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

San Francisco Weather in May

Plan your May trip to San Francisco, United States. Based on 30 years of NASA data, expect temperatures of 18°C (high) to 11°C (low), with 5% rain probability and 8 hours of daily sunshine. The Pacific Ocean averages 13°C in May. Great conditions with only 0 rainy days expected.

Avg High
18°C

Hottest around day 30

Avg Low
11°C

Coolest around day 1

Rainy Days
0days

5% avg rain chance

Sunshine
8hrs/day

Spring season

Sea Temperature in May

Pacific Ocean

13.4°C

Monthly Average

Water Feel
🥶Polar Plunge

Consider a wetsuit for extended swimming

Swim Rating
❄️Cold water hazard

Based on average sea surface temperature

Body of Water
Pacific Ocean

San Francisco coastline

San Francisco May Weather Calendar

Click any day to see detailed weather information

Day 1
partly-cloudy-day
Nice
18°C6%
Day 2
partly-cloudy-day
Nice
18°C8%
Day 3
partly-cloudy-day
Nice
18°C8%
Day 4
partly-cloudy-day
Nice
18°C6%
Day 5
partly-cloudy-day
Nice
18°C5%
Day 6
partly-cloudy-day
Nice
18°C5%
Day 7
partly-cloudy-day
Nice
18°C4%
Day 8
partly-cloudy-day
Nice
18°C4%
Day 9
partly-cloudy-day
Nice
18°C6%
Day 10
partly-cloudy-day
Nice
18°C4%
Day 11
partly-cloudy-day
Nice
18°C4%
Day 12
partly-cloudy-day
Nice
18°C6%
Day 13
partly-cloudy-day
Nice
18°C8%
Day 14
partly-cloudy-day
Nice
18°C7%
Day 15
partly-cloudy-day
Nice
18°C10%
Day 16
partly-cloudy-day
Nice
18°C12%
Day 17
partly-cloudy-day
Nice
18°C11%
Day 18
partly-cloudy-day
Nice
18°C10%
Day 19
partly-cloudy-day
Nice
18°C8%
Day 20
partly-cloudy-day
Nice
18°C6%
Day 21
partly-cloudy-day
Nice
18°C3%
Day 22
partly-cloudy-day
Nice
18°C4%
Day 23
partly-cloudy-day
Nice
18°C2%
Day 24
partly-cloudy-day
Nice
18°C3%
Day 25
partly-cloudy-day
Nice
18°C3%
Day 26
partly-cloudy-day
Nice
18°C4%
Day 27
partly-cloudy-day
Nice
18°C2%
Day 28
partly-cloudy-day
Nice
18°C2%
Day 29
partly-cloudy-day
Nice
19°C1%
Day 30
partly-cloudy-day
Nice
19°C0%
Day 31
partly-cloudy-day
Nice
19°C1%

Essential Travel Info for San Francisco

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Connect

Thearea codesfor San Francisco are 415 a...

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for San Francisco

Smart Flight Estimator

Airport-to-Airport Logistics

unlock smart flight estimates

Add your home location in settings to see airport details.

Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Major Hub
100/ 100
Traffic Index

Extremely busy airport

Peak Daily Arrivals

0

slots per day

Peak

Jul

Low

Jun

Monthly Traffic Distribution

497
Jan
532
Feb
563
Mar
577
Apr
633
May
0
Jun
2177
Jul
1338
Aug
2051
Sep
1911
Oct
1736
Nov
1892
Dec
Traffic Level
Low Season

Key Connections

Los Angeles (LAX)
Seattle Tacoma (SEA)
New York John F Kennedy (JFK)
Las Vegas McCarran (LAS)
Phoenix Sky Harbor (PHX)

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 San Francisco?

👌A reasonable choice for your trip
Short Answer

⚠️ May falls in San Francisco's typhoon season. While daily weather averages 18°C with 5% rain, tropical storms can disrupt travel. Flexible bookings recommended.

Decision Factors

Eastern Pacific Hurricane season active

Eastern Pacific zone - expect potential eastern pacific hurricane activity

Off-peak season - fewer crowds

Only 29% of peak - better deals and quiet crowds

Excellent dry conditions

Only 5% rain probability - ideal for outdoor activities

Cold sea - swimming challenging

13.4°C sea temperature - Polar Plunge

Plenty of sunshine

12.3h of sunshine daily

Exceptional dining scene

151 Michelin-listed restaurants

Good For

  • 💰
    Budget travelers

    Off-peak pricing with acceptable weather conditions

  • 👨‍👩‍👧‍👦
    Families with children

    Comfortable 18°C temperatures and low 5% rain risk

  • 🥾
    Outdoor enthusiasts

    Ideal hiking conditions: 18°C, 5% rain chance

  • 📸
    Photographers

    12.3h sunshine, 59% clear skies for golden hour shots

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

Who Should Avoid

  • 🏖️
    Beach lovers

    Sea temperature only 13.4°C - too cold for comfortable swimming

  • 👴
    Elderly travelers

    75% humidity creates difficult conditions

  • 💼
    Business travelers

    Storm season may cause flight disruptions

930 observations30-year historical data
Confidence: 99%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,San Francisco in May averages 18°C with 5% precipitation probability."

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

Frequently Asked Questions: San Francisco in May

What are the temperatures in San Francisco in May?

Daytime highs average 18°C, nights drop to 11°C. Temperatures remain fairly consistent.

How many rainy days in San Francisco in May?

Expect around 0 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in San Francisco in May?

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

Is May peak season in San Francisco?

This is typically peak season with higher prices. Book 2-3 months ahead.