Mount Martha in Summer
In summer (December, January and February), Mount Martha sees average daytime highs around 21°C and overnight lows near 16°C, with 154 mm of rain over about 21 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 19°C in early December to 21°C by late February. The sky is clear or mostly clear about 38% of the time across summer, and the air most often feels dry.
Summer is Mount Martha's best season of the year to visit on our travel score. For the whole year in context, see Mount Martha's year-round climate.
- Avg daytime high
- 21°C
- warmest season of the year
- Avg overnight low
- 16°C
- Rainfall
- 154 mm
- 21 wet days
- Avg wind
- 19 km/h
- Travel score
- 7.0
- best season of the year
- Months
- Dec · Jan · Feb
Temperature in Mount Martha in Summer
Over the season highs climb from about 19°C in early December to 21°C by late February.
A typical summer day in Mount Martha reaches about 21°C and drops to 16°C overnight. The warmest of the three months is February, the coolest December.
Mount Martha 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 | 22° / 16° | 50 | 6.4 | 14.4 | 7.3 |
| Feb | 22° / 17° | 46 | 5.8 | 13.5 | 7.3 |
| Mar | 21° / 16° | 43 | 7.3 | 12.3 | 6.9 |
| Apr | 18° / 14° | 59 | 8.8 | 11 | 6.0 |
| May | 15° / 12° | 68 | 11.2 | 10 | 4.6 |
| Jun | 13° / 10° | 70 | 11.8 | 9.4 | 3.6 |
| Jul | 12° / 9° | 62 | 12.6 | 9.6 | 3.2 |
| Aug | 13° / 9° | 71 | 13 | 10.5 | 3.4 |
| Sep | 14° / 10° | 72 | 12.6 | 11.7 | 4.0 |
| Oct | 16° / 11° | 67 | 11.1 | 13 | 4.9 |
| Nov | 18° / 13° | 64 | 9.1 | 14.1 | 5.9 |
| Dec | 20° / 15° | 59 | 8.8 | 14.6 | 6.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 38% of the time across summer.
Chance of precipitation in Summer
Mount Martha gets around 154 mm of rain over 21 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 19 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 30 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 6.9 kWh/m².
Is summer a good time to visit Mount Martha?
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 Mount Martha for general sightseeing.
What to pack for Mount Martha in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Mount Martha sees daytime highs around 21°C and nights near 16°C. Pack sun protection. Worth having: rain gear. About 21 days see rain.
Sea temperature near Mount Martha in Summer
The nearest coast averages about 19°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 17 km away) is warmest in February at about 20°C and coldest in August near 12°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 19 | 20 | 19 | 17 | 16 | 14 | 13 | 12 | 13 | 14 | 16 | 17 |
| Comfort | Cool | Cool | Cool | Cool | Cool | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 19 | Cool |
| Feb | 20 | Cool |
| Mar | 19 | Cool |
| Apr | 17 | Cool |
| May | 16 | Cool |
| Jun | 14 | Bracing |
| Jul | 13 | Bracing |
| Aug | 12 | Bracing |
| Sep | 13 | Bracing |
| Oct | 14 | Bracing |
| Nov | 16 | Cool |
| Dec | 17 | Cool |
UV index in Mount Martha 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 Mount Martha 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 11 | 10 | 8 | 5 | 2 | 2 | 2 | 3 | 4 | 7 | 9 | 12 |
| Level | Extreme | Very high | Very high | Moderate | Moderate | Low | Moderate | Moderate | Moderate | Very high | Very high | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 10 | Very high |
| Mar | 8 | Very high |
| Apr | 5 | Moderate |
| May | 2 | Moderate |
| Jun | 2 | Low |
| Jul | 2 | Moderate |
| Aug | 3 | Moderate |
| Sep | 4 | Moderate |
| Oct | 7 | Very high |
| Nov | 9 | Very high |
| Dec | 12 | Extreme |
Where is Mount Martha?
Mount Martha sits at 38.3°S, 145.0°E, 11 m above sea level, in Australia. The nearest listed city is Mornington, 6.0 km away.
Topography around Mount Martha
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mount Martha.
Within 3 km, the terrain around Mount Martha has only modest variations in elevation — a maximum elevation change of 161 m around an average of 34 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 311 m; within 80 km, large variations in elevation — a maximum elevation change of 1,075 m.
The land around Mount Martha is covered by water (41%) and trees (32%) within 3 km, water (47%), trees (23%) and grassland (23%) within 16 km, and water (40%) and grassland (29%) 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 Mount Martha (-38.2667°, 145.0167°, elevation 11 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.