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
The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from a hot 91°F (32.8°C) to a warm 84°F (28.9°C). Keys records an average low of 63.1°F (17.3°C) throughout the nights in September.Heat index
In September, the heat index is computed to be a tropical 91.4°F (33°C). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.Bear in mind that the heat index values are determined for shaded areas and light breezes. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is achieved by amalgamating air temperature with the relative humidity readings. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Humidity
The average relative humidity in September is 71%.Rainfall
In Keys, during September, the rain falls for 9.4 days and regularly aggregates up to 0.94" (24mm) of precipitation. In Keys, during the entire year, the rain falls for 96.8 days and collects up to 10.79" (274mm) of precipitation.Snowfall
In Keys, snow does not fall in April through October and December.Daylight
The average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:52 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:04 pm CDT.
Sunshine
In Keys, the average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 5 suggests this advice:
Adopt protective measures - Suggestions to resist sunburn are offered. Minimize direct exposure to the Sun during midday when its radiation is at its peak. 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 does it get in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Keys, OK
- Average high temperature in September: 84°F
The warmest month (with the highest average high temperature) is July (91.9°F).
The month with the lowest average high temperature is January (46.8°F).
- Average low temperature in September: 63.1°F
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (31.5°F).
Average pressure in September
Keys, OK
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Keys, OK
- Average wind speed in September: 6.3mph
The windiest months (with the highest average wind speed) are March and April (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in September
Keys, OK
- Average humidity in September: 71%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is August (69%).
Average rainfall in September
Keys, OK
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is May (1.42").
The driest months (with the least rainfall) are February, November and December (0.51").
Average rainfall days in September
Keys, OK
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is May (12 days).
The month with the least rainy days is January (4.6 days).
Average snowfall in September
Keys, OK
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.12").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in September
Keys, 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 and September (0 days).
Average daylight in September /
Average sunshine in September
Keys, 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 2min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Keys, OK
- Average sunshine days in September: 19.2 days
The month with the most sunshine days is January (24.8 days).
The month with the least sunshine days is May (15.6 days).
Average UV index in September
Keys, OK
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Keys, OK
- Average cloud cover in September: 27
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in September
Keys, 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).
Keys, Oklahoma, USA
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