September weather forecastMilton, DE
September
Weather in September
The arrival of September signals the transition from summer to fall in Milton, Delaware, bringing a marked shift in weather patterns. The cooling trend begins under a canopy of Fall colors in the city. The majority of precipitation occurs in liquid form as the month records a small amount of rainfall at 0.63" (16mm), the least throughout the year. Daylight hours dwindle further but enough light for outdoor activities still persists. The decrease in wind speed to 7.1mph (11.4km/h) makes it the calmest month of the year.Temperature
September brings a minor shift in the average high-temperature, adjusting from 81.1°F (27.3°C) in August to a still moderately hot 75.7°F (24.3°C). In September, the nighttime temperature lowers to an average of 65.3°F (18.5°C).Humidity
In Milton, the average relative humidity in September is 79%.Rainfall
September is the month with the least rainfall. Rain falls for 10.8 days and accumulates 0.63" (16mm) of precipitation.Snowfall
April, June through October are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:45 pm EDT.
Sunshine
The average sunshine in September is 9.5h.UV index
In Milton, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 5 translates into these guidelines:
Ensure safety - Imperative it is to shield skin and eyes from damage. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Milton, DE
- Average high temperature in September: 75.7°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (41°F).
- Average low temperature in September: 65.3°F
The month with the highest average low temperature is July (71.4°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in September
Milton, 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
Milton, DE
- Average wind speed in September: 8.5mph
The windiest months (with the highest average wind speed) are January and February (10.8mph).
The calmest month (with the lowest average wind speed) is August (7.1mph).
Average humidity in September
Milton, DE
- Average humidity in September: 79%
The month with the highest relative humidity is May (80%).
The months with the lowest relative humidity are January and November (74%).
Average rainfall in September
Milton, DE
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is August (1.38").
The driest month (with the least rainfall) is September (0.63").
Average rainfall days in September
Milton, DE
- Average rainfall days in September: 10.8 days
The month with the highest number of rainy days is July (13.6 days).
The month with the least rainy days is November (6.7 days).
Average snowfall in September
Milton, DE
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.75").
The months with the least snowfall are April, June, July, August, September and October (0").
Average snowfall days in September
Milton, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Milton, 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 30min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in September
Milton, DE
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is November (21.2 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in September
Milton, 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
Milton, DE
- Average cloud cover in September: 30
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Milton, 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).
