30YearWeather
Seattle in March
Seattle weather in March - United States
🌧️Wet Season

Seattle Weather in March

Plan your March trip to Seattle, United States. Based on 30 years of NASA data, expect temperatures of 11°C (high) to 3°C (low), with 43% rain probability and 8 hours of daily sunshine. Pack rain gear for around 31 rainy days.

Avg High
11°C

Hottest around day 28

Avg Low
3°C

Coolest around day 6

Rainy Days
31days

43% avg rain chance

Sunshine
8hrs/day

Spring season

Seattle March 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 March a Good Time to Visit Seattle?

👌A reasonable choice for your trip
Short Answer

Monsoon conditions shape Seattle's March: expect 43% daily rain chance. Mornings often clear before afternoon showers - early starts recommended.

Decision Factors

Very high humidity

80% average humidity

Near active volcano: Mount Rainier

Medium volcanic risk

Shoulder season - balanced conditions

75% of peak - good value with moderate crowds

Good For

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

Who Should Avoid

  • 🏖️
    Beach lovers

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

  • 👴
    Elderly travelers

    80% humidity creates difficult conditions

930 observations30-year historical data
Confidence: 95%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Seattle in March averages 11°C with 43% precipitation probability."

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

Frequently Asked Questions: Seattle in March

What are the temperatures in Seattle in March?

Daytime highs average 11°C, nights drop to 3°C. Temperatures remain fairly consistent.

How many rainy days in Seattle in March?

Expect around 31 days with measurable rainfall. An umbrella is advisable.

What to wear in Seattle in March?

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

Is March peak season in Seattle?

This is shoulder season—moderate prices and manageable crowds.