September weather forecast
Temecula, CA

September in Temecula presents a significant shift from the fierce summer to the cooler autumn season. Comparatively lower temperatures, especially in the nights, offer a refreshing break from the previous hot summer months. An increase in the cloud cover, creates a play of light and shadow under the autumn sky. Though September is drier compared to the upcoming October, it experiences a sudden increase in rainfall after the drier August. With the arrival of fall, residents witness a beautiful transformation in the weather offering a pleasant reprieve to all.

Temperature

Temecula experiences a transition to a warm 85.1°F (29.5°C) in average high-temperatures with the arrival of September, not greatly differing from August's 87.4°F (30.8°C). A noticeable downturn in temperature characterizes the September nights in Temecula, averaging at a moderate 60.4°F (15.8°C).

Heat index

The average heat index in September is evaluated at a hot 87.8°F (31°C). If one stays active during extended exposure, it might induce fatigue and result in heat cramps.
Consider that heat index readings are for situations in the shade and light wind. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.

Humidity

The average relative humidity in September in Temecula, California, is 54%.

Rainfall

In Temecula, in September, it is raining for 4.1 days, with typically 0.28" (7mm) of accumulated precipitation. In Temecula, during the entire year, the rain falls for 60.6 days and collects up to 9.37" (238mm) of precipitation.

Daylight

In Temecula, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:23 am and sunset at 7:13 pm. On the last day of September, in Temecula, California, sunrise is at 6:42 am and sunset at 6:33 pm PDT.

Sunshine

In Temecula, California, the average sunshine in September is 10.5h.

UV index

The average daily maximum UV index in September in Temecula, California, is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.
Note: In September, the maximum UV index of 5 transforms into these recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.