September weather forecastHyannis Port, MA
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in Hyannis Port, Massachusetts, with an average temperature fluctuating between 67.3°F (19.6°C) and 62.8°F (17.1°C).Temperature
September's onset brings an average high-temperature of a refreshing 67.3°F (19.6°C), showing a minute difference from August's 72.5°F (22.5°C). During the nights of September, the average low-temperature holds at a still enjoyable 62.8°F (17.1°C).Humidity
In September, the average relative humidity is 79%.Rainfall
In Hyannis Port, during September, the rain falls for 11.3 days and regularly aggregates up to 1.93" (49mm) of precipitation. Throughout the year, there are 157.2 rainfall days, and 31.77" (807mm) of precipitation is accumulated.Snowfall
In Hyannis Port, snow does not fall in May through November.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:07 am and sunset at 7:14 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 6:24 pm EDT.
Sunshine
In September, the average sunshine is 8.8h.UV index
The average daily maximum UV index in September in Hyannis Port is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 4 during September leads to these instructions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hyannis Port, MA
- Average high temperature in September: 67.3°F
The warmest month (with the highest average high temperature) is August (72.5°F).
The month with the lowest average high temperature is January (38.3°F).
- Average low temperature in September: 62.8°F
The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).
Average pressure in September
Hyannis Port, MA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Hyannis Port, MA
- Average wind speed in September: 12.6mph
The windiest month (with the highest average wind speed) is January (16.5mph).
The calmest month (with the lowest average wind speed) is August (10.6mph).
Average humidity in September
Hyannis Port, MA
- Average humidity in September: 79%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is November (74%).
Average rainfall in September
Hyannis Port, MA
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is October (3.7").
The driest month (with the least rainfall) is August (1.73").
Average rainfall days in September
Hyannis Port, MA
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is February (10.3 days).
Average snowfall in September
Hyannis Port, MA
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.93").
The months with the least snowfall are May, June, July, August, September, October and November (0").
Average snowfall days in September
Hyannis Port, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.1 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
Hyannis Port, MA
- Average daylight in September: 12h and 30min
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 12min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in September
Hyannis Port, MA
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is August (17.7 days).
The month with the least sunshine days is February (11.4 days).
Average UV index in September
Hyannis Port, MA
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Hyannis Port, MA
- Average cloud cover in September: 31
The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Hyannis Port, MA
- 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).
