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
In September, the average high-temperature marginally decreases from a moderately hot 78.6°F (25.9°C) in August to a pleasant 73°F (22.8°C). Throughout the month of September, the nighttime temperature dips to an average of 55.2°F (12.9°C).Humidity
In September, the average relative humidity in Swan is 79%.Rainfall
In Swan, during September, the rain falls for 10.9 days and regularly aggregates up to 0.91" (23mm) of precipitation. Throughout the year, there are 125.3 rainfall days, and 13.11" (333mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 7:07 am and sunset at 8:13 pm. On the last day of September, sunrise is at 7:37 am and sunset at 7:23 pm EDT.
Sunshine
The average sunshine in September is 8h.UV index
In Swan, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 4 in September translates into this advice:
Make use of precautions - Suggestions to resist sunburn are communicated. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Swan in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Swan have in September?
When is the sunrise / sunset in September in Swan?
How many hours of sunshine does Swan have in September?
What is the UV index reading in September in Swan?
Average temperature in September
Swan, IN
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (30.2°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).
Average pressure in September
Swan, IN
- Average pressure in September: 30.04"Hg
The months with the highest atmospheric pressure are January and November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Swan, IN
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Swan, IN
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is October (76%).
Average rainfall in September
Swan, IN
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is May (1.69").
The driest month (with the least rainfall) is February (0.67").
Average rainfall days in September
Swan, IN
- Average rainfall days in September: 10.9 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in September
Swan, IN
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.69").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Swan, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Swan, IN
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in September
Swan, IN
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is January (19.2 days).
The month with the least sunshine days is July (12 days).
Average UV index in September
Swan, IN
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Swan, IN
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in September
Swan, IN
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Swan, Indiana, USA
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