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 beginning of September subtly marks a decrease in the average high-temperature, transitioning from a moderately hot 82.9°F (28.3°C) in August to a still warm 77°F (25°C). Middletown witnesses a consistent average low-temperature of 61°F (16.1°C) throughout September.Humidity
The months with the highest humidity in Middletown are May, June and September, with an average relative humidity of 78%.Rainfall
In Middletown, in September, during 10.7 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. In Middletown, during the entire year, the rain falls for 134.6 days and collects up to 21.14" (537mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:31 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:46 pm EDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In Middletown, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 5 in September translates into this advice:
Take precautions - Protection against sunburn is recommended. The solar radiation around mid-day is intense; avoid the Sun and stay safe. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Middletown in September?
What is the most humid month?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow in Middletown?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Middletown have in September?
What is the UV index reading in September?
Average temperature in September
Middletown, DE
- Average high temperature in September: 77°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (38.7°F).
- Average low temperature in September: 61°F
The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).
Average pressure in September
Middletown, DE
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Middletown, DE
- Average wind speed in September: 6.2mph
The windiest months (with the highest average wind speed) are February and March (9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Middletown, DE
- Average humidity in September: 78%
The months with the highest relative humidity are May, June and September (78%).
The month with the lowest relative humidity is April (72%).
Average rainfall in September
Middletown, DE
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is August (2.72").
The driest month (with the least rainfall) is January (1.26").
Average rainfall days in September
Middletown, DE
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.4 days).
Average snowfall in September
Middletown, DE
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Middletown, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.5 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
Middletown, DE
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Middletown, DE
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in September
Middletown, 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, February, November and December (UV index 2).
Average cloud cover in September
Middletown, DE
- Average cloud cover in September: 36
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Middletown, 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).
Middletown, Delaware, USA
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