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
Covina greets September with an average high-temperature of a still tropical 86.5°F (30.3°C), marking a slight deviation from the preceding month. Covina's September nights cool down significantly from the day's heat, to an average low-temperature of 63.5°F (17.5°C).Heat index
The heat index in September is evaluated at a hot 87.8°F (31°C). Continued exposure and engagement in activity might trigger tiredness and subsequently heat cramps.Records show heat index calculations are tailored for shaded regions and mild winds. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
Humidity
In September, the average relative humidity is 48%.Rainfall
In Covina, California, in September, it is raining for 2.7 days, with typically 0.12" (3mm) of accumulated precipitation. Throughout the year, in Covina, California, there are 47.3 rainfall days, and 6.93" (176mm) of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:16 pm. On the last day of September, in Covina, sunrise is at 6:45 am and sunset at 6:36 pm PDT.
Sunshine
In September, the average sunshine in Covina is 10.8h.UV index
In September, the average daily maximum UV index in Covina is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily maximum UV index of 6 in September interprets into the following advice:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Frequently asked questions
How hot is it in Covina in September?
What is the average humidity in September in Covina?
How many days does it rain in September in Covina?
How many hours of daylight does Covina have in September?
When are sunrise and sunset in September in Covina?
How long on average sun shines in September in Covina?
What is the UV index intensity in September in Covina?
Average temperature in September
Covina, CA
- Average high temperature in September: 86.5°F
The warmest month (with the highest average high temperature) is August (89.1°F).
The month with the lowest average high temperature is December (63.1°F).
- Average low temperature in September: 63.5°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 (46.4°F).
Average pressure in September
Covina, CA
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Covina, CA
- Average wind speed in September: 4.4mph
The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in September
Covina, CA
- Average humidity in September: 48%
The month with the highest relative humidity is May (56%).
The month with the lowest relative humidity is November (45%).
Average rainfall in September
Covina, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is December (1.5").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Covina, CA
- Average rainfall days in September: 2.7 days
The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (1.3 days).
Average daylight in September /
Average sunshine in September
Covina, 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 5min
The month with the most sunshine is 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
Covina, CA
- Average sunshine days in September: 25.4 days
The month with the most sunshine days is June (28 days).
The month with the least sunshine days is February (22 days).
Average UV index in September
Covina, CA
- Average UV index in September: 6
The month with the highest UV index is August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Covina, CA
- Average cloud cover in September: 7
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in September
Covina, 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).
Covina, California, USA
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