September weather forecastLa Cañada Flintridge, CA
September
Weather in September
September, the first month of the autumn in La Cañada Flintridge, is still a warm month, with an average temperature ranging between max 84.6°F (29.2°C) and min 62.6°F (17°C).Temperature
With the start of September, La Cañada Flintridge measures an average high-temperature of a moderately hot 84.6°F (29.2°C), not significantly differing from August's 86.2°F (30.1°C). La Cañada Flintridge anticipates a considerable drop in temperature at night in September, with an average low of 62.6°F (17°C).Heat index
Throughout September, the heat index is calculated to be a tropical 86°F (30°C). With ongoing exposure and activity, one might experience weariness, and heat cramps could ensue.Heat index readings emphasize conditions of light breezes and shaded spots. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
Humidity
In September, the average relative humidity is 49%.Rainfall
In La Cañada Flintridge, during September, the rain falls for 3 days and regularly aggregates up to 0.16" (4mm) of precipitation. Throughout the year, there are 52 rainfall days, and 8.82" (224mm) of precipitation is accumulated.Daylight
In La Cañada Flintridge, the average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:18 pm. On the last day of September, in La Cañada Flintridge, California, sunrise is at 6:47 am and sunset at 6:37 pm PDT.
Sunshine
In September, the average sunshine is 10.8h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 6 during September leads to these advisories:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
La Cañada Flintridge, CA
- Average high temperature in September: 84.6°F
The warmest month (with the highest average high temperature) is August (86.2°F).
The month with the lowest average high temperature is December (61°F).
- Average low temperature in September: 62.6°F
The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).
Average pressure in September
La Cañada Flintridge, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
La Cañada Flintridge, CA
- Average wind speed in September: 4.4mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in September
La Cañada Flintridge, CA
- Average humidity in September: 49%
The months with the highest relative humidity are March, May and June (56%).
The month with the lowest relative humidity is November (46%).
Average rainfall in September
La Cañada Flintridge, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is February (1.81").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
La Cañada Flintridge, CA
- Average rainfall days in September: 3 days
The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.3 days).
Average daylight in September /
Average sunshine in September
La Cañada Flintridge, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 10h and 48min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).
Average sunshine days in September
La Cañada Flintridge, CA
- Average sunshine days in September: 25.6 days
The month with the most sunshine days is June (27.2 days).
The month with the least sunshine days is February (21.3 days).
Average UV index in September
La Cañada Flintridge, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
La Cañada Flintridge, CA
- Average cloud cover in September: 6
The month with the most cloud cover is March (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
La Cañada Flintridge, CA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
