Annual mean 25°C · wettest around January · prevailing wind E
Warmest
37.3 °C
Coldest
22.6 °C
Wettest
18%
Windiest
5.3 m/s
Prevailing
E
4.8 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Mount Isa over the whole year is 25°C. December is the hottest month, with highs of about 37°C; July is the coldest, with lows of about 10°C. Mount Isa has no sharply defined rainy season: the chance of rain on a given day runs from 1% in August, the driest month, to 16% in January, the wettest. Winds in Mount Isa are highest in May, averaging 3.9 m/s (14 km/h), and lightest in March, at 3.4 m/s (12 km/h). The prevailing wind is from the E. The clearest skies in Mount Isa come in August, when the sky is typically 14% covered; February is the cloudiest month, at 34%.
Month by month Mount Isa climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
35°C
26°C
35°C
16%
34%
3.7 m/s
2
33
0
February
34°C
24°C
33°C
13%
34%
3.7 m/s
8
50
1
March
33°C
23°C
32°C
12%
33%
3.4 m/s
11
57
1
April
31°C
20°C
28°C
1%
20%
3.6 m/s
47
79
13
May
27°C
16°C
23°C
1%
19%
3.9 m/s
82
41
51
June
24°C
11°C
19°C
2%
17%
3.4 m/s
81
17
76
July
23°C
10°C
19°C
3%
20%
3.4 m/s
79
13
79
August
26°C
12°C
21°C
1%
14%
3.5 m/s
82
27
65
September
30°C
16°C
25°C
3%
18%
3.7 m/s
68
62
30
October
34°C
20°C
29°C
4%
19%
3.7 m/s
33
68
11
November
35°C
24°C
32°C
8%
26%
3.8 m/s
17
52
5
December
37°C
26°C
34°C
8%
24%
3.7 m/s
5
36
1
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Mount Isa weather by season
Year round, Mount Isa has days of about 23°C at their warmest in July, its coolest month, and 37°C in December, its warmest; the coolest hours of the day run from 10°C to 26°C through the year, and the average temperature over the year is 25°C around the clock. Rain is most likely around January and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Mount Isa weather in winterJune to August
High 24°CLow 11°CRain 2%
Winter in Mount Isa has typical daily highs of about 24°C and lows of about 11°C, with a 2% chance of rain on a given day.
Mount Isa weather in springSeptember to November
High 33°CLow 20°CRain 5%
Spring in Mount Isa has typical daily highs of about 33°C and lows of about 20°C, with a 5% chance of rain on a given day.
Mount Isa weather in summerDecember to February
High 35°CLow 25°CRain 12%
Summer in Mount Isa has typical daily highs of about 35°C and lows of about 25°C, with a 12% chance of rain on a given day.
Mount Isa weather in autumnMarch to May
High 30°CLow 19°CRain 5%
Autumn in Mount Isa has typical daily highs of about 30°C and lows of about 19°C, with a 5% chance of rain on a given day.
When is the rainy season in Mount Isa?
Mount Isa has no sharply defined rainy season: the chance of rain on a given day runs from 1% in August, the driest month, to 16% in January, the wettest.
What time of year is Mount Isa windiest?
Winds in Mount Isa are highest in May, averaging 3.9 m/s (14 km/h), and lightest in March, at 3.4 m/s (12 km/h). The prevailing wind is from the E.
What is the average temperature in Mount Isa year round?
The average temperature in Mount Isa over the whole year is 25°C. December is the hottest month, with highs of about 37°C; July is the coldest, with lows of about 10°C.