September weather forecast
Saint Johns, AZ

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Weather in September

The first month of the autumn, September, is still a warm month in Saint Johns, Arizona, with temperature in the range of an average low of 59.2°F (15.1°C) and an average high of 79.5°F (26.4°C).

Temperature

September's advent notes a subtle adjustment in average high-temperature to a still warm 79.5°F (26.4°C) from August. The mean low-temperature during September nights is a moderate 59.2°F (15.1°C).

Humidity

In Saint Johns, Arizona, the average relative humidity in September is 39%.

Rainfall

In Saint Johns, in September, it is raining for 6.4 days, with typically 0.55" (14mm) of accumulated precipitation. In Saint Johns, during the entire year, the rain falls for 67.8 days and collects up to 6.34" (161mm) of precipitation.

Snowfall

In Saint Johns, snow does not fall in May through October.

Daylight

In Saint Johns, the average length of the day in September is 12h and 23min.
On the first day of September, sunrise is at 5:51 am and sunset at 6:43 pm. On the last day of the month, sunrise is at 6:11 am and sunset at 6:02 pm MST.

Sunshine

In Saint Johns, the average sunshine in September is 10.7h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: A typical high UV index of 5 in September suggests the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Updated: Aug 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The high-temperature in Saint Johns during September is 79.5°F (26.4°C) and the low-temperature is 59.2°F (15.1°C).

What is the average humidity in September?

In September, the average relative humidity is 39%.

How much does it rain in September?

In Saint Johns, in September, it is raining for 6.4 days, with typically 0.55" (14mm) of accumulated precipitation.

When it does not snow?

In Saint Johns, snow does not fall in May through October.

How many hours of daylight does Saint Johns have in September?

In Saint Johns, the average day length in September is 12h and 23min.

When are sunrise and sunset in September in Saint Johns?

On the first day of September, sunrise is at 5:51 am and sunset at 6:43 pm. On the last day of the month, sunrise is at 6:11 am and sunset at 6:02 pm MST.

How many hours of sunshine does Saint Johns have in September?

In September, the average sunshine duration is 10.7h.

What is the UV index intensity in September?

In Saint Johns, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Saint Johns, AZ

Average temperature in September - Saint Johns, AZ
  • Average high temperature in September: 79.5°F

The warmest months (with the highest average high temperature) are June and July (86.5°F).
The month with the lowest average high temperature is January (45.5°F).

  • Average low temperature in September: 59.2°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (28.2°F).

Average pressure in September
Saint Johns, AZ

Average pressure in September - Saint Johns, AZ
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in September
Saint Johns, AZ

Average wind speed in September - Saint Johns, AZ
  • Average wind speed in September: 7.4mph

The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is January (6.2mph).

Average humidity in September
Saint Johns, AZ

Average humidity in September - Saint Johns, AZ
  • Average humidity in September: 39%

The month with the highest relative humidity is January (61%).
The month with the lowest relative humidity is June (21%).

Average rainfall in September
Saint Johns, AZ

Average rainfall in September - Saint Johns, AZ
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is July (0.83").
The driest months (with the least rainfall) are May and June (0.28").

Average rainfall days in September
Saint Johns, AZ

Average rainfall days in September - Saint Johns, AZ
  • Average rainfall days in September: 6.4 days

The month with the highest number of rainy days is July (10.2 days).
The month with the least rainy days is November (2.9 days).

Average snowfall in September
Saint Johns, AZ

Average snowfall in September - Saint Johns, AZ
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.44").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Saint Johns, AZ

Average snowfall days in September - Saint Johns, AZ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (4.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Saint Johns, AZ

Average daylight in September / Average sunshine in September - Saint Johns, AZ
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 10h and 4min

The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).

Average sunshine days in September
Saint Johns, AZ

Average sunshine days in September - Saint Johns, AZ
  • Average sunshine days in September: 22 days

The month with the most sunshine days is June (25.8 days).
The month with the least sunshine days is July (17.4 days).

Average UV index in September
Saint Johns, AZ

Average UV index in September - Saint Johns, AZ
  • Average UV index in September: 5

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, November and December (UV index 2).

Average cloud cover in September
Saint Johns, AZ

Average cloud cover in September - Saint Johns, AZ
  • Average cloud cover in September: 11

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is June (Cloud cover 9).

Average visibility in September
Saint Johns, AZ

Average visibility in September - Saint Johns, 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).

Saint Johns, Arizona, USA

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