Vancouver vs Seattle

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Seattle edges ahead as the better destination in September. Seattle offers 10 hours of daily sunshine with only 8 rain days, while Vancouver sees 10 sunshine hours and 10 rain days.

Vancouver sits in the comfortable travel range at 20°C. Seattle is also comfortable at 21°C.

For travelers who prioritize dry weather, Seattle is the stronger choice in September.

Vancouver reaches an average high of 20°C (68°F) and drops to 13°C (55°F) at night during September. The daily temperature range is 7°C, meaning relatively stable temperatures from day to night.

Seattle averages 21°C (70°F) for the high and 12°C (54°F) for the low, with a daily range of 9°C. The two cities feel quite similar in terms of temperature.

Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in September.

Vancouver receives approximately 117 mm of rainfall across 10 rain days during September. You can expect rain roughly every other day.

Seattle sees 64 mm over 8 rain days. That makes Seattle the drier option by 2 rain days and 53 mm of total precipitation.

Both cities share similar humidity levels at 65%.