Climate
San Luis Obispo weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: June, August, September, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Wet days |
|---|---|---|---|---|
| January | 65°F | 41°F | 3.9 in | 8 |
| February | 65°F | 42°F | 3.5 in | 10 |
| March | 67°F | 45°F | 3.2 in | 9 |
| April | 69°F | 46°F | 1.1 in | 6 |
| May | 72°F | 48°F | 0.50 in | 3 |
| June | 75°F | 51°F | 0.10 in | 1 |
| July | 78°F | 54°F | 0.10 in | 0 |
| August | 79°F | 55°F | 0.00 in | 1 |
| September | 80°F | 53°F | 0.00 in | 1 |
| October | 77°F | 50°F | 0.90 in | 4 |
| November | 71°F | 45°F | 1.4 in | 6 |
| December | 65°F | 40°F | 3.3 in | 9 |
NOAA U.S. Climate Normals 1991–2020, San Luis Obispo Ap, Ca Us (2.8 mi away, 200 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in San Luis Obispo?
September, with an average high of 80°F and low of 53°F.
What is the coldest month in San Luis Obispo?
December, with an average low of 40°F and high of 65°F.
When does it rain most in San Luis Obispo?
January is the wettest month, averaging 3.9 in of precipitation; the year totals about 18.0 inches.
What is the best time to visit San Luis Obispo?
For mild weather (highs between 65°F and 85°F) with the least rain, June, August, September.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the San Luis Obispo Ap weather station, 2.8 miles from downtown: 30-year averages, not a forecast.