Cologne and Seattle have similar daytime temperatures, Seattle has 2°C (3.6°F) warmer nights, Seattle gets 433 mm (17 in) more rain a year.
Cologne is at its warmest in August and coolest in January, while Seattle peaks in July and bottoms out in December. Month for month, Seattle is the warmer of the two in 9 of 12 months.
Seattle is the wetter of the two, collecting 1,255 mm (49.4 in) of rain a year against 822 mm (32.4 in) in Cologne. The most comfortable time to visit is June, July and August in Cologne and June, July and August in Seattle.
| Cologne | Metric | Seattle |
|---|---|---|
| 🌡️ Temperature | ||
| 21.1°C | 🌡️Average daytime high | 21.5°C |
| 0°C | 🌙Average nighttime low | 2°C |
| August | 🔥Hottest month | July |
| January | ❄️Coldest month | December |
| 🌧️ Rain | ||
| 822 mm | 🌧️Annual rainfall | 1,255 mm |
| December | ☔Wettest month | November |
| April | 🏜️Driest month | July |
| 💨 Climate | ||
| 82% | 💧Average humidity | 83% |
| 3 m/s | 💨Average wind speed | 0.7 m/s |
Overnight, Cologne typically falls to around 0°C (32°F) while Seattle settles near 2°C (35.6°F).
Cologne is hottest in August and coldest in January, whereas Seattle peaks in July and is coolest in December.
Cologne sees the most rain in December and the least in April; Seattle is wettest in November and driest in July.
Seattle feels the more humid of the two, averaging 83% relative humidity against 82%.
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 | Cologne | Seattle | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | -8.2 | 1.1❄️ | 10.5 | -4.3 | 3.9 | 12.1 |
| February | -7.4 | 2.2 | 11.9 | -4 | 4.8 | 13.6 |
| March | -4 | 6.5 | 16.9 | -1.2 | 8 | 17.2 |
| April | -2.2 | 9.6 | 21.4 | 1 | 11.5 | 22.1 |
| May | 2.1 | 13.7 | 25.2 | 3.7 | 14.8 | 26 |
| June | 6.1 | 17.7 | 29.2 | 6.7 | 17.5 | 28.3 |
| July | 8.9 | 20.2🔥 | 31.6 | 9.5 | 19.9 | 30.3 |
| August | 8.6 | 20.1 | 31.7 | 9.8 | 20🔥 | 30.2 |
| September | 5.4 | 16.2 | 27 | 6.9 | 17.5 | 28.1 |
| October | 0.6 | 11.2 | 21.7 | 2 | 12.3 | 22.5 |
| November | -3.2 | 6.1 | 15.3 | -2 | 6.8 | 15.5 |
| December | -6.8 | 2.2 | 11.2 | -4.5 | 3.7❄️ | 12 |
| Annual Avg | 0 | 10.6 | 21.1 | 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 Cologne and Seattle feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Cologne Seattle
See how Cologne 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 Cologne and Seattle — each drawn straight from the climate figures above.
Cologne and Seattle are about equally warm. Daytime highs average 21.1°C (70°F) in Cologne and 21.5°C (70.7°F) in Seattle, so neither is clearly the warmer choice over the year. Nights are milder in Seattle, with average lows of 2°C (35.6°F) versus 0°C (32°F).
Cologne is hottest in August, averaging highs of about 31.7°C (89°F), while Seattle peaks in July at around 30.3°C (86.5°F). That makes Cologne 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 -4.5°C (23.8°F) at the low point of the year in Seattle.
Seattle is the wetter city, collecting about 1,255 mm (49.4 in) of rain a year versus 822 mm (32.4 in) in Cologne. Cologne is wettest in December and driest in April; Seattle is wettest in November and driest in July.
Humidity is similar in both, averaging around 82% in Cologne and 83% in Seattle across the year.
The most comfortable months in Cologne are June, July and August, 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.
Seattle is the warmer city in 9 of the 12 months of the year. The gap is widest in January, about 2.8°C (5°F), and narrowest in August, about 0.1°C (0.2°F).
Cologne has the bigger seasonal swing, about 19.1°C (34.4°F) between its coldest and hottest months versus 16.3°C (29.3°F) in Seattle — so Seattle has the steadier, more even climate.
On climate alone, Cologne comes out ahead — it offers less rain than Seattle. Seattle is the better fit only if you'd actually prefer more rainfall.
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 Seattle, not a single year's weather or a short-range forecast.
