San Luis Obispo (CA) Weather & Climate: Best Time to Visit

In San Luis Obispo, seasonal changes bring about a moderate variation in temperatures. Typically, average maximum daytime temperatures range from a comfortable 28°C (82°F) in September to a moderate 17°C (63°F) in the coolest month, December.

Nights vary from 12°C (54°F) in September to around 5°C (41°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

With annual rainfall averaging 426 mm (17 in), San Luis Obispo maintains relatively low precipitation levels throughout the seasons. The climate in San Luis Obispo shows significant variation throughout the year. Expect moderate rainfall in December, the wettest month, with an average of 98 mm (3.9 in) of precipitation over 10 rainy days.

In contrast, the driest month August offers drier and sunnier days, with around 0.4 mm (0.02 in) of rainfall over 0 rainy days. For more details, please visit our San Luis Obispo Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

For those who appreciate different seasons, San Luis Obispo serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 11.7 hours of sunshine daily, and embrace the darker days in January, offering only 6.9 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine