Perth is 6.7°C (12.1°F) warmer by day, Perth has 13°C (23.4°F) warmer nights, Cologne gets 127 mm (5 in) more rain a year.
Cologne is at its warmest in August and coolest in January, while Perth peaks in January and bottoms out in August. Month for month, Perth is the warmer of the two in 9 of 12 months.
Cologne is the wetter of the two, collecting 822 mm (32.4 in) of rain a year against 695 mm (27.4 in) in Perth. The most comfortable time to visit is June, July and August in Cologne and April, May and November in Perth.
| Cologne | Metric | Perth |
|---|---|---|
| 🌡️ Temperature | ||
| 21.1°C | 🌡️Average daytime high | 27.8°C |
| 0°C | 🌙Average nighttime low | 13°C |
| August | 🔥Hottest month | January |
| January | ❄️Coldest month | August |
| 🌧️ Rain | ||
| 822 mm | 🌧️Annual rainfall | 695 mm |
| December | ☔Wettest month | July |
| April | 🏜️Driest month | December |
| 💨 Climate | ||
| 82% | 💧Average humidity | 69% |
| 3 m/s | 💨Average wind speed | 5.2 m/s |
Overnight, Cologne typically falls to around 0°C (32°F) while Perth settles near 13°C (55.4°F).
Cologne is hottest in August and coldest in January, whereas Perth peaks in January and is coolest in August.
Cologne sees the most rain in December and the least in April; Perth is wettest in July and driest in December.
Cologne feels the more humid of the two, averaging 82% relative humidity against 69%.
For Perth, the pick of the year is April, May and November.
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 | Cologne | Perth | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | -8.2 | 1.1❄️ | 10.5 | 15.9 | 25.3 | 34.7 |
| February | -7.4 | 2.2 | 11.9 | 16.3 | 25.4🔥 | 34.5 |
| March | -4 | 6.5 | 16.9 | 15.6 | 24.4 | 33.2 |
| April | -2.2 | 9.6 | 21.4 | 14.3 | 21.7 | 29.1 |
| May | 2.1 | 13.7 | 25.2 | 12.9 | 19 | 25.1 |
| June | 6.1 | 17.7 | 29.2 | 11.2 | 16.6 | 22.1 |
| July | 8.9 | 20.2🔥 | 31.6 | 10.4 | 15.5❄️ | 20.6 |
| August | 8.6 | 20.1 | 31.7 | 10 | 15.5 | 20.9 |
| September | 5.4 | 16.2 | 27 | 10.4 | 16.7 | 23 |
| October | 0.6 | 11.2 | 21.7 | 11.3 | 19 | 26.8 |
| November | -3.2 | 6.1 | 15.3 | 12.9 | 21.7 | 30.5 |
| December | -6.8 | 2.2 | 11.2 | 14.6 | 24 | 33.4 |
| Annual Avg | 0 | 10.6 | 21.1 | 13 | 20.4 | 27.8 |
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 Cologne and Perth feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Cologne Perth
See how Cologne and Perth 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 Cologne and Perth — each drawn straight from the climate figures above.
Perth is the warmer of the two. It averages daytime highs of 27.8°C (82°F) against 21.1°C (70°F) in Cologne — roughly 6.7°C (12.1°F) warmer by day. Nights are milder in Perth, with average lows of 13°C (55.4°F) versus 0°C (32°F).
Cologne is hottest in August, averaging highs of about 31.7°C (89°F), while Perth peaks in January at around 34.7°C (94.5°F). That makes Perth the hotter of the two at the height of summer.
Cologne gets colder. In its coldest month (January) overnight lows average about -8.2°C (17.2°F), compared with 10°C (50°F) at the low point of the year in Perth.
Cologne is the wetter city, collecting about 822 mm (32.4 in) of rain a year versus 695 mm (27.4 in) in Perth. Cologne is wettest in December and driest in April; Perth is wettest in July and driest in December.
Cologne is the more humid of the two, averaging 82% relative humidity over the year against 69% in Perth.
The most comfortable months in Cologne are June, July and August, when average temperatures are at their mildest.
Perth is at its most pleasant around April, May and November, based on the mildest average temperatures of the year.
Perth is the warmer city in 9 of the 12 months of the year. The gap is widest in January, about 24.2°C (43.6°F), and narrowest in September, about 0.5°C (0.9°F).
Cologne has the bigger seasonal swing, about 19.1°C (34.4°F) between its coldest and hottest months versus 9.9°C (17.8°F) in Perth — so Perth has the steadier, more even climate.
On climate alone, Perth comes out ahead — it offers warmer days, less rain and lower humidity than Cologne. Cologne 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 Cologne and Perth, not a single year's weather or a short-range forecast.
