Long Beach sits on the Pacific coast of southern California, at the southern edge of the Los Angeles basin on San Pedro Bay at approximately 33.77°N, 118.19°W. Cooled by the California Current, it has a semi-arid Mediterranean climate (Köppen BSk/Csb) — mild and dry year-round — with abundant sunshine and very little rain.

Summer, from June to September, is warm and dry rather than hot, with August the warmest month — average highs around 27–28°C — tempered by the cool ocean and the sea breeze, though inland districts run hotter. Rain is essentially absent, and morning marine layer cloud often veils the coast before burning off to sunshine by midday.

Winter, from December to February, is mild and the wetter season, with January the coolest month — average highs around 20°C and cool nights near 9–10°C, with frost effectively unknown. Pacific storms bring most of the year's modest rain, though long sunny spells dominate between the fronts.

Long Beach is very dry, receiving only around 300 mm of rain a year — semi-arid levels — almost all of it between December and March, while the summer is essentially rainless; the cold California Current suppresses rainfall and feeds the marine layer. Live rainfall, humidity, and pressure readings for the city are shown in the panels above.

Long Beach shares the Los Angeles basin's mild, sunny, semi-arid climate, moderated by the Pacific. Its most dramatic weather is the Santa Ana wind, which reverses the usual onshore flow, sweeping hot, bone-dry desert air toward the coast, sending temperatures soaring in autumn and driving the region's most dangerous wildfires.

To follow any single measurement in Long Beach more closely, use our live instruments: the online barometer for atmospheric pressure, the thermometer for temperature, the hygrometer for humidity, the anemometer for wind speed, the wind vane for wind direction, and the rain gauge for rainfall.