September weather forecastBretton Woods, NH
September
Weather in September
The advent of September in Bretton Woods brings along the start of the fall season, characterized by a noticeable drop in temperatures. The countryside becomes a picturesque panorama, with leaves changing color from green to hues of yellow, orange, and red. The cooling weather sees a reduction in rainfall from 3.23" (82mm) in August to 2.24" (57mm). Despite the decrease in temperatures, humidity levels remain relatively high. As September gives way to October, the weather continues to cool down, signaling the onset of the cold season.Temperature
With the arrival of September, Bretton Woods experiences a modest decline in average high-temperatures, transitioning from a pleasant 72.9°F (22.7°C) in August to a refreshing 65.8°F (18.8°C). Bretton Woods records an average nighttime low-temperature of 46°F (7.8°C) throughout September.Humidity
In September, the average relative humidity is 81%.Rainfall
September is the month with the least rainfall. Rain falls for 13.2 days and accumulates 2.24" (57mm) of precipitation.Snowfall
In Bretton Woods, New Hampshire, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 30min.On the first day of the month, sunrise is at 6:09 am and sunset at 7:21 pm. On the last day of September, sunrise is at 6:43 am and sunset at 6:27 pm EDT.
Sunshine
In Bretton Woods, the average sunshine in September is 7.8h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Undertake protective steps - Preventing sun damage is advised. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bretton Woods, NH
- Average high temperature in September: 65.8°F
The warmest month (with the highest average high temperature) is July (74.1°F).
The month with the lowest average high temperature is January (21.9°F).
- Average low temperature in September: 46°F
The month with the highest average low temperature is July (54.1°F).
The coldest month (with the lowest average low temperature) is January (8.6°F).
Average pressure in September
Bretton Woods, NH
- 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 (29.91"Hg).
Average wind speed in September
Bretton Woods, NH
- Average wind speed in September: 4.7mph
The windiest months (with the highest average wind speed) are January and February (6.9mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity in September
Bretton Woods, NH
- Average humidity in September: 81%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (77%).
Average rainfall in September
Bretton Woods, NH
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is October (3.62").
The driest month (with the least rainfall) is September (2.24").
Average rainfall days in September
Bretton Woods, NH
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is July (19.1 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in September
Bretton Woods, NH
- Average snowfall in September: 0"
The month with the highest snowfall is February (17.44").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Bretton Woods, NH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (22.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Bretton Woods, NH
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 7h and 48min
The months with the most sunshine are July and August (Average sunshine: 9h and 18min).
The month with the least sunshine is February (Average sunshine: 2h and 42min).
Average sunshine days in September
Bretton Woods, NH
- Average sunshine days in September: 14.1 days
The month with the most sunshine days is September (14.1 days).
The month with the least sunshine days is February (5.8 days).
Average UV index in September
Bretton Woods, NH
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in September
Bretton Woods, NH
- Average cloud cover in September: 45
The month with the most cloud cover is February (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 43).
Average visibility in September
Bretton Woods, NH
- Average visibility in September: 4mi
The months with the highest visibility are May, June and July (5mi).
The months with the lowest visibility are January, February, March, April, August, September, October, November and December (4mi).
