September weather forecastBethel, DE
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Bethel, Delaware, with an average temperature ranging between max 76.6°F (24.8°C) and min 62.8°F (17.1°C).Temperature
September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's warm 82.6°F (28.1°C) to a still moderately hot 76.6°F (24.8°C). Bethel records an average low of 62.8°F (17.1°C) throughout the nights in September.Humidity
May, August and September, with an average relative humidity of 80%, are the most humid months in Bethel.Rainfall
September is the month with the least rainfall. Rain falls for 7.7 days and accumulates 0.39" (10mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In Bethel, Delaware, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:32 pm. On the last day of September, in Bethel, sunrise is at 6:58 am and sunset at 6:46 pm EDT.
Sunshine
The average sunshine in September is 9.2h.UV index
The average daily maximum UV index in September in Bethel is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 suggests this advice:
Undertake precautions - Guarding against sun damage is counselled. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bethel, DE
- Average high temperature in September: 76.6°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (41.5°F).
- Average low temperature in September: 62.8°F
The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (29.1°F).
Average pressure in September
Bethel, DE
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Bethel, DE
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is February (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in September
Bethel, DE
- Average humidity in September: 80%
The months with the highest relative humidity are May, August and September (80%).
The month with the lowest relative humidity is January (74%).
Average rainfall in September
Bethel, DE
- Average rainfall in September: 0.39"
The wettest months (with the highest rainfall) are July and August (1.06").
The driest month (with the least rainfall) is September (0.39").
Average rainfall days in September
Bethel, DE
- Average rainfall days in September: 7.7 days
The month with the highest number of rainy days is July (12 days).
The month with the least rainy days is November (4.9 days).
Average snowfall in September
Bethel, DE
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.35").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Bethel, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2 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
Bethel, DE
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in September
Bethel, DE
- Average sunshine days in September: 19.6 days
The month with the most sunshine days is November (23.9 days).
The month with the least sunshine days is July (15.7 days).
Average UV index in September
Bethel, DE
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Bethel, DE
- Average cloud cover in September: 34
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Bethel, DE
- 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).
