Port Saint Lucie weather in December

In December, Port Saint Lucie sees average daytime highs of 74°F and overnight lows near 65°F, with 1.6 in of rain across 7.3 wet days and about 10.3 hours of daylight. It is the 10th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 74°F through the month. 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 24 min at the start of December to 10 h 18 min by month's end. Set against the rest of the year, December is Port Saint Lucie's 6th-clearest and 4th-windiest month. For the whole year in context, see Port Saint Lucie's year-round climate.

Daytime high
74°
10th warmest
Overnight low
65°
3rd coldest
Rainfall
1.6 in
7.3 wet days
Daylight
10 h 18 min
7:09 AM – 5:26 PM
Cloud cover
55%
6th clearest
Wind
10 mph
4th windiest
Solar energy
3.08 kWh/m²
Travel score
7.3
out of 10

Port Saint Lucie is city in St. Lucie County, Florida, United States.

Density
527/km²
people per km²
Founded
1961

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 74°F through the month.

A typical December day in Port Saint Lucie reaches about 74°F in the afternoon and slips back to 65°F overnight — a 9°F spread between the day's warmth and the night's chill. On most days the high lands between 66°F and 79°F. Set against its neighbours, December runs about 3°F cooler than November and about 2°F warmer than January.

50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
17567
27567
37567
47567
57567
67566
77566
87466
97466
107466
117466
127465
137465
147465
157465
167465
177365
187365
197365
207364
217364
227364
237364
247364
257364
267364
277364
287364
297364
307364
317263

How December really feels in Port Saint Lucie

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
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.

Port Saint Lucie weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan72° / 62°2.07.110.57.2
Feb73° / 63°1.86.5117.5
Mar75° / 66°2.37.111.87.6
Apr78° / 70°2.27.112.67.3
May82° / 74°2.91013.36.4
Jun85° / 77°4.817.613.74.4
Jul86° / 79°3.618.213.54.0
Aug86° / 79°4.821133.7
Sep85° / 78°5.519.712.24.1
Oct82° / 75°4.012.211.36.0
Nov77° / 69°2.28.710.77.1
Dec74° / 65°1.67.310.37.3

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 21% of December, with mostly cloudy or overcast conditions the remaining 47%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25941
35941
46040
56040
66040
75941
85842
95743
105743
115644
125644
135446
145446
155347
165248
175149
184951
194951
204852
214852
224951
234951
244951
254951
264951
274951
285050
294951
305050
315248

Chance of precipitation in December

Any precipitation

Port Saint Lucie gets around 1.6 in of rain over 7.3 wet days in December, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 24% and peaks near 26% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
125
225
325
425
525
625
725
825
926
1025
1125
1225
1325
1425
1524
1624
1724
1824
1924
2023
2123
2223
2323
2423
2523
2623
2724
2824
2924
3024
3124

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 28% of days. Sticky, muggy-or-worse air turns up on roughly 34% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1211827268
2211827268
3221727278
4221726278
5231625288
6231624298
7241624298
8241523308
9251523307
10251523307
11261523307
12271422307
13271422297
14281422297
15291422297
16301422287
17301421287
18311421277
19321421267
20321421267
21321421257
22331421257
23331421257
24331521257
25331521257
26321521267
27321421267
28321420267
29331420266
30331420266
31331420266

Wind in December

Winds average 10 mph in December.

Across December, daily wind ranges from about 10 mph on the calmest days to 11 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
111light breeze
211light breeze
311light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
1110light breeze
1210light breeze
1310light breeze
1410light breeze
1511light breeze
1611light breeze
1711light breeze
1811light breeze
1911light breeze
2011light breeze
2111light breeze
2211light breeze
2311light breeze
2411light breeze
2511light breeze
2611light breeze
2711light breeze
2811light breeze
2911light breeze
3011light breeze
3111light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 24 min at the start of December to 10 h 18 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 6:59 AM to 7:16 AM, and sunset from 5:23 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.46:595:23
210.47:005:23
310.47:015:23
410.47:015:23
510.47:025:24
610.37:035:24
710.37:035:24
810.37:045:24
910.37:055:24
1010.37:055:24
1110.37:065:25
1210.37:075:25
1310.37:075:25
1410.37:085:25
1510.37:085:26
1610.37:095:26
1710.37:105:27
1810.37:105:27
1910.37:115:27
2010.37:115:28
2110.37:125:28
2210.37:125:29
2310.37:135:29
2410.37:135:30
2510.37:135:30
2610.37:145:31
2710.37:145:31
2810.37:155:32
2910.37:155:32
3010.37:155:33
3110.37:165:34

