Rottnest Island Climate

Rottnest Island Long-term Averages

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Mean Max (°C)
26.5 27.2 26.0 23.8 21.1 18.8 17.8 17.9 18.9 20.6 23.0 25.1 22.2
Mean Min (°C)
19.1 19.4 18.6 17.3 15.2 13.4 12.4 12.4 13.0 14.1 15.9 17.7 15.7
Mean Rain (mm)
16.0 12.1 19.2 33.5 71.1 107.4 114.7 89.5 54.1 27.5 20.2 10.5 563.0
Median Rain (mm)
1.4 2.5 11.2 23.6 58.0 103.7 118.6 89.3 54.6 21.5 18.0 2.6 516.6
Mean Rain Days
2.4 2.1 4.0 7.9 11.1 15.0 18.4 17.1 13.6 8.2 5.4 3.6 108.6

Rottnest Island Daily Records

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High Max (°C)
41.9 41.5 40.8 38.0 29.2 24.9 26.5 25.3 30.8 35.2 36.6 40.6 41.9
Low Max (°C)
19.4 18.0 17.2 16.3 14.0 13.0 12.6 12.4 13.3 14.1 15.0 18.4 12.4
High Min (°C)
26.4 25.7 26.0 23.4 21.1 18.0 17.4 18.0 18.8 20.1 22.2 25.7 26.4
Low Min (°C)
11.3 10.0 2.3 4.0 1.8 3.9 0.0 6.1 6.7 6.7 6.6 10.8 0.0
High Rain (mm)
142.2 93.8 38.0 49.8 61.6 154.7 66.8 34.6 42.0 58.0 52.0 36.2 154.7

Rottnest Island Monthly Records

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High Mn. Max (°C)
29.7 30.1 28.3 26.0 22.6 20.4 18.9 19.8 20.2 22.6 25.9 28.1 23.2
Low Mn. Max (°C)
24.6 25.3 23.8 21.4 19.9 17.0 16.8 16.7 17.0 18.5 20.4 21.5 21.2
High Mn. Min (°C)
20.8 21.7 20.8 19.3 16.9 15.0 13.5 14.2 14.3 16.0 17.5 19.8 16.6
Low Mn. Min (°C)
17.7 17.3 14.6 15.4 13.9 12.0 11.1 11.4 11.1 12.3 14.2 15.6 14.8
High Rain (mm)
143.2 104.0 61.4 152.2 179.6 282.6 213.8 126.2 107.0 98.8 54.4 70.0 792.6
Low Rain (mm)
0.0 0.0 0.0 0.0 12.4 11.8 54.8 31.8 15.2 5.0 3.2 0.0 332.8

Rottnest Island Annual Temperatures & Rainfall

ROTTNEST ISLAND

Mean daily minimum temp
Mean daily maximum temp
Highest/lowest on record
Highest/lowest on record
Mean monthly rainfall

Rottnest Island Average Number of Days With Temperatures

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
≥ 40.0°C
0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3
≥ 35.0°C
1.4 1.4 1.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.3 1.1 5.5
≥ 30.0°C
5.3 6.6 4.7 1.4 0.0 0.0 0.0 0.0 0.0 0.5 1.8 4.4 24.6
≤ 2.0°C
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1
≤ 0.0°C
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

Rottnest Island 'per Week' Values (14th/86th Percentiles)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High Max
30.3 32.1 30.0 27.0 23.5 20.8 19.6 19.8 20.8 22.7 25.9 29.4 26.4
Low Max
22.9 23.2 22.3 20.6 18.5 16.3 15.7 15.7 16.5 17.7 19.8 21.4 17.5
High Min
21.1 21.8 21.1 19.6 17.6 15.4 14.3 14.1 14.8 16.0 17.9 20.0 19.3
Low Min
16.6 17.0 15.9 14.8 13.0 11.0 10.2 10.3 10.9 11.6 13.3 15.0 11.9

Rottnest Island Data Availability

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Years of Minima
31 33 33 33 31 33 32 30 32 31 32 31 31.0
Earliest Entry
1984 1984 1984 1984 1984 1984 1983 1986 1986 1985 1983 1990 1983
Latest Entry
2021 2021 2021 2021 2021 2021 2021 2020 2020 2020 2020 2020 2021
Years of Maxima
31 33 33 33 32 33 32 30 32 32 32 30 31.0
Earliest Entry
1984 1984 1984 1984 1984 1984 1983 1986 1986 1985 1983 1990 1983
Latest Entry
2021 2021 2021 2021 2021 2021 2021 2020 2020 2020 2020 2020 2021
Years of Rainfall
28 28 28 28 27 30 28 29 28 28 28 26 26.0
Earliest Entry
1984 1984 1984 1984 1990 1984 1983 1985 1986 1985 1983 1995 1983
Latest Entry
2021 2021 2021 2021 2021 2021 2021 2020 2020 2020 2020 2020 2021

Station Details

ROTTNEST ISLAND
Lower West, Western Australia
32.0069°S 115.5022°E 43m AMSL
Commenced 1983
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