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
As September takes its course, Tustin's average high-temperature registers at a still warm 79.7°F (26.5°C), closely aligning with the preceding month. September nights are marked by an average low-temperature of 64.4°F (18°C).Humidity
In Tustin, the average relative humidity in September is 63%.Rainfall
In Tustin, during September, the rain falls for 3.1 days and regularly aggregates up to 0.16" (4mm) of precipitation. Throughout the year, there are 51.9 rainfall days, and 4.13" (105mm) of precipitation is accumulated.Daylight
The average length of the day in September in Tustin 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, sunrise is at 6:45 am and sunset at 6:36 pm PDT.
Sunshine
In Tustin, the average sunshine in September is 10.6h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index in Tustin. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.Note: In September, a daily UV index of 6 turns into the following recommendations:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. 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 wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Tustin?
What is the average humidity in September in Tustin?
How many days does it rain in September in Tustin?
What is the average length of the day in September in Tustin?
What time are sunrise and sunset in September in Tustin?
How many hours of sunshine does Tustin have in September?
What are the months with the highest UV index in Tustin?
What is the UV index intensity in September in Tustin?
Average temperature in September
Tustin, CA
- Average high temperature in September: 79.7°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 (63.1°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 (50.7°F).
Average pressure in September
Tustin, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Tustin, CA
- Average wind speed in September: 4.8mph
The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest months (with the lowest average wind speed) are August, September and October (4.8mph).
Average humidity in September
Tustin, CA
- Average humidity in September: 63%
The month with the highest relative humidity is June (70%).
The month with the lowest relative humidity is November (55%).
Average rainfall in September
Tustin, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is December (0.87").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Tustin, CA
- Average rainfall days in September: 3.1 days
The month with the highest number of rainy days is March (6.7 days).
The month with the least rainy days is June (1.3 days).
Average daylight in September /
Average sunshine in September
Tustin, 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: 10h and 0min).
- Average sunshine in September: 10h and 4min
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 42min).
Average sunshine days in September
Tustin, CA
- Average sunshine days in September: 24.1 days
The month with the most sunshine days is June (26.9 days).
The month with the least sunshine days is February (20.3 days).
Average UV index in September
Tustin, 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
Tustin, CA
- Average cloud cover in September: 9
The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in September
Tustin, 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).
Tustin, California, USA
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