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
Vista's shift into September is marked by a subtle change to a still warm 79.9°F (26.6°C) from August's 81.1°F (27.3°C) in temperature. Throughout September, the average low-temperature dips to an enjoyable 63.5°F (17.5°C).Humidity
In Vista, the average relative humidity in September is 64%.Rainfall
In Vista, in September, during 3.9 rainfall days, 0.28" (7mm) of precipitation is typically accumulated. In Vista, during the entire year, the rain falls for 62.9 days and collects up to 9.17" (233mm) of precipitation.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September, sunrise is at 6:23 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:34 pm PDT.
Sunshine
The average sunshine in September is 10.5h.UV index
In September, the average daily maximum UV index in Vista is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How many days does it rain in September?
How many hours of daylight does Vista have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Vista have in September?
What is the UV index reading in September?
Average temperature in September
Vista, CA
- Average high temperature in September: 79.9°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (62.6°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is August (63.9°F).
The coldest month (with the lowest average low temperature) is February (48.4°F).
Average pressure in September
Vista, CA
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Vista, CA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is October (4.5mph).
Average humidity in September
Vista, CA
- Average humidity in September: 64%
The month with the highest relative humidity is May (70%).
The month with the lowest relative humidity is November (57%).
Average rainfall in September
Vista, CA
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is December (1.85").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Vista, CA
- Average rainfall days in September: 3.9 days
The month with the highest number of rainy days is March (8.3 days).
The month with the least rainy days is June (1.6 days).
Average daylight in September /
Average sunshine in September
Vista, 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 42min).
Average sunshine days in September
Vista, CA
- Average sunshine days in September: 23.5 days
The month with the most sunshine days is October (24.6 days).
The month with the least sunshine days is February (19.7 days).
Average UV index in September
Vista, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (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
Vista, CA
- Average cloud cover in September: 10
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 7).
Average visibility in September
Vista, 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).
Vista, California, USA
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