Rainy Season in Seattle — When It Is & What to Expect
Seattle has a distinct rainy season covering October to February, when roughly 784mm of rain falls — the bulk of the annual total. The wettest month is January (216.0mm over about 20 rainy days). Outside these months rainfall drops sharply, which is why the best time to visit is All year.
Seattle — Monthly Rainfall
Average monthly rainfall in millimetres, calculated from 2020–2023 data. Highlighted bars mark the rainy season.
Rainfall in Seattle month by month
| Month | Rain | Rainy days | High | Rating |
|---|---|---|---|---|
| January Wet | 216.0mm | 20 | 8.3°C | 8/10 |
| February Wet | 104.8mm | 14 | 8.0°C | 9/10 |
| March | 82.6mm | 14 | 10.2°C | 10/10 |
| April | 73.7mm | 13 | 13.3°C | 10/10 |
| May | 64.7mm | 11 | 17.4°C | 10/10 |
| June | 58.6mm | 9 | 20.9°C | 10/10 |
| July | 8.0mm | 2 | 24.6°C | 10/10 |
| August | 21.5mm | 5 | 24.9°C | 10/10 |
| September | 66.1mm | 8 | 21.3°C | 10/10 |
| October Wet | 104.4mm | 13 | 15.4°C | 9/10 |
| November Wet | 174.8mm | 18 | 10.0°C | 9/10 |
| December Wet | 184.1mm | 20 | 7.6°C | 9/10 |
Should you visit Seattle during rainy season?
It can still work. Rain in the wet season often falls in short, intense bursts rather than all-day washouts, prices are lower and crowds thinner. But expect high humidity, disrupted boat trips and island transfers, and the occasional flooded street.
Best time to avoid the rain
The driest, most comfortable window is All year — see the full best time to visit Seattle guide for the month-by-month breakdown.
Frequently Asked Questions
When is rainy season in Seattle?
Rainy season in Seattle runs October to February, peaking in January with 216.0mm of rain.
What is the wettest month in Seattle?
January — averaging 216.0mm of rain over roughly 20 rainy days.
Can you visit Seattle during rainy season?
It can still work. Rain in the wet season often falls in short, intense bursts rather than all-day washouts, prices are lower and crowds thinner. But expect high humidity, disrupted boat trips and island transfers, and the occasional flooded street.
When is the dry season in Seattle?
The driest, most comfortable months are All year — see the best time to visit Seattle guide.
Travelling in the wet season anyway?
Pack right for it — the full checklist is on our sister site.
Seattle packing list →Compare Hertz, Avis, Budget, Sixt and 800+ rental companies — book now, pay at pickup.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youAs an Amazon Associate we earn from qualifying purchases. Links below are affiliate links.
Check your Seattle packing list at 247PackingList for a full wet-season checklist. For country facts, see our United States guide at 247CountryInfo.
Wet season essentials for Seattle
Compact travel umbrella
Windproof, fits in a daypack, dries fast — non-negotiable in monsoon season.
Check Price →Packable waterproof jacket
Light enough for the humidity, sealed enough for the downpours.
Check Price →Dry bag
Keeps phones, passports and cameras dry through boat trips and sudden storms.
Check Price →More wet-season travel gear
Quick-dry travel clothing
Lightweight and quick-drying — ideal for high-humidity wet seasons.
Check Price →Last updated:
Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.