Adelaide weather this week: cool, cloudy start gives way to a spring heat pulse and a warm weekend

Bassyonni

ago 4 hours

Adelaide weather

Adelaide begins the week under mostly cloudy skies and crisp mornings, but a midweek wind shift will usher in a classic late-October warm-up. After a pair of near-20°C afternoons, temperatures leap toward the high 20s on Thursday and could touch 30°C or higher by Saturday before easing slightly Sunday. Plan on layers now, sunscreen and extra water later.

The headline: spring mood swings, then a burst of heat

A cool southerly influence keeps Monday and Tuesday mild—think light jacket mornings and comfortable afternoons. By Wednesday, haze and high cloud arrive as warmer air noses in from the interior. The warmest stretch targets Thursday through Saturday, with Thursday around 28°C and Saturday near 30°C in the metro (hotter inland). Humidity stays modest, so the warmth will feel dry and summery rather than muggy.

Day-by-day outlook (Adelaide metro)

Monday, Oct 27: Mostly cloudy, 19°C / 7°C. Light onshore breeze, cool evening.
Tuesday: Mostly sunny, 20°C / 8°C. Pleasant in the sun, chilly after dark.
Wednesday: Hazy sunshine, 22°C / 10°C. Subtle warm-up, light northerlies.
Thursday: Much warmer; sun giving way to high cloud, 28°C / 14°C. First real taste of late-spring heat.
Friday: Hazy sun, 23°C / 9°C. A brief step back toward seasonal.
Saturday: Warm to hot with sunny breaks, 30°C / 20°C. Inland suburbs likely hotter.
Sunday: Cloudier and not as warm, 27°C / 14°C. Still a solid day outdoors.

(Forecast highs/lows in °C; suburbs may vary by a couple of degrees.)

Why it’s happening

A weak high in the Bight and lingering onshore flow keep Adelaide cool to start. Midweek, a broad trough inland draws northerly winds, transporting warmer, drier air from the interior toward the coast. That set-up typically bumps temperatures sharply for a day or two before the next change nudges them back toward average.

Impacts & planning tips

Morning chill vs. afternoon comfort (Mon–Tue):

Expect single-digit lows in outer suburbs; cover tender plants and set the coffee timer.
Light layers are enough by lunchtime under brighter skies.

Heat management (Thu–Sat):

Shift runs, rides and yard work to morning hours; the sun angle is already summer-like.
Hydrate and reapply sunscreen—UV levels spike quickly on warm, dry days.
If you work outdoors, plan extra breaks and shade, especially Friday afternoon if winds freshen.

Fire-weather awareness:

Warm, dry northerlies later in the week can elevate fire danger, especially north and east of the city. Have your plan and stay tuned to official advisories if you live near grass or scrub.

Air & haze:

The “hazy sun” midweek flags reduced visibility aloft—usually harmless but noticeable on the hills skyline. Sensitive groups may prefer morning walks when air is coolest and clearest.

Coastal & Hills notes

Coast: Sea breezes stay weak early week; by Thursday, warm northerlies delay the sea breeze, so beaches may feel hotter than usual until mid-afternoon.
Hills & valleys: Expect bigger overnight drops in sheltered spots Monday–Tuesday, then faster warm-ups later in the week. Saturday could run a couple of degrees cooler atop the ranges if cloud builds.

Weekend snapshot

Saturday is the marquee day for outdoor plans—warm to hot with mostly sunny breaks and a light to moderate northerly. Sunday trends a touch cooler with more cloud but remains comfortable for markets, sport and gardening.

Early week: Cool starts, gentle afternoons—ideal for commuting and errands.
Late week: A spring heat pulse arrives; Thursday through Saturday skew warm to hot, dry and bright.
Weekend: Warm, turning a bit less hot Sunday with more cloud.

Keep the jacket handy for mornings now, then swap to hat, sunnies and water bottle as Adelaide flips the switch to late-spring warmth.