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 average high-temperature is a still moderately hot 82.6°F (28.1°C) in September, hardly different from the 83.7°F (28.7°C) recorded in August. An average low-temperature of 64.4°F (18°C) is common in Walnut Park during the nights of September.Heat index
The heat index value for September is appraised at 84.2°F (29°C). Long-standing exposure and activity could induce a feeling of tiredness and lead to heat cramps.Bear in mind that the heat index values are determined for shaded areas and light breezes. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
Humidity
The average relative humidity in September is 57%.Rainfall
In September, the rain falls for 2.5 days. Throughout September, 0.16" (4mm) of precipitation is accumulated. In Walnut Park, during the entire year, the rain falls for 43.2 days and collects up to 6.46" (164mm) of precipitation.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September, sunrise is at 6:27 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:37 pm PDT.
Sunshine
In September, the average sunshine is 10.6h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 6 during September translates into the following directions:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What is the average humidity in September in Walnut Park?
How many days does it rain in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Walnut Park have in September?
What are the months with the highest UV index?
What is the UV index reading in September?
Average temperature in September
Walnut Park, CA
- Average high temperature in September: 82.6°F
The warmest month (with the highest average high temperature) is August (83.7°F).
The month with the lowest average high temperature is December (64.6°F).
- Average low temperature in September: 64.4°F
The month with the highest average low temperature is August (65.1°F).
The coldest month (with the lowest average low temperature) is February (50°F).
Average pressure in September
Walnut Park, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.89"Hg).
Average wind speed in September
Walnut Park, CA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is October (4.7mph).
Average humidity in September
Walnut Park, CA
- Average humidity in September: 57%
The month with the highest relative humidity is June (65%).
The month with the lowest relative humidity is November (50%).
Average rainfall in September
Walnut Park, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is February (1.34").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Walnut Park, CA
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is March (5.9 days).
The month with the least rainy days is June (1.3 days).
Average daylight in September /
Average sunshine in September
Walnut Park, 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 February and December (Average sunshine: 6h and 42min).
Average sunshine days in September
Walnut Park, CA
- Average sunshine days in September: 24.5 days
The month with the most sunshine days is August (26.8 days).
The month with the least sunshine days is February (21.8 days).
Average UV index in September
Walnut Park, 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 January, February, November and December (UV index 4).
Average cloud cover in September
Walnut Park, 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
Walnut Park, 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).
Walnut Park, California, USA
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