Thornlie Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Thornlie.
Climate overview of Thornlie
Thornlie, Western Australia, Australia, experiences significant temperature variation throughout the year. Summers bring daytime highs of 32°C (90°F) in January, while winters cool to 18°C (64°F) in July.
Annual rainfall is moderate at around 586 mm (23 in), with July being the wettest month. The city also has a distinct dry season from October to April, with very warm summers and pleasant winters. The sunniest month is January, with 11.8 hours of sunshine per day on average.
Thornlie Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Thornlie - and find the best time to visit.
Monthly Temperature in Thornlie
Depending on the time of the year, temperatures range from very warm to pleasant in Thornlie. Average daytime temperatures reach a very warm 32°C (90°F) in January. In July, the coolest month of the year, temperatures drop to a pleasant 18°C (64°F).
At night, temperatures range from around 19°C (66°F) in January to 9°C (48°F) in July.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Thornlie
Generally, Thornlie has a moderate amount of precipitation, averaging 586 mm (23 in) of rainfall annually. Thornlie can be quite wet during July, receiving approximately 103 mm (4.1 in) of precipitation over 15 rainy days.
In contrast, during the driest month (December), you will experience much drier conditions, with 13 mm (0.5 in) of precipitation spread across 4 rainy days. For more details, please visit our Thornlie Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Thornlie
Thornlie can be enjoyed more throughout the sunniest month of January under a blue sky, with approximately 11.8 hours of sunshine daily. In contrast, the city experiences much darker days in June, with only 5.9 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Water Temperature in Thornlie
The mean water temperature over the year ranges from 17°C (63°F) in August to 21°C (70°F) in March.
Water temperature over the year
Humidity in Thornlie by Month
The relative humidity is moderate throughout the year in Thornlie.
The city experiences its highest humidity in July, reaching 57%. In February, the humidity drops to its lowest level at 38%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Thornlie
The average wind speed over the year ranges from 5 m/s (10 knots) to 7 m/s (14 knots). It is lower in May, June and July and higher in January, February, October, November and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Thornlie
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April, May, September, October and November
- Warmest weather: January and February
- Most sunshine: January and December
- Fewest rainy days: January, November and December
- Best for swimming: January, February, March, April and May.
- Wettest months: May, June, July, August and September, when rainfall is highest.
- Seasonal pattern: A distinct dry season from October to April, with very warm summers and pleasant winters
Frequently asked questions about the climate in Thornlie
What is the best time to visit Thornlie?
April, May, September, October and November typically offer the most optimal weather in Thornlie. In contrast, July tends to have less optimal conditions. Thornlie has a distinct dry season from October to April, with very warm summers and pleasant winters.
What temperatures can I expect in Thornlie?
Daytime highs range from 18°C (64°F) in July to 32°C (90°F) in January. Nighttime lows range from 9°C (48°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Thornlie get?
Annual rainfall is around 586 mm (23 in). July is the wettest month with 103 mm (4.1 in), while December is the driest with 13 mm (0.5 in).
How sunny is Thornlie?
Thornlie receives around 3,224 hours of sunshine per year. January is the sunniest month with 355 hours, while June is the cloudiest with just 178 hours. Overall, Thornlie enjoys abundant sunshine.
Thornlie 3-Day Forecast
Thornlie on the map
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