What is the weather like in San Diego in December?

Expect temperatures between 9°C and 18°C with 11% average rain probability and about 8 hours of sunshine daily.

What is the weather like in San Diego in December?

San Diego in December scores 68/100 based on 30 years of climate data. Very good conditions overall.

Who should visit San Diego in December?

December in San Diego is ideal for: Families with children, Outdoor enthusiasts, Photographers, Cultural tourists, Honeymoon couples.

San Diego Weather in December | 30-Year Forecast

Avg High

18°C

Hottest around day 7

Avg Low

9°C

Coolest around day 27

Rainy Days

0days

11% avg rain chance

Sunshine

8hrs/day

Winter season

Sea Temperature in December

Coastal Waters(Ocean)

15.5°C

Monthly Average

Water Feel

💧Refreshing

Consider a wetsuit for extended swimming

Swim Rating

🏄Cool, wetsuits recommended

Based on average sea surface temperature

Body of Water

Coastal Waters

Ocean

San Diego coastline

Essential Travel Info for San Diego

🗓️ Best Time to Visit 📖 Travel Guide 🍴 Food Guide

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Connect

The most common area code for San Diego ...

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for San Diego

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

Well Connected

70/ 100

Traffic Index

Popular destination

Peak Daily Arrivals

slots per day

Peak

May

Low

Nov

Monthly Traffic Distribution

296

Jan

307

Feb

335

Mar

382

Apr

447

May

341

Jun

328

Jul

357

Aug

334

Sep

312

Oct

281

Nov

316

Dec

Traffic Level

Low Season

Key Connections

San Francisco (SFO)

Las Vegas McCarran (LAS)

Phoenix Sky Harbor (PHX)

Denver (DEN)

San Jose Norman Y. Mineta (SJC)

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 December a Good Time to Visit San Diego?

👍Very good conditions overall(68/100)

Short Answer

San Diego in December features 15.5°C seas - too cold for swimming but stunning for coastal walks. Air temperatures average 18°C with 11% rain probability.

Decision Factors

Excellent dry conditions

Only 11% rain probability - ideal for outdoor activities

Cold sea - swimming challenging

15.5°C sea temperature - Polar Plunge

Plenty of sunshine

8.1h of sunshine daily

Shoulder season - balanced conditions

71% of peak - good value with moderate crowds

Exceptional dining scene

34 Michelin-listed restaurants

Good For

👨‍👩‍👧‍👦
Families with children
Comfortable 17.7°C temperatures and low 11% rain risk
🥾
Outdoor enthusiasts
Ideal hiking conditions: 17.7°C, 11% rain chance
📸
Photographers
8.1h sunshine, 57% clear skies for golden hour shots
🏛️
Cultural tourists
Comfortable conditions for exploring museums and sites
💑
Honeymoon couples
Wedding score 97/100 with romantic weather conditions

Who Should Avoid

🏖️
Beach lovers
Sea temperature only 15.5°C - too cold for comfortable swimming

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,San Diego in December averages 18°C with 11% precipitation probability."

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

Frequently Asked Questions: San Diego in December

What are the temperatures in San Diego in December?

Daytime highs average 18°C, nights drop to 9°C. Temperatures remain fairly consistent.

How many rainy days in San Diego in December?

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

What to wear in San Diego in December?

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

Is December peak season in San Diego?

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

San Diego Weather in December