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
As August makes way for September, Barstow's average high-temperature eases from a very hot 97.2°F (36.2°C) to a hot 89.2°F (31.8°C). In September, the temperature drops to an average of 70.9°F (21.6°C) at night.Heat index
For September, the heat index is evaluated at a hot 91.4°F (33°C). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.Heat index readings emphasize conditions of light breezes and shaded spots. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is the outcome of merging air's temperature and its humidity metrics. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Humidity
In September, the average relative humidity is 46%.Rainfall
September is the month with the most rainfall in Barstow. Rain falls for 9.6 days and accumulates 1.22" (31mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 21min.On the first day of September, sunrise is at 7:29 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 7:47 am and sunset at 7:39 pm CDT.
Sunshine
In Barstow, the average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average UV index of 6 in September transforms into this advice:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September?
What is the rainiest month?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Barstow have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Barstow, TX
- Average high temperature in September: 89.2°F
The warmest month (with the highest average high temperature) is June (98.4°F).
The months with the lowest average high temperature are January and December (59.9°F).
- Average low temperature in September: 70.9°F
The month with the highest average low temperature is July (78.4°F).
The coldest month (with the lowest average low temperature) is January (39.9°F).
Average pressure in September
Barstow, TX
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in September
Barstow, TX
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is June (11.4mph).
The calmest month (with the lowest average wind speed) is November (8mph).
Average humidity in September
Barstow, TX
- Average humidity in September: 46%
The month with the highest relative humidity is December (47%).
The month with the lowest relative humidity is April (26%).
Average rainfall in September
Barstow, TX
- Average rainfall in September: 1.22"
The wettest month (with the highest rainfall) is September (1.22").
The driest month (with the least rainfall) is February (0.16").
Average rainfall days in September
Barstow, TX
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is September (9.6 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in September
Barstow, TX
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.75").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Barstow, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (1.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Barstow, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).
Average sunshine days in September
Barstow, TX
- Average sunshine days in September: 18 days
The month with the most sunshine days is January (27.2 days).
The month with the least sunshine days is September (18 days).
Average UV index in September
Barstow, TX
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 8).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Barstow, TX
- Average cloud cover in September: 20
The months with the most cloud cover are September and December (Cloud cover 20).
The month with the least cloud cover is June (Cloud cover 11).
Average visibility in September
Barstow, 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).
Barstow, Texas, USA
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