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The city's climate is notorious for its changeability, often referred to as "four seasons in a day". Its climate can be described generally as temperate, with warm summers and cool winters. During the summer of December to February, daytime temperatures average around 26°C, with mildly comfortable nights averaging around 15°C, and humidity is rarely an issue. Despite this, it's not out of the ordinary for the city to swelter through heatwaves with temperatures that can exceed 35°C and top out around 40°C; such sweltering days come with nighttime lows that don't go below 20°C. With approximately 600 mm of rainfall annually, Melbourne gets only half as much rain as Sydney. October is typically the wettest month. Days are long, with sunrise at 6AM and sunset at 8:45PM. Winter (June–August) is usually cool with a mix of clear, sunny weather and cold & damp conditions. Temperatures in winter can range from chilly overnight lows as low as 0°C to daytime highs as high as 19°C at times.…

Melbourne forum threads are unanimous that January weather here is genuinely volatile - the city's famous 'four seasons in one day' reputation is fully earned this month, with temperatures capable of swinging from the high 30s Celsius down to the high teens within 24 hours, sometimes triggered by a sudden wind change from the north to the south. One poster described a mid-40s afternoon dropping to the low teens within an hour once the change hit. The consistent packing advice: bring layers regardless of the forecast, including a light cardigan or jacket, since a hot, sunny morning can turn cold and stormy with startlingly little warning.

February is Melbourne's hottest month and its most volatile. Regulars give the local rule bluntly: it can be 40C at two in the afternoon and 26C at half past, and February holds both some of the city's hottest days on record, into the mid-40s, and some of its wettest, with more than 80mm in 24 hours. They are divided on the four-seasons-in-one-day slogan, some calling it more myth than reality, but agreed on the consequence, which is layers and a flexible plan. The geography is the explanation - a hot dry continent to the north and Antarctica as the nearest southern neighbour. The record: 26.7C days, 15.5C nights, 3.8 precipitation days carrying 25.2mm and a 21.2C sea.

March is autumn here, which Melbourne-forum regulars rate as one of the best seasons - with the standing warning that the weather is very changeable: hot one day, quite cool the next, and a big drop overnight. The advice even to visitors from hot climates is to pack light winter layers, not just summer clothes. March is also the month posters name as the most reliable for staying out of the rain. Moomba lands early in the month over the long weekend, with the parade on the Monday from about 11am and the Yarra parkland given over to stalls, food vans, kids' activities and live music. The record: 25.6C days, 14.8C nights, 5.9 precipitation days, 9.5 hours of sun, a 19.9C sea and AQI 33.

Melbourne forum threads describe July as one of the two coldest months of the year - the other being August - with daytime temperatures around 12-17C and nights dropping into single figures, though posters are specific that it rarely reaches 0C in the city and a frosty morning usually promises a sunny, still day rather than a grim one. Rain is framed as drizzle that passes reasonably quickly rather than all-day soakers, with the heavier rain of the year arriving in spring, not winter. The season's defining feature is the swing - still frost-calm mornings against blustery days when a front pushes up from the Southern Ocean - which is why the repeated packing advice is layers. Posters also supply the upside: winter Melbourne means thinner crowds and Australian Rules football in full swing, and several locals note that by northern-hemisphere standards this is a mild winter - cold here is relative to what you are used to.

Regulars back their reputation for wild swings with a specific example rather than a general claim: one October saw 16C, then 26C the very next day, then back down to 16C the day after that - three days, three different seasons in effect. Our row backs a mild average across that range, 21C over 10.3C nights, with 78mm of rain across 9.9 days and a real 21.7 kph wind. Regulars describe the realistic range across the month as anywhere from 14 to 35C, most likely landing in the low 20s, with layering the only sensible way to handle a day that can genuinely go either way. The sea sits at a cool 15.8C. The record: humidity 70 percent, 9.7 hours of sun and one of the cleanest air readings in this project, AQI 32.

Regulars are direct that late spring here means genuine swing rather than a single number: a warm afternoon can meet a cold front and drop ten degrees in half an hour, with cool mornings, mild-to-warm afternoons and a cooling evening all inside the same day. Our row backs the range, 22.9C over 12.3C nights, with 68.4mm of rain across 9.1 days and a real 20.8 kph wind - regulars describe the rain itself as more heavy passing showers than steady drizzle. The standard packing list follows directly from the swing: shorts and a t-shirt for the warm stretch, a long-sleeved layer and a cardigan or light jacket for the cooler hours either side. The sea holds 18.2C. The record: humidity 69 percent, 10.4 hours of sun and AQI 32.

Locals will tell you the four-seasons-in-a-day line is more legend than forecast - by their own count it happens two or three days a year - but they will also tell you December is genuinely changeable, running mid-twenties to low thirties with the odd heatwave near forty and cool stormy spells that often follow one. Our row averages that at 25.6C over 14C with 55.4mm across 7.2 days. The night is the part people underpack for: fourteen degrees, feeling thirteen in a 21.2 kph wind, after an afternoon in the high twenties. The bay reaches 19.8C. The record: humidity 66 percent, 11.4 hours of sun inside 14.7 of daylight, and AQI 30.