Melbourne is 4.6°C (8.3°F) warmer by day, Melbourne has 5.2°C (9.4°F) warmer nights, Seattle gets 503 mm (19.8 in) more rain a year.
Melbourne is at its warmest in January and coolest in July, while Seattle peaks in July and bottoms out in December. Month for month, Melbourne is the warmer of the two in 7 of 12 months.
Seattle is the wetter of the two, collecting 1,255 mm (49.4 in) of rain a year against 752 mm (29.6 in) in Melbourne. The most comfortable time to visit is March, November and December in Melbourne and June, July and August in Seattle.
| Melbourne | Metric | Seattle |
|---|---|---|
| 🌡️ Temperature | ||
| 26.1°C | 🌡️Average daytime high | 21.5°C |
| 7.2°C | 🌙Average nighttime low | 2°C |
| January | 🔥Hottest month | July |
| July | ❄️Coldest month | December |
| 🌧️ Rain | ||
| 752 mm | 🌧️Annual rainfall | 1,255 mm |
| October | ☔Wettest month | November |
| February | 🏜️Driest month | July |
| 💨 Climate | ||
| 75% | 💧Average humidity | 83% |
| 3.3 m/s | 💨Average wind speed | 0.7 m/s |
Overnight, Melbourne typically falls to around 7.2°C (45°F) while Seattle settles near 2°C (35.6°F).
Melbourne is hottest in January and coldest in July, whereas Seattle peaks in July and is coolest in December.
Melbourne sees the most rain in October and the least in February; Seattle is wettest in November and driest in July.
Seattle feels the more humid of the two, averaging 83% relative humidity against 75%.
For Seattle, the pick of the year is June, July and August.
Month by month, here is the coldest night, the average day and the hottest afternoon each city can expect. Switch Compare to read rainfall, humidity, wind or solar instead, and Period to move between the long-term 45-year average and any single year — the shading is a quick warm-to-cool guide.
| Month | Melbourne | Seattle | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | 11.2 | 23.8🔥 | 36.5 | -4.3 | 3.9 | 12.1 |
| February | 11.5 | 23.4 | 35.3 | -4 | 4.8 | 13.6 |
| March | 10.6 | 21.5 | 32.5 | -1.2 | 8 | 17.2 |
| April | 8.3 | 17.6 | 27 | 1 | 11.5 | 22.1 |
| May | 5.9 | 13.7 | 21.6 | 3.7 | 14.8 | 26 |
| June | 3.8 | 10.3 | 16.9 | 6.7 | 17.5 | 28.3 |
| July | 3 | 9.3❄️ | 15.6 | 9.5 | 19.9 | 30.3 |
| August | 3.6 | 10.5 | 17.4 | 9.8 | 20🔥 | 30.2 |
| September | 4.6 | 12.8 | 21 | 6.9 | 17.5 | 28.1 |
| October | 6 | 15.9 | 25.7 | 2 | 12.3 | 22.5 |
| November | 7.7 | 19 | 30.3 | -2 | 6.8 | 15.5 |
| December | 9.6 | 21.6 | 33.6 | -4.5 | 3.7❄️ | 12 |
| Annual Avg | 7.2 | 16.6 | 26.1 | 2 | 11.7 | 21.5 |
Min / mean / max temperature (°C). 🔥 marks each city's hottest month, ❄️ its coldest; shading runs cool blue to warm red.
The same figures plotted out, so the shape of a typical year is easier to see than in a grid. Where the two lines run close together Melbourne and Seattle feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Melbourne Seattle
See how Melbourne and Seattle stack up against other cities. Swipe for more.
Choose which city to keep, then search for any other city in our database — we'll build the comparison for you.
Quick answers to the questions people ask most when comparing Melbourne and Seattle — each drawn straight from the climate figures above.
Melbourne is the warmer of the two. It averages daytime highs of 26.1°C (79°F) against 21.5°C (70.7°F) in Seattle — roughly 4.6°C (8.3°F) warmer by day. Nights are milder in Melbourne, with average lows of 7.2°C (45°F) versus 2°C (35.6°F).
Melbourne is hottest in January, averaging highs of about 36.5°C (97.6°F), while Seattle peaks in July at around 30.3°C (86.5°F). That makes Melbourne the hotter of the two at the height of summer.
Seattle gets colder. In its coldest month (December) overnight lows average about -4.5°C (23.8°F), compared with 3°C (37.3°F) at the low point of the year in Melbourne.
Seattle is the wetter city, collecting about 1,255 mm (49.4 in) of rain a year versus 752 mm (29.6 in) in Melbourne. Melbourne is wettest in October and driest in February; Seattle is wettest in November and driest in July.
Seattle is the more humid of the two, averaging 83% relative humidity over the year against 75% in Melbourne.
The most comfortable months in Melbourne are March, November and December, when average temperatures are at their mildest.
Seattle is at its most pleasant around June, July and August, based on the mildest average temperatures of the year.
Melbourne is the warmer city in 7 of the 12 months of the year. The gap is widest in January, about 19.9°C (35.8°F), and narrowest in May, about 1.1°C (2°F).
Seattle has the bigger seasonal swing, about 16.3°C (29.3°F) between its coldest and hottest months versus 14.5°C (26.1°F) in Melbourne — so Melbourne has the steadier, more even climate.
On climate alone, Melbourne comes out ahead — it offers warmer days, less rain and lower humidity than Seattle. Seattle is the better fit only if you'd actually prefer cooler weather, more rainfall and a more humid climate.
Every figure on this page is calculated from NASA POWER satellite climate data spanning 1981–2025 (45 years). The averages describe the long-term climate of Melbourne and Seattle, not a single year's weather or a short-range forecast.
