Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The arrival of September records an average high-temperature of a moderately hot 85.8°F (29.9°C), closely related to the 87.6°F (30.9°C) observed in August. Throughout September, Hacienda Heights anticipates an average low-temperature of 64.6°F (18.1°C).Heat index
September's mean heat index is estimated at a hot 87.8°F (31°C). With constant exposure and activity, a state of weariness might ensue, leading to potential heat cramps.Understanding the heat index involves considering values for shaded locales with light wind. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', gives a temperature feeling by integrating air temperature and humidity. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
Humidity
The average relative humidity in September in Hacienda Heights, California, is 51%.Rainfall
In Hacienda Heights, during September, the rain falls for 2.5 days and regularly aggregates up to 0.08" (2mm) of precipitation. Throughout the year, there are 40.9 rainfall days, and 6.3" (160mm) of precipitation is accumulated.Daylight
In Hacienda Heights, 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 7:17 pm. On the last day of September, in Hacienda Heights, sunrise is at 6:46 am and sunset at 6:36 pm PDT.
Sunshine
The average sunshine in September in Hacienda Heights is 10.6h.UV index
The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 6 suggests this advice:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Frequently asked questions
How hot does it get in Hacienda Heights in September?
What is the average humidity in September in Hacienda Heights?
How many days does it rain in September in Hacienda Heights?
What is the average length of the day in September in Hacienda Heights?
When is the sunrise / sunset in September in Hacienda Heights?
How long on average sun shines in September in Hacienda Heights?
How high is the UV index in September in Hacienda Heights?
Average temperature in September
Hacienda Heights, CA
- Average high temperature in September: 85.8°F
The warmest month (with the highest average high temperature) is August (87.6°F).
The month with the lowest average high temperature is December (64.9°F).
- Average low temperature in September: 64.6°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (49.3°F).
Average pressure in September
Hacienda Heights, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Hacienda Heights, CA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is April (5.9mph).
The calmest months (with the lowest average wind speed) are September and October (4.7mph).
Average humidity in September
Hacienda Heights, CA
- Average humidity in September: 51%
The month with the highest relative humidity is June (60%).
The month with the lowest relative humidity is November (47%).
Average rainfall in September
Hacienda Heights, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is December (1.46").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in September
Hacienda Heights, CA
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is March (5.8 days).
The month with the least rainy days is June (1.2 days).
Average daylight in September /
Average sunshine in September
Hacienda Heights, CA
- Average daylight in September: 12h and 2min
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 4min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).
Average sunshine days in September
Hacienda Heights, CA
- Average sunshine days in September: 26.3 days
The month with the most sunshine days is August (28.6 days).
The month with the least sunshine days is February (22.6 days).
Average UV index in September
Hacienda Heights, CA
- Average UV index in September: 6
The month with the highest UV index is August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in September
Hacienda Heights, CA
- Average cloud cover in September: 9
The months with the most cloud cover are February, March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
Hacienda Heights, 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).
Hacienda Heights, California, USA
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