Météo à Perth en septembre

The wildflowers are the reason to come and regulars give a rule of thumb that turns a season into a route: August for the country north of Perth, September for the south, so the month decides the direction you drive. In the city itself the Kings Park festival is at its height now. On weather they are careful - spring here can be cold, wet and windy as well as sunny, with low to mid twenties by day and cool nights - and our row reads 21.4C over 9.6C with a 24.5 kph wind and 58mm across 9.3 days. Layers, as ever. The record: humidity 72 percent, 10.4 hours of sun, a 18.2C sea and AQI 34.

Regulars call this genuinely one of the best times of year here specifically because the wind that defines other seasons largely dies down, leaving beautiful, still days even as the calendar edges toward winter. Our row backs the mild, still-pleasant read, 22.7C over 10.6C nights feeling 8C, with 73.7mm of rain across 8.6 days and a real 22.6 kph wind that regulars are clear is a fraction of what other months bring. Regulars describe real day-to-day swings too - warm enough for a t-shirt one day, cool enough for a hoodie the next - and a wetsuit as the standard answer for anyone still wanting a swim or snorkel this late in the season. The sea sits at 19C. The record: humidity 67 percent, 8.8 hours of sun and one of the cleanest air readings in this project, AQI 25.

December here is hot and dry - high twenties to mid thirties, low humidity - and the thing locals actually plan around has a name. The Fremantle Doctor is the afternoon sea breeze that arrives off the Indian Ocean and takes the edge off before evening; our wind column reads 29.5 kph as a monthly average, which is that breeze counted rather than a storm. Our row gives 30.4C at just 50 percent humidity, so it reads as 30C rather than worse, over 16.9C nights that feel cooler still. Rain is almost absent at 7.4mm, and there are 13.1 hours of sun. The sea is 23C. The odd cool day, even at Christmas, is part of the deal. The record: AQI 27.

Perth-forum threads on November split the month in two: early November can still feel like late spring, with only occasional days warm enough for the beach, while the back half heats up noticeably as summer approaches. The Fremantle Doctor - the afternoon sea breeze that cools the city down - is already in play, and posters recommend a jacket for evenings even on a warm day, though it isn't yet at its strongest; that peak comes in December and January when the land-sea temperature gap is largest. Near the coast the wind itself can run genuinely strong, 28 to 37 km/h. The record: 27C days feeling like 26C, 14.5C nights, 25mm total across 3.5 days, 12.4 hours of sun, a 21.5C sea and wind averaging nearly 28 km/h - warming up, breezy, not yet peak Doctor season.

Perth forum threads describe January as hot and dry, with posters citing typical days in the low-to-mid 30s Celsius and nights cooling into the low 20s. The heat was consistently called a dry heat rather than the oppressive humid kind, and posters pointed to the 'Fremantle Doctor' - a reliable afternoon sea breeze off the coast - as genuinely cooling the city down each day, with mornings and evenings described as pleasant enough for a European-style midday siesta in between. Staying closer to the coast rather than inland was the standard advice, since posters noted the cooling effect of that sea breeze fades noticeably once you're 10-15km inland. Perth was also repeatedly recommended over Australia's east coast for this time of year specifically because it avoids cyclone risk entirely.