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's arrival comes with a mild decrease in the average high-temperature, moving subtly from a hot 91.4°F (33°C) in August to a warm 85.5°F (29.7°C). Brownsville's temperature exhibits a stark contrast from daytime to nighttime, averaging lows of 59°F (15°C) in September.Humidity
In Brownsville, the average relative humidity in September is 36%.Rainfall
In Brownsville, during September, the rain falls for 2.8 days and regularly aggregates up to 0.43" (11mm) of precipitation. Throughout the year, there are 88.4 rainfall days, and 30.35" (771mm) of precipitation is accumulated.Snowfall
January, March through October are months without snowfall.Daylight
In Brownsville, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of September, in Brownsville, sunrise is at 7:01 am and sunset at 6:48 pm PDT.
Sunshine
The average sunshine in September in Brownsville, California, is 11.2h.UV index
The average daily maximum UV index in September in Brownsville is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The UV index of 5 during September translates into the following guidance:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Frequently asked questions
How hot does it get in Brownsville in September?
What is the average humidity in September in Brownsville?
How much does it rain in Brownsville in September?
When it does not snow in Brownsville?
What is the average length of the day in September in Brownsville?
When are sunrise and sunset in September in Brownsville?
How long on average sun shines in September in Brownsville?
How high is the UV index in September in Brownsville?
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 2min
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 1min
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).
Brownsville, California, USA
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