1625
1723
1822
1920
2019
2117
2216
2315
2414
2513
2612
2712
2812
2912
3011
3111

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 53% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
102872
203070
303169
403367
503565
603664
703862
804060
904159
1004357
1104555
1204654
1304852
1405050
1505248
1605446
1705545
1815643
1915841
2016039
2116237
2216435
2326434
2426632
2526830
2636928
2737126
2837324
2937522
3037720
3137819

Wind in December

Winds average 11 km/h in December.

Across December, daily wind ranges from about 9 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2012calm
2112calm
2212calm
2312light breeze
2412light breeze
2512light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in December

DaylightNight

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

Days grow by about 0 minutes over December. Sunrise moves from 6:06 AM to 6:21 AM, and sunset from 5:31 PM to 5:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.46:065:31
211.46:075:31
311.46:075:32
411.46:085:32
511.46:085:32
611.46:095:33
711.46:095:33
811.46:105:33
911.46:105:34
1011.46:115:34
1111.46:115:34
1211.46:125:35
1311.46:125:35
1411.46:135:36
1511.46:135:36
1611.46:145:36
1711.46:145:37
1811.46:155:37
1911.46:155:38
2011.46:165:38
2111.46:165:39
2211.46:175:39
2311.46:175:40
2411.46:185:40
2511.46:185:41
2611.46:195:41
2711.46:195:42
2811.46:205:42
2911.46:205:43
3011.46:205:43
3111.46:215:44

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.13 kWh/m².

For context, solar energy here swings from a low near 4.8 kWh/m² to a high of 6.46 kWh/m² in March across the year — December's 5.13 kWh/m² sits near the bottom.

0246151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.1Bright
135.1Bright
145.1Bright
155.1Bright
165.1Bright
175.1Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.4Bright
305.4Bright
315.4Bright
Planning a trip in December

Hazard calendar for Santo Tomás

In seasonPeak

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

Santo Tomás's rainy season runs May–November, when most of the year's rain falls.

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

Is December a good time to visit Santo Tomás?

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

4.9
Sightseeing
3rd-best month of the year
7.0
Beach & pool
4th-best month of the year

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

What to pack for Santo Tomás in December

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

In December, Santo Tomás sees daytime highs around 31°C and nights near 25°C. Pack light clothes. Worth having: rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

Sea temperature near Santo Tomás in December

The nearest coast averages about 28°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 43 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
Jan26Warm
Feb26Warm
Mar26Warm
Apr27Warm
May28Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Santo Tomás in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Santo Tomás peaks around June 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highJun 15UV 13Dec 13UV 9
UV index (midday)Level
Jan11Extreme
Feb13Extreme
Mar12Extreme
Apr12Extreme
May12Extreme
Jun13Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov10Very high
Dec9Very high

Air quality in Santo Tomás 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 Santo Tomás is worst in March — around 42 µg/m³ PM2.5 (poor), about 2.6× the cleanest month (November, 16 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMar 1841 µg/m³Nov 2116 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb25Moderate
Mar42Poor
Apr31Moderate
May31Moderate
Jun31Moderate
Jul30Moderate
Aug24Moderate
Sep20Moderate
Oct18Moderate
Nov16Moderate
Dec17Moderate
Location & terrain

Where is Santo Tomás?

Santo Tomás sits at 10.8°N, 74.8°W, 10 m above sea level, in Colombia. The nearest listed city is Palmar de Varela, 2.0 km away.

Topography around Santo Tomás

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

Within 3 km, the terrain around Santo Tomás has only modest variations in elevation — a maximum elevation change of 29 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 141 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,802 m.

The land around Santo Tomás is covered by grassland (42%) within 3 km, grassland (53%) and trees (20%) within 16 km, and water (36%), grassland (32%) and trees (24%) within 80 km.

3 km
29 m
16 km
141 m
80 km
1,802 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetlandmangroves
December weather nearby: Palmar de Varela 2.0 km · Sabanagrande 4.0 km · Sitionuevo 4.0 km · Polonuevo 11 km · Malambo 12 km · Ponedera 13 km · Soledad 18 km · Baranoa 18 km

Colombia travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type A / B
120 / 240 V · 60 Hz
Prices
≈ 38% of US
price level, 2025
GDP per capita
$8,562
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
74%
of population, 2024
Homicide rate
24.9
per 100k, 2023
Road deaths
15.4
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 480
Religion
Roman Catholic 64%Protestant 17%none 14%atheist 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 Santo Tomás (10.7577°, -74.7545°, elevation 10 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. 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).