Byron Bay weather in December

In December, Byron Bay sees average daytime highs of 27°C and overnight lows near 20°C, with 109 mm of rain across 12.5 wet days and about 13.8 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 33% of the time in December, and the air most often feels muggy.

Daylight stretches from about 13 h 42 min at the start of December to 13 h 48 min by month's end. Set against the rest of the year, December is Byron Bay's 10th-clearest and 3rd-windiest month. For the whole year in context, see Byron Bay's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
109 mm
12.5 wet days
Daylight
13 h 48 min
5:47 AM – 7:36 PM
Cloud cover
56%
10th clearest
Wind
13 km/h
3rd windiest
Solar energy
6.81 kWh/m²
Travel score
6.2
out of 10

Byron Bay is town in New South Wales, Australia.

Density
1/km²
people per km²

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 27°C through the month.

A typical December day in Byron Bay reaches about 27°C in the afternoon and slips back to 20°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 30°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12620
22620
32620
42620
52720
62720
72720
82720
92720
102720
112720
122720
132720
142720
152720
162720
172720
182720
192720
202720
212720
222721
232721
242721
252721
262721
272721
282721
292721
302721
312721

Byron Bay weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 21°14013.613.66.0
Feb27° / 21°13813.7135.7
Mar26° / 20°12815.312.26.0
Apr24° / 17°7812.511.36.6
May22° / 14°8710.410.66.8
Jun20° / 12°1029.710.26.5
Jul19° / 11°50710.47.0
Aug20° / 11°556.4117.4
Sep22° / 14°406.811.87.6
Oct24° / 16°789.512.77.3
Nov25° / 18°10411.113.46.7
Dec27° / 20°10912.513.86.2

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 45%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25743
35644
45644
55446
65446
75347
85347
95347
105248
115248
125248
135248
145347
155347
165347
175347
185446
195446
205446
215545
225644
235644
245644
255644
265644
275644
285644
295644
305545
315545

Chance of precipitation in December

Any precipitation

Byron Bay gets around 109 mm of rain over 12.5 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 40% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
337
438
539
639
740
841
941
1041
1141
1241
1341
1441
1541
1641
1741
1841
1941
2041
2141
2240
2340
2440
2540
2641
2741
2841
2942
3042
3142

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 52% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
141836366
241835376
331835377
431734387
531733397
631733408
731633408
831632418
931632418
1021532419
1121532429
1221532429
13214334210
14214334110
15213334111
16213334111
17113334112
18112334112
19112334113
20212334013
21211334014
22211334014
23211334015
24210334015
25210334015
26110324116
2719324116
2819324216
2918314317
3018314317
3118304417

Wind in December

Winds average 13 km/h in December.

Across December, daily wind ranges from about 13 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
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 42 min at the start of December to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 5:44 AM to 5:55 AM, and sunset from 7:26 PM to 7:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:447:26
213.75:457:27
313.75:457:28
413.75:457:28
513.75:457:29
613.75:457:30
713.85:457:30
813.85:457:31
913.85:457:32
1013.85:467:32
1113.85:467:33
1213.85:467:34
1313.85:467:34
1413.85:477:35
1513.85:477:36
1613.85:477:36
1713.85:487:37
1813.85:487:37
1913.85:487:38
2013.85:497:38
2113.85:497:39
2213.85:507:39
2313.85:507:40
2413.85:517:40
2513.85:517:41
2613.85:527:41
2713.85:527:41
2813.85:537:42
2913.85:537:42
3013.85:547:42
3113.85:557:43

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.81 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.92 kWh/m² to a high of 6.81 kWh/m² in December across the year — December's 6.81 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
16.8Intense
26.8Intense
36.8Intense
46.8Intense
56.8Intense
66.8Intense
76.8Intense
86.8Intense
96.8Intense
106.8Intense
116.8Intense
126.8Intense
136.8Intense
146.8Intense
156.8Intense
166.9Intense
176.9Intense
186.9Intense
196.9Intense
207.0Intense
217.0Intense
227.0Intense
237.0Intense
247.0Intense
257.1Intense
267.1Intense
277.1Intense
287.1Intense
297.1Intense
307.1Intense
317.1Intense
Planning a trip in December

Hazard calendar for Byron Bay

In seasonPeak

In December, Byron Bay sits inside its cyclone season. The full year is below, with each hazard's peak months called out.

Byron Bay sits in the South Indian Ocean cyclone belt; the season peaks January–March.

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

Is December a good time to visit Byron Bay?

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

6.2
Sightseeing
9th-best month of the year
6.3
Beach & pool
1st-best month of the year

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

What to pack for Byron Bay in December

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

In December, Byron Bay sees daytime highs around 27°C and nights near 20°C. Pack sun protection. Worth having: light clothes and rain gear. About 13 days see rain.

sun protectionlight clothesrain gear

Sea temperature near Byron Bay 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 offshore is warmest in February at about 26°C and coldest in August near 21°C.

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

20°22°24°26°28°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar26Warm
Apr25Warm
May24Refreshing
Jun22Refreshing
Jul21Refreshing
Aug21Refreshing
Sep21Refreshing
Oct22Refreshing
Nov24Refreshing
Dec25Warm

UV index in Byron Bay in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Byron Bay peaks around January 21 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 21UV 13Jun 18UV 4
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar11Extreme
Apr8Very high
May5Moderate
Jun4Moderate
Jul4Moderate
Aug6High
Sep7Very high
Oct10Very high
Nov11Extreme
Dec13Extreme
Location & terrain

Where is Byron Bay?

Byron Bay sits at 28.6°S, 153.6°E, 0 m above sea level, in Australia. The nearest listed city is Banora Point, 49 km away.

Topography around Byron Bay

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

Within 3 km, the terrain around Byron Bay has only modest variations in elevation — a maximum elevation change of 91 m around an average of 8 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 263 m; within 80 km, large variations in elevation — a maximum elevation change of 1,197 m.

The land around Byron Bay is covered by water (40%) and trees (38%) within 3 km, water (58%) and trees (22%) within 16 km, and water (39%) and trees (38%) within 80 km.

3 km
91 m
16 km
263 m
80 km
1,197 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Banora Point 49 km · Palm Beach 61 km · Robina 68 km · Surfers Paradise 74 km · Gold Coast 74 km · Nerang 78 km · Southport 79 km · Labrador 81 km

Australia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type I
230 V · 50 Hz
Prices
≈ 90% of US
price level, 2025
GDP per capita
$65,130
2025
Happiness
6.9 / 10
World Happiness, 2025
Homicide rate
0.9
per 100k, 2023
Road deaths
4.9
per 100k/yr, 2019
Income group
High
World Bank
Religion
none 38%Roman Catholic 20%Protestant 18%other Christian 4%

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 Byron Bay (-28.6499°, 153.6125°, 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).