San Diego weather by month

by Posted on

San Diego is renowned for its idyllic climate, often called the best in the United States. But “pleasant” can mean different things depending on the time of year. This comprehensive guide breaks down the San Diego weather by month, helping you plan the perfect visit – or simply appreciate the beauty of living in America’s Finest City. We’ll cover average temperatures, rainfall, sunshine hours, and what to expect for various activities.

Overview of San Diego’s Climate

San Diego boasts a Mediterranean climate characterized by warm, dry summers and mild, wet winters. The Pacific Ocean plays a significant role in moderating temperatures, keeping things relatively consistent throughout the year. Microclimates exist throughout the county, meaning coastal areas will generally be cooler and more humid than inland valleys and deserts. This guide provides general averages, but be prepared for slight variations depending on your specific location within San Diego.

San Diego Weather by Month: A Detailed Breakdown

Here’s a month-by-month look at what to expect:

Month Avg High (°F) Avg Low (°F) Rainfall (in) Sunshine Hours Humidity (%)
January 65 48 2.1 190 68
February 66 49 2.3 204 67
March 68 51 1.8 237 65
April 70 54 0.8 264 63
May 72 57 0.4 286 61
June 75 61 0.2 297 60
July 77 64 0.1 310 62
August 78 65 0.1 304 64
September 77 64 0.3 288 65
October 74 59 0.9 258 67
November 69 53 1.5 216 69
December 65 48 1.9 198 70

January & February: These are the coolest and wettest months, though “wet” is relative. Expect mild days, cool evenings, and occasional rain showers. Gray whale watching season begins!

March & April: Spring arrives, bringing warmer temperatures and blooming wildflowers. Rainfall decreases significantly. Perfect for hiking and exploring the outdoors.

May, June, & July: Summer is in full swing! Expect warm, sunny days and comfortable evenings. “June Gloom” – a morning marine layer – is common, but typically burns off by midday. Beach days are a must.

August & September: These are often the warmest months, with consistently sunny skies. September is particularly pleasant, with warm water temperatures ideal for swimming.

October & November: Temperatures begin to cool down, and the marine layer returns more frequently. This is a great time for outdoor activities without the summer crowds.

December: Mild temperatures continue, with a slightly increased chance of rain. The holiday season brings festive events and a cheerful atmosphere.

Best Time to Visit San Diego

Determining the "best" time depends on your preferences:

  • For Warmest Weather: August & September

  • For Budget Travelers: January – March (excluding holidays) & November

  • For Whale Watching: January – March (Gray Whales) & December – April (Blue Whales)

  • For Avoiding Crowds: April – May & September – October

  • For Surfing: Fall & Winter (larger swells)

What to Pack for San Diego

Layering is key! Even in summer, evenings can be cool. Here’s a general packing list:

  • Light jacket or sweater: Essential year-round.

  • Sunscreen: Always!

  • Hat & Sunglasses: Protect yourself from the sun.

  • Swimsuit: For beach days and pool time.

  • Comfortable walking shoes: For exploring.

  • Light layers: T-shirts, shorts, and long-sleeved shirts.

  • Rain jacket (November – February): Just in case.

Frequently Asked Questions (FAQ)

Q: Does it ever get cold in San Diego?
A: Rarely. Frost is uncommon, and snow is extremely rare, even in the mountains.

Q: Is San Diego always sunny?
A: Not always, but it’s sunny most of the time. “June Gloom” and marine layer can bring overcast mornings, especially in the spring and summer.

Q: What is "June Gloom"?
A: A weather pattern where a layer of marine clouds forms in the morning, typically burning off by afternoon.

Q: Is San Diego humid?
A: Coastal areas can be moderately humid, but inland areas are generally dry.

Q: What’s the water temperature like?
A: It varies, but generally ranges from 60-70°F (15-21°C). September is often the warmest.

Resources

Rate this post

Published by admin