The most comfortable time to visit Seattle is from late June to September. For walking, go from mid April to early November. Sunbathing weather is not what it offers.
When to go five ratings · thirty-six ten-day sections · click a cell to read it
Sun is not what Seattle is for: the Sunbathing rating tops out at 23, mostly because it is too cool. The clearest skies come in July, when the sky is typically 39% covered at midday (partly cloudy).
The being outside season here runs from late June to September. It peaks in mid July, at 91. The weakest stretch is from mid November to March, when it drops to 0, mostly because it is too cold.
For walking, go from mid April to early November. It peaks in mid September, at 92. Avoid December to early January for this: it falls to 19, mostly because it is too cold.
The year, measured
The average temperature in Seattle over the whole year is 11°C. July is the hottest month, with highs of about 23°C; February is the coldest, with lows of about 4°C. The rainy (wet) season in Seattle runs from October to April, peaking in November with a 24% chance of rain on a given day. The dry season is May to September; July is the driest month, at 4%. Winds in Seattle are highest in February, averaging 3.0 m/s (11 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW. The clearest skies in Seattle come in July, when the sky is typically 37% covered; December is the cloudiest month, at 75%.
Month by month Seattle climate by month: average temperatures year round · click a month to read it
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 7°C | 4°C | 3°C | 23% | 73% | 2.7 m/s | 0 | 0 | 24 |
| February | 7°C | 4°C | 3°C | 20% | 75% | 3.0 m/s | 0 | 0 | 22 |
| March | 10°C | 5°C | 6°C | 19% | 67% | 3.0 m/s | 3 | 0 | 41 |
| April | 12°C | 7°C | 9°C | 16% | 60% | 3.0 m/s | 10 | 0 | 65 |
| May | 16°C | 11°C | 13°C | 10% | 57% | 2.7 m/s | 37 | 2 | 86 |
| June | 19°C | 13°C | 16°C | 9% | 54% | 2.7 m/s | 62 | 6 | 86 |
| July | 23°C | 15°C | 20°C | 4% | 37% | 2.5 m/s | 88 | 16 | 76 |
| August | 23°C | 15°C | 21°C | 5% | 40% | 2.4 m/s | 86 | 21 | 71 |
| September | 18°C | 13°C | 17°C | 10% | 53% | 2.4 m/s | 72 | 5 | 86 |
| October | 14°C | 9°C | 11°C | 18% | 62% | 2.6 m/s | 22 | 0 | 79 |
| November | 9°C | 7°C | 6°C | 24% | 71% | 2.9 m/s | 3 | 0 | 44 |
| December | 7°C | 5°C | 3°C | 23% | 75% | 2.8 m/s | 0 | 0 | 22 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Seattle weather by season
Year round, Seattle has days of about 7°C at their warmest in January, its coolest month, and 23°C in July, its warmest; the coolest hours of the day run from 4°C to 15°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around November and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Seattle weather in winterDecember to February
Winter in Seattle has typical daily highs of about 7°C and lows of about 4°C, with a 22% chance of rain on a given day.
Seattle weather in springMarch to May
Spring in Seattle has typical daily highs of about 13°C and lows of about 8°C, with a 15% chance of rain on a given day.
Seattle weather in summerJune to August
Summer in Seattle has typical daily highs of about 21°C and lows of about 14°C, with a 6% chance of rain on a given day.
Seattle weather in autumnSeptember to November
Autumn in Seattle has typical daily highs of about 14°C and lows of about 10°C, with a 17% chance of rain on a given day.
When is the rainy season in Seattle?
The rainy (wet) season in Seattle runs from October to April, peaking in November with a 24% chance of rain on a given day. The dry season is May to September; July is the driest month, at 4%.
What time of year is Seattle windiest?
Winds in Seattle are highest in February, averaging 3.0 m/s (11 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW.
What is the average temperature in Seattle year round?
The average temperature in Seattle over the whole year is 11°C. July is the hottest month, with highs of about 23°C; February is the coldest, with lows of about 4°C.
Where to go instead in early January, the weakest time here for being outside
How this is worked out
Every figure is a decade of weather-station observations blended into one typical year, in ten-day sections. The ratings, the chart and the feels-like column are read at midday local solar time. Being outside is the Easy outdoors rating, Sun is Sunbathing and Walking is Active outdoors, each out of 100: Good from 55, Ideal from 80. They describe what a time of year is usually like here, not a forecast. The dotted links open the map at that time of year; set its time of day to midday to see these numbers.