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Monthly climate in Rottnest Island, Western Australia, Australia

Last updated: May 6, 2024

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, Western Australia, 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, Western Australia, Australia.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 29°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 maximum 28°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 high 24°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 mean 22°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 low 20°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 minimum 17°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)
Minimum 15°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, Western Australia, Australia with other places around the world.

Monthly average precipitation in Rottnest Island, Western Australia, 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, Western Australia, Australia.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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) 1 4 4 3 10 13 19 15 10 7 3 2

Monthly sunshine hours in Rottnest Island, Western Australia, 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, Western Australia, Australia.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 308 315 322 289 279 261 272 285 296 329 351 383
Mean daily daylight hours 13h 57m 13h 12m 12h 14m 11h 16m 10h 28m 10h 4m 10h 16m 10h 58m 11h 53m 12h 52m 13h 44m 14h 11m

Solar UV radiation in Rottnest Island, Western Australia, 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, Western Australia, Australia.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 14 14 11 9 6 4 4 6 8 11 13 14