Mount Isa in Fall
In fall (March, April and May), Mount Isa sees average daytime highs around 31°C and overnight lows near 19°C, with 82 mm of rain over about 7 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 34°C in early March to 26°C by late May. The sky is clear or mostly clear about 65% of the time across fall, and the air most often feels dry.
Fall is Mount Isa's 2nd-best season to visit on our travel score. For the whole year in context, see Mount Isa's year-round climate.
- Avg daytime high
- 31°C
- 3rd-warmest season
- Avg overnight low
- 19°C
- Rainfall
- 82 mm
- 7 wet days
- Avg wind
- 18 km/h
- Travel score
- 5.7
- 2nd-best season
- Months
- Mar · Apr · May
Temperature in Mount Isa in Fall
Over the season highs ease from about 34°C in early March to 26°C by late May.
A typical fall day in Mount Isa reaches about 31°C and drops to 19°C overnight. The warmest of the three months is March, the coolest May.
How fall really feels in Mount Isa
Once humidity and wind are folded in, fall brings about 45 days that feel above 32°C and 0 that feel at or below 0°C.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Mount Isa weather by month
How the three fall months (March, April and May) 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 Fall
The sky is clear or mostly clear about 65% of the time across fall.
Chance of precipitation in Fall
Mount Isa gets around 82 mm of rain over 7 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 18 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 24 min in early March to 10 h 48 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 5.6 kWh/m².
Is fall a good time to visit Mount Isa?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall 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 Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Mount Isa sees daytime highs around 31°C and nights near 19°C. Pack light clothes and sun protection. About 7 days see rain.
UV index in Mount Isa in Fall
Clear-sky midday UV across fall 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 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 Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall 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.