Bacchus Marsh in Summer
In summer (December, January and February), Bacchus Marsh sees average daytime highs around 24°C and overnight lows near 12°C, with 145 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 35% of the time across summer, and the air most often feels dry.
Summer is Bacchus Marsh's best season of the year to visit on our travel score. For the whole year in context, see Bacchus Marsh's year-round climate.
- Avg daytime high
- 24°C
- warmest season of the year
- Avg overnight low
- 12°C
- Rainfall
- 145 mm
- 20 wet days
- Avg wind
- 12 km/h
- Travel score
- 7.4
- best season of the year
- Months
- Dec · Jan · Feb
Temperature in Bacchus Marsh 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 Bacchus Marsh reaches about 24°C and drops to 12°C overnight. The warmest of the three months is January, the coolest December.
Bacchus Marsh 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° / 13° | 46 | 6.2 | 14.3 | 7.5 |
| Feb | 25° / 13° | 44 | 6 | 13.5 | 7.5 |
| Mar | 23° / 12° | 28 | 4.7 | 12.3 | 7.6 |
| Apr | 19° / 9° | 37 | 6.3 | 11.1 | 6.6 |
| May | 16° / 8° | 33 | 6.9 | 10 | 5.1 |
| Jun | 13° / 6° | 43 | 8.6 | 9.4 | 3.7 |
| Jul | 12° / 6° | 35 | 8.8 | 9.7 | 3.4 |
| Aug | 14° / 6° | 43 | 9.6 | 10.5 | 3.9 |
| Sep | 16° / 7° | 52 | 10.3 | 11.7 | 4.9 |
| Oct | 18° / 8° | 58 | 9.8 | 13 | 5.9 |
| Nov | 21° / 9° | 63 | 8.9 | 14 | 6.5 |
| Dec | 23° / 11° | 54 | 7.4 | 14.6 | 7.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 35% of the time across summer.
Chance of precipitation in Summer
Bacchus Marsh gets around 145 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 12 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 24 min in early December to 13 hours 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 Bacchus Marsh
In summer, Bacchus Marsh overlaps its cyclone season. The full year is below, with each hazard's peak months called out.
Bacchus Marsh sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Is summer a good time to visit Bacchus Marsh?
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 Bacchus Marsh for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Bacchus Marsh in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Bacchus Marsh sees daytime highs around 24°C and nights near 12°C. Pack sun protection. Worth having: light clothes. About 20 days see rain.
Sea temperature near Bacchus Marsh 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 44 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 Bacchus Marsh in Summer
Clear-sky midday UV across summer averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Bacchus Marsh peaks around December 19 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 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 | 11 | 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 | 11 | 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 Bacchus Marsh?
Bacchus Marsh sits at 37.7°S, 144.4°E, 111 m above sea level, in Australia. The nearest listed city is Tarneit, 27 km away.
Topography around Bacchus Marsh
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Bacchus Marsh.
Within 3 km, the terrain around Bacchus Marsh has only modest variations in elevation — a maximum elevation change of 169 m around an average of 126 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 678 m; within 80 km, large variations in elevation — a maximum elevation change of 1,037 m.
The land around Bacchus Marsh is covered by grassland (40%) and artificial surfaces (27%) within 3 km, grassland (52%) and trees (29%) within 16 km, and grassland (47%) and trees (24%) 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 Bacchus Marsh (-37.6727°, 144.4383°, elevation 111 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.