Mount Isa weather by month & the best time to visit
Australia · small town · semi-arid climate
The best time to visit Mount Isa is May — its sunniest month (Sunshine Score 99/100), with July and August close behind. Mount Isa averages about 3,655 hours of sunshine a year. Daytime highs around 28°C / 82°F and roughly 8 mm of rain in May.
When is the best time to visit Mount Isa?
For sunshine, the best time to visit Mount Isa is May, then July and August. The dullest month is December (35/100, 70 mm of rain). The full month-by-month picture is in the table below.
How sunny is Mount Isa?
Mount Isa is one of the sunniest places on Earth: about 3,655 hours of sunshine a year. 64 Sunshine Score points separate May (99) from December (35), so the month you pick matters. It ranks #20 of 118 destinations in Australia for annual sunshine, above the national median of 3,071 hours. Rain is strongly seasonal here: roughly 67% of the year's 471 mm falls in the three months around January.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV |
|---|---|---|---|---|---|
| January | 44 | 36° / 97°F | 24° / 75°F | 144 mm | 13 |
| February | 57 | 35° / 95°F | 23° / 73°F | 100 mm | 13 |
| March | 62 | 35° / 95°F | 21° / 70°F | 60 mm | 12 |
| April | 88 | 33° / 91°F | 19° / 66°F | 15 mm | 10 |
| May | 99 | 28° / 82°F | 14° / 57°F | 8 mm | 7 |
| June | 98 | 25° / 77°F | 10° / 50°F | 12 mm | 6 |
| July | 99 | 25° / 77°F | 10° / 50°F | 3 mm | 6 |
| August | 99 | 28° / 82°F | 11° / 52°F | 3 mm | 8 |
| September | 89 | 33° / 91°F | 16° / 61°F | 5 mm | 10 |
| October | 49 | 37° / 99°F | 20° / 68°F | 13 mm | 12 |
| November | 37 | 38° / 100°F | 23° / 73°F | 38 mm | 12 |
| December | 35 | 38° / 100°F | 25° / 77°F | 70 mm | 12 |
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Mount Isa: questions and answers
What kind of destination is Mount Isa?
Mount Isa is a small town in Australia at 337 m elevation with a semi-arid climate.
How many hours of sunshine does Mount Isa get a year?
Mount Isa gets about 3,655 hours of sunshine a year, at its best around May.
When is the best time to visit Mount Isa?
The sunniest time to visit Mount Isa is May, when the Sunshine Score peaks at 99/100 (with July and August close behind). Expect daytime highs around 28°C / 82°F.
What is the least sunny month in Mount Isa?
December is the least sunny month in Mount Isa, scoring 35/100 with about 70 mm of rain.
How strong is the sun in Mount Isa?
The typical midday UV index in Mount Isa peaks around 13 (extreme) in January, easing to about 6 (high) in June. Month-by-month midday UV values are in the UV column of the table on this page.
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