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 sees a slight reduction in average high-temperature, with a shift from a warm 84.7°F (29.3°C) in August to a still moderately hot 79°F (26.1°C). During September, Bethlehem observes a consistent average nighttime temperature of 59.5°F (15.3°C).Humidity
August through October, with an average relative humidity of 75%, are the least humid months.Rainfall
The month with the least rainfall in Bethlehem is September, when the rain falls for 11 days and typically collects 1.3" (33mm) of precipitation.Snowfall
May through September are months without snowfall in Bethlehem.Daylight
The average length of the day in September in Bethlehem is 12h and 25min.On the first day of the month, sunrise is at 7:11 am and sunset at 8:11 pm. On the last day of September, sunrise is at 7:37 am and sunset at 7:25 pm EDT.
Sunshine
The average sunshine in September in Bethlehem is 8.4h.UV index
In September, the average daily maximum UV index in Bethlehem is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: An average UV index of 5 in September transforms into this advice:
Take precautions - Protection against skin and eye damage is obliged. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Bethlehem in September?
What is the least humid month in Bethlehem?
What is the average humidity in September in Bethlehem?
What is the driest month in Bethlehem?
How many days does it rain in September in Bethlehem?
When it does not snow in Bethlehem?
Does it snow in Bethlehem in September?
How many hours of daylight does Bethlehem have in September?
When is the sunrise / sunset in September in Bethlehem?
How many hours of sunshine does Bethlehem have in September?
What is the UV index intensity in September in Bethlehem?
Average temperature in September
Bethlehem, IN
- Average high temperature in September: 79°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (38.3°F).
- Average low temperature in September: 59.5°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (25.3°F).
Average pressure in September
Bethlehem, 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 (29.95"Hg).
Average wind speed in September
Bethlehem, IN
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in September
Bethlehem, IN
- Average humidity in September: 75%
The months with the highest relative humidity are February and December (81%).
The months with the lowest relative humidity are August, September and October (75%).
Average rainfall in September
Bethlehem, IN
- Average rainfall in September: 1.3"
The wettest month (with the highest rainfall) is April (2.64").
The driest month (with the least rainfall) is September (1.3").
Average rainfall days in September
Bethlehem, IN
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in September
Bethlehem, IN
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.54").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Bethlehem, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.2 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
Bethlehem, IN
- 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: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in September
Bethlehem, IN
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is October (19.9 days).
The month with the least sunshine days is May (11.9 days).
Average UV index in September
Bethlehem, IN
- Average UV index in September: 5
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, November and December (UV index 2).
Average cloud cover in September
Bethlehem, IN
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Bethlehem, IN
- Average visibility in September: 6mi
The months with the highest visibility are March, April, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, May and July (5mi).
Bethlehem, Indiana, USA
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