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
The beginning of September reveals an average high-temperature of a still moderately hot 74.7°F (23.7°C), showing minimal deviation from the previous month. The average temperature during September nights dips to a refreshing 56.7°F (13.7°C).Humidity
In September, the average relative humidity is 78%.Rainfall
In Boston, in September, during 13.3 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. Throughout the year, there are 154.1 rainfall days, and 23.74" (603mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 7:08 am and sunset at 8:10 pm. On the last day of September, sunrise is at 7:35 am and sunset at 7:22 pm EDT.
Sunshine
In Boston, the average sunshine in September is 8.1h.UV index
In Boston, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Boston 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 Boston in September?
How many hours of daylight does Boston have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Boston, IN
- Average high temperature in September: 74.7°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in September: 56.7°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in September
Boston, IN
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January and November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Boston, IN
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in September
Boston, IN
- Average humidity in September: 78%
The months with the highest relative humidity are January and December (83%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Boston, IN
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is November (1.5").
Average rainfall days in September
Boston, IN
- Average rainfall days in September: 13.3 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is February (7.4 days).
Average snowfall in September
Boston, IN
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Boston, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.2 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
Boston, 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 24min).
- Average sunshine in September: 8h and 1min
The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Boston, IN
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (9.8 days).
Average UV index in September
Boston, 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
Boston, IN
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Boston, 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).
Boston, Indiana, USA
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