The temperatures in San Luis Obispo in December are quite cold with temperatures between 44°F and 60°F, warm clothes are a must.
You can expect about 3 to 8 days of rain in San Luis Obispo during the month of December. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in San Luis Obispo in December 2025.
If you’re planning to visit San Luis Obispo in the near future, we highly recommend that you review the 14 day weather forecast for San Luis Obispo before you arrive.
Temperatures
60° / 44°
Rainy Days
3
Snowy Days
0
Dry Days
28
Rainfall
2.56
in
Sun Hours
8.8
Hrs
