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
With the onset of September, Granby's climate undergoes a slight change as the average high-temperature moves from a warm 80.2°F (26.8°C) in August to an agreeable 73°F (22.8°C). Throughout September, an average low-temperature of 53.8°F (12.1°C) is experienced in Granby.Humidity
The average relative humidity in September is 77%.Rainfall
In Granby, in September, during 10.6 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. Throughout the year, there are 130.2 rainfall days, and 19.25" (489mm) of precipitation is accumulated.Snowfall
In Granby, Connecticut, snow does not fall in June through October.Daylight
The average length of the day in September in Granby is 12h and 28min.On the first day of September, sunrise is at 6:17 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:34 pm EDT.
Sunshine
The average sunshine in September is 8.7h.UV index
In Granby, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Be vigilant - Preventing sunburn is recommended. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Granby?
What is the average humidity in September in Granby?
How many days does it rain in September in Granby?
When it does not snow in Granby?
What is the average length of the day in September in Granby?
What time are sunrise and sunset in September in Granby?
How long on average sun shines in September in Granby?
What is the UV index intensity in September in Granby?
Average temperature in September
Granby, CT
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in September: 53.8°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Granby, CT
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Granby, CT
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Granby, CT
- Average humidity in September: 77%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Granby, CT
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is July (2.01").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in September
Granby, CT
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in September
Granby, CT
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.48").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Granby, CT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Granby, CT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Granby, CT
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is January (19.9 days).
The month with the least sunshine days is July (14.1 days).
Average UV index in September
Granby, CT
- 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, March, November and December (UV index 2).
Average cloud cover in September
Granby, CT
- Average cloud cover in September: 37
The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Granby, CT
- Average visibility in September: 5mi
The months with the highest visibility are January, March, April, October, November and December (6mi).
The months with the lowest visibility are February, May, June, July, August and September (5mi).
Granby, Connecticut, USA
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