Altadena
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Altadena, CA

September, the first month of the autumn, in Altadena, is also a hot month, with average temperature fluctuating between 60.6°F (15.9°C) and 88.5°F (31.4°C).

Temperature

In Altadena, the average high-temperature in September is almost the same as in August - a still tropical 88.5°F (31.4°C). In Altadena, the average low-temperature is 60.6°F (15.9°C).

Rainfall

In September, the rain falls for 1.7 days. Throughout the year, in Altadena, there are 43.8 rainfall days.

Daylight

In September, the average length of the day in Altadena is 12.4h.

What is the temperature in September in Altadena?

In Altadena, California, in September, the average high-temperature is 88.5°F (31.4°C), and the average low-temperature is 60.6°F (15.9°C).

How many days does it rain in September in Altadena?

In September, in Altadena, the rain falls for 1.7 days.

How many hours of daylight does Altadena have in September?

The average length of the day in September in Altadena is 12.4h.
Average temperature in September - Altadena, CA
  • Average high temperature in September: 88.5°F

The warmest month (with the highest average high temperature) is August (90.6°F).
The month with the lowest average high temperature is January (67.8°F).

  • Average low temperature in September: 60.6°F

The month with the highest average low temperature is August (62°F).
The coldest month (with the lowest average low temperature) is December (44.1°F).

Average rainfall days in September - Altadena, CA
  • Average rainfall days in September: 1.7 days

The month with the highest number of rainy days is March (7.7 days).
The month with the lowest number of rainy days is July (0.5 days).

Average daylight in September - Altadena, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).