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 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
September sees a slight reduction in average high-temperature, with a shift from a very hot 97.9°F (36.6°C) in August to a tropical 90.5°F (32.5°C). The low-temperature average for San Diego during September stands at a moderately hot 74.8°F (23.8°C).Heat index
In September, the average heat index is calculated to be a blisteringly hot 105.8°F (41°C). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.Bear in mind that the heat index values are determined for shaded areas and light breezes. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', blends air temperature and moisture content to represent the felt temperature to humans. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.
Humidity
The average relative humidity in September in San Diego is 68%.Rainfall
September is the month with the most rainfall in San Diego. Rain falls for 17.1 days and accumulates 2.52" (64mm) of precipitation.Snowfall
March through November are months without snowfall.Daylight
The average length of the day in September in San Diego is 12h and 19min.On the first day of the month, sunrise is at 7:12 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:25 am and sunset at 7:19 pm CDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index in San Diego is 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for average individuals.Note: A daily high UV index of 7 in September leads to these guidelines:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in San Diego in September?
What is the average humidity in September in San Diego?
What is the rainiest month in San Diego?
How much does it rain in San Diego in September?
When it does not snow in San Diego?
How many hours of daylight does San Diego have in September?
When is the sunrise / sunset in September in San Diego?
How long on average sun shines in September in San Diego?
What is the UV index reading in September in San Diego?
Average temperature in September
San Diego, TX
- Average high temperature in September: 90.5°F
The warmest month (with the highest average high temperature) is August (97.9°F).
The month with the lowest average high temperature is January (65.5°F).
- Average low temperature in September: 74.8°F
The month with the highest average low temperature is August (77.2°F).
The coldest month (with the lowest average low temperature) is January (48.7°F).
Average pressure in September
San Diego, TX
- Average pressure in September: 29.91"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are May and June (29.87"Hg).
Average wind speed in September
San Diego, TX
- Average wind speed in September: 8.2mph
The windiest month (with the highest average wind speed) is May (11.2mph).
The calmest month (with the lowest average wind speed) is September (8.2mph).
Average humidity in September
San Diego, TX
- Average humidity in September: 68%
The month with the highest relative humidity is May (72%).
The month with the lowest relative humidity is August (62%).
Average rainfall in September
San Diego, TX
- Average rainfall in September: 2.52"
The wettest month (with the highest rainfall) is September (2.52").
The driest month (with the least rainfall) is February (0.59").
Average rainfall days in September
San Diego, TX
- Average rainfall days in September: 17.1 days
The month with the highest number of rainy days is September (17.1 days).
The month with the least rainy days is January (7 days).
Average snowfall in September
San Diego, TX
- Average snowfall in September: 0"
The months with the highest snowfall are January, February and December (0.04").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
San Diego, TX
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.2 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
San Diego, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in September
San Diego, TX
- Average sunshine days in September: 11.2 days
The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is September (11.2 days).
Average UV index in September
San Diego, TX
- Average UV index in September: 7
The month with the highest UV index is July (UV index 8).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover in September
San Diego, TX
- Average cloud cover in September: 31
The months with the most cloud cover are February and December (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 19).
Average visibility in September
San Diego, TX
- 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).
San Diego, Texas, USA
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