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
Welcoming September, Sullivan notes an average high-temperature of a still warm 77.7°F (25.4°C), nearly consistent with August's 82.6°F (28.1°C). Sullivan's average low-temperature for the month of September records at a refreshing 59.5°F (15.3°C).Humidity
In Sullivan, the average relative humidity in September is 75%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.8 days and typically collects 1.54" (39mm) of precipitation.Snowfall
In Sullivan, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 7:19 am and sunset at 8:19 pm. On the last day of September, sunrise is at 7:45 am and sunset at 7:33 pm EDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: In September, a regular UV index of 5 translates into these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Sullivan in September?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Sullivan have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Sullivan have in September?
What is the UV index reading in September?
Average temperature in September
Sullivan, IN
- Average high temperature in September: 77.7°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in September: 59.5°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in September
Sullivan, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Sullivan, IN
- Average wind speed in September: 6.6mph
The windiest months (with the highest average wind speed) are January and February (9.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in September
Sullivan, IN
- Average humidity in September: 75%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Sullivan, IN
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is April (4.06").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in September
Sullivan, IN
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (8.5 days).
Average snowfall in September
Sullivan, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Sullivan, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.3 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
Sullivan, IN
- 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 30min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 4h and 24min).
Average sunshine days in September
Sullivan, IN
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (10.1 days).
Average UV index in September
Sullivan, IN
- 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
Sullivan, IN
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Sullivan, IN
- 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).
Sullivan, Indiana, USA
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