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's arrival subtly correlates with a reduction in the average high-temperature, down from a moderately hot 79.3°F (26.3°C) in August to a pleasant 72°F (22.2°C). In Harwinton, September's nights observe an average temperature dip to a fresh 53.4°F (11.9°C).Humidity
In Harwinton, the average relative humidity in September is 79%.Rainfall
The month with the least rainfall is September, when the rain falls for 12.4 days and typically collects 2.01" (51mm) of precipitation.Snowfall
In Harwinton, snow does not fall in June through September.Daylight
In Harwinton, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:35 pm EDT.
Sunshine
The average sunshine in September in Harwinton is 8.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: An average UV index of 4 in September transforms into this advice:
Adopt protective measures - Suggestions to resist sunburn are offered. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Harwinton in September?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Harwinton have in September?
What is the UV index intensity in September?
Average temperature in September
Harwinton, CT
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in September: 53.4°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 (19.2°F).
Average pressure in September
Harwinton, CT
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Harwinton, CT
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in September
Harwinton, CT
- Average humidity in September: 79%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (73%).
Average rainfall in September
Harwinton, CT
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in September
Harwinton, CT
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in September
Harwinton, CT
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Harwinton, CT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Harwinton, 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 3min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in September
Harwinton, CT
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is June (11.8 days).
Average UV index in September
Harwinton, CT
- Average UV index in September: 4
The month with the highest UV index is June (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
Harwinton, CT
- Average cloud cover in September: 40
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in September
Harwinton, CT
- Average visibility in September: 5mi
The months with the highest visibility are April, November and December (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September and October (5mi).
Harwinton, Connecticut, USA
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