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 transition into September subtly indicates a reduction in the average high-temperature, down to a moderately hot 83.7°F (28.7°C) from August's tropical 90.5°F (32.5°C). Delaware documents a substantial deviation from daytime highs with a consistent low-temperature of 61.7°F (16.5°C) during September nights.Heat index
The heat index in September is calculated to be a hot 91.4°F (33°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.Factoring in the heat index, values are geared towards shaded areas with light breezes. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
Humidity
In September, the average relative humidity in Delaware is 74%.Rainfall
In Delaware, during September, the rain falls for 13.3 days and regularly aggregates up to 2.4" (61mm) of precipitation. Throughout the year, there are 156 rainfall days, and 37.56" (954mm) of precipitation is accumulated.Snowfall
April through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 23min.On the first day of the month, sunrise is at 6:46 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:07 am and sunset at 6:58 pm CDT.
Sunshine
In September, the average sunshine in Delaware is 9.4h.UV index
In Delaware, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 6 during September translates into the following directions:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Delaware in September?
What is the average humidity in September in Delaware?
How much does it rain in Delaware in September?
When it does not snow in Delaware?
What is the average length of the day in September in Delaware?
What time are sunrise and sunset in September in Delaware?
How many hours of sunshine does Delaware have in September?
What is the UV index intensity in September in Delaware?
Average temperature in September
Delaware, AR
- Average high temperature in September: 83.7°F
The warmest month (with the highest average high temperature) is July (91.8°F).
The month with the lowest average high temperature is January (47.5°F).
- Average low temperature in September: 61.7°F
The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).
Average pressure in September
Delaware, AR
- 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 (29.94"Hg).
Average wind speed in September
Delaware, AR
- Average wind speed in September: 4.4mph
The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest months (with the lowest average wind speed) are July and August (4.2mph).
Average humidity in September
Delaware, AR
- Average humidity in September: 74%
The months with the highest relative humidity are March and May (79%).
The months with the lowest relative humidity are July, August and October (73%).
Average rainfall in September
Delaware, AR
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is May (4.84").
The driest month (with the least rainfall) is January (2.32").
Average rainfall days in September
Delaware, AR
- Average rainfall days in September: 13.3 days
The months with the highest number of rainy days are May and July (16.3 days).
The month with the least rainy days is January (9.7 days).
Average snowfall in September
Delaware, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.83").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Delaware, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Delaware, AR
- 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 July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 5h and 24min).
Average sunshine days in September
Delaware, AR
- Average sunshine days in September: 15 days
The month with the most sunshine days is December (19.2 days).
The month with the least sunshine days is July (12.7 days).
Average UV index in September
Delaware, AR
- Average UV index in September: 6
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Delaware, AR
- Average cloud cover in September: 29
The months with the most cloud cover are February and March (Cloud cover 45).
The months with the least cloud cover are June, July and August (Cloud cover 27).
Average visibility in September
Delaware, AR
- Average visibility in September: 6mi
The months with the highest visibility are February, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, March, April, May and December (5mi).
Delaware, Arkansas, USA
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