Upper Swan Temperature by Month

Upper Swan, Western Australia, Australia has an average annual maximum temperature of 25°C (77°F), ranging from 18°C (64°F) in July to 33°C (91°F) in January. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

The climate in Upper Swan is dynamic, ranging widely from pleasant in winter to very warm in summer. Nights are significantly colder, with lows dropping from 18°C (64°F) in January to 9°C (48°F) in July.

The chart below illustrates the average maximum day and minimum night temperatures in Upper Swan by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. January, the warmest month, sees 355 hours of sunshine.

The chart below shows the average temperature throughout the year:

Upper Swan's average annual maximum temperature is 25°C (77°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

Osaka, Japan averages 22°C (72°F) annually, with hot humid summers, mild winters, and pleasant spring and autumn seasons.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Upper Swan, July is the coolest month, with average highs of 18°C (64°F) and humidity around 57%, considered moderate. In January, the warmest month, temperatures average 33°C (91°F) with 39% humidity, conditions that feel low. For a full picture, see our humidity page.

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.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

For more on Upper Swan's weather, including monthly rainfall, sunshine hours, and humidity, visit our Upper Swan climate page.