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
Harwinton's September weather shows a modest shift in high-temperatures, falling from August's moderately hot 79.3°F (26.3°C) to a pleasant 72°F (22.2°C). In Harwinton, the average temperature during the nights of September drops to a cool 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
In September, the average sunshine is 8.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The UV index of 4 during September translates into the following guidance:
Prioritize safety - Recommendations to avert sunburn are shared. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Frequently asked questions
What is the average September temperature in Harwinton?
What is the average humidity in September in Harwinton?
What is the driest month in Harwinton?
How many days does it rain in September in Harwinton?
When it does not snow in Harwinton?
Does it snow in Harwinton in September?
What is the average length of the day in September in Harwinton?
What time are sunrise and sunset in September in Harwinton?
How long on average sun shines in September in Harwinton?
How high is the UV index in September in Harwinton?
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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