30YearWeather
Seattle in May
Seattle weather in May - United States
🌤️Mild & Comfortable

Seattle Weather in May

Plan your May trip to Seattle, United States. Based on 30 years of NASA data, expect temperatures of 17°C (high) to 9°C (low), with 25% rain probability and 8 hours of daily sunshine. Pack rain gear for around 13 rainy days.

Avg High
17°C

Hottest around day 31

Avg Low
9°C

Coolest around day 1

Rainy Days
13days

25% avg rain chance

Sunshine
8hrs/day

Spring season

Seattle May Weather Calendar

Click any day to see detailed weather information

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Connect

The area code for the City of Seattle is...

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for Seattle

Smart Flight Estimator

Airport-to-Airport Logistics

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Add your home location in settings to see airport details.

Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Major Hub
87/ 100
Traffic Index

Extremely busy airport

Peak Daily Arrivals

0

slots per day

Peak

May

Low

Nov

Monthly Traffic Distribution

508
Jan
533
Feb
558
Mar
595
Apr
740
May
696
Jun
707
Jul
713
Aug
675
Sep
584
Oct
498
Nov
575
Dec
Traffic Level
Low Season

Key Connections

Phoenix Sky Harbor (PHX)
Los Angeles (LAX)
San Francisco (SFO)
Anchorage Ted Stevens (ANC)
Denver (DEN)

Health & Safety Advisory

CDC travel health recommendations

No Requirements

No Special Vaccinations Required

Standard travel precautions apply

Source: CDC Travelers' Health

View Complete Health Guide

Is May a Good Time to Visit Seattle?

👍Very good conditions overall
Short Answer

Popular May in Seattle offers 17°C and 25% rain chance - excellent conditions that attract maximum visitors. Book 3-6 months ahead for best rates.

Decision Factors

Peak tourist season

100% of annual peak - expect crowds and peak prices

Near active volcano: Mount Rainier

Medium volcanic risk

Plenty of sunshine

10.2h of sunshine daily

Good For

  • 👨‍👩‍👧‍👦
    Families with children

    Comfortable 17.2°C temperatures and low 25% rain risk

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

  • 🌡️
    Heat-sensitive visitors

    Manageable 17.2°C without oppressive humidity

Who Should Avoid

  • 🏖️
    Beach lovers

    Sea temperature only undefined°C - too cold for comfortable swimming

  • 💰
    Budget travelers

    Peak season means premium prices everywhere

930 observations30-year historical data
Confidence: 95%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Seattle in May averages 17°C with 25% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Seattle in May

What are the temperatures in Seattle in May?

Daytime highs average 17°C, nights drop to 9°C. Temperatures remain fairly consistent.

How many rainy days in Seattle in May?

Expect around 13 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Seattle in May?

Layers are key. A medium-weight jacket and closed-toe shoes.

Is May peak season in Seattle?

This is shoulder season—moderate prices and manageable crowds.