Seattle is 5.2°C (9.4°F) warmer by day, Seattle has 4.4°C (7.9°F) warmer nights, Vancouver gets 898 mm (35.4 in) more rain a year.
Seattle is at its warmest in July and coolest in December, while Vancouver peaks in August and bottoms out in December. Month for month, Seattle is the warmer of the two in 12 of 12 months.
Vancouver is the wetter of the two, collecting 2,153 mm (84.8 in) of rain a year against 1,255 mm (49.4 in) in Seattle. The most comfortable time to visit is June, July and August in Seattle and June, July and August in Vancouver.
| Seattle | Metric | Vancouver |
|---|---|---|
| 🌡️ Temperature | ||
| 21.5°C | 🌡️Average daytime high | 16.3°C |
| 2°C | 🌙Average nighttime low | -2.4°C |
| July | 🔥Hottest month | August |
| December | ❄️Coldest month | December |
| 🌧️ Rain | ||
| 1,255 mm | 🌧️Annual rainfall | 2,153 mm |
| November | ☔Wettest month | November |
| July | 🏜️Driest month | July |
| 💨 Climate | ||
| 83% | 💧Average humidity | 85% |
| 0.7 m/s | 💨Average wind speed | 0.8 m/s |
Overnight, Seattle typically falls to around 2°C (35.6°F) while Vancouver settles near -2.4°C (27.7°F).
Seattle is hottest in July and coldest in December, whereas Vancouver peaks in August and is coolest in December.
Seattle sees the most rain in November and the least in July; Vancouver is wettest in November and driest in July.
Vancouver feels the more humid of the two, averaging 85% relative humidity against 83%.
For Vancouver, 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 | Seattle | Vancouver | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | -4.3 | 3.9 | 12.1 | -12.8 | -4❄️ | 4.8 |
| February | -4 | 4.8 | 13.6 | -11.9 | -3.2 | 5.5 |
| March | -1.2 | 8 | 17.2 | -7.7 | 0.5 | 8.7 |
| April | 1 | 11.5 | 22.1 | -3.4 | 5.8 | 15.1 |
| May | 3.7 | 14.8 | 26 | 1.3 | 11.6 | 21.9 |
| June | 6.7 | 17.5 | 28.3 | 5.5 | 15.6 | 25.6 |
| July | 9.5 | 19.9 | 30.3 | 8.4 | 18.2 | 27.9 |
| August | 9.8 | 20🔥 | 30.2 | 8.6 | 18.3🔥 | 28.1 |
| September | 6.9 | 17.5 | 28.1 | 4.8 | 14.9 | 25 |
| October | 2 | 12.3 | 22.5 | -1 | 8.6 | 18.2 |
| November | -2 | 6.8 | 15.5 | -8.4 | 0.7 | 9.8 |
| December | -4.5 | 3.7❄️ | 12 | -12.8 | -3.9 | 5 |
| Annual Avg | 2 | 11.7 | 21.5 | -2.5 | 6.9 | 16.3 |
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 Seattle and Vancouver feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Seattle Vancouver
See how Seattle and Vancouver 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 Seattle and Vancouver — each drawn straight from the climate figures above.
Seattle is the warmer of the two. It averages daytime highs of 21.5°C (70.7°F) against 16.3°C (61.3°F) in Vancouver — roughly 5.2°C (9.4°F) warmer by day. Nights are milder in Seattle, with average lows of 2°C (35.6°F) versus -2.4°C (27.7°F).
Seattle is hottest in July, averaging highs of about 30.3°C (86.5°F), while Vancouver peaks in August at around 28.1°C (82.5°F). That makes Seattle the hotter of the two at the height of summer.
Vancouver gets colder. In its coldest month (December) overnight lows average about -12.8°C (8.9°F), compared with -4.5°C (23.8°F) at the low point of the year in Seattle.
Vancouver is the wetter city, collecting about 2,153 mm (84.8 in) of rain a year versus 1,255 mm (49.4 in) in Seattle. Seattle is wettest in November and driest in July; Vancouver is wettest in November and driest in July.
Vancouver is the more humid of the two, averaging 85% relative humidity over the year against 83% in Seattle.
The most comfortable months in Seattle are June, July and August, when average temperatures are at their mildest.
Vancouver 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 all 12 months of the year. The gap is widest in February, about 8°C (14.4°F), and narrowest in July, about 1.7°C (3.1°F).
Vancouver has the bigger seasonal swing, about 22.3°C (40.1°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, Seattle comes out ahead — it offers warmer days and less rain than Vancouver. Vancouver is the better fit only if you'd actually prefer cooler weather and 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 Seattle and Vancouver, not a single year's weather or a short-range forecast.
