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Monthly climate in Rottnest Island, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Rottnest Island features a hot-summer Mediterranean climate (Csa). Temperatures typically range between 16 °C (61 °F) and 22 °C (72 °F) through the year, but rarely can drop to 10 °C (50 °F) or can rise to as high as 31 °C (88 °F). The average annual precipitation amounts to about 792 mm (31.2 inches) and receives 91 rainy days on the 1 mm (0.04 inches) threshold annually. Rottnest Island enjoys an average of 3695 hours of sunshine throughout the year, and daylight varies from 10 hours 4 minutes to 14 hours 11 minutes per day.

Monthly average temperatures in Rottnest Island, Australia

The warmest months in Rottnest Island are January, February and March, with daily mean temperatures ranging from 22 to 22 °C (71 - 72 °F) throughout the day. The coldest temperatures usually occur in July, August and September, when daily mean temperatures range from 16 to 17 °C (61 - 62 °F) throughout the day. On average each year, Rottnest Island experiences 36 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 Rottnest Island. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum29°C
(85°F)		31°C
(88°F)		30°C
(86°F)		27°C
(81°F)		24°C
(76°F)		22°C
(72°F)		21°C
(70°F)		21°C
(70°F)		24°C
(75°F)		26°C
(80°F)		27°C
(82°F)		31°C
(88°F)
Mean maximum28°C
(82°F)		29°C
(84°F)		28°C
(83°F)		26°C
(79°F)		23°C
(73°F)		21°C
(69°F)		20°C
(69°F)		20°C
(69°F)		21°C
(71°F)		24°C
(76°F)		25°C
(78°F)		29°C
(85°F)
Average high24°C
(75°F)		24°C
(76°F)		24°C
(75°F)		22°C
(72°F)		20°C
(69°F)		19°C
(66°F)		18°C
(65°F)		17°C
(63°F)		18°C
(64°F)		19°C
(66°F)		20°C
(69°F)		23°C
(73°F)
Daily mean22°C
(71°F)		22°C
(72°F)		22°C
(72°F)		20°C
(69°F)		18°C
(66°F)		17°C
(63°F)		17°C
(62°F)		16°C
(61°F)		16°C
(62°F)		17°C
(63°F)		19°C
(66°F)		21°C
(70°F)
Average low20°C
(68°F)		20°C
(69°F)		20°C
(69°F)		19°C
(66°F)		17°C
(62°F)		16°C
(61°F)		15°C
(59°F)		14°C
(58°F)		15°C
(59°F)		16°C
(60°F)		17°C
(63°F)		19°C
(67°F)
Mean minimum17°C
(62°F)		17°C
(63°F)		16°C
(62°F)		15°C
(59°F)		14°C
(57°F)		13°C
(55°F)		12°C
(55°F)		11°C
(53°F)		11°C
(53°F)		12°C
(54°F)		13°C
(56°F)		15°C
(59°F)
Minimum15°C
(59°F)		16°C
(61°F)		15°C
(60°F)		13°C
(56°F)		12°C
(54°F)		11°C
(53°F)		12°C
(54°F)		11°C
(52°F)		10°C
(50°F)		11°C
(52°F)		13°C
(55°F)		14°C
(58°F)

Compare climate in Rottnest Island with other places

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

Monthly average precipitation in Rottnest Island, Australia

Rottnest Island usually has the most precipitation in June, July and August, with an average of 15 rainy days and 146 mm (5.8 inches) of precipitation per month. The driest months in Rottnest Island are March, April and December. On average, 17 mm (0.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rottnest Island. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)35 (1.4)62 (2.5)19 (0.7)25 (1.0)80 (3.1)158 (6.2)143 (5.6)138 (5.4)49 (1.9)49 (1.9)27 (1.1)8 (0.3)
Average precipitation days (≥ 1 mm)14431013191510732

Monthly sunshine hours in Rottnest Island, Australia

The sunniest months in Rottnest Island are October, November and December, when the sun shines an average of 11 hours 34 minutes a day. Least sunny months in Rottnest Island: May, June and July receive an average of 8 hours 50 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rottnest Island. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours308315322289279261272285296329351383
Mean daily daylight hours13h 57m13h 12m12h 14m11h 16m10h 28m10h 4m10h 16m10h 58m11h 53m12h 52m13h 44m14h 11m

Solar UV radiation in Rottnest Island, Australia

Rottnest Island experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 14 - 14, which corresponds to the Extreme category of sun exposure. May, June and July are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Rottnest Island UV Index data.

Average daily maximum UV levels by month for Rottnest Island. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)141411964468111314