Mount Isa in Spring
In spring (September, October and November), Mount Isa sees average daytime highs around 34°C and overnight lows near 19°C, with 45 mm of rain over about 8 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Over the season highs climb from about 29°C in early September to 36°C by late November. The sky is clear or mostly clear about 76% of the time across spring, and the air most often feels dry.
Spring is Mount Isa's 3rd-best season to visit on our travel score. For the whole year in context, see Mount Isa's year-round climate.
- Avg daytime high
- 34°C
- 2nd-warmest season
- Avg overnight low
- 19°C
- Rainfall
- 45 mm
- 8 wet days
- Avg wind
- 17 km/h
- Travel score
- 4.1
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Mount Isa in Spring
Over the season highs climb from about 29°C in early September to 36°C by late November.
A typical spring day in Mount Isa reaches about 34°C and drops to 19°C overnight. The warmest of the three months is November, the coolest September.
How spring really feels in Mount Isa
Once humidity and wind are folded in, spring brings about 71 days that feel above 32°C and 0 that feel at or below 0°C.
The story in spring is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Mount Isa weather by month
How the three spring months (September, October and November) 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 Spring
The sky is clear or mostly clear about 76% of the time across spring.
Chance of precipitation in Spring
Mount Isa gets around 45 mm of rain over 8 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 17 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 36 min in early September to 13 h 12 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 7.1 kWh/m².
Is spring a good time to visit Mount Isa?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a reasonable time to visit Mount Isa for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Mount Isa in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Mount Isa sees daytime highs around 34°C and nights near 19°C. Pack light clothes and sun protection. About 8 days see rain.
UV index in Mount Isa in Spring
Clear-sky midday UV across spring averages 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 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 Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring 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.