St Clair in Winter
In winter (June, July and August), St Clair sees average daytime highs around 18°C and overnight lows near 6°C, with 119 mm of rain over about 16 wet days across the season. It is the coldest season of the year and the driest season of the year.
Across winter, daytime highs hold fairly steady around 18°C. The sky is clear or mostly clear about 57% of the time across winter, and the air most often feels dry.
Winter is St Clair's 3rd-best season to visit on our travel score. For the whole year in context, see St Clair's year-round climate.
- Avg daytime high
- 18°C
- coldest season of the year
- Avg overnight low
- 6°C
- Rainfall
- 119 mm
- 16 wet days
- Avg wind
- 9 km/h
- Travel score
- 6.7
- 3rd-best season
- Months
- Jun · Jul · Aug
Temperature in St Clair in Winter
Across winter, daytime highs hold fairly steady around 18°C.
A typical winter day in St Clair reaches about 18°C and drops to 6°C overnight. The warmest of the three months is August, the coolest July.
St Clair weather by month
How the three winter months (June, July and August) 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 | 29° / 18° | 77 | 11 | 14 | 5.5 |
| Feb | 28° / 18° | 100 | 11.4 | 13.3 | 5.9 |
| Mar | 26° / 16° | 76 | 10.9 | 12.3 | 6.7 |
| Apr | 23° / 12° | 47 | 6.8 | 11.2 | 7.5 |
| May | 20° / 9° | 41 | 5.4 | 10.3 | 7.2 |
| Jun | 17° / 7° | 55 | 6.7 | 9.8 | 6.3 |
| Jul | 17° / 5° | 31 | 4.7 | 10 | 6.5 |
| Aug | 19° / 6° | 33 | 4.6 | 10.7 | 7.3 |
| Sep | 22° / 9° | 40 | 5.7 | 11.8 | 7.6 |
| Oct | 24° / 11° | 53 | 7.6 | 12.9 | 7.5 |
| Nov | 26° / 14° | 78 | 10 | 13.8 | 6.7 |
| Dec | 27° / 16° | 75 | 10.2 | 14.2 | 6.3 |
Cloud cover in Winter
The sky is clear or mostly clear about 57% of the time across winter.
Chance of precipitation in Winter
St Clair gets around 119 mm of rain over 16 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 9 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 9 h 54 min in early June to 11 h 12 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 3.1 kWh/m².
Hazard calendar for St Clair
None of St Clair's seasonal hazards peak in winter. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
St Clair sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Is winter a good time to visit St Clair?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a reasonable time to visit St Clair for sightseeing.
What to pack for St Clair in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, St Clair sees daytime highs around 18°C and nights near 6°C. Worth packing: a warm layer. About 16 days see rain.
Sea temperature near St Clair in Winter
The nearest coast averages about 19°C across winter — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 48 km away) is warmest in February at about 23°C and coldest in August near 18°C.
It's comfortable for a long swim from Nov 16 to Jun 2 — about 6.5 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 23 | 23 | 23 | 22 | 21 | 19 | 18 | 18 | 18 | 19 | 20 | 21 |
| Comfort | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Cool | Cool | Cool | Cool | Cool | Refreshing | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 23 | Refreshing |
| Feb | 23 | Refreshing |
| Mar | 23 | Refreshing |
| Apr | 22 | Refreshing |
| May | 21 | Refreshing |
| Jun | 19 | Cool |
| Jul | 18 | Cool |
| Aug | 18 | Cool |
| Sep | 18 | Cool |
| Oct | 19 | Cool |
| Nov | 20 | Refreshing |
| Dec | 21 | Refreshing |
UV index in St Clair in Winter
Clear-sky midday UV across winter averages around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in St Clair peaks around January 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 12 | 12 | 9 | 6 | 4 | 2 | 3 | 4 | 6 | 8 | 10 | 11 |
| Level | Extreme | Extreme | Very high | High | Moderate | Moderate | Moderate | Moderate | High | Very high | Very high | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 12 | Extreme |
| Feb | 12 | Extreme |
| Mar | 9 | Very high |
| Apr | 6 | High |
| May | 4 | Moderate |
| Jun | 2 | Moderate |
| Jul | 3 | Moderate |
| Aug | 4 | Moderate |
| Sep | 6 | High |
| Oct | 8 | Very high |
| Nov | 10 | Very high |
| Dec | 11 | Extreme |
Air quality in St Clair in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in St Clair is worst in December — around 49 µg/m³ PM2.5 (poor), about 8.1× the cleanest month (June, 6 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 7 | 7 | 8 | 8 | 6 | 6 | 8 | 10 | 10 | 25 | 49 |
| Level | Good | Good | Good | Good | Good | Good | Good | Good | Good | Good | Moderate | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 7 | Good |
| Mar | 7 | Good |
| Apr | 8 | Good |
| May | 8 | Good |
| Jun | 6 | Good |
| Jul | 6 | Good |
| Aug | 8 | Good |
| Sep | 10 | Good |
| Oct | 10 | Good |
| Nov | 25 | Moderate |
| Dec | 49 | Poor |
Where is St Clair?
St Clair sits at 33.8°S, 150.8°E, 49 m above sea level, in Australia. The nearest listed city is Mount Druitt, 5.0 km away.
Topography around St Clair
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of St Clair.
Within 3 km, the terrain around St Clair has only modest variations in elevation — a maximum elevation change of 62 m around an average of 45 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 325 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,382 m.
The land around St Clair is covered by artificial surfaces (48%), grassland (27%) and trees (24%) within 3 km, trees (35%), grassland (32%) and artificial surfaces (28%) within 16 km, and trees (65%) and water (21%) 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 St Clair (-33.7973°, 150.7847°, elevation 49 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.