Adelaide weather in August
August in Adelaide: cool, a little rain, with clean air — a great time to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#10 of 12 months in Adelaide · #704 of 1413 destinations to visit in August · comfort 79/100 (tier B)
- Days
- 17°C
- Nights
- 9°C
- Wet days
- 11
- Sun
- 8.7 h
- Humidity
- 75%
- Daylight
- 11 h

Traveller notes on Adelaide in August
Notes from nearby Kangaroo Island (118 km away)
Adelaide doesn't have its own notes for August yet — these are about Kangaroo Island, close enough to share the season.
Forum posters describe August as cold, windy and often rainy, with daytime temperatures commonly cited around 10-15C and a noticeable drop by late afternoon - a proper windproof jacket layered over a warm jumper, plus a beanie and gloves, is standard advice. Posters do note sunny morning stretches remain possible even within an otherwise unsettled week, and that quick, strong weather fronts are typical this time of year, with forecasts only considered reliable a few days out. The clear upside posters highlight: winter brings lush green countryside, flowing rivers and genuinely excellent wildlife viewing, with land mammals more likely to be seen out and about during the day rather than confined to dawn, dusk and night - and no mosquitoes to contend with.
Other months in Adelaide
Regulars describe genuinely wide year-to-year swings around the holidays here - some Christmas Days landing in full heatwave conditions near 40C, others turning cool with rain and wind instead - with no way to know in advance which version a given trip will get. Our row backs the warm, still-comfortable average sitting well below either extreme, 27.7C over 15.3C nights feeling 13C, with rain light at 20.4mm across just 3.1 days. Regulars traveling with elderly relatives or young kids specifically recommend building in air-conditioned downtime, the Adelaide Hills a popular escape when a heatwave does hit, and keeping the day's plans flexible enough to swap outdoor time for indoor if needed. The sea sits at a swimmable 20.3C. The record: humidity 56 percent, 12.3 hours of sun, a 24.8 kph wind and one of the cleanest air readings in this project, AQI 26.
October here is lovely and unreliable in the same breath - regulars tell visitors to bring jumpers and light coats as well as summer clothes, because winter can hang on into the month. Our row gives 22.5C reading as 21C over 11.8C nights that feel like 8C, and the reason is the wind: 24.8 kph, because spring here is windier than autumn. Rain has eased to 35.8mm across 6.4 days. The vineyards an hour out - the Barossa to the east, McLaren Vale to the south - are green and leafy after the winter rain and quiet in their own calendar. The sea is 17.2C, which is looking rather than swimming. The record: humidity 65 percent, 10.7 hours of sun and AQI 27.
April here is defined by what has just ended. March is the festival month - Fringe, the Adelaide Festival, WOMADelaide and a motor race, all at once - and April is the city afterwards: the summer heat gone, the cold not arrived, cool nights under crisp clear skies. Regulars warn the changeover is untidy, with summer sometimes running into April and occasional cool days early, and they put the month at mid-twenties by day and 12 to 14C at night against February's forties. Our row reads 23.4C over 13.1C with only 27.1mm across 4.4 days. The record: humidity 64 percent, 9.2 hours of sun, a 18.9C sea and AQI 22, the cleanest air in this collection.
November in Adelaide is warm without being hot - regulars give a mean maximum near 25C and a minimum near 14C, which our row matches at 24.7C and 13.5C - under mostly sunny skies, with about four rainy days in the month and not much in them. The Mediterranean climate is the reason they give for it rarely feeling humid or muggy; they quote roughly 40 percent humidity, where our row's 61.5 percent is a whole-day mean that includes the nights, so read theirs as the afternoon figure. The local name for the month is blow-vember, because the afternoon sea breeze comes in hard, and our row's 24.8 kph is that breeze. Occasional heatwaves aside, this is the comfortable end of an Australian spring. The record: 6.2 precipitation days carrying 40.6mm, 11.7 hours of sun and a 19C sea.
Add your own note from Adelaide's card on the map.
Adelaide climate normals — August
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Adelaide in August
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Quietschool holidays in 2 of the markets that fill it, one of its worst months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Adelaide's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherAdelaide's best weather comes in April, October and November — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Adelaide in August
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Southern right whales
1 Jun – 15 Oct · usuallyWhale seasonSouthern rights calve in Encounter Bay off Victor Harbor, an hour south. The headland at the Bluff and the whale centre do the job from land, without a boat. Source ↗
Nearby, and something's on
Within 300 km of Adelaide — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Adelaide?
Adelaide in August — FAQ
- Is August a good time to visit Adelaide?
- August in Adelaide: cool, a little rain, with clean air — a great time to visit. It ranks #10 of 12 months for Adelaide on SeasonMap's comfort score (79/100).
- What is the weather like in Adelaide in August?
- In August, Adelaide averages a daily high of 16.6°C and a low of 8.9°C, with about 55.8 mm of rain over roughly 10.7 rainy days.
- What is the air quality in Adelaide in August?
- Adelaide has a mean US Air Quality Index of about 24 in August.
Within 300 km: Kangaroo Island's Southern right whales around 15 May – 30 Sep.