Weather in Perth in June

A good month. June is a solid month to be in Perth. Highs average 18.9 °C, lows 14.5 °C, and rain falls on 12 days — nothing in the month is working against you.

June ranks 10 of 12 — near the bottom of Perth's year. January is the month that works, and the swing between the two is 34 points, which is a different holiday rather than a slightly better one. Worth keeping in perspective: June is the weakest month of Perth's year and it is still a perfectly good one. The downside here is small.

Rain on 12 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average June reaches 30 °C; the day barely swings — 4.4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest June day reached 23.6 °C and the coldest night fell to 9.4 °C, and the wettest single day dropped 42 mm — roughly 37% of the month's rain in one day.

June is moderately variable: 30 mm in the driest year against 284 mm in the wettest, around an average of 113 mm. Roughly two Junes in three land near that average, and the third does something else entirely.

Wind sits around 18.5 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity is unremarkable at 71%.

How June sits in the year

Temperatures hold steady either side: 20.9 °C in May, 18.9 here, 17.6 in July. Nothing about the timing within the month matters much.

Daylight in June

June sits at the dark end of Perth's year — 10.1 hours of daylight against 14.2 at midsummer, holding steady all month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

Sea temperature

The sea sits at about 21.4 °C in June — comfortable for a proper swim. The sea peaks at 22.9 °C in March and bottoms out at 19 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

June in Perth versus nearby

If Perth is one option among several, the nearby comparison is worth making. Bunbury is close enough to be a coin toss — within a degree on temperature, 3 days more rain. Geraldton is a better bet in June — within a degree on temperature, 3 days less rain.

So: June is a compromise. January is 25 points better and is what Perth is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Perth

See all twelve months in Perth, or where else to go in June.