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Monthly climate in Mount Isa, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Mount Isa features a hot semi-arid climate (BSh). Temperatures typically range between 18 °C (64 °F) and 32 °C (90 °F) through the year, but rarely can drop to 4 °C (40 °F) or can rise to as high as 44 °C (111 °F). The average annual precipitation amounts to about 289 mm (11.4 inches) and receives 28 rainy days on the 1 mm (0.04 inches) threshold annually. Mount Isa enjoys an average of 3636 hours of sunshine throughout the year, and daylight varies from 10 hours 52 minutes to 13 hours 21 minutes per day.

Monthly average temperatures in Mount Isa, Australia

The warmest months in Mount Isa are January, February and December, with daily mean temperatures ranging from 30 to 32 °C (86 - 90 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 18 to 20 °C (64 - 68 °F) throughout the day. On average each year, Mount Isa experiences 289 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Mount Isa. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum43°C
(110°F)		42°C
(107°F)		41°C
(106°F)		37°C
(99°F)		32°C
(91°F)		31°C
(89°F)		33°C
(91°F)		34°C
(94°F)		39°C
(102°F)		41°C
(105°F)		41°C
(107°F)		44°C
(111°F)
Mean maximum41°C
(106°F)		40°C
(104°F)		40°C
(104°F)		35°C
(96°F)		31°C
(89°F)		29°C
(84°F)		30°C
(87°F)		33°C
(92°F)		36°C
(97°F)		39°C
(103°F)		40°C
(104°F)		42°C
(108°F)
Average high36°C
(98°F)		35°C
(96°F)		35°C
(95°F)		32°C
(91°F)		27°C
(81°F)		25°C
(76°F)		25°C
(78°F)		27°C
(81°F)		31°C
(89°F)		35°C
(95°F)		36°C
(97°F)		38°C
(101°F)
Daily mean31°C
(88°F)		30°C
(86°F)		29°C
(85°F)		26°C
(79°F)		21°C
(70°F)		18°C
(64°F)		18°C
(65°F)		20°C
(68°F)		24°C
(75°F)		28°C
(83°F)		29°C
(85°F)		32°C
(90°F)
Average low26°C
(79°F)		24°C
(76°F)		23°C
(74°F)		20°C
(68°F)		15°C
(59°F)		11°C
(53°F)		11°C
(52°F)		12°C
(54°F)		16°C
(61°F)		21°C
(70°F)		23°C
(73°F)		25°C
(78°F)
Mean minimum23°C
(73°F)		20°C
(69°F)		20°C
(67°F)		15°C
(59°F)		9°C
(49°F)		7°C
(45°F)		6°C
(43°F)		8°C
(46°F)		11°C
(52°F)		15°C
(60°F)		16°C
(62°F)		19°C
(66°F)
Minimum22°C
(72°F)		18°C
(65°F)		18°C
(66°F)		11°C
(51°F)		6°C
(43°F)		4°C
(40°F)		4°C
(40°F)		6°C
(43°F)		9°C
(48°F)		15°C
(58°F)		13°C
(57°F)		17°C
(63°F)

Compare climate in Mount Isa with other places

Compare temperature, precipitation, sunshine, UV index in Mount Isa, Australia with other places around the world.

Monthly average precipitation in Mount Isa, Australia

Mount Isa usually has the most precipitation in January, February and March, with an average of 6 rainy days and 76 mm (3.0 inches) of precipitation per month. The driest months in Mount Isa are April, May and August. On average, 1 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Mount Isa. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)55 (2.1)85 (3.4)87 (3.4)1 (0.0)1 (0.0)6 (0.2)1 (0.1)0 (0.0)5 (0.2)10 (0.4)18 (0.7)20 (0.8)
Average precipitation days (≥ 1 mm)666000001243

Monthly sunshine hours in Mount Isa, Australia

The sunniest months in Mount Isa are October, November and December, when the sun shines an average of 10 hours 52 minutes a day. Least sunny months in Mount Isa: January, February and June receive an average of 9 hours 12 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Mount Isa. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours268284305297288276292308313330328341
Mean daily daylight hours13h 13m12h 45m12h 11m11h 35m11h 6m10h 52m10h 59m11h 24m11h 58m12h 33m13h 5m13h 21m

Solar UV radiation in Mount Isa, Australia

Mount Isa experiences the highest level of ultraviolet (UV) radiation in January, November and December, when the maximum UV index can reach values of 16 - 17, which corresponds to the Extreme category of sun exposure. May, June and July are in the High / Very High exposure category. In these months, the maximum values of the UV index do not exceed 9. For more detailed information, check out our hourly Mount Isa UV Index data.

Average daily maximum UV levels by month for Mount Isa. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)171615129781113141616