Mount Isa Weather and Climate
Climate Snapshot
Mount Isa's warmest month in 2024 was December, averaging 37.7 degrees. That gives Mount Isa an annual average daytime high of 31.3 degrees, 4.2 degrees warmer than the Queensland mean.
Daytime highs peak at 37.7 degrees in December and bottom out with overnight lows of 11.2 degrees in July. That is a 26.5 degree spread from hottest afternoon to coldest night. Overnight minimums average 19.9 degrees across the year, 1.4 degrees warmer than the Queensland average of 18.5.
Annual rainfall totals 551mm across 64 rain days, 59 percent drier than the Queensland average. The wettest month is January at 176mm, and August is the driest at 0mm.
Most of the rain falls in the warmer months, giving you those classic summer afternoon storms.
When we crunch the numbers on temperature, humidity, UV, and rainfall, June comes out as the sweet spot with a Comfort Score of 10.0 out of 10. December sits at the other end at 1.0.
Scroll down for the full month-by-month breakdown, or jump straight to June if you're picking the best time to visit Mount Isa.
Monthly Comfort Score
Our Comfort Score rates each month from 1 (tough) to 10 (ideal) based on temperature, humidity, rainfall, UV, and sunshine. How we calculate it
Annual Comfort Score: 5.3/10 - Ranked #177 of 213 Australian cities (national avg 6.2, QLD avg 6.7)
Seasonal Overview
| Season | Avg Max °C | Avg Min °C | Total Rain mm | Comfort |
|---|---|---|---|---|
| Summer | 34.4 | 24.4 | 324 | 2.6 |
| Autumn | 30.0 | 19.5 | 122 | 6.5 |
| Winter | 25.8 | 13.1 | 19 | 9.2 |
| Spring | 34.9 | 22.6 | 86 | 3.1 |
Monthly Climate Averages
| Month | Max °C | Min °C | Rain mm | Rain Days | Solar MJ | Humidity % | Comfort |
|---|
Weather by Month
Detailed climate data, packing advice, and what to expect for each month in Mount Isa.
34.3°C, 176mm rain February
31.2°C, 132mm rain March
31.9°C, 113mm rain April
30.0°C, 1mm rain May
28.1°C, 8mm rain June
24.6°C, 4mm rain July
23.3°C, 15mm rain August
29.5°C, 0mm rain September
32.0°C, 0mm rain October
36.3°C, 11mm rain November
36.4°C, 75mm rain December
37.7°C, 16mm rain
Compare and Explore
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