September weather forecastCasa Grande, AZ
September
Weather in September
September in Casa Grande signals a gradual conclusion of the summer season, with a reassuring fall in temperatures. This month witnesses a relative increase in rainfall, a pattern that continues on to October. However, the percentage of cloud cover remains nearly unchanged at 11% compared to August's 13%. It offers a respite from the summer peak, with temperatures dipping to a high of 95.9°F (35.5°C) from the 101.1°F (38.4°C) observed in August. As September rolls into October, it brings along with it a discernible change in weather patterns, welcoming the autumn season.Temperature
The transition into September shows a subtle variation to a still torrid 95.9°F (35.5°C) from August's 101.1°F (38.4°C) in the average high-temperature. Casa Grande, in September, witnesses an average low-temperature of 77.2°F (25.1°C).Humidity
In Casa Grande, the average relative humidity in September is 33%.Rainfall
In Casa Grande, during September, the rain falls for 7.5 days and regularly aggregates up to 0.91" (23mm) of precipitation. Throughout the year, there are 59.1 rainfall days, and 7.36" (187mm) of precipitation is accumulated.Daylight
In Casa Grande, the average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:02 am and sunset at 6:51 pm. On the last day of September, sunrise is at 6:21 am and sunset at 6:12 pm MST.
Sunshine
In September, the average sunshine is 9.7h.UV index
In September, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The average daily UV index of 7 in September transforms into the following instructions:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Casa Grande, AZ
- Average high temperature in September: 95.9°F
The warmest month (with the highest average high temperature) is July (102°F).
The month with the lowest average high temperature is December (62.6°F).
- Average low temperature in September: 77.2°F
The month with the highest average low temperature is August (82.9°F).
The coldest month (with the lowest average low temperature) is January (46.4°F).
Average pressure in September
Casa Grande, AZ
- Average pressure in September: 29.86"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.81"Hg).
Average wind speed in September
Casa Grande, AZ
- Average wind speed in September: 5.5mph
The windiest months (with the highest average wind speed) are April and May (7.1mph).
The calmest months (with the lowest average wind speed) are January and December (4.9mph).
Average humidity in September
Casa Grande, AZ
- Average humidity in September: 33%
The month with the highest relative humidity is December (45%).
The month with the lowest relative humidity is June (16%).
Average rainfall in September
Casa Grande, AZ
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is July (1.02").
The driest month (with the least rainfall) is June (0.12").
Average rainfall days in September
Casa Grande, AZ
- Average rainfall days in September: 7.5 days
The month with the highest number of rainy days is July (10.7 days).
The month with the least rainy days is June (1.8 days).
Average daylight in September /
Average sunshine in September
Casa Grande, AZ
- Average daylight in September: 12h and 24min
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 0min).
- Average sunshine in September: 9h and 42min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in September
Casa Grande, AZ
- Average sunshine days in September: 19.5 days
The month with the most sunshine days is May (28.4 days).
The month with the least sunshine days is July (15.4 days).
Average UV index in September
Casa Grande, AZ
- Average UV index in September: 7
The months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Casa Grande, 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 6).
Average visibility in September
Casa Grande, 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).
