Pittsburg (CA) Weather & Climate: Best Time to Visit

The climate in Pittsburg is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a very warm 32°C (90°F) in July to a moderate 13°C (55°F) in January.

Nighttime temperatures range from 15°C (59°F) in July to 5°C (41°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Pittsburg has a relatively dry climate with low precipitation, averaging 344 mm (14 in) of rainfall annually. The seasons in Pittsburg bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 71 mm (2.8 in) of precipitation. This rainfall is distributed across 12 rainy days.

In contrast, the driest month, July, experiences much less rainfall, totaling 0 mm (0 in) over 0 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Pittsburg Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

In Pittsburg, summer days are longer and more sunny, with daily sunshine hours peaking at 10.8 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 5.3 hours per average day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Pittsburg.

The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year