When to go · SeaTac
SeaTac in May
Great month. Inside SeaTac's best window: May–Oct (mild weather, fewer rain days).
Key facts
- Verdict
- Great
- Temperature
- 19°C (66°F)66°F (19°C) / 9°C (48°F)48°F (9°C)
- average high / low
- Rain days
- 6
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Inside SeaTac's best window: May–Oct (mild weather, fewer rain days).
Is another month better than May?
No other month rates higher than May for SeaTac in this guide.
Weather in May
- SeaTacHighs around 19 °C (66 °F), lows around 9 °C (48 °F), rain on about 6 daysHighs around 66 °F (19 °C), lows around 48 °F (9 °C), rain on about 6 days
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Memorial Day big impact
Last Monday of May · United States
Start of summer; roads and beaches full.
Crowds and prices
- Crowds · United States overall
- Medium
- Prices · United States overall
- Medium
United States overall: Warm and green; Memorial Day (last Monday) opens the summer season; timed-entry systems start at some parks.
Compare two months
Weather, crowds and prices for any two months in SeaTac, side by side.
Verdict
May: Great
Jun: Great
Daytime high
May: 19 °C (66 °F)66 °F (19 °C)
Jun: 23 °C (73 °F)73 °F (23 °C)
Night low
May: 9 °C (48 °F)48 °F (9 °C)
Jun: 12 °C (54 °F)54 °F (12 °C)
Rain days
May: 6
Jun: 5 (better)
Crowds
May: Medium
Jun: High
Prices
May: Medium
Jun: High
Festivals listed
May: 1
Jun: 0
May: Inside SeaTac's best window: May–Oct (mild weather, fewer rain days).
June: Inside SeaTac's best window: May–Oct (mild weather, fewer rain days).
SeaTac: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings