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
As Prince William transitions from August to September, the average high-temperatures adjust to a still moderately hot 75°F (23.9°C), nearly the same as the previous 79.9°F (26.6°C). In the month of September, Prince William experiences an average low-temperature of 56.8°F (13.8°C).Humidity
In Prince William, the average relative humidity in September is 78%.Rainfall
In September, in Prince William, the rain falls for 10.8 days. Throughout September, 1.22" (31mm) of precipitation is accumulated. In Prince William, during the entire year, the rain falls for 138.9 days and collects up to 19.06" (484mm) of precipitation.Snowfall
In Prince William, snow does not fall in May through September.Daylight
In September, the average length of the day in Prince William is 12h and 27min.On the first day of September in Prince William, sunrise is at 7:14 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 7:29 pm EDT.
Sunshine
In September, the average sunshine is 8.2h.UV index
The average daily maximum UV index in September in Prince William is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. It's recommended to limit sun exposure when its radiation is at its peak during midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Frequently asked questions
What is the average September temperature in Prince William?
What is the average humidity in September in Prince William?
How many days does it rain in September in Prince William?
When it does not snow in Prince William?
Does it snow in Prince William in September?
What is the average length of the day in September in Prince William?
What time are sunrise and sunset in September in Prince William?
How long on average sun shines in September in Prince William?
What is the UV index intensity in September in Prince William?
Average temperature in September
Prince William, IN
- Average high temperature in September: 75°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.6°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in September
Prince William, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Prince William, IN
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
Prince William, IN
- Average humidity in September: 78%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Prince William, IN
- Average rainfall in September: 1.22"
The wettest months (with the highest rainfall) are April and May (2.28").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days in September
Prince William, IN
- Average rainfall days in September: 10.8 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in September
Prince William, IN
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Prince William, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Prince William, IN
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Prince William, IN
- Average sunshine days in September: 16 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (10.5 days).
Average UV index in September
Prince William, IN
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in September
Prince William, IN
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are June and August (Cloud cover 33).
Average visibility in September
Prince William, IN
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Prince William, Indiana, USA
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