Weather in Сиэтл by month: what to expect

Сиэтл is known for its mild but changeable climate, where rain is a frequent companion. The city rarely sees extreme temperatures, but the weather shifts noticeably from season to season. Winters in Сиэтл are cool and wet, while summers bring warmer, drier days with plenty of sunshine.

From November to March, Сиэтл experiences its wettest period, with frequent showers and overcast skies. By April, the rain eases, and temperatures begin to rise. The driest and warmest months—June through September—are ideal for exploring Сиэтл’s outdoor spaces, though even then, a light jacket may come in handy for cooler evenings.

Temperatures in Сиэтл remain moderate year-round, with winters hovering around +5.8 °C in January and summers reaching up to +26.1 °C in July and August. The city’s proximity to the Pacific Ocean keeps extremes at bay, though nights can feel chilly even in summer, dropping to +14.2 °C in July.

Spring and autumn in Сиэтл offer pleasant transitions. By May, daytime highs climb to +19.5 °C, while September still sees warm afternoons around +22.1 °C. Even in October, temperatures remain mild at +15.9 °C, though the return of rain signals the shift toward cooler months. If you prefer cooler weather, March and April provide a balance between crisp air and fewer crowds.

Сиэтл’s reputation for rain is well-earned, with the heaviest downpours occurring from November to January. December sees the most precipitation, averaging 169 mm, while July is the driest month with just 6.4 mm. Even during the wet season, rain often comes in light, steady showers rather than heavy storms.

The dry season in Сиэтл runs from May to September, with June and July offering the most reliable sunshine. However, even in summer, occasional drizzle can occur, so it’s wise to keep a compact umbrella handy. By October, rainfall increases again, marking the start of the city’s long, damp winter.

Packing for Сиэтл depends on the season, but layers are always a good idea. In winter, bring a waterproof jacket, warm sweaters, and sturdy shoes for navigating wet sidewalks. Even in January, temperatures rarely drop below +3 °C, so heavy winter gear is unnecessary, but a scarf and gloves can be useful for windy days.

For summer visits, lightweight clothing is ideal, though evenings can be cool even in July and August. A light jacket or cardigan will help you stay comfortable when temperatures dip after sunset. If you’re visiting in April or October, pack a mix of short- and long-sleeve options, along with a waterproof layer for unexpected showers. Comfortable walking shoes are a must year-round in Сиэтл.