Short answer: Melbourne does not have a single rainy season in the way tropical northern Australia does. Rainfall is spread fairly evenly across the year, with around 48–55 mm per month according to the Bureau of Meteorology Melbourne (Olympic Park) climate averages. The wettest months by total rainfall are October and November (around 65 mm); the months with the most rain days are July and August (an average of 14–16 days with measurable rain).
This is the structural difference UK and overseas visitors most often misunderstand: Melbourne’s rainfall pattern is closer to London’s than to Sydney’s or Brisbane’s.
What the Bureau of Meteorology Data Actually Shows
According to long-term Bureau of Meteorology averages for Melbourne (the Olympic Park station, official since 2013):
- Annual rainfall: approximately 600–650 mm
- Wettest month by total: October-November (around 65 mm each)
- Driest month by total: January and February (around 47 mm each)
- Most rain days: July (around 16 days with measurable rain)
- Fewest rain days: February (around 8 days)
The “most rain days” and “wettest month by total” don’t match — that’s because spring and summer rainfall comes in shorter, heavier thunderstorm bursts, while winter rainfall is more often persistent drizzle.
Why This Matters for Trip Planning
For a UK visitor used to thinking of “rainy season” as a tropical concept (monsoon, dry season), Melbourne’s profile is different. The practical implications:
- No month is reliably dry. Even January and February will have at least 8 days of rain in an average year.
- Spring and summer rain comes in storms. A November afternoon thunderstorm dumps 20 mm in 40 minutes, then clears. Plan around it; don’t write off the day.
- Winter rain is drizzle and overcast. A July day might have 4 mm of rain spread across the whole afternoon — directly comparable to a London November day.
- The “four seasons in one day” cliché is largely accurate, particularly in spring (September-November). It’s worth checking the half-day forecast, not just the day forecast.
Spring (September-November): Storm Season
Spring is Melbourne’s most volatile rainfall pattern. Cold fronts from the Southern Ocean meet warm interior air, generating short, intense storms. The 2010 floods and the 2022 floods both fell in spring.
October and November together account for the wettest 60-day window of the year. If you’re visiting in this window, pack a compact rain jacket; outdoor events still happen but a 30-minute storm shutdown is not unusual.
Winter (June-August): Drizzle and Cloud
Winter rainfall is lower in total volume than spring but spread across more days. The pattern: overcast days, persistent light rain, occasional clearer windows. Average daily maximum temperatures of 13–15°C combined with light rain make the weather feel colder than the temperature alone suggests.
For UK visitors, July in Melbourne reads as a slightly milder, drier UK November. Bring a coat and an umbrella; you’ll use both.
Summer (December-February): Heat and Storms
Summer rainfall in Melbourne is bimodal — long dry stretches punctuated by intense thunderstorms. The “dry summer” reputation is real in terms of total rainy days (8 in February is the lowest of the year), but the storms when they come are heavier than at any other time.
Bushfire risk in regional Victoria is at its highest from late December to mid-February; smoke days in the city itself are most common in late January through February when there is a major fire to the north or east of Melbourne.
Autumn (March-May): The Best Weather Window
Autumn has the most stable, predictable rainfall in Melbourne. March and April average 50–55 mm spread across 10–12 rain days, with daytime maximums in the 19–24°C range. This is the season most consistently recommended for outdoor visitors.
What This Means for You
If you’re trying to pick the lowest-rain window for a Melbourne trip, late January through early March has the fewest rain days but the highest heat. March-April has slightly more rain but more comfortable temperatures and is the best-balanced window.
If you’re visiting in July-August (UK summer), expect 14–16 rain days but mostly drizzle rather than washouts; an umbrella and a waterproof jacket cover most of it.
For more on this, see Melbourne itinerary in winter and what is the best time of year to visit Melbourne. Bureau of Meteorology Melbourne (Olympic Park, station 086338) climate statistics are the source for all data quoted here.