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Australia weather

Weather in Mount Isa for September 2025

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

    Temperatures

  • Until now, September 2025 in Mount Isa is slightly cooler than the historical average by -1.4 °C.

  • The forecast for the upcoming days in Mount Isa predicts a temperature of 31.1 °C, which is slightly above the historical average.

  • In general, the average temperature in Mount Isa at the beginning of September is 30.6 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 29.9 °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
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
31°/19°
Temperatures
Average wind speed
30 km/h
Avg max wind
Average humidity
24 %
Avg humidity

Mount Isa Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Sunny
28°
2
Sunny
30°
3
Sunny
30°
4
Sunny
30°
5
Sunny
32°
6
Sunny
32°
7
Sunny
32°
8
Sunny
31°
9
Sunny
31°
10
Sunny
30°
11
Sunny
29°
12
Sunny
28°
13
Sunny
27°
14
Sunny
29°
15
Sunny
30°
16
Sunny
32°
17
Partly cloudy
34°
18
Sunny
35°
19
Sunny
34°
20
Patchy rain possible
34°
21
Partly cloudy
32°
22
Sunny
30°
23
Sunny
29°
24
Sunny
27°
25
Sunny
28°
26
Sunny
29°
27
Sunny
32°
28
Sunny
31°
29
Sunny
29°
30
Sunny
33°

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
 30° /15° 0 mm 9
3 Sept. Sunny
Sunny
 30° /16° 0 mm 9
4 Sept. Sunny
Sunny
 30° /17° 0 mm 8
5 Sept. Sunny
Sunny
 32° /18° 0 mm 9
6 Sept. Sunny
Sunny
 32° /20° 0.2 mm 9
7 Sept. Sunny
Sunny
 32° /20° 0 mm 9
8 Sept. Sunny
Sunny
 31° /19° 0 mm 9
9 Sept. Sunny
Sunny
 31° /18° 0 mm 9
10 Sept. Sunny
Sunny
 30° /18° 0.1 mm 8
11 Sept. Sunny
Sunny
 29° /16° 0 mm 8
12 Sept. Sunny
Sunny
 28° /16° 0 mm 8
13 Sept. Sunny
Sunny
 27° /15° 0 mm 8
14 Sept. Sunny
Sunny
 29° /16° 0 mm 8
15 Sept. Sunny
Sunny
 30° /18° 0 mm 9
16 Sept. Sunny
Sunny
 32° /20° 0 mm 2.7
17 Sept. Partly cloudy
Partly cloudy
 34° /24° 0 mm 2.5
18 Sept. Sunny
Sunny
 35° /23° 0 mm 2.3
19 Sept. Sunny
Sunny
 34° /24° 0.1 mm 2.5
20 Sept. Patchy rain possible
Patchy rain possible
 34° /23° 0.5 mm 7
21 Sept. Partly cloudy
Partly cloudy
 32° /23° 0 mm 8
22 Sept. Sunny
Sunny
 30° /19° 0 mm 7
23 Sept. Sunny
Sunny
 29° /18° 0 mm 7
24 Sept. Sunny
Sunny
 27° /16° 0 mm 7
25 Sept. Sunny
Sunny
 28° /14° 0 mm 7
26 Sept. Sunny
Sunny
 29° /16° 0 mm 7
27 Sept. Sunny
Sunny
 32° /18° 0 mm 7
28 Sept. Sunny
Sunny
 31° /19° 0 mm 7
29 Sept. Sunny
Sunny
 29° /15° 0 mm 7
30 Sept. Sunny
Sunny
 33° /20° 0 mm 9
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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 1 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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