Sydney Weather by Month 2026: Climate, Temperatures & Rainfall Guide
Sydney weather by month 2026: average temperatures, rainfall, sea temps and what to pack for every month from January to December.
Sydney weather by month is one of the most-searched topics by travellers planning a trip to Australia’s biggest city — and for good reason. The Australian seasons are inverted from the Northern Hemisphere, the climate is warmer and more humid than many visitors expect, and the difference between January summer and July winter is significant enough to dictate completely different packing lists. This 2026 month-by-month Sydney weather guide gives you average highs and lows, sea temperatures, rainfall, what to expect day-to-day, and what to pack for every month of the year — backed by Bureau of Meteorology data.
Sydney climate overview
Sydney has a humid subtropical climate (Köppen classification Cfa) — warm to hot summers, mild to cool winters, generally moderate rainfall year-round with no defined dry season. The long-term averages at Sydney Observatory Hill (1859–2020) are a 21.8°C daily maximum and a 13.8°C minimum, with about 1,213mm of rain a year falling on roughly 100 days with at least 1mm. The monthly figures below come from the same station. The Pacific Ocean and the Tasman Sea keep coastal Sydney noticeably milder than inland NSW. Heatwaves and southerly buster cold fronts can produce 15°C swings in 24 hours.
The crucial detail for trip planners is that Sydney weather by month follows the Southern Hemisphere calendar: summer is December–February, autumn March–May, winter June–August and spring September–November. The “good weather” months for most international visitors are October, November, March and April — warm but not extreme, low humidity, low rain risk.
Sydney weather by month: January
January is the hottest month, with average highs of 26°C and lows of 19°C. Heatwaves can push the mercury above 35°C, particularly when westerly winds from the desert interior push high-thirties heat across the city. Sea temperature: 22–24°C — peak summer swimming. Rainfall: around 100mm, often in heavy thunderstorms. Relative humidity averages 71% at 9am and 62% at 3pm, making 28°C feel hotter than it sounds.
School holidays mean tourist crowds peak; expect busy beaches, full hotels and elevated airfares. Sydney Festival runs all month. Bring: lightweight clothing, swimwear, sunscreen SPF50+, sun hat, and one light layer for air-conditioned restaurants.
Sydney weather by month: February
February remains hot and humid with average highs of 26°C and lows of 19°C. Rain averages about 120mm, which is a lot, though June is wetter still. Thunderstorms are common late-afternoon. The sea is at its warmest, averaging about 24°C.
Pack the same as January, plus a compact umbrella or light rain shell for sudden storms.
Sydney weather by month: March
March is one of Sydney’s best months. Average highs 25°C, lows 18°C. Humidity drops noticeably, the worst summer heat tapers off, and sea temperature remains a warm 23°C. Rainfall around 130mm. School is in session, so weekday crowds are lower than January–February. The Sydney Royal Easter Show typically runs late March/early April.
Pack: light layers, swimwear (sea swimming still excellent), light rain jacket.
Sydney weather by month: April
April delivers a continuation of the autumnal sweet spot — average highs 23°C, lows 15°C, sea temperature 23°C, rainfall around 127mm. Days are noticeably shorter (sunset around 5:20pm by month’s end). Excellent walking weather; the Bondi to Coogee coastal walk and Royal National Park hikes are at their best.
Pack: jumper or light jacket for evenings, comfortable walking shoes, swimwear if hardy.
Sydney weather by month: May
May is mid-autumn with average highs of 20°C, lows of 12°C and sea temperatures cooling to about 21°C. Rainfall 117mm. Vivid Sydney light festival typically begins in late May, transforming the CBD with light projections.
Pack: jumper, light jacket, scarf for evenings. Beach swimming uncomfortable without a wetsuit; ocean pool swimming still doable for the hardy.
Sydney weather by month: June
June is the start of winter. Average highs 17°C, lows 9°C. Sea temperature about 19°C. Rainfall around 133mm — June is Sydney’s wettest month on average. Vivid Sydney typically runs through mid-June. Whale-watching season starts in earnest along the coast.
