September weather forecastBrownsville, CA
September
Weather in September
The first month of the autumn, September, is still a warm month in Brownsville, California, with temperature in the range of an average low of 59°F (15°C) and an average high of 85.5°F (29.7°C).Temperature
Brownsville's transition into September involves a gentle shift in temperature, receding from a tropical 91.4°F (33°C) in August to a warm 85.5°F (29.7°C). Brownsville undergoes a major shift from daytime highs, averaging a mild 59°F (15°C) during the night in September.Humidity
In September, the average relative humidity is 36%.Rainfall
In September, the rain falls for 2.8 days. Throughout September, 0.43" (11mm) of precipitation is accumulated. Throughout the year, there are 88.4 rainfall days, and 30.35" (771mm) of precipitation is accumulated.Snowfall
In Brownsville, snow does not fall in January, March through October.Daylight
In Brownsville, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:48 pm PDT.
Sunshine
The average sunshine in September is 11.2h.UV index
In Brownsville, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Take precautions - Protection against sunburn is recommended. When the Sun is at its strongest around midday, find shade and limit exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Brownsville, CA
- Average high temperature in September: 85.5°F
The warmest month (with the highest average high temperature) is July (92.5°F).
The month with the lowest average high temperature is December (52.5°F).
- Average low temperature in September: 59°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is December (38.1°F).
Average pressure in September
Brownsville, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Brownsville, CA
- Average wind speed in September: 5.7mph
The windiest months (with the highest average wind speed) are February, March and April (6.2mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in September
Brownsville, CA
- Average humidity in September: 36%
The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are July and August (34%).
Average rainfall in September
Brownsville, CA
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is March (6.02").
The driest month (with the least rainfall) is July (0.04").
Average rainfall days in September
Brownsville, CA
- Average rainfall days in September: 2.8 days
The month with the highest number of rainy days is March (15.5 days).
The month with the least rainy days is July (1.4 days).
Average snowfall in September
Brownsville, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.43").
The months with the least snowfall are January, March, April, May, June, July, August, September and October (0").
Average snowfall days in September
Brownsville, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.6 days).
The months with the least snowfall days are January, April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Brownsville, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 12min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Brownsville, CA
- Average sunshine days in September: 25.9 days
The month with the most sunshine days is July (28.3 days).
The month with the least sunshine days is March (14.5 days).
Average UV index in September
Brownsville, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Brownsville, CA
- Average cloud cover in September: 9
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Brownsville, 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).
