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Australia weather

Weather in Mount Isa for September 2026

Your guide to Mount Isa weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Mount Isa is slightly cooler than the historical average by 1.2 °C.

  • Expect cooler weather in the next days in Mount Isa with the forecast suggesting a temperature of 28.5 °C, lower than the historical average.

  • In general, the average temperature in Mount Isa at the beginning of September is 30.3 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 31.6 °C by the end of September.

    • Rain 🌧️

  • Precipitation in Mount Isa during September is a rare event, with an average of fewer than 2 rainy days.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
30
Dry days
Average rainy days
0
Rainy days
Average snowy days
0
Snow days
Average temperatures
31°/19°
Temperatures
Average wind speed
30 km/h
Avg max wind
Average humidity
25 %
Avg humidity

Mount Isa Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
28°
2
Sunny
29°
3
Sunny
30°
4
Sunny
30°
5
Sunny
31°
6
Sunny
32°
7
Sunny
32°
8
Sunny
31°
9
Sunny
32°
10
Sunny
30°
11
Sunny
29°
12
Sunny
28°
13
Sunny
30°
14
Sunny
30°
15
Sunny
30°
16
Sunny
30°
17
Sunny
27°
18
Sunny
27°
19
Sunny
26°
20
Sunny
27°
21
Sunny
28°
22
Sunny
29°
23
Sunny
29°
24
Sunny
29°
25
Sunny
29°
26
Sunny
31°
27
Sunny
31°
28
Sunny
33°
29
Sunny
34°
30
Sunny
34°

Temperatures trend during September in Mount Isa

See the weather trend as well as the moving average line

September weather in Mount Isa day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 28° /15° 0 mm 8
2 Sept. Sunny
Sunny
 29° /16° 0 mm 9
3 Sept. Sunny
Sunny
 30° /17° 0 mm 9
4 Sept. Sunny
Sunny
 30° /17° 0 mm 8
5 Sept. Sunny
Sunny
 31° /19° 0 mm 9
6 Sept. Sunny
Sunny
 32° /21° 0.2 mm 9
7 Sept. Sunny
Sunny
 32° /21° 0 mm 9
8 Sept. Sunny
Sunny
 31° /19° 0 mm 9
9 Sept. Sunny
Sunny
 32° /18° 0 mm 9
10 Sept. Sunny
Sunny
 30° /18° 0.1 mm 9
11 Sept. Sunny
Sunny
 29° /16° 0 mm 8
12 Sept. Sunny
Sunny
 28° /20° 0 mm 10.3
13 Sept. Sunny
Sunny
 30° /21° 0 mm 11.2
14 Sept. Sunny
Sunny
 30° /21° 0 mm 11.2
15 Sept. Sunny
Sunny
 30° /20° 0 mm 10.7
16 Sept. Sunny
Sunny
 30° /21° 0 mm 8
17 Sept. Sunny
Sunny
 27° /15° 0 mm 8
18 Sept. Sunny
Sunny
 27° /19° 0 mm 8
19 Sept. Sunny
Sunny
 26° /18° 0 mm 8
20 Sept. Sunny
Sunny
 27° /19° 0 mm 8
21 Sept. Sunny
Sunny
 28° /21° 0 mm 8
22 Sept. Sunny
Sunny
 29° /21° 0 mm 8
23 Sept. Sunny
Sunny
 29° /21° 0 mm 8
24 Sept. Sunny
Sunny
 29° /22° 0 mm 8
25 Sept. Sunny
Sunny
 29° /22° 0 mm 8
26 Sept. Sunny
Sunny
 31° /20° 0.7 mm 8
27 Sept. Sunny
Sunny
 31° /19° 0 mm 9
28 Sept. Sunny
Sunny
 33° /18° 0 mm 9
29 Sept. Sunny
Sunny
 34° /20° 0 mm 9
30 Sept. Sunny
Sunny
 34° /21° 0 mm 9
Next
Important Notice
Our weather forecast for Mount Isa in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Mount Isa forecast closer to your planned date for the most up-to-date weather information.
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Mount Isa in September - FAQ

What are the expected maximum and minimum temperatures in Mount Isa during September?
Expect warm days with temperatures around 31°, cooling to mild conditions of 19° after sunset. Perfect for those who enjoy warm weather.

How much rainfall should be expected in Mount Isa during September?
Rainfall in Mount Isa during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 0 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.

What are the typical wind conditions in Mount Isa during September?
The average wind speed in Mount Isa during September is 30 km/h, suggesting breezy to windy conditions, depending on your activities.

UV exposure in Mount Isa during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Mount Isa?

Get accurate weather forecasts for Mount Isa, located at latitude -20.725 and longitude 139.497. Stay updated with localized weather information tailored for Mount Isa.

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