Monthly climate guide
Seattle weather in May
May in Seattle is typically mild, with average daytime highs around 18°C (64°F) and night-time lows near 9°C (47°F). The month usually brings about 70 mm of rain (some rain) and is often cloudy. Daytime highs are 4°C warmer than April and 2°C cooler than June.
What stands out in May
- Seattle is usually about 8°C cooler than Memphis in May.
- In Seattle, May is late spring.
Avg high
18°C
64°F
Avg low
9°C
47°F
Rainfall
70 mm
some rain
Humidity
80%
relative
Sky
69%
cloud · often cloudy
Seattle weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 7°C / 45°F | 2°C / 35°F | 169 mm | 90% | 79% |
| February | 8°C / 46°F | 2°C / 35°F | 138 mm | 88% | 78% |
| March | 11°C / 51°F | 3°C / 38°F | 155 mm | 85% | 76% |
| April | 14°C / 56°F | 5°C / 41°F | 107 mm | 82% | 75% |
| May | 18°C / 64°F | 9°C / 47°F | 70 mm | 80% | 69% |
| June | 20°C / 68°F | 11°C / 51°F | 51 mm | 80% | 68% |
| July | 23°C / 73°F | 13°C / 56°F | 20 mm | 78% | 47% |
| August | 24°C / 75°F | 14°C / 56°F | 23 mm | 77% | 46% |
| September | 21°C / 69°F | 11°C / 52°F | 65 mm | 79% | 55% |
| October | 15°C / 60°F | 8°C / 46°F | 142 mm | 85% | 68% |
| November | 10°C / 50°F | 4°C / 39°F | 184 mm | 89% | 76% |
| December | 7°C / 44°F | 2°C / 35°F | 172 mm | 91% | 78% |
What to pack for May
- A warm sweater or fleece for layering
- A mid-weight jacket
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is May a good time to visit Seattle?
Compare the months in the chart above to find your ideal window.
Best time to visit Seattle →Other United States cities in May
Cite or embed this data
Writing about this destination? Copy a ready-made citation or embed a live widget — free, just keep the link.
Seattle weather in May. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/seattle/may
<a href="https://weathercompare.eu/weather/usa/seattle/may">Seattle weather in May</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/seattle" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Seattle weather in May"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/seattle/may">Seattle weather in May</a> – WeatherCompare</p>
Seattle in May: quick answers
Is May a good time to visit Seattle?
May is a reasonable time for Seattle: highs around 18°C and about 70 mm of rain, though not one of the three best months.
How warm is Seattle in May?
Average highs are about 18°C (64°F) and average lows about 9°C (47°F), based on 10 years of daily data.
Does it rain a lot in Seattle in May?
Seattle typically gets around 70 mm of rain in May — some rain.
Figures are long-term averages for the area around Seattle (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.