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
September registers an average high-temperature of a moderately hot 84.4°F (29.1°C), slightly varied from August's 87.1°F (30.6°C). In September, East Pasadena experiences an average nighttime temperature of 63.3°F (17.4°C).Heat index
In September, the average heat index is estimated at a hot 86°F (30°C). Continuous activity in exposure could lead to a feeling of fatigue and heat cramps.It is crucial to understand that heat index figures are for shade and gentle wind conditions. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'feels like', embodies the combination of air temperature and moisture content to illustrate perceived heat. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular significance for children. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
Humidity
The average relative humidity in September is 50%.Rainfall
In East Pasadena, in September, during 2.6 rainfall days, 0.16" (4mm) of precipitation is typically accumulated. In East Pasadena, during the entire year, the rain falls for 50.1 days and collects up to 8.5" (216mm) of precipitation.Daylight
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 East Pasadena, sunrise is at 6:46 am and sunset at 6:37 pm PDT.
Sunshine
In East Pasadena, the average sunshine in September is 10.8h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index in East Pasadena. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.Note: A maximum daily UV index of 6 during September morphs into the following directions:
Take precautions against overexposure. Protection against sun damage is needed. 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. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Frequently asked questions
How hot does it get in East Pasadena in September?
What is the average humidity in September in East Pasadena?
How much does it rain in East Pasadena in September?
What is the average length of the day in September in East Pasadena?
What time are sunrise and sunset in September in East Pasadena?
How long on average sun shines in September in East Pasadena?
What are the months with the highest UV index in East Pasadena?
What is the UV index intensity in September in East Pasadena?
Average temperature in September
East Pasadena, CA
- Average high temperature in September: 84.4°F
The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is December (61.7°F).
- Average low temperature in September: 63.3°F
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (46.6°F).
Average pressure in September
East Pasadena, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
East Pasadena, 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
East Pasadena, CA
- Average humidity in September: 50%
The month with the highest relative humidity is June (58%).
The month with the lowest relative humidity is November (47%).
Average rainfall in September
East Pasadena, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
East Pasadena, CA
- Average rainfall days in September: 2.6 days
The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.1 days).
Average daylight in September /
Average sunshine in September
East Pasadena, 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 months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).
Average sunshine days in September
East Pasadena, CA
- Average sunshine days in September: 25.2 days
The month with the most sunshine days is June (27.5 days).
The month with the least sunshine days is February (21.5 days).
Average UV index in September
East Pasadena, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
East Pasadena, 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
East Pasadena, 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).
East Pasadena, California, USA
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