Rottnest Island Long-term Averages

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Ann
Mean Max (°C)	26.7	27.3	26.1	23.8	21.2	18.8	17.9	18.0	19.0	20.6	23.1	25.3	22.3
Mean Min (°C)	19.2	19.5	18.7	17.2	15.2	13.4	12.5	12.4	13.0	14.1	15.9	17.8	15.7
Mean Rain (mm)	14.1	10.6	18.9	33.4	68.5	110.2	115.2	86.2	52.1	27.1	19.2	9.7	557.8
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	2.3	1.9	4.0	7.7	11.2	15.5	19.0	17.3	13.4	8.6	5.5	3.3	109.5

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	28.3	32.8	36.4	38.4	42.5	42.5
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	23.6	21.1	18.1	17.8	18.0	18.8	20.5	24.9	27.0	27.0
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	23.7	20.4	18.9	19.8	20.3	22.7	26.3	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	17.3	15.0	13.5	14.2	14.3	16.0	17.9	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	24.8	15.2	3.4	3.0	0.0	332.8

Rottnest Island Annual Temperatures & Rainfall

Rottnest Island Average Number of Days With Temperatures

	Jan	Feb	Mar	Apr	Sep	Oct	Nov	Dec	Ann
≥ 40°C	0.1	0.1	0.0	0.0	0.0	0.0	0.0	0.1	0.3
≥ 35°C	1.5	1.5	1.2	0.1	0.0	0.1	0.3	1.1	5.9
≥ 30°C	5.5	6.6	4.6	1.5	0.1	0.5	1.9	4.4	25.2
≤ 2°C	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1
≤ 0°C	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	35	37	36	36	34	36	36	34	36	35	36	35	35.0
Earliest Entry	1984	1984	1984	1984	1984	1984	1983	1986	1986	1985	1983	1990	1983
Latest Entry	2025	2025	2025	2024	2024	2024	2024	2024	2024	2024	2024	2024	2025
Years of Maxima	35	37	36	36	35	36	36	34	36	36	36	34	35.0
Earliest Entry	1984	1984	1984	1984	1984	1984	1983	1986	1986	1985	1983	1990	1983
Latest Entry	2025	2025	2025	2024	2024	2024	2024	2024	2024	2024	2024	2024	2025
Years of Rainfall	32	32	31	31	30	33	32	33	32	32	32	30	30.0
Earliest Entry	1984	1984	1984	1984	1990	1984	1983	1985	1986	1985	1983	1995	1983
Latest Entry	2025	2025	2025	2024	2024	2024	2024	2024	2024	2024	2024	2024	2025

Station Details

ROTTNEST ISLAND
Lower West, Western Australia

32.0069°S 115.5022°E 44m AMSL
Commenced 1983

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Months of rain in a day in southern WA

12:31 AEST Heavy rain has fallen in southern parts of Western Australia, with the heaviest day of rain (in any month) in at least 20 years at some locations.