Climate of Los Angeles
Temperatures and seasons
► See or edit raw graph data. 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.
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