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
September's arrival subtly correlates with a reduction in the average high-temperature, down from a warm 81.1°F (27.3°C) in August to a still moderately hot 75.7°F (24.3°C). September's nights observe an average temperature of 65.3°F (18.5°C).Humidity
In Harbeson, 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
In Harbeson, snow does not fall in April, June through October.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:30 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:45 pm EDT.
Sunshine
In Harbeson, the average sunshine in September is 9.5h.UV index
In Harbeson, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum UV index of 5 in September translates into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow in Harbeson?
What is the average length of the day in September in Harbeson?
What time are sunrise and sunset in September?
How many hours of sunshine does Harbeson have in September?
What is the UV index reading in September?
Average temperature in September
Harbeson, 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
Harbeson, 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
Harbeson, 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
Harbeson, 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
Harbeson, 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
Harbeson, 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
Harbeson, 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
Harbeson, 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
Harbeson, DE
- Average daylight in September: 12h and 2min
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 3min
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
Harbeson, 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
Harbeson, 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
Harbeson, 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
Harbeson, 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).
Harbeson, Delaware, USA
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