September weather forecast and climate
San Luis, AZ

Weather in September

The first month of the autumn, September, is still a torrid month in San Luis, Arizona, with temperature in the range of an average low of 80.6°F (27°C) and an average high of 99.7°F (37.6°C).

Temperature

In September, the average high-temperature marginally drops, from a blistering 105.8°F (41°C) in August, to a sweltering 99.7°F (37.6°C). In September, in San Luis, the average low-temperature is 80.6°F (27°C).

Humidity

In September, the average relative humidity in San Luis, Arizona, is 30%.

Rainfall

In September, the rain falls for 3.3 days. Throughout September, 0.24" (6mm) of precipitation is accumulated. In San Luis, Arizona, during the entire year, the rain falls for 25 days and collects up to 2.24" (57mm) of precipitation.

Daylight

In September, the average length of the day in San Luis is 12.4h.

Sunshine

The average sunshine in San Luis is 9.8h.

UV index

Months with the highest UV index are June through September, with an average maximum UV index of 8. A UV Index estimate of 8 to 10 represents a very high threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 8 translate into the following recommendations:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in San Luis?

In San Luis, in September, the average high-temperature is 99.7°F (37.6°C), and the average low-temperature is 80.6°F (27°C).

What is the average humidity in September in San Luis?

In San Luis, Arizona, the average relative humidity in September is 30%.

How much does it rain in San Luis in September?

In September, the rain falls for 3.3 days. Throughout September, 0.24" (6mm) of precipitation is accumulated.

What is the average length of the day in September in San Luis?

In San Luis, the average length of the day in September is 12.4h.

How long on average sun shines in September in San Luis?

In September, the average sunshine in San Luis, Arizona, is 9.8h.

When is the highest UV index in San Luis?

Months with the highest UV index in San Luis, Arizona, are June through September, with an average maximum UV index of 8.

What is the UV index intensity in September in San Luis?

The average daily maximum UV index in September in San Luis is 8. A UV Index estimate of 8 to 10 represents a very high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
San Luis, AZ

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).

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Average pressure in September
San Luis, AZ

Average pressure in September - San Luis, AZ
  • Average pressure in September: 29.79"

The month with the highest atmospheric pressure is January (30.07").
The month with the lowest atmospheric pressure is June (29.75").

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Average wind speed in September
San Luis, AZ

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).

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Average humidity in September
San Luis, AZ

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%).

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Average rainfall in September
San Luis, AZ

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").

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Average rainfall days in September
San Luis, AZ

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).

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Average daylight in September /
Average sunshine in September
San Luis, AZ

Average daylight in September / Average sunshine in September - San Luis, AZ
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 9.8h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 7.1h).

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Average sunshine days in September
San Luis, AZ

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).

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Average UV index in September
San Luis, AZ

Average UV index in September - San Luis, AZ
  • Average UV index in September: 8

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).

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Average cloud cover in September
San Luis, AZ

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).

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Average visibility in September
San Luis, AZ

Average visibility in September - San Luis, AZ
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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