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.08 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.08 kWh/m² to a high of 6.42 kWh/m² in May across the year — December's 3.08 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.2Moderate
23.2Moderate
33.2Moderate
43.2Moderate
53.2Moderate
63.1Moderate
73.1Moderate
83.1Moderate
93.1Moderate
103.1Moderate
113.1Moderate
123.1Moderate
133.1Moderate
143.1Moderate
153.0Moderate
163.0Moderate
173.0Moderate
183.0Moderate
193.0Moderate
203.0Moderate
213.0Moderate
223.0Moderate
233.0Moderate
243.0Moderate
253.0Moderate
263.1Moderate
273.1Moderate
283.1Moderate
293.1Moderate
303.1Moderate
313.1Moderate
Planning a trip in December

Hazard calendar for Port Saint Lucie

In seasonPeak

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

Port Saint Lucie 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 Port Saint Lucie?

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
5.8
Beach & pool
7th-best month of the year

December is one of the better times to visit Port Saint Lucie for general sightseeing.

What to pack for Port Saint Lucie in December

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

In December, Port Saint Lucie sees daytime highs around 74°F and nights near 65°F. Worth packing: light clothes. About 7 days see rain.

light clothes

Sea temperature near Port Saint Lucie in December

The nearest coast averages about 77°F 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 15 mi away) is warmest in August at about 84°F and coldest in February near 74°F.

The water stays above 68°F all year — warm enough for a swim any month.

75°80°85°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan74Refreshing
Feb74Refreshing
Mar74Refreshing
Apr76Warm
May79Warm
Jun82Warm
Jul83Tropical
Aug84Tropical
Sep84Tropical
Oct82Warm
Nov79Warm
Dec77Warm

UV index in Port Saint Lucie in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Port Saint Lucie peaks around July 13 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 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 highHighModerateJul 13UV 11Dec 18UV 5
UV index (midday)Level
Jan5High
Feb7High
Mar9Very high
Apr9Very high
May10Very high
Jun11Extreme
Jul11Extreme
Aug10Extreme
Sep9Very high
Oct8Very high
Nov6High
Dec4Moderate

Air quality in Port Saint Lucie 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 Port Saint Lucie is worst in July — around 20 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1819 µg/m³Dec 138 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar11Good
Apr11Good
May11Good
Jun15Moderate
Jul20Moderate
Aug17Moderate
Sep12Good
Oct9Good
Nov8Good
Dec8Good
Location & terrain

Where is Port Saint Lucie?

Port Saint Lucie sits at 27.3°N, 80.4°W, 16 ft above sea level, in United States. The nearest listed city is Stuart, 8.7 mi away.

Topography around Port Saint Lucie

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Port Saint Lucie.

Within 2 miles, the terrain around Port Saint Lucie has only modest variations in elevation — a maximum elevation change of 43 ft around an average of 20 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 144 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 200 ft.

The land around Port Saint Lucie is covered by artificial surfaces (50%) and trees (31%) within 2 miles, grassland (30%) and trees (27%) within 10 miles, and water (39%) and grassland (25%) within 50 miles.

2 miles
43 ft
10 miles
144 ft
50 miles
200 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
December weather nearby: Stuart 8.7 mi · Palm City 9.9 mi · Fort Pierce 11 mi · Florida Ridge 20 mi · Vero Beach South 22 mi · Vero Beach 24 mi · Jupiter 29 mi · The Acreage 35 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Port Saint Lucie (27.2939°, -80.3503°, elevation 16 ft), 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).