Mount Isa in Winter
In winter (June, July and August), Mount Isa sees average daytime highs around 25°C and overnight lows near 11°C, with 10 mm of rain over about 2 wet days across the season. It is the coldest season of the year and the driest season of the year.
Over the season highs climb from about 25°C in early June to 28°C by late August. The sky is clear or mostly clear about 83% of the time across winter, and the air most often feels dry.
Winter is Mount Isa's best season of the year to visit on our travel score. For the whole year in context, see Mount Isa's year-round climate.
- Avg daytime high
- 25°C
- coldest season of the year
- Avg overnight low
- 11°C
- Rainfall
- 10 mm
- 2 wet days
- Avg wind
- 18 km/h
- Travel score
- 9.1
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Mount Isa in Winter
Over the season highs climb from about 25°C in early June to 28°C by late August.
A typical winter day in Mount Isa reaches about 25°C and drops to 11°C overnight. The warmest of the three months is August, the coolest July.
How winter really feels in Mount Isa
Once humidity and wind are folded in, winter brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
winter sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Mount Isa 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 | 35° / 24° | 104 | 10.1 | 13.1 | 2.4 |
| Feb | 35° / 24° | 87 | 8.9 | 12.7 | 2.8 |
| Mar | 34° / 22° | 61 | 4.5 | 12.1 | 3.5 |
| Apr | 32° / 19° | 14 | 1.3 | 11.5 | 5.3 |
| May | 27° / 15° | 7 | 1 | 11 | 8.2 |
| Jun | 25° / 11° | 6 | 0.8 | 10.8 | 9.2 |
| Jul | 25° / 10° | 2 | 0.5 | 10.9 | 9.4 |
| Aug | 27° / 12° | 2 | 0.4 | 11.3 | 8.8 |
| Sep | 31° / 16° | 6 | 0.9 | 11.9 | 5.9 |
| Oct | 34° / 20° | 12 | 1.8 | 12.5 | 3.8 |
| Nov | 36° / 22° | 27 | 5 | 13 | 2.5 |
| Dec | 36° / 24° | 62 | 7.5 | 13.2 | 2.1 |
Cloud cover in Winter
The sky is clear or mostly clear about 83% of the time across winter.
Chance of precipitation in Winter
Mount Isa gets around 10 mm of rain over 2 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 18 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 10 h 48 min in early June to 11 h 36 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 4.9 kWh/m².
Is winter a good time to visit Mount Isa?
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 one of the better times to visit Mount Isa for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Mount Isa in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Mount Isa sees daytime highs around 25°C and nights near 11°C. Worth packing: light clothes and sun protection.
UV index in Mount Isa in Winter
Clear-sky midday UV across winter averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Mount Isa peaks around February 8 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 7 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 16 | 16 | 14 | 11 | 8 | 7 | 7 | 9 | 10 | 13 | 14 | 14 |
| Level | Extreme | Extreme | Extreme | Extreme | Very high | High | High | Very high | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 16 | Extreme |
| Feb | 16 | Extreme |
| Mar | 14 | Extreme |
| Apr | 11 | Extreme |
| May | 8 | Very high |
| Jun | 7 | High |
| Jul | 7 | High |
| Aug | 9 | Very high |
| Sep | 10 | Extreme |
| Oct | 13 | Extreme |
| Nov | 14 | Extreme |
| Dec | 14 | Extreme |
Air quality in Mount Isa 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 Mount Isa is worst in October — around 26 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (March, 11 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) | 14 | 11 | 11 | 17 | 19 | 18 | 17 | 19 | 22 | 26 | 20 | 24 |
| Level | Moderate | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 11 | Good |
| Mar | 11 | Good |
| Apr | 17 | Moderate |
| May | 19 | Moderate |
| Jun | 18 | Moderate |
| Jul | 17 | Moderate |
| Aug | 19 | Moderate |
| Sep | 22 | Moderate |
| Oct | 26 | Moderate |
| Nov | 20 | Moderate |
| Dec | 24 | Moderate |
Where is Mount Isa?
Mount Isa sits at 20.7°S, 139.5°E, 363 m above sea level, in Australia. The nearest listed city is Alice Springs, 666 km away.
Topography around Mount Isa
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mount Isa.
Within 3 km, the terrain around Mount Isa has only modest variations in elevation — a maximum elevation change of 243 m around an average of 364 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 341 m; within 80 km, significant variations in elevation — a maximum elevation change of 433 m.
The land around Mount Isa is covered by grassland (33%), artificial surfaces (29%) and bare terrain (20%) within 3 km, grassland (80%) within 16 km, and grassland (84%) 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 Isa (-20.7252°, 139.4973°, elevation 363 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.