Byron Bay in Summer
In summer (December, January and February), Byron Bay sees average daytime highs around 27°C and overnight lows near 21°C, with 387 mm of rain over about 40 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 27°C. The sky is clear or mostly clear about 32% of the time across summer, and the air most often feels muggy.
Summer is Byron Bay's weakest season of the year to visit on our travel score. For the whole year in context, see Byron Bay's year-round climate.
- Avg daytime high
- 27°C
- warmest season of the year
- Avg overnight low
- 21°C
- Rainfall
- 387 mm
- 40 wet days
- Avg wind
- 13 km/h
- Travel score
- 6.0
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Byron Bay in Summer
Across summer, daytime highs hold fairly steady around 27°C.
A typical summer day in Byron Bay reaches about 27°C and drops to 21°C overnight. The warmest of the three months is January, the coolest December.
Byron Bay weather by month
How the three summer months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 21° | 140 | 13.6 | 13.6 | 6.0 |
| Feb | 27° / 21° | 138 | 13.7 | 13 | 5.7 |
| Mar | 26° / 20° | 128 | 15.3 | 12.2 | 6.0 |
| Apr | 24° / 17° | 78 | 12.5 | 11.3 | 6.6 |
| May | 22° / 14° | 87 | 10.4 | 10.6 | 6.8 |
| Jun | 20° / 12° | 102 | 9.7 | 10.2 | 6.5 |
| Jul | 19° / 11° | 50 | 7 | 10.4 | 7.0 |
| Aug | 20° / 11° | 55 | 6.4 | 11 | 7.4 |
| Sep | 22° / 14° | 40 | 6.8 | 11.8 | 7.6 |
| Oct | 24° / 16° | 78 | 9.5 | 12.7 | 7.3 |
| Nov | 25° / 18° | 104 | 11.1 | 13.4 | 6.7 |
| Dec | 27° / 20° | 109 | 12.5 | 13.8 | 6.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 32% of the time across summer.
Chance of precipitation in Summer
Byron Bay gets around 387 mm of rain over 40 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 13 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 42 min in early December to 12 h 42 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.5 kWh/m².
Hazard calendar for Byron Bay
In summer, Byron Bay overlaps 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.
Is summer a good time to visit Byron Bay?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer 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 Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Byron Bay sees daytime highs around 27°C and nights near 21°C. Pack light clothes, rain gear and sun protection. About 40 days see rain.
Sea temperature near Byron Bay in Summer
The nearest coast averages about 26°C across summer — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 26 | 26 | 26 | 25 | 24 | 22 | 21 | 21 | 21 | 22 | 24 | 25 |
| Comfort | Warm | Warm | Warm | Warm | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 26 | Warm |
| Feb | 26 | Warm |
| Mar | 26 | Warm |
| Apr | 25 | Warm |
| May | 24 | Refreshing |
| Jun | 22 | Refreshing |
| Jul | 21 | Refreshing |
| Aug | 21 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 22 | Refreshing |
| Nov | 24 | Refreshing |
| Dec | 25 | Warm |
UV index in Byron Bay in Summer
Clear-sky midday UV across summer averages 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 14 | 13 | 11 | 8 | 5 | 4 | 4 | 6 | 7 | 10 | 11 | 13 |
| Level | Extreme | Extreme | Extreme | Very high | Moderate | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 13 | Extreme |
| Mar | 11 | Extreme |
| Apr | 8 | Very high |
| May | 5 | Moderate |
| Jun | 4 | Moderate |
| Jul | 4 | Moderate |
| Aug | 6 | High |
| Sep | 7 | Very high |
| Oct | 10 | Very high |
| Nov | 11 | Extreme |
| Dec | 13 | Extreme |
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.
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
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.