Seattle month by month
Plan your visit to Seattle by month. Compare weather, crowds, events, and prices across all twelve months with historical climate data.
Seattle's measured year divides unevenly. Six months, November through April, sit between 8 C and 13 C with 14 to 20 rain days each. December is the wettest at 20 rain days. November follows at 17. The warm window is shorter. June through September reach 21 C to 25 C, and rain days fall to single digits, with July recording 1. May is the pivot, when highs reach 17 C and rain days drop to 10. October resets to 15 C and 14 rain days.
TTDI publishes 12 month guides for Seattle. For summer trips, start with July or August. Both reach 25 C, but July logs 1 rain day where August logs 6. May and September cover the shoulder season at 17 to 21 C with 7 to 10 rain days. November through March sit between 8 and 11 C, but their rain counts range from 14 to 20. December averages 20 rain days, February averages 14.
July is Seattle's most decisive month, reaching 25 C with 1 rain day on a calendar where every other month logs at least 6.
- January
- High
- 8°C
- Low
- 3°C
- Rain
- 171 mm
January in Seattle means gray. That is the single most important thing to know. The city averages about 8.5 hours between sunrise and sunset, and most of those hours arrive behind…
- February
- High
- 8°C
- Low
- 2°C
- Rain
- 109 mm
February in Seattle is gray. That's the single most important thing to know. The city sits under a low, solid overcast that rarely lifts for more than a few hours at a stretch,…
- March
- High
- 11°C
- Low
- 4°C
- Rain
- 98 mm
March in Seattle is the month when winter starts to loosen its grip, though it hasn't let go yet. Daytime highs hover around 10.9°C (52°F), nights still dip to 4°C (39°F), and…
- April
- High
- 13°C
- Low
- 6°C
- Rain
- 73 mm
April in Seattle is the month the city starts to believe spring might stick around. After 5 or 6 months of gray overcast skies and steady rain, you'll notice something different.…
- May
- High
- 17°C
- Low
- 9°C
- Rain
- 56 mm
May is the month Seattle locals wait for. After 6 consecutive months of grey skies and 100-200mm of monthly rainfall from November through April, May drops to 56mm across about 10…
- June
- High
- 21°C
- Low
- 12°C
- Rain
- 48 mm
June is when Seattle finally shakes off the gray. After 8 months of overcast skies and steady drizzle, the clouds thin out sometime around mid-June, and the city collectively…
- July
- High
- 25°C
- Low
- 15°C
- Rain
- 7 mm
July is when Seattle finally becomes the city you pictured when you booked the ticket. The rain stops. Not tapers off, not decreases. Stops. Average rainfall drops to 7mm for the…
- August
- High
- 25°C
- Low
- 15°C
- Rain
- 31 mm
August is the month Seattle has been waiting for since October. Average highs reach 25°C (77°F) with lows around 15°C (60°F), and the city sees roughly 31mm of rainfall across…
- September
- High
- 21°C
- Low
- 13°C
- Rain
- 50 mm
September in Seattle is the last full month of dry weather before the rain returns in October and doesn't let up until June. Daytime highs sit around 21°C (70°F), nights cool to…
- October
- High
- 15°C
- Low
- 9°C
- Rain
- 111 mm
October is when Seattle's rain comes back. That's the single most important thing to know. After 3 months of nearly bone-dry summer skies, the city shifts gears around the first…
- November
- High
- 10°C
- Low
- 6°C
- Rain
- 172 mm
November is when Seattle becomes the city of its reputation. The rain is real. Expect 172mm of precipitation across 17 rainy days, with highs around 10°C (51°F) and lows near 6°C…
- December
- High
- 8°C
- Low
- 4°C
- Rain
- 201 mm
December in Seattle means darkness. That's the single most important thing to know before you book. The sun sets before 4:20 PM, and on many days, thick cloud cover makes it feel…