San Juan Weather in October

The climate in San Juan during October can be summarized as hot, humid and reasonably dry.

October is in the fall / autumn in San Juan and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a muggy 30°C (86°F), whilst at night 19°C (66°F) is normal.

On average October is the 4th wettest month of the year in San Juan with around 60mm 2.4 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.1 hours of sunshine per day.

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 Juan in October 2025.