Pack: warm jacket, jumper, long pants, layered clothing, water-resistant shoes.
Sydney weather by month: July
July is the coldest month — average highs 16°C, lows 8°C. Sea temperature about 19°C, and the water keeps cooling into September. Rainfall 96mm. Frost is rare in coastal Sydney but possible in the western suburbs and Blue Mountains. NSW public school winter holidays in 2027 run from Monday 5 to Friday 16 July.
Pack: insulated winter jacket (not heavy down — Sydney is mild), jumper, scarf, beanie for early mornings.
Sydney weather by month: August
August often surprises visitors — average highs reach 18°C, lows 9°C. Sea temperature about 19°C. Rainfall drops to 80mm — one of the drier months. Late August feels like early spring; the next City2Surf, the 14km charity run from the CBD to Bondi Beach and one of the world’s largest road races, is on Sunday 8 August 2027.
Pack: warm jacket and jumper still essential, but lighter layers for daytime.
Sydney weather by month: September
September is the start of spring and beach-friendly weather creeps back. Average highs 20°C, lows 11°C. Sea temperature about 18.5°C, the coolest of the year. Rainfall 70mm — September is statistically Sydney’s driest month. Wildflowers begin blooming in the Royal National Park, and Sydney Spring Carnival horseracing fills the calendar.
Pack: light jumper, light jacket, comfortable walking shoes — daytime layered clothing.
Sydney weather by month: October
October is many travellers’ favourite month for visiting Sydney. Average highs 22°C, lows 14°C. Sea temperature about 19°C, which can still feel cool for a swim. Rainfall 77mm. Jacaranda trees begin blooming purple across the city; the Bondi to Coogee coastal walk is at its best. Sculpture by the Sea, the free outdoor art exhibition on the Bondi to Tamarama coastal walk, runs from mid-October into early November (16 October to 2 November in 2026).
Pack: light layers, light jumper for evenings, comfortable walking shoes, swimwear.
Sydney weather by month: November
November is glorious — average highs 24°C, lows 16°C. Sea temperature about 21°C, though how warm that feels depends on the swimmer. Rainfall 85mm. Days are long (sunset around 7:30pm), nights mild. The jacaranda canopy peaks in Kirribilli and through the Royal Botanic Garden.
Pack: light summer clothing, swimwear, sun hat, sunscreen SPF50+.
Sydney weather by month: December
December brings the start of summer. Average highs 25°C, lows 18°C. Sea temperature about 22°C. Rainfall 77mm. NSW public school summer holidays begin on Friday 18 December 2026. New Year’s Eve fireworks over the Harbour draw more than a million spectators to the foreshore.
Pack: summer clothing, swimwear, light layer for evenings, sun protection.
Quick-reference table: Sydney weather by month
For a single-glance reference, here are the key Sydney weather by month figures rounded to whole numbers:
- January: 26°C / 19°C, sea 23°C, rainfall 100mm
- February: 26°C / 19°C, sea 24°C, rainfall 120mm
- March: 25°C / 18°C, sea 23°C, rainfall 130mm
- April: 23°C / 15°C, sea 23°C, rainfall 127mm
- May: 20°C / 12°C, sea 21°C, rainfall 117mm
- June: 17°C / 9°C, sea 19°C, rainfall 133mm
- July: 16°C / 8°C, sea 19°C, rainfall 96mm
- August: 18°C / 9°C, sea 19°C, rainfall 80mm
- September: 20°C / 11°C, sea 18.5°C, rainfall 70mm
- October: 22°C / 14°C, sea 19°C, rainfall 77mm
- November: 24°C / 16°C, sea 21°C, rainfall 85mm
- December: 25°C / 18°C, sea 22°C, rainfall 77mm
Best month to visit Sydney
If you can choose your visit date, March/April and October/November deliver the best balance of warm-but-not-hot temperatures, swimmable water, lower rainfall, and smaller crowds than the summer school holiday period. For beach-focused trips, late October through late February is best. For cultural and walking-focused trips, March, April, October and November are ideal. For Vivid Sydney light festival, May–June. For whale watching, May–October.
