May weather forecast
Perth, Australia

May marks the further continuation of cooler weather in Perth, where autumn transitions into the early phase of winter. The rainfall during this month amplifies to a significant 90mm (3.54"), marking the onset of wetter conditions in the city. It's a period when coats and jackets begin to surface in public. With the lowering temperatures, the days start getting shorter, gradually reducing daylight hours. Despite the occasional rain showers, the recurring sun-filled intervals enliven the city, making May a month of contrasts.

Temperature

A moderate decline in average high-temperatures is noted in Perth in May, moving from a moderately hot 25.9°C (78.6°F) in April to a pleasant 22.3°C (72.1°F). Perth throughout May, experiences an average nighttime temperature of 10.5°C (50.9°F).

Humidity

In May, the average relative humidity in Perth is 50%.

Rainfall

In May, the rain falls for 11.1 days. Throughout May, 90mm (3.54") of precipitation is accumulated. In Perth, Australia, during the entire year, the rain falls for 108.4 days and collects up to 725mm (28.54") of precipitation.

Sea temperature

In May, the average sea temperature is 22.3°C (72.1°F).
Note: Individual preferences to cold, influenced by conditions such as sunshine, wind, and surrounding temperature, play a part in the comfort of swimming in 22.3°C (72.1°F) waters. (As an aside, Olympic swimming standards dictate water temperatures from 25°C (77°F) to 28°C (82.4°F).)

Daylight

In May, the average length of the day in Perth is 10h and 30min.
On the first day of the month, sunrise is at 6:48 am and sunset at 5:38 pm. On the last day of May, in Perth, sunrise is at 7:08 am and sunset at 5:20 pm AWST.

Sunshine

In Perth, the average sunshine in May is 6.9h.

UV index

The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 4 during May translates into the following guidance:
Act with care - The need to guard against sun damage is communicated. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Take warning! Reflective sand and water surfaces intensify the Sun's UV rays.