Sunbury in Summer
In summer (December, January and February), Sunbury sees average daytime highs around 24°C and overnight lows near 11°C, with 160 mm of rain over about 20 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Over the season highs climb from about 22°C in early December to 24°C by late February. The sky is clear or mostly clear about 39% of the time across summer, and the air most often feels dry.
Summer is Sunbury's best season of the year to visit on our travel score. For the whole year in context, see Sunbury's year-round climate.
- Avg daytime high
- 24°C
- warmest season of the year
- Avg overnight low
- 11°C
- Rainfall
- 160 mm
- 20 wet days
- Avg wind
- 13 km/h
- Travel score
- 7.5
- best season of the year
- Months
- Dec · Jan · Feb
Temperature in Sunbury in Summer
Over the season highs climb from about 22°C in early December to 24°C by late February.
A typical summer day in Sunbury reaches about 24°C and drops to 11°C overnight. The warmest of the three months is January, the coolest December.
Sunbury 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 | 25° / 12° | 53 | 6.5 | 14.3 | 7.6 |
| Feb | 25° / 12° | 47 | 6.1 | 13.4 | 7.6 |
| Mar | 22° / 11° | 33 | 5.3 | 12.3 | 7.5 |
| Apr | 18° / 8° | 41 | 6.4 | 11.1 | 6.4 |
| May | 15° / 7° | 38 | 7.6 | 10 | 4.5 |
| Jun | 12° / 5° | 46 | 9 | 9.5 | 3.1 |
| Jul | 11° / 5° | 38 | 9.1 | 9.7 | 2.8 |
| Aug | 12° / 5° | 49 | 10.1 | 10.6 | 3.3 |
| Sep | 15° / 6° | 56 | 10.5 | 11.7 | 4.4 |
| Oct | 18° / 7° | 62 | 9.5 | 13 | 5.8 |
| Nov | 21° / 9° | 64 | 8.9 | 14 | 6.5 |
| Dec | 23° / 10° | 61 | 7.7 | 14.5 | 7.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 39% of the time across summer.
Chance of precipitation in Summer
Sunbury gets around 160 mm of rain over 20 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — 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 14 h 24 min in early December to 12 h 54 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 6.8 kWh/m².
Hazard calendar for Sunbury
In summer, Sunbury overlaps its cyclone season. The full year is below, with each hazard's peak months called out.
Sunbury sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Is summer a good time to visit Sunbury?
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 one of the better times to visit Sunbury for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Sunbury in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Sunbury sees daytime highs around 24°C and nights near 11°C. Pack sun protection. Worth having: light clothes. About 20 days see rain.
Sea temperature near Sunbury in Summer
The nearest coast averages about 20°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 36 km away) is warmest in February at about 21°C and coldest in August near 11°C.
It's comfortable for a long swim from Jan 15 to Mar 11 — about 1.8 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 20 | 21 | 20 | 18 | 15 | 13 | 12 | 11 | 12 | 14 | 17 | 19 |
| Comfort | Refreshing | Refreshing | Cool | Cool | Cool | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 20 | Refreshing |
| Feb | 21 | Refreshing |
| Mar | 20 | Cool |
| Apr | 18 | Cool |
| May | 15 | Cool |
| Jun | 13 | Bracing |
| Jul | 12 | Bracing |
| Aug | 11 | Bracing |
| Sep | 12 | Bracing |
| Oct | 14 | Bracing |
| Nov | 17 | Cool |
| Dec | 19 | Cool |
UV index in Sunbury in Summer
Clear-sky midday UV across summer averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Sunbury peaks around December 19 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 17 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 11 | 10 | 8 | 5 | 3 | 2 | 2 | 3 | 5 | 8 | 10 | 13 |
| Level | Extreme | Extreme | Very high | Moderate | Moderate | Low | Moderate | Moderate | Moderate | Very high | Very high | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 10 | Extreme |
| Mar | 8 | Very high |
| Apr | 5 | Moderate |
| May | 3 | Moderate |
| Jun | 2 | Low |
| Jul | 2 | Moderate |
| Aug | 3 | Moderate |
| Sep | 5 | Moderate |
| Oct | 8 | Very high |
| Nov | 10 | Very high |
| Dec | 13 | Extreme |
Where is Sunbury?
Sunbury sits at 37.6°S, 144.7°E, 220 m above sea level, in Australia. The nearest listed city is Hillside, 13 km away.
Topography around Sunbury
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sunbury.
Within 3 km, the terrain around Sunbury has only modest variations in elevation — a maximum elevation change of 236 m around an average of 234 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 609 m; within 80 km, large variations in elevation — a maximum elevation change of 1,151 m.
The land around Sunbury is covered by artificial surfaces (37%), grassland (34%) and trees (26%) within 3 km, grassland (70%) within 16 km, and grassland (46%) and trees (32%) 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 Sunbury (-37.5774°, 144.7261°, elevation 220 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.