Worst month to visit Sydney
June has Sydney’s highest average rainfall, about 133mm, and July is the coldest month, with average highs around 16°C and lows around 8°C. That said, “worst” is relative — Sydney has fewer truly bad weather months than most major world cities. Even winter sees frequent sunny days.
Sydney weather extremes to know
Sydney is increasingly seeing weather extremes. Summer heatwaves can push temperatures well past 35°C. The “southerly buster” — a violent cold front that can drop temperatures 15°C in an hour — typically arrives late on hot summer days. Bushfire smoke can affect air quality in the warmer months. Heavy thunderstorms with hail are common in summer; flash flooding can briefly disrupt the CBD.
Sydney UV and sunburn warning
Australia’s UV levels are high, driven by its latitude, the height of the sun, Earth’s orbit and atmospheric conditions. UV levels vary with the season, the time of day and cloud cover, so check the daily UV forecast. UV can damage skin even on cool or cloudy days. SPF 50+ sunscreen, sunglasses and a wide-brimmed hat are essential year-round but critical in summer. The Cancer Council Australia’s “Slip Slop Slap” campaign is taken seriously by locals.
Sydney sea temperature month by month
Sydney’s ocean swimming season runs roughly November through May. Below 18°C most non-locals find swimming uncomfortable; 20°C+ is when the beach culture is at full tilt. The sea is warmest in February, averaging about 24°C, and coolest in September, at about 18.5°C. Ocean pools (Bondi Icebergs, Bronte Baths, Wylie’s Baths) are slightly warmer than open ocean because of solar heating.
Rain in Sydney: what to expect
Rain is possible in any month. June is wettest (about 133mm) and September driest (about 68mm). Pack a compact umbrella or light rain shell year-round.
Frequently asked questions about Sydney weather by month
What is the best month to visit Sydney?
October, November, March and April offer the best balance of warm weather, swimmable water, low rainfall and manageable crowds. October is often cited as the single best month.
When is Sydney’s rainy season?
Sydney has no defined rainy season but June is the wettest month on average, followed by March and April. September is statistically the driest.
How hot does Sydney get in summer?
Average summer highs are 25–26°C in December–February, but heatwaves can push 35°C+ and Sydney Observatory Hill’s record is 45.8°C, set on 18 January 2013. Humidity makes 28°C feel hotter.
How cold does Sydney get in winter?
Average July highs are 16°C with lows of 8°C. Frost is rare in the city; the Blue Mountains can drop below 0°C. Snow can fall in the Blue Mountains in winter. In central Sydney it is extremely rare, though snow did cover the city’s streets on 28 June 1836.
Can you swim in Sydney in winter?
Hardy locals swim year-round in ocean pools (Bondi Icebergs, Bronte) but most tourists find June–September too cold without a wetsuit. Sea temperatures average about 19°C in July and August and bottom out at about 18.5°C in September.
What is the average rainfall in Sydney?
Around 1,200mm per year at Sydney Observatory Hill, spread over about 100 days with at least 1mm of rain, peaking in June (133mm) and lowest in September (68mm).
Final word on Sydney weather by month
Whatever month you visit, Sydney weather is rarely a deal-breaker — even winter has dependably sunny days, and the city’s coastal setting moderates extremes. The most important takeaways: pack for layered dressing, bring SPF50+ sunscreen no matter the season, and plan beach-focused trips for November through April. The right month transforms Sydney from “good destination” to “world’s-best city break”.
Helpful resources for planning your Sydney trip
For the very latest information on opening hours, ticketing and transport, the following official resources are kept up to date:
- Bureau of Meteorology Sydney
- Climate Sydney averages
- Sydney sea temperature
- BOM rainfall climate
- Tourism Australia weather
- Time and Date Sydney
Heading inland? The upper Blue Mountains sit about a kilometre above sea level and follow a colder, wetter pattern than the coast, with frosts in winter and storms and fire risk in summer. See our separate guide to Blue Mountains weather before you pack.
Related Sydney guides
Keep planning with our seasonal and trip-planning guides: