Perth climate
Perth is warmest in February, with average highs of 31 °C, and coldest in July, when nights average 9.3 °C. July is the wettest month (103 mm) and December the driest (9.7 mm). Figures are 1991–2020 climate normals.
Across a full year Perth averages 550 mm of rain and 137 days above 25 °C.
Australia · population 2,384,371 · 1991–2020 normals
Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month
- Warmest month February 31 °C
- Coldest month July 9.3 °C
- Driest month December 10 mm
- Wettest month July 103 mm
- Least cloud January 22 % cloud
- Hottest on record February 45 °C
- Coldest on record May 3.6 °C
- Warmest sea February 22 °C
What to expectPerth through the year
Perth has a clear annual cycle: average daily highs run from 17 °C in July to 31 °C in February, a swing of 12 °C in mean temperature across the year.
Counted across a normal year, 137 days a year reach 25 °C, 69 of them reach 30 °C. The warmest reading in the 1991–2020 record is 45 °C, in February.
Rain is strongly seasonal. July averages 103 mm against 10 mm in December — 11 times as much. Planning around the dry months matters more here than planning around temperature.
The sea off Perth is warmest in February at 22 °C and coldest in September at 19 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 31.0 °C | 16 mm | 22 % |
| February | 31.1 °C | 15 mm | 25 % |
| March | 28.8 °C | 19 mm | 30 % |
| April | 24.8 °C | 25 mm | 41 % |
| May | 20.9 °C | 69 mm | 45 % |
| June | 18.0 °C | 99 mm | 48 % |
| July | 16.8 °C | 103 mm | 48 % |
| August | 17.3 °C | 90 mm | 47 % |
| September | 18.5 °C | 56 mm | 44 % |
| October | 21.9 °C | 29 mm | 38 % |
| November | 25.5 °C | 19 mm | 36 % |
| December | 28.8 °C | 10 mm | 25 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | 31.0 °C | 18.9 °C | 24.6 °C | 44.2 °C | 11.8 °C | 27 | 18 | 0 |
| February | 31.1 °C | 19.1 °C | 24.7 °C | 44.8 °C | 12.6 °C | 25 | 17 | 0 |
| March | 28.8 °C | 17.7 °C | 22.9 °C | 40.8 °C | 9.4 °C | 24 | 13 | 0 |
| April | 24.8 °C | 15.2 °C | 19.6 °C | 36.1 °C | 8.3 °C | 13 | 3 | 0 |
| May | 20.9 °C | 12.2 °C | 16.3 °C | 32.7 °C | 3.6 °C | 3 | 0 | 0 |
| June | 18.0 °C | 10.3 °C | 13.9 °C | 24.8 °C | 4.1 °C | 0 | 0 | 0 |
| July | 16.8 °C | 9.3 °C | 12.9 °C | 22.8 °C | 3.8 °C | 0 | 0 | 0 |
| August | 17.3 °C | 9.6 °C | 13.3 °C | 25.5 °C | 4.0 °C | 0 | 0 | 0 |
| September | 18.5 °C | 10.6 °C | 14.3 °C | 31.4 °C | 4.0 °C | 1 | 0 | 0 |
| October | 21.9 °C | 12.5 °C | 16.9 °C | 35.6 °C | 5.7 °C | 6 | 1 | 0 |
| November | 25.5 °C | 15.2 °C | 20.0 °C | 38.8 °C | 6.7 °C | 15 | 6 | 0 |
| December | 28.8 °C | 17.3 °C | 22.7 °C | 42.3 °C | 10.3 °C | 23 | 12 | 0 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind | Sea temp |
|---|---|---|---|---|---|---|---|
| January | 16 mm | 2 | 14 h/day | 22 % | 51 % | 29 km/h | 21.8 °C |
| February | 15 mm | 1 | 13 h/day | 25 % | 52 % | 28 km/h | 22.3 °C |
| March | 19 mm | 2 | 12 h/day | 30 % | 55 % | 26 km/h | 22.3 °C |
| April | 25 mm | 4 | 11 h/day | 41 % | 63 % | 23 km/h | 22.1 °C |
| May | 69 mm | 8 | 11 h/day | 45 % | 69 % | 23 km/h | 21.6 °C |
| June | 99 mm | 11 | 10 h/day | 48 % | 74 % | 24 km/h | 20.8 °C |
| July | 103 mm | 13 | 10 h/day | 48 % | 76 % | 25 km/h | 19.9 °C |
| August | 90 mm | 11 | 11 h/day | 47 % | 75 % | 25 km/h | 19.1 °C |
| September | 56 mm | 9 | 12 h/day | 44 % | 73 % | 26 km/h | 18.7 °C |
| October | 29 mm | 5 | 13 h/day | 38 % | 66 % | 26 km/h | 18.8 °C |
| November | 19 mm | 4 | 14 h/day | 36 % | 58 % | 28 km/h | 19.8 °C |
| December | 10 mm | 2 | 14 h/day | 25 % | 52 % | 29 km/h | 20.8 °C |
Where Perth ranks
| Ranking | Position | Value |
|---|---|---|
| Best beach destinations in the world in March | 40thof 50 | 95/100 |
| Best beach destinations in the world in April | 45thof 50 | 90/100 |
Planning a trip? See the best time to visit Perth.
QuestionsCommon questions about Perth’s climate
When is the best time to visit Perth?
That depends on what you want, so the honest answer is a comparison rather than a single month. April, November, December sit closest to 20 °C on average, February is the warmest month and December the driest. The month-by-month table above has the full picture.
How hot does Perth get?
In February, the warmest month, daily highs average 31 °C. About 69 days a year pass 30 °C. The highest value in the 1991–2020 record is 45 °C.
How cold does it get in winter?
Nights average 9.3 °C in July, the coldest month. Freezing nights are not part of a normal year here.
Which month is wettest in Perth?
July, averaging 103 mm over 13 days with rain. The driest month is December with 10 mm. The year as a whole averages 550 mm.
Are these figures a forecast?
No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Perth rather than what any particular week will bring. Individual years can differ substantially from the normal.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.