September weather forecastSierra Vista, CA
September
Weather in September
September, the first month of the autumn in Sierra Vista, is still a tropical month, with temperature in the range of an average high of 92.1°F (33.4°C) and an average low of 62.6°F (17°C).Temperature
A modest decline in the average high-temperature is seen during September, decreasing from a torrid 98.2°F (36.8°C) in August to a hot 92.1°F (33.4°C). Sierra Vista records a consistent low-temperature average of 62.6°F (17°C) during September, indicating a significant difference from the daytime heat.Humidity
The average relative humidity in September is 34%.Rainfall
In Sierra Vista, during September, the rain falls for 1.5 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Sierra Vista, during the entire year, the rain falls for 51 days and collects up to 7.56" (192mm) of precipitation.Daylight
The average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:45 pm PDT.
Sunshine
In September, the average sunshine is 11.4h.UV index
In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 6 during September translates into the following directions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sierra Vista, CA
- Average high temperature in September: 92.1°F
The warmest month (with the highest average high temperature) is July (100°F).
The month with the lowest average high temperature is December (56.3°F).
- Average low temperature in September: 62.6°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).
Average pressure in September
Sierra Vista, CA
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Sierra Vista, CA
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is June (7.9mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).
Average humidity in September
Sierra Vista, CA
- Average humidity in September: 34%
The month with the highest relative humidity is January (68%).
The month with the lowest relative humidity is July (31%).
Average rainfall in September
Sierra Vista, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is March (1.46").
The driest month (with the least rainfall) is August (0.04").
Average rainfall days in September
Sierra Vista, CA
- Average rainfall days in September: 1.5 days
The month with the highest number of rainy days is March (8.6 days).
The month with the least rainy days is June (0.8 days).
Average daylight in September /
Average sunshine in September
Sierra Vista, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 11h and 24min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 12min).
Average sunshine days in September
Sierra Vista, CA
- Average sunshine days in September: 27.2 days
The month with the most sunshine days is June (28.8 days).
The month with the least sunshine days is February (21.5 days).
Average UV index in September
Sierra Vista, CA
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Sierra Vista, CA
- Average cloud cover in September: 5
The months with the most cloud cover are March and December (Cloud cover 30).
The months with the least cloud cover are July, August and September (Cloud cover 5).
Average visibility in September
Sierra 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).
