Perth Temperature by Month
The average annual maximum temperature in Perth, Tayside, United Kingdom is 13°C (55°F), with daytime highs ranging from 7°C (45°F) in December to 20°C (68°F) in July. This page covers monthly averages, day-night differences, and how Perth compares to cities worldwide.
Perth Monthly Temperatures
In Perth, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 11°C (52°F) in July to 1°C (34°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Perth by month:
The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. July, the city's warmest month, gets 172 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Perth vs the United Kingdom
The map below shows the annual temperature across the United Kingdom. You can also select individual months if you want to compare a specific time of year.
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Perth vs World: Temperature Compared
Perth's average annual maximum temperature is 13°C (55°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Perth this rarely lasts long on the ground.
For more on Perth's weather — including monthly rainfall, sunshine hours, and humidity — visit our Perth climate page.
