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 marks a slight shift to an average high-temperature of a still moderately hot 84.4°F (29.1°C) from August's 85.8°F (29.9°C). Pico Rivera experiences an average low-temperature reading of 64.9°F (18.3°C) throughout September.Heat index
For September, the heat index is estimated at a tropical 86°F (30°C). Ongoing activity coupled with exposure often results in weariness and could induce heat cramps.Heat index specifics point out values are for conditions of shade and a slight breeze. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Humidity
In Pico Rivera, California, the average relative humidity in September is 54%.Rainfall
In Pico Rivera, in September, during 2.4 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. Throughout the year, in Pico Rivera, there are 40.2 rainfall days, and 6.22" (158mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September in Pico Rivera, sunrise is at 6:26 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:37 pm PDT.
Sunshine
The average sunshine in September is 10.6h.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 6 during September translates into the following guidance:
Ward off overexposure. Defence against solar harm is crucial. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in Pico Rivera in September?
What is the average humidity in September in Pico Rivera?
How much does it rain in Pico Rivera in September?
What is the average length of the day in September in Pico Rivera?
When is the sunrise / sunset in September in Pico Rivera?
How long on average sun shines in September in Pico Rivera?
What is the month with the highest UV index in Pico Rivera?
How high is the UV index in September in Pico Rivera?
Average temperature in September
Pico Rivera, CA
- Average high temperature in September: 84.4°F
The warmest month (with the highest average high temperature) is August (85.8°F).
The month with the lowest average high temperature is December (64.9°F).
- Average low temperature in September: 64.9°F
The month with the highest average low temperature is August (66°F).
The coldest month (with the lowest average low temperature) is February (50°F).
Average pressure in September
Pico Rivera, 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
Pico Rivera, CA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is April (6mph).
The calmest months (with the lowest average wind speed) are September and October (4.7mph).
Average humidity in September
Pico Rivera, CA
- Average humidity in September: 54%
The month with the highest relative humidity is June (63%).
The month with the lowest relative humidity is November (48%).
Average rainfall in September
Pico Rivera, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is December (1.3").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Pico Rivera, CA
- Average rainfall days in September: 2.4 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 days).
Average daylight in September /
Average sunshine in September
Pico Rivera, 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 months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).
Average sunshine days in September
Pico Rivera, CA
- Average sunshine days in September: 25.2 days
The month with the most sunshine days is August (27 days).
The month with the least sunshine days is February (22.6 days).
Average UV index in September
Pico Rivera, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are February, November and December (UV index 4).
Average cloud cover in September
Pico Rivera, CA
- Average cloud cover in September: 9
The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in September
Pico Rivera, 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).
Pico Rivera, California, USA
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