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

Depending on the time of the year, temperatures range from very warm to pleasant in Pasadena. Average maximum daytime temperatures range from a very warm 33°C (91°F) in August, the warmest time of the year, to a pleasant 20°C (68°F) during cooler months like December.

At night, you can expect temperatures ranging from 18°C (64°F) in August to around 8°C (46°F) during December.

Check out our detailed temperature page for more information.

Temperature ranges by month

With annual rainfall averaging 388 mm (15 in), Pasadena maintains relatively low precipitation levels throughout the seasons. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives moderate rainfall, averaging 93 mm (3.7 in) of precipitation, recorded across 8 rainy days. In contrast, the driest month August brings less rainfall, with 0.4 mm (0.02 in) over 0 rainy days. For more details, please visit our Pasadena Precipitation page.

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

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Pasadena. While July receives considerable daily sunshine with up to 12.1 hours, November marks the darkest time of the year, where sunshine is scarce with only 7.2 hours of sunlight per 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 Pasadena.

The city experiences its highest humidity in May, reaching 73%. In November, the humidity drops to its lowest level at 50%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year