Seattle in August
In August, Seattle averages 25°C (76°F) during the day and 15°C (59°F) at night, with around 10 days of rain (27 mm total).
High seasonConditions are comfortable for sightseeing without being sweltering. Plan for unsettled weather and bring rain gear.
It's peak hurricane season in Seattle during August. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How August compares to the rest of the year in Seattle
August is one of the warmest months in Seattle (1st of 12) and one of the driest months (11th of 12). Daytime temperature runs 10°C above the annual average (15°C). August runs roughly the same as July (25°C) and cools 4°C in September (20°C).
August sunrise & sunset in Seattle
Times shown for Seattle local time (America/Los_Angeles), calculated for the 15th of August. They shift by a few minutes day to day across the month.
Photography light in Seattle — August
Golden-hour and blue-hour windows for the 15th of August, in Seattle's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Seattle in August
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on August's tier (High season) and Seattle's popularity.
Crowds & pricing — August in Seattle
This is a busy month in Seattle — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: excellent tourism weather Northern Hemisphere summer holidays peak hazard season (1 active)
Sun & mosquito risk — August in Seattle
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Seattle in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 8°C / 47°F | 3°C / 37°F | 182 mm | 21 | — |
| February | 8°C / 46°F | 2°C / 36°F | 125 mm | 21 | — |
| March | 11°C / 52°F | 4°C / 39°F | 123 mm | 20 | — |
| April | 14°C / 57°F | 6°C / 42°F | 93 mm | 19 | — |
| May | 18°C / 65°F | 10°C / 49°F | 56 mm | 16 | — |
| June | 21°C / 70°F | 12°C / 54°F | 50 mm | 14 | — |
| July | 25°C / 76°F | 15°C / 58°F | 16 mm | 8 | — |
| August | 25°C / 76°F | 15°C / 59°F | 27 mm | 10 | — |
| September | 20°C / 69°F | 12°C / 54°F | 65 mm | 15 | — |
| October | 15°C / 59°F | 9°C / 48°F | 138 mm | 18 | — |
| November | 10°C / 50°F | 5°C / 41°F | 178 mm | 21 | — |
| December | 7°C / 45°F | 3°C / 37°F | 185 mm | 20 | — |
Other cities with similar August weather
🌍 See the full ranked list of climate twins for Seattle in August →
Frequently asked questions
How hot is Seattle in August?
In August, Seattle averages a high of 25°C (76°F) and a low of 15°C (59°F) — generally warm.
Does it rain a lot in Seattle in August?
August can be fairly wet in Seattle, with about 10 rainy days on average.
Is August a good time to visit Seattle?
August is warm. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Seattle in August?
Pack light layers for warm days and cooler evenings, plus a compact umbrella or rain jacket. See the full August packing list for Seattle for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.