Heroica Matamoros weather in December

In December, Heroica Matamoros sees average daytime highs of 22°C and overnight lows near 13°C, with 34 mm of precipitation across 5.9 wet days and about 10.4 hours of daylight. It is the 11th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 21°C by the end. The sky is clear or mostly clear about 33% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 30 min at the start of December to 10 h 24 min by month's end. Set against the rest of the year, December is Heroica Matamoros's 11th-clearest and 8th-windiest month. For the whole year in context, see Heroica Matamoros's year-round climate.

Daytime high
22°
11th warmest
Overnight low
13°
2nd coldest
Precipitation
34 mm
5.9 wet days
Daylight
10 h 24 min
7:14 AM – 5:38 PM
Cloud cover
59%
11th clearest
Wind
17 km/h
8th windiest
Solar energy
2.92 kWh/m²
Travel score
7.3
out of 10

Heroica Matamoros is municipal seat of Matamoros, State of Tamaulipas, Mexico.

Founded
1774

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 21°C by the end.

A typical December day in Heroica Matamoros reaches about 22°C in the afternoon and slips back to 13°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 27°C. Set against its neighbours, December runs about 3°C cooler than November and about 1°C warmer than January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12415
22415
32315
42315
52314
62314
72314
82314
92314
102314
112314
122314
132314
142214
152213
162213
172213
182213
192213
202213
212213
222213
232213
242213
252113
262113
272113
282113
292112
302112
312112

How December really feels in Heroica Matamoros

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.

Heroica Matamoros weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan21° / 13°325.710.67.1
Feb23° / 14°275.311.17.5
Mar26° / 17°385.711.87.4
Apr28° / 20°475.912.66.5
May31° / 23°45713.25.0
Jun33° / 25°5810.313.63.8
Jul33° / 26°648.813.53.5
Aug34° / 26°5210.412.93.2
Sep32° / 24°10815.612.23.7
Oct29° / 21°729.411.45.8
Nov25° / 17°437.610.77.2
Dec22° / 13°345.910.47.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25149
35050
44951
54852
64852
74852
84852
94753
104852
114852
124852
134852
144951
154951
164951
175050
185050
195050
205050
214951
224951
234852
244753
254654
264654
274555
284555
294555
304456
314456

Chance of precipitation in December

Any precipitation

Heroica Matamoros gets around 34 mm of rain and snow over 5.9 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 19% and peaks near 20% on the wettest days, and about 0 day brings snow.

0%10%20%30%151015202531
Rain chance (%)
119
219
318
418
518
618
718
818
918
1019
1119
1219
1319
1419
1519
1619
1719
1819
1919
2019
2119
2219
2320
2420
2520
2620
2719
2819
2919
3019
3119

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 46% of days. Sticky, muggy-or-worse air turns up on roughly 24% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1361616257
2371516257
3381516247
4381516246
5391516246
6401416246
7411416246
8421416235
9431416235
10441316235
11451315224
12451415224
13451415214
14461415214
15461415204
16471515203
17471515193
18481516193
19481516183
20491516183
21491516173
22491516173
23501616163
24501616163
25501616163
26501616162
27521516152
28521516152
29521516152
30521516152
31521516152

Wind in December

Winds average 17 km/h in December.

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

05101520151015202531
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze
3117light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 30 min at the start of December to 10 h 24 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 7:05 AM to 7:21 AM, and sunset from 5:35 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.57:055:35
210.57:065:35
310.57:065:35
410.57:075:35
510.57:085:35
610.47:085:35
710.47:095:35
810.47:105:36
910.47:105:36
1010.47:115:36
1110.47:115:36
1210.47:125:37
1310.47:135:37
1410.47:135:37
1510.47:145:38
1610.47:145:38
1710.47:155:38
1810.47:165:39
1910.47:165:39
2010.47:175:40
2110.47:175:40
2210.47:185:40
2310.47:185:41
2410.47:185:41
2510.47:195:42
2610.47:195:42
2710.47:205:43
2810.47:205:44
2910.47:205:44
3010.47:215:45
3110.47:215:45

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.92 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.92 kWh/m² to a high of 6.72 kWh/m² in July across the year — December's 2.92 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.1Moderate
23.0Moderate
33.0Moderate
43.0Moderate
53.0Moderate
63.0Moderate
73.0Moderate
83.0Moderate
93.0Moderate
103.0Moderate
112.9Moderate
122.9Moderate
132.9Moderate
142.9Moderate
152.9Moderate
162.9Moderate
172.9Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.9Moderate
232.9Moderate
242.9Moderate
252.9Moderate
262.9Moderate
272.9Moderate
282.9Moderate
292.9Moderate
302.9Moderate
312.9Moderate
Planning a trip in December

Hazard calendar for Heroica Matamoros

In seasonPeak

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

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

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

Is December a good time to visit Heroica Matamoros?

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

7.3
Sightseeing
3rd-best month of the year
5.3
Beach & pool
11th-best month of the year

December is one of the better times to visit Heroica Matamoros for general sightseeing.

What to pack for Heroica Matamoros in December

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

In December, Heroica Matamoros sees daytime highs around 22°C and nights near 13°C. Worth packing: light clothes. About 6 days see rain.

light clothes

Sea temperature near Heroica Matamoros in December

The nearest coast averages about 21°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 38 km away) is warmest in September at about 29°C and coldest in February near 19°C.

It's comfortable for a long swim from Mar 18 to Jan 2 — about 9.6 months when the water holds above 20°C.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan19Cool
Feb19Cool
Mar20Cool
Apr22Refreshing
May25Warm
Jun28Warm
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct27Warm
Nov24Warm
Dec21Refreshing

UV index in Heroica Matamoros in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Heroica Matamoros peaks around June 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highExtremeVery highHighJun 21UV 12Dec 22UV 5
UV index (midday)Level
Jan5Moderate
Feb7High
Mar8Very high
Apr11Extreme
May9Very high
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep10Very high
Oct8Very high
Nov6High
Dec5Moderate

Air quality in Heroica Matamoros 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 Heroica Matamoros is worst in July — around 25 µg/m³ PM2.5 (moderate), about 3.7× the cleanest month (October, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1525 µg/m³Oct 247 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar11Good
Apr13Moderate
May19Moderate
Jun20Moderate
Jul25Moderate
Aug18Moderate
Sep13Moderate
Oct7Good
Nov7Good
Dec9Good
Location & terrain

Where is Heroica Matamoros?

Heroica Matamoros sits at 25.9°N, 97.5°W, 16 m above sea level, in Mexico. The nearest listed city is Brownsville, 3.0 km away.

Topography around Heroica Matamoros

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

Within 3 km, the terrain around Heroica Matamoros has only modest variations in elevation — a maximum elevation change of 13 m around an average of 11 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 28 m; within 80 km, only modest variations in elevation — a maximum elevation change of 81 m.

The land around Heroica Matamoros is covered by artificial surfaces (66%) and trees (20%) within 3 km, cropland (32%), grassland (21%) and artificial surfaces (20%) within 16 km, and cropland (38%) and water (34%) within 80 km.

3 km
13 m
16 km
28 m
80 km
81 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Brownsville 3.0 km · San Benito 31 km · Valle Hermoso 38 km · Harlingen 40 km · Mercedes 51 km · Weslaco 58 km · Ciudad Río Bravo 60 km · Donna 64 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 Heroica Matamoros (25.8797°, -97.5042°, elevation 16 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).