Long Beach (CA) Temperature by Month

Long Beach, California, United States of America has an average annual maximum temperature of 23°C (73°F), with moderate seasonal shifts ranging from 19°C (66°F) in December to 28°C (82°F) in September. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

In Long Beach, seasonal changes bring about a moderate variation in temperatures. Nighttime lows range from 18°C (64°F) in September to 9°C (48°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Long Beach by month:

The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. September, the city's warmest month, averages 278 hours of sunshine.

The chart below shows the average temperature throughout the year:

Long Beach's average annual maximum temperature is 23°C (73°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Long Beach, December is the coolest month, with average highs of 19°C (66°F) and humidity around 52%, considered moderate. In September, the warmest month, temperatures average 28°C (82°F) with 67% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.

Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.

For more on Long Beach's weather, including monthly rainfall, sunshine hours, and humidity, visit our Long Beach climate page.