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 snowfall in September
- Average snowfall 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
September marks a gentle change in average high-temperature, declining from August's hot 92.3°F (33.5°C) to a moderately hot 85.1°F (29.5°C). The nighttime average for Rock Island in September plummets considerably from its daytime counterpart, resting at a comfortable 63°F (17.2°C).Heat index
September's average heat index is calculated to be a tropical 93.2°F (34°C). Take more caution, heat exhaustion and heat cramps may occur. Long-lasting activity may cause heatstroke.When referencing the heat index, its values are suitable for shady environments and light breezes. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
Humidity
In Rock Island, Oklahoma, the average relative humidity in September is 70%.Rainfall
In Rock Island, Oklahoma, in September, it is raining for 12.3 days, with typically 2.68" (68mm) of accumulated precipitation. Throughout the year, there are 149.7 rainfall days, and 35.08" (891mm) of precipitation is accumulated.Snowfall
In Rock Island, Oklahoma, snow does not fall in April through October.Daylight
In September, the average length of the day in Rock Island is 12h and 23min.On the first day of September, sunrise is at 6:51 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:02 pm CDT.
Sunshine
In September, the average sunshine in Rock Island is 9.5h.UV index
The average daily maximum UV index in September in Rock Island is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: A daily maximum UV index of 5 in September translates into the following instructions:
Take necessary precautions - Defending against sun damage is advocated. To guard against the harmful effects of the Sun, minimize exposure during midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Frequently asked questions
How hot is it in Rock Island in September?
What is the average humidity in September in Rock Island?
How many days does it rain in September in Rock Island?
When it does not snow in Rock Island?
What is the average length of the day in September in Rock Island?
When is the sunrise / sunset in September in Rock Island?
How many hours of sunshine does Rock Island have in September?
What is the UV index reading in September in Rock Island?
Average temperature in September
Rock Island, OK
- Average high temperature in September: 85.1°F
The warmest month (with the highest average high temperature) is July (93.4°F).
The month with the lowest average high temperature is January (48°F).
- Average low temperature in September: 63°F
The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (31.6°F).
Average pressure in September
Rock Island, OK
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Rock Island, OK
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Rock Island, OK
- Average humidity in September: 70%
The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is August (69%).
Average rainfall in September
Rock Island, OK
- Average rainfall in September: 2.68"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in September
Rock Island, OK
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is March (15.4 days).
The month with the least rainy days is November (8.8 days).
Average snowfall in September
Rock Island, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.06").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Rock Island, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Rock Island, OK
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 9h and 3min
The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).
Average sunshine days in September
Rock Island, OK
- Average sunshine days in September: 16.4 days
The months with the most sunshine days are November and December (19.3 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in September
Rock Island, OK
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Rock Island, OK
- Average cloud cover in September: 26
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility in September
Rock Island, OK
- 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).
Rock Island, Oklahoma, USA
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