Climate in Western Australia

Average daytime and nighttime temperatures

All climatic diagrams on this site result from the collected data from twenty-four measuring weather stations in Western Australia.
Weather stations at an altitude above 600m have not been included.
All data correspond to the average monthly values of the last 20 years.

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Several months of the year it is warm to hot at temperatures continuously above 25 degrees centigrade, sometimes up to 33 degrees.
Overview: Climate in Australia
Daylengths and sun positions in Australia
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in Western Australia
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 10 hours per day, November is the sunniest month in the state of Western Australia. In June the sun shines the shortest.
Rainy days per monthRainy days per month in Western Australia
A rainy day is a day on which at least an amount of 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 7 rainy days, July offers the most number of rainy days, and in December the least.
Precipitation in mm/dayPrecipitation in Western Australia
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.6 mm, the least rain falls in October. June, on the other hand, has the most rain.
Relative humidity in %Relative humidity in Western Australia
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture of the physically possible is actually contained in the air. At high humidity, the person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% gives as pleasant. With only 55% humidity on average, it is quite dry in December. The highest value of 66% is experienced here in July.
Absolute humidity in g/m³Absolute humidity in Western Australia
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy. This limit is reached in 4 months in Western Australia, although these are average values, and a month is rarely completely or not at all considered humid.
Humidex in °CHumidex in Western Australia
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Map of Western Australia

Most important cities in the federal state »Western Australia«

The federal state has a west-east extension of about 1520 km and over 2140 km from north to south.

CityPopulationGeo position
Mandurah83,29432° 31' 37"S115° 43' 18"E
Albany33,65035° 0' 11"S117° 51' 57"E
Kalgoorlie31,10730° 44' 46"S121° 28' 27"E
Kwinana30,43332° 13' 48"S115° 46' 53"E
Perth27,34031° 57' 8"S115° 51' 41"E
Geraldton26,87228° 46' 44"S114° 36' 53"E
Busselton21,89833° 39' 9"S115° 20' 44"E
Port Hedland15,04420° 18' 44"S118° 36' 38"E
Broome12,76617° 57' 19"S122° 14' 21"E
Karratha11,72820° 44' 16"S116° 50' 47"E
Maylands10,44731° 55' 60"S115° 52' 60"E
Joondalup8,42031° 44' 40"S115° 46' 6"E
Bentley8,32332° 0' 0"S115° 55' 0"E
Mosman Park8,25132° 0' 0"S115° 45' 0"E
Quinns Rocks7,99131° 40' 26"S115° 42' 13"E
Esperance7,88833° 51' 36"S121° 52' 57"E
Carnarvon7,39224° 52' 51"S113° 39' 34"E
Claremont7,15231° 58' 47"S115° 46' 56"E
Clarkson7,08231° 40' 58"S115° 43' 29"E
Cottesloe7,06532° 0' 0"S115° 46' 0"E
Heathridge6,88231° 45' 45"S115° 45' 32"E
East Fremantle6,69832° 2' 18"S115° 46' 3"E
Mindarie6,50731° 41' 22"S115° 42' 25"E
Collie6,33633° 21' 43"S116° 9' 22"E
Belmont6,10431° 56' 37"S115° 55' 32"E
Mullaloo5,86931° 46' 44"S115° 44' 12"E
Northam5,85531° 38' 58"S116° 40' 27"E
Kununurra5,67915° 46' 41"S128° 44' 39"E
Margaret River5,58433° 57' 13"S115° 4' 26"E
Boulder5,17830° 46' 55"S121° 29' 28"E

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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