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
Aliso Viejo, California, marks the arrival of September with an average high-temperature of a still warm 79.5°F (26.4°C), hardly different from August's 80.2°F (26.8°C). Nighttime temperatures in Aliso Viejo hover around an average low of 63.5°F (17.5°C) in September.Humidity
In September, the average relative humidity in Aliso Viejo is 64%.Rainfall
In Aliso Viejo, in September, it is raining for 4.6 days, with typically 0.28" (7mm) of accumulated precipitation. In Aliso Viejo, during the entire year, the rain falls for 66.3 days and collects up to 5.67" (144mm) of precipitation.Daylight
In Aliso Viejo, California, 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 7:15 pm. On the last day of September, in Aliso Viejo, California, sunrise is at 6:45 am and sunset at 6:36 pm PDT.
Sunshine
The average sunshine in September is 10.5h.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 risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, a daily UV index of 6 turns into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
What is the usual temperature for Aliso Viejo in September?
What is the average humidity in September in Aliso Viejo?
How much does it rain in Aliso Viejo in September?
What is the average length of the day in September in Aliso Viejo?
When is the sunrise / sunset in September in Aliso Viejo?
How long on average sun shines in September in Aliso Viejo?
What are the months with the highest UV index in Aliso Viejo?
How high is the UV index in September in Aliso Viejo?
Average temperature in September
Aliso Viejo, CA
- Average high temperature in September: 79.5°F
The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (62.8°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is February (49.6°F).
Average pressure in September
Aliso Viejo, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Aliso Viejo, CA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is April (5.9mph).
The calmest months (with the lowest average wind speed) are August, September and October (4.7mph).
Average humidity in September
Aliso Viejo, CA
- Average humidity in September: 64%
The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (56%).
Average rainfall in September
Aliso Viejo, CA
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is December (0.87").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Aliso Viejo, CA
- Average rainfall days in September: 4.6 days
The month with the highest number of rainy days is March (8.3 days).
The month with the least rainy days is June (2.6 days).
Average daylight in September /
Average sunshine in September
Aliso Viejo, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 3min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in September
Aliso Viejo, CA
- Average sunshine days in September: 21.7 days
The month with the most sunshine days is January (24.1 days).
The month with the least sunshine days is February (19.6 days).
Average UV index in September
Aliso Viejo, 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, March, November and December (UV index 4).
Average cloud cover in September
Aliso Viejo, CA
- Average cloud cover in September: 11
The months with the most cloud cover are March and December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in September
Aliso Viejo, 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).
Aliso Viejo, California, USA
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