Mornington weather in December

In December, Mornington sees average daytime highs of 20°C and overnight lows near 15°C, with 59 mm of rain across 8.8 wet days and about 14.6 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 20°C through the month. The sky is clear or mostly clear about 31% of the time in December, and the air most often feels dry.

Daylight stretches from about 14 h 30 min at the start of December to 14 h 36 min by month's end. Set against the rest of the year, December is Mornington's 4th-clearest and 6th-windiest month. For the whole year in context, see Mornington's year-round climate.

Daytime high
20°
4th warmest
Overnight low
15°
9th coldest
Rainfall
59 mm
8.8 wet days
Daylight
14 h 36 min
5:57 AM – 8:35 PM
Cloud cover
57%
4th clearest
Wind
20 km/h
6th windiest
Solar energy
7.08 kWh/m²
Travel score
6.5
out of 10

Mornington is suburb of Melbourne, Victoria, Australia.

Air quality
Excellent
PM2.5 3.3 µg/m³ · 2019

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 20°C through the month.

A typical December day in Mornington reaches about 20°C in the afternoon and slips back to 15°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 26°C. Set against its neighbours, December runs about 2°C warmer than November and about 2°C cooler than January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
11914
21914
31914
41914
51914
61914
71914
81914
91914
102014
112014
122014
132014
142014
152014
162015
172015
182015
192015
202015
212015
222015
232015
242015
252015
262015
272015
282015
292015
302115
312115

Mornington weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 16°506.414.47.3
Feb22° / 17°465.813.57.3
Mar21° / 16°437.312.36.9
Apr18° / 14°598.8116.0
May15° / 12°6811.2104.6
Jun13° / 10°7011.89.43.6
Jul12° / 6212.69.63.2
Aug13° / 711310.53.4
Sep14° / 10°7212.611.74.0
Oct16° / 11°6711.1134.9
Nov18° / 13°649.114.15.9
Dec20° / 15°598.814.66.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24951
34951
45050
55050
65050
74951
84951
94852
104951
114852
124852
134852
144654
154753
164753
174654
184654
194753
204753
214753
224753
234852
244852
254852
264951
275050
285149
295149
305248
315347

Chance of precipitation in December

Any precipitation

Mornington gets around 59 mm of rain over 8.8 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 27% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
129
229
329
429
529
629
729
829
929
1029
1128
1228
1328
1428
1528
1628
1727
1827
1927
2027
2127
2227
2327
2427
2526
2626
2726
2825
2925
3025
3125

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 69% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1761950
2761950
3761950
4761950
5761950
6761950
7752050
8752050
9732160
10732160
11722260
12722260
13712360
14702370
15692470
16692470
17692470
18682570
19672580
20672580
21672580
22662680
23662680
24662680
25642790
26642790
27632890
28632890
29622990
30612991
31603091

Wind in December

Winds average 20 km/h in December.

Across December, daily wind ranges from about 19 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
120light breeze
220light breeze
320light breeze
420light breeze
520light breeze
620light breeze
720light breeze
820light breeze
920light breeze
1020light breeze
1120light breeze
1220light breeze
1320light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2620light breeze
2720light breeze
2820light breeze
2920light breeze
3020light breeze
3120light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 h 30 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 6 minutes over December. Sunrise moves from 5:56 AM to 6:04 AM, and sunset from 8:24 PM to 8:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.55:568:24
214.55:568:24
314.55:558:25
414.55:558:26
514.55:558:27
614.55:558:28
714.65:558:29
814.65:558:30
914.65:558:30
1014.65:558:31
1114.65:568:32
1214.65:568:33
1314.65:568:33
1414.65:568:34
1514.65:568:35
1614.65:578:35
1714.75:578:36
1814.75:578:37
1914.75:588:37
2014.75:588:38
2114.75:598:38
2214.75:598:39
2314.75:598:39
2414.76:008:40
2514.76:018:40
2614.76:018:40
2714.76:028:41
2814.66:028:41
2914.66:038:41
3014.66:048:42
3114.66:048:42

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7.08 kWh/m².

For context, solar energy here swings from a low near 1.83 kWh/m² to a high of 7.29 kWh/m² in January across the year — December's 7.08 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
16.9Intense
26.9Intense
36.9Intense
46.9Intense
57.0Intense
67.0Intense
77.0Intense
87.0Intense
97.0Intense
107.0Intense
117.0Intense
127.0Intense
137.0Intense
147.1Intense
157.1Intense
167.1Intense
177.1Intense
187.2Intense
197.2Intense
207.2Intense
217.2Intense
227.3Intense
237.3Intense
247.3Intense
257.4Intense
267.4Intense
277.5Intense
287.5Intense
297.5Intense
307.5Intense
317.5Intense
Planning a trip in December

Is December a good time to visit Mornington?

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

6.5
Sightseeing
4th-best month of the year
3.3
Beach & pool
4th-best month of the year

December is a reasonable time to visit Mornington for sightseeing.

What to pack for Mornington in December

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

In December, Mornington sees daytime highs around 20°C and nights near 15°C. Pack sun protection. Worth having: rain gear. About 9 days see rain.

sun protectionrain gear

Sea temperature near Mornington in December

The nearest coast averages about 18°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 13 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 18 to Mar 11 — about 1.7 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
Dec18Cool

UV index in Mornington in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks 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 Mornington peaks around December 20 at about 12 (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 highModerateLowModerateVery highExtremeDec 20UV 12Jun 18UV 2
UV index (midday)Level
Jan11Extreme
Feb10Very high
Mar8Very high
Apr5Moderate
May2Moderate
Jun2Low
Jul2Moderate
Aug3Moderate
Sep4Moderate
Oct7Very high
Nov9Very high
Dec12Extreme
Location & terrain

Where is Mornington?

Mornington sits at 38.2°S, 145.0°E, 25 m above sea level, in Australia. The nearest listed city is Mount Eliza, 5.0 km away.

Topography around Mornington

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

Within 3 km, the terrain around Mornington has only modest variations in elevation — a maximum elevation change of 77 m around an average of 19 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 227 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,291 m.

The land around Mornington is covered by water (53%) and artificial surfaces (24%) within 3 km, water (53%) and trees (20%) within 16 km, and water (38%) and grassland (30%) within 80 km.

3 km
77 m
16 km
227 m
80 km
1,291 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Mount Eliza 5.0 km · Mount Martha 6.0 km · Frankston South 10 km · Frankston 11 km · Frankston East 13 km · Langwarrin 13 km · Seaford 15 km · Carrum Downs 18 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 Mornington (-38.2179°, 145.0388°, elevation 25 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. 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).