September weather forecastSaint Johns, AZ
September
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 12h and 24min
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 42min
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: 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: 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: 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: 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).
