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 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
The arrival of September signals a subtle shift in temperature, down from a scorching 105.8°F (41°C) in August to a very hot 99.7°F (37.6°C). Throughout the month of September, the nighttime temperature in San Luis dips to an average of 80.6°F (27°C).Humidity
In September, the average relative humidity in San Luis is 30%.Rainfall
In September, the rain falls for 3.3 days. Throughout September, 0.24" (6mm) of precipitation is accumulated. Throughout the year, in San Luis, there are 25 rainfall days, and 2.24" (57mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 21min.On the first day of the month, sunrise is at 6:14 am and sunset at 7:03 pm. On the last day of September, in San Luis, sunrise is at 6:33 am and sunset at 6:24 pm MST.
Sunshine
In September, the average sunshine in San Luis is 9.8h.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 8. A UV Index of 8 to 10 symbolizes a very high health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 8 during September translates into the following directions:
Always take safety measures. The skin and eyes are at risk if left exposed. 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. 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 San Luis in September?
What is the average humidity in September in San Luis?
How many days does it rain in September in San Luis?
How many hours of daylight does San Luis have in September?
What time are sunrise and sunset in September in San Luis?
How long on average sun shines in September in San Luis?
What is the month with the highest UV index in San Luis?
How high is the UV index in September in San Luis?
Average temperature in September
San Luis, AZ
- Average high temperature in September: 99.7°F
The warmest month (with the highest average high temperature) is July (106.2°F).
The month with the lowest average high temperature is December (67.1°F).
- Average low temperature in September: 80.6°F
The month with the highest average low temperature is August (86.2°F).
The coldest month (with the lowest average low temperature) is December (50.5°F).
Average pressure in September
San Luis, AZ
- Average pressure in September: 29.79"Hg
The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.75"Hg).
Average wind speed in September
San Luis, AZ
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is July (8.5mph).
The calmest month (with the lowest average wind speed) is November (6.7mph).
Average humidity in September
San Luis, AZ
- Average humidity in September: 30%
The month with the highest relative humidity is December (38%).
The month with the lowest relative humidity is June (23%).
Average rainfall in September
San Luis, AZ
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is July (0.39").
The driest month (with the least rainfall) is May (0").
Average rainfall days in September
San Luis, AZ
- Average rainfall days in September: 3.3 days
The month with the highest number of rainy days is July (5.1 days).
The month with the least rainy days is May (0.3 days).
Average daylight in September /
Average sunshine in September
San Luis, AZ
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 9h and 5min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 7h and 6min).
Average sunshine days in September
San Luis, AZ
- Average sunshine days in September: 26.1 days
The month with the most sunshine days is May (30.4 days).
The month with the least sunshine days is July (24.3 days).
Average UV index in September
San Luis, AZ
- Average UV index in September: 8
The months with the highest UV index are June, July, August and September (UV index 8).
The month with the lowest UV index is December (UV index 4).
Average cloud cover in September
San Luis, AZ
- Average cloud cover in September: 8
The month with the most cloud cover is December (Cloud cover 18).
The month with the least cloud cover is June (Cloud cover 5).
Average visibility in September
San Luis, AZ
- 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 Luis, Arizona, USA
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