San Luis Obispo Weather in August

What's the weather like in San Luis Obispo (California) in August 2025?

The climate in San Luis Obispo during August can be summarized as warm and very dry.

August is in the summer in San Luis Obispo and is typically the warmest month of the year. Daytime maximum temperatures average around 26°C (79°F), whilst at night 12°C (54°F) is normal.

San Luis Obispo weather averages (imperial / metric)
Daytime temperature	26.2°C 79.1°F
Nightly temperature	12.1°C 53.7°F
Average temperature	19.1°C 66.4°F
Daily sunshine	10.5 hrs
Avg rainfall	3 mm 0.1 ins
Rainy days	1 days
Sea temperature	16.8°C 62.2°F
Humidity	73%
Windspeed	11.9kph 7 mph

On average August is the 3rd driest month of the year in San Luis Obispo with around 3mm 0.1 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 10.5 hours of sunshine per day.

August temperatures in San Luis Obispo

San Luis Obispo average temperature in August

August rainfall

August hourly sunshine

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Luis Obispo in August 2025.

Other monthly averages

Best places to visit in August

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

San Luis Obispo weather stats

San Luis Obispo weather statistics
Hottest month:	August	25.8°C 78.4°F
Driest month:	June	2mm 0.1ins
Sunniest month:	April	11hrs
Coldest month:	January	15.7°C 60.3°F
Wettest month:	January	100mm 3.9ins

Map showing location of San Luis Obispo (35.28275, -120.65962)