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Best Time to Visit Seattle
Real month-by-month weather for Seattle, and real flight prices from London — so "best time" here means something you can check, not a generic guess. July runs warmest (28°C avg high).
Seattle by month: weather & fares
Weather is averaged from 3 years of real historical data. Fares are the real cheapest on file from London that month.
| Month | Avg high / low | Avg rainfall | Cheapest fare |
|---|---|---|---|
| January | 7° / 2°C | ~141mm | — |
| February | 8° / 2°C | ~119mm | — |
| March | 12° / 3°C | ~124mm | — |
| April | 14° / 5°C | ~103mm | — |
| May | 19° / 9°C | ~41mm | — |
| June | 22° / 11°C | ~42mm | — |
| July | 28° / 14°C | ~8mm | — |
| August | 26° / 14°C | ~49mm | — |
| September | 22° / 12°C | ~61mm | — |
| October | 16° / 8°C | ~115mm | — |
| November | 11° / 5°C | ~205mm | — |
| December | 9° / 4°C | ~249mm | — |
Nearby airports
- Boeing Field King County International Airport (BFI)9 km
- Tacoma Narrows Airport (TIW)29 km
- Snohomish County (Paine Field) Airport (PAE)51 km
- Olympia Regional Airport (OLM)70 km
Planning tips for Seattle
- Compare the weather and fare columns above together — the cheapest month isn't always the best-weather month.
- Shoulder-season travel (just before or after the busiest months) often balances good weather against lower prices.
- Book 4-8 weeks ahead where possible — a general pattern, not a guarantee for this specific destination.
- Check nearby airports above if Seattle has real alternatives — a short extra journey can mean a much lower fare.
- Factor in local public holidays and school terms at your destination, not just at home — prices and crowds follow both.
- Re-check rainfall, not just temperature — a warm month can still be a very wet one.
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FAQs — Best time to visit Seattle
July has the highest average temperatures, based on 3 years of real historical weather data.