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
Collinsville's September weather features a light decline in high-temperatures, reducing from a tropical 90.1°F (32.3°C) in August to a warm 83.1°F (28.4°C). During the nights in September, Collinsville experiences a consistent average temperature of 63.5°F (17.5°C).Heat index
The heat index value during September is estimated at a hot 89.6°F (32°C). If exposure and activity are sustained, they might cause a feeling of weariness, resulting in heat cramps.The heat index's values are generally associated with conditions in shade and light breezes. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', takes into account both air temperature and humidity to illustrate what people actually feel. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly relevant to children. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
Humidity
The average relative humidity in September is 71%.Rainfall
In September, in Collinsville, Oklahoma, the rain falls for 11.5 days. Throughout September, 3.39" (86mm) of precipitation is accumulated. Throughout the year, there are 132.6 rainfall days, and 29.69" (754mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 24min.On the first day of September, sunrise is at 6:55 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:07 pm CDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum UV index of 5 in September translates into the following recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Collinsville have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Collinsville, OK
- Average high temperature in September: 83.1°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (45.9°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).
Average pressure in September
Collinsville, OK
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Collinsville, OK
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is March (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Collinsville, OK
- Average humidity in September: 71%
The month with the highest relative humidity is May (80%).
The months with the lowest relative humidity are January, August and October (68%).
Average rainfall in September
Collinsville, OK
- Average rainfall in September: 3.39"
The wettest month (with the highest rainfall) is May (5.28").
The driest month (with the least rainfall) is January (1.22").
Average rainfall days in September
Collinsville, OK
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (6.1 days).
Average snowfall in September
Collinsville, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.46").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Collinsville, OK
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (2.2 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
Collinsville, OK
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in September
Collinsville, OK
- Average sunshine days in September: 16.1 days
The months with the most sunshine days are January and December (21.9 days).
The month with the least sunshine days is May (13.5 days).
Average UV index in September
Collinsville, 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
Collinsville, OK
- Average cloud cover in September: 27
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 21).
Average visibility in September
Collinsville, 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).
Collinsville, Oklahoma, USA
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