Overview: Pismo BeachPismo Beach (United States of America) in general has a hot climate. The day temperatures range from 18 °C (64 °F) in January to 24 °C (75 °F) in September. Sea temperatures are in the following range: 12 °C (54 °F) in April to 15 °C (60 °F) in September. The least rainy month in Pismo Beach is July with its 1 day of rain, the rainiest month is February, when it rains 9 days. Temperatures during the night go from 6 °C (42 °F) in January to 12 °C (53 °F) in July.