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 snowfall 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
With the onset of September, the average high-temperature stands at a warm 85.6°F (29.8°C), closely aligned with August's 88°F (31.1°C). Azusa encounters a significant temperature differential, with an average low-temperature of 63.1°F (17.3°C) during September nights.Heat index
For most parts of September, the heat index is computed to be a hot 86°F (30°C). Ongoing exposure and activity could lead to a state of exhaustion, with a chance of heat cramps.It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
Humidity
The average relative humidity in September is 47%.Rainfall
In Azusa, during September, the rain falls for 2.3 days and regularly aggregates up to 0.12" (3mm) of precipitation. Throughout the year, there are 50.5 rainfall days, and 8.35" (212mm) of precipitation is accumulated.Snowfall
In Azusa, snow does not fall in January, March through December.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 7:17 pm. On the last day of September, sunrise is at 6:46 am and sunset at 6:36 pm PDT.
Sunshine
In Azusa, the average sunshine in September is 10.8h.UV index
In September, the average daily maximum UV index is 6. 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: A daily high UV index of 6 in September leads to these guidelines:
Resist extreme sun exposure. Guarding against solar damage is essential. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Azusa have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Azusa have in September?
What is the UV index intensity in September?
Average temperature in September
Azusa, CA
- Average high temperature in September: 85.6°F
The warmest month (with the highest average high temperature) is August (88°F).
The month with the lowest average high temperature is December (61.7°F).
- Average low temperature in September: 63.1°F
The month with the highest average low temperature is August (65.5°F).
The coldest month (with the lowest average low temperature) is December (45.9°F).
Average pressure in September
Azusa, CA
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Azusa, 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
Azusa, CA
- Average humidity in September: 47%
The month with the highest relative humidity is May (56%).
The month with the lowest relative humidity is November (45%).
Average rainfall in September
Azusa, CA
- Average rainfall in September: 0.12"
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
Azusa, CA
- Average rainfall days in September: 2.3 days
The month with the highest number of rainy days is March (7 days).
The month with the least rainy days is June (1.3 days).
Average snowfall days in September
Azusa, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Azusa, 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
Azusa, CA
- Average sunshine days in September: 26.2 days
The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (21.3 days).
Average UV index in September
Azusa, 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
Azusa, CA
- Average cloud cover in September: 6
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 5).
Average visibility in September
Azusa, 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).
Azusa, California, USA
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