Perth weather in January
In January, Perth has an average high of 26 °C79 °F and an average low of 19 °C66 °F, with about 18 mm0.7 in of precipitation. It is the 2nd warmest month of the year and ranks 10th for precipitation.
How January compares with other months
Compared with December, January is 1.6 °C2.8 °F warmer on average and wetter by 6 mm0.2 in. Compared with February, January is 0.6 °C1 °F cooler on average. Daylight lasts about 14.0 hours around the middle of the month. Average relative humidity is 65% and the average cloud amount 33%.
Is January a good time to visit Perth?
Yes — January is one of the most comfortable months to visit Perth by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in January
For Perth in January, pack light summer clothes such as T-shirts, shorts or light dresses.
January in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Perth | 2679 | 1966 | 180.7 |
| Mandurah | 2780 | 1966 | 170.7 |
| Augusta | 2068 | 1864 | 200.8 |
| Roebourne | 39102 | 2679 | 773.0 |
| Marble Bar | 40103 | 2679 | 1054.2 |
Nearby places that are more than 1 °C1.8 °F warmer in January: Roebourne and Marble Bar; cooler: Augusta.
Other months in Perth
- January26 °C79 °F / 19 °C66 °F
- February27 °C80 °F / 20 °C68 °F
- March26 °C78 °F / 19 °C66 °F
- April23 °C73 °F / 17 °C63 °F
- May21 °C69 °F / 16 °C60 °F
- June19 °C66 °F / 14 °C58 °F
- July18 °C64 °F / 14 °C56 °F
- August18 °C64 °F / 13 °C56 °F
- September18 °C64 °F / 13 °C56 °F
- October20 °C68 °F / 14 °C58 °F
- November22 °C72 °F / 16 °C61 °F
- December24 °C76 °F / 18 °C64 °F
Frequently asked questions
How warm is Perth in January?
In January the average high in Perth is 26 °C (79 °F) and the average low is 19 °C (66 °F).
Does it rain a lot in Perth in January?
On average about 18 mm (0.7 in) of precipitation falls in January; it ranks 10th of the 12 months.
Is January the warmest month in Perth?
No. The warmest month in Perth is February, with an average high of 27 °C (80 °F). The coldest month is September, with an average low of 13 °C (56 °F).
How long is the day in Perth in January?
In the middle of January the day in Perth lasts about 14.0 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Perth in January?
The average relative humidity in January is about 65%. This is a long-term average for the whole day.
How cloudy is Perth in January?
On average about 33% of the sky is covered by cloud in January. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.