page_title: Climate of Los Angeles
section_title: Summer
hierarchical_section_title: Climate of Los Angeles / Temperatures and seasons / Summer
caption_attribution_description: English: "June Gloom" meteorological conditions prevailing at the beach in Seal Beach, California, in late morning in June 2013
context_page_description: The climate of Los Angeles is a year-round mild-to-hot and mostly dry climate for the LA metropolitan area in California. The climate is classified as a Mediterranean climate, which is a type of dry subtropical climate. It is characterized by seasonal changes in rainfall—with a dry summer and a winter rainy season. Under the modified Köppen climate classification, the coastal areas are classified as Csb, and the inland areas as Csa.
  The Los Angeles area contains microclimates, where daytime temperatures can vary as much as 36 °F between inland areas such as the San Fernando Valley or San Gabriel Valley, and the coastal Los Angeles Basin.
context_section_description: Summers are warm to hot, and nearly completely dry. The summer temperature pattern usually begins in late June or early July, and lasts through September or October, although it may start as early as  late May. In August, the average high/low at the University of Southern California downtown campus are 84.8 °F (29.3 °C) and 65.6 °F (18.7 °C). The same figures at the LAX airport, approximately 12 miles (19 km) to the southwest and near the ocean, are 76.6 °F (24.8 °C) and 64.2 °F (17.9 °C). However, temperatures across the region often exceed 90 °F (32 °C) during the summer. This happens when an atmospheric high-pressure area becomes dominant over the Great Basin of Nevada and Utah (a frequent occurrence), and the resulting offshore flow of the atmospheric air mass shuts off the normal coastal sea breeze in Los Angeles. July, August and September are the hottest months, with September holding the all-time record of 113 °F (45 °C). Skies are nearly constantly sunny, unless interrupted in late spring and early summer by the June Gloom pattern, which is unpredictable year-to-year. The North American Monsoon can bring occasional thunderstorms and high humidity to Los Angeles in the summer and early fall.
caption: Typical June Gloom conditions in late morning at Seal Beach, June 2013.
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