SeaTac Weather in May

SeaTac in May sees pleasant daytime temperatures of 19°C (66°F) and nighttime lows of 9°C (48°F). Moderate rainfall is typical, with around 54 mm (2.1 in) for the month.

Rainfall in SeaTac in May

You can expect rain on around 12 days based on historical patterns, with 54 mm (2.1 in) average for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in SeaTac in May

In May, expect pleasant temperatures in SeaTac, with highs of 19°C (66°F) and lows of 9°C (48°F) at night. The difference between afternoon and evening temperatures is usually noticeable. Nights drop to 9°C (48°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.

Sunshine in SeaTac in May

Enjoy a sunny month with about 254 hours of sunshine, the clear skies make SeaTac even more beautiful.

Wind Speed in SeaTac in May

May sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

For SeaTac itself, June, July, August and September generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.