September weather forecastMount Washington, NH
September weather forecast for Mount Washington, New Hampshire: On the first day of September in Mount Washington, sunrise is at 6:09 am and sunset at 7:20 pm. As September arrives, Mount Washington's weather displays a minor decrease in high-temperatures, transitioning from August's pleasant 73°F (22.8°C) to a refreshing 66°F (18.9°C).
September
Weather in September
September marks the transition from summer to autumn in Mount Washington. September enjoys warm temperatures despite shorter daylight hours, making it a lovely time to embrace the outdoors. The highest recorded temperature in September drops to 66°F (18.9°C), and it offers minim rainfall of 0.94" (24mm). The weather in September is perfect for visitors wanting to witness the onset of fall foliage, with the landscape gradually turning into beautiful hues of orange and brown.Temperature
As September arrives, Mount Washington's weather displays a minor decrease in high-temperatures, transitioning from August's pleasant 73°F (22.8°C) to a refreshing 66°F (18.9°C). Mount Washington, in the month of September, anticipates a consistent average low-temperature of 46.9°F (8.3°C).Humidity
In Mount Washington, the average relative humidity in September is 80%.Rainfall
September is the month with the least rainfall. Rain falls for 10.6 days and accumulates 0.94" (24mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 30min.On the first day of September in Mount Washington, sunrise is at 6:09 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 6:27 pm EDT.
Sunshine
In September, the average sunshine is 8.3h.UV index
In Mount Washington, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mount Washington, NH
- Average high temperature in September: 66°F
The warmest month (with the highest average high temperature) is July (75°F).
The month with the lowest average high temperature is January (21.7°F).
- Average low temperature in September: 46.9°F
The month with the highest average low temperature is July (54.7°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).
Average pressure in September
Mount Washington, 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
Mount Washington, NH
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is February (9.8mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).
Average humidity in September
Mount Washington, NH
- Average humidity in September: 80%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (77%).
Average rainfall in September
Mount Washington, NH
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is April (2.44").
The driest month (with the least rainfall) is September (0.94").
Average rainfall days in September
Mount Washington, NH
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is November (8 days).
Average snowfall in September
Mount Washington, NH
- Average snowfall in September: 0"
The month with the highest snowfall is January (11.42").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Mount Washington, NH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (20.4 days).
The months with the least snowfall days are July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Mount Washington, 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: 8h and 18min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days in September
Mount Washington, NH
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is September (16.2 days).
The month with the least sunshine days is February (7.8 days).
Average UV index in September
Mount Washington, 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 February and December (UV index 1).
Average cloud cover in September
Mount Washington, NH
- Average cloud cover in September: 41
The month with the most cloud cover is February (Cloud cover 64).
The months with the least cloud cover are July, August and September (Cloud cover 41).
Average visibility in September
Mount Washington, 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).
