Bacchus Marsh weather in December

In December, Bacchus Marsh sees average daytime highs of 23°C and overnight lows near 11°C, with 54 mm of rain across 7.4 wet days and about 14.6 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Highs climb over the month, from about 22°C in the first days to 24°C by the end. The sky is clear or mostly clear about 28% of the time in December, and the air most often feels dry.

Daylight stretches from about 14 h 24 min at the start of December to 14 h 36 min by month's end. Set against the rest of the year, December is Bacchus Marsh's 4th-clearest and 8th-windiest month. For the whole year in context, see Bacchus Marsh's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
11°
9th coldest
Rainfall
54 mm
7.4 wet days
Daylight
14 h 36 min
6:01 AM – 8:36 PM
Cloud cover
60%
4th clearest
Wind
12 km/h
8th windiest
Solar energy
6.97 kWh/m²
Travel score
7.2
out of 10

Bacchus Marsh is Town in Victoria, Australia.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 22°C in the first days to 24°C by the end.

A typical December day in Bacchus Marsh reaches about 23°C in the afternoon and slips back to 11°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 32°C. Set against its neighbours, December runs about 2°C warmer than November and about 2°C cooler than January.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12210
22210
32210
42210
52210
62210
72210
82311
92311
102311
112311
122311
132311
142311
152311
162311
172311
182311
192311
202311
212311
222311
232411
242411
252411
262411
272412
282412
292412
302412
312412

Bacchus Marsh weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 13°466.214.37.5
Feb25° / 13°44613.57.5
Mar23° / 12°284.712.37.6
Apr19° / 376.311.16.6
May16° / 336.9105.1
Jun13° / 438.69.43.7
Jul12° / 358.89.73.4
Aug14° / 439.610.53.9
Sep16° / 5210.311.74.9
Oct18° / 589.8135.9
Nov21° / 638.9146.5
Dec23° / 11°547.414.67.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24159
34258
44258
54258
64357
74357
84258
94258
104357
114258
124258
134258
144357
154357
164258
174258
184258
194357
204357
214357
224456
234456
244654
254654
264753
274753
284852
294852
304852
314852

Chance of precipitation in December

Any precipitation

Bacchus Marsh gets around 54 mm of rain over 7.4 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 24% and peaks near 30% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
130
229
329
428
528
627
727
826
926
1025
1125
1224
1324
1424
1524
1624
1723
1823
1923
2023
2123
2223
2323
2422
2522
2622
2722
2821
2921
3021
3121

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 86% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
187103
287103
387103
487103
587103
687103
787103
887103
987103
1087103
1187103
1287103
1386113
1486113
1586113
1686113
1786113
1886113
1986113
2086113
2186113
2286113
2386113
2485123
2584124
2683134
2783134
2883143
2983143
3082153
3181163

Wind in December

Winds average 12 km/h in December.

Across December, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
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
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 h 24 min at the start of December to 14 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over December. Sunrise moves from 6:00 AM to 6:08 AM, and sunset from 8:24 PM to 8:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.46:008:24
214.45:598:25
314.45:598:26
414.55:598:27
514.55:598:28
614.55:598:29
714.55:598:30
814.55:598:30
914.55:598:31
1014.55:598:32
1114.66:008:33
1214.66:008:33
1314.66:008:34
1414.66:008:35
1514.66:008:36
1614.66:018:36
1714.66:018:37
1814.66:018:37
1914.66:028:38
2014.66:028:38
2114.66:038:39
2214.66:038:39
2314.66:038:40
2414.66:048:40
2514.66:058:41
2614.66:058:41
2714.66:068:41
2814.66:068:42
2914.66:078:42
3014.66:088:42
3114.66:088:43

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.97 kWh/m².

For context, solar energy here swings from a low near 1.8 kWh/m² to a high of 7.22 kWh/m² in January across the year — December's 6.97 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.7Intense
46.8Intense
56.8Intense
66.8Intense
76.8Intense
86.8Intense
96.8Intense
106.8Intense
116.9Intense
126.9Intense
136.9Intense
146.9Intense
157.0Intense
167.0Intense
177.0Intense
187.0Intense
197.1Intense
207.1Intense
217.1Intense
227.2Intense
237.2Intense
247.3Intense
257.3Intense
267.3Intense
277.4Intense
287.4Intense
297.4Intense
307.5Intense
317.5Intense
Planning a trip in December

Hazard calendar for Bacchus Marsh

In seasonPeak

In December, Bacchus Marsh sits inside 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.

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

Is December a good time to visit Bacchus Marsh?

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

7.2
Sightseeing
4th-best month of the year
5.6
Beach & pool
4th-best month of the year

December is one of the better times to visit Bacchus Marsh for general sightseeing.

What to pack for Bacchus Marsh in December

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

In December, Bacchus Marsh sees daytime highs around 23°C and nights near 11°C. Pack sun protection. Worth having: light clothes. About 7 days see rain.

sun protectionlight clothes

Sea temperature near Bacchus Marsh in December

The nearest coast averages about 19°C 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 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.

10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan20Refreshing
Feb21Refreshing
Mar20Cool
Apr18Cool
May15Cool
Jun13Bracing
Jul12Bracing
Aug11Bracing
Sep12Bracing
Oct14Bracing
Nov17Cool
Dec19Cool

UV index in Bacchus Marsh 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 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateModerateVery highExtremeDec 19UV 13Jun 18UV 2
UV index (midday)Level
Jan11Extreme
Feb11Extreme
Mar8Very high
Apr5Moderate
May3Moderate
Jun2Low
Jul2Moderate
Aug3Moderate
Sep5Moderate
Oct8Very high
Nov10Very high
Dec13Extreme
Location & terrain

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.

3 km
169 m
16 km
678 m
80 km
1,037 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Tarneit 27 km · Hillside 27 km · Caroline Springs 27 km · Sunbury 27 km · Taylors Hill 28 km · Wyndham Vale 29 km · Deer Park 31 km · Taylors Lakes 31 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 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. 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).