San Luis Obispo Weather in December

December in San Luis Obispo averages 17°C (63°F) during the day and 5°C (41°F) at night. It is the wettest month of the year, with 98 mm (3.9 in) of rainfall on average, so waterproof gear is a must.

Rainfall in San Luis Obispo in December

It's the month with the heaviest rainfall, so an umbrella is a must to navigate the wet weather. Typically around 10 days of rainfall are expected, averaging 98 mm (3.9 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in San Luis Obispo in December

In December, expect moderate temperatures in San Luis Obispo, with highs of 17°C (63°F) and lows of 5°C (41°F) at night. During December, you'll experience the winter season. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights drop to 5°C (41°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet. Experience mild yet warm temperatures during this month, offering a comfortable climate.

Sunshine in San Luis Obispo in December

Expect a lot of sunshine this month, with about 220 hours of sun. These sunny conditions add to the overall experience.

December in San Luis Obispo can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.