September weather forecastDover, NH
September
Weather in September
September signifies the onset of autumn in Dover with temperatures dipping to an average high of 68.9°F (20.5°C) from August's heat. Even though temperatures are decreasing, this month still experiences relatively less rainfall with 1.26" (32mm). As September segues to October, the fall foliage display intensifies, painting the city in vibrant hues. With its mild weather and dramatic landscapes, September adds a certain charm to the sightseeing, hiking, and apple-picking seasons in Dover.Temperature
In Dover, the beginning of September is marked by a marginally lowered average high-temperature, shifting from August's moderately hot 75.7°F (24.3°C) to a pleasant 68.9°F (20.5°C). Throughout September, Dover experiences a low-temperature average of 55.6°F (13.1°C).Humidity
In Dover, New Hampshire, the average relative humidity in September is 79%.Rainfall
The month with the least rainfall in Dover is September, when the rain falls for 10.7 days and typically collects 1.26" (32mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:08 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:25 pm EDT.
Sunshine
In September, the average sunshine in Dover is 8.6h.UV index
In Dover, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 4 in September translates into this advice:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dover, NH
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (31.6°F).
- Average low temperature in September: 55.6°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in September
Dover, 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 (29.92"Hg).
Average wind speed in September
Dover, NH
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is January (11.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in September
Dover, NH
- Average humidity in September: 79%
The months with the highest relative humidity are June and July (80%).
The months with the lowest relative humidity are April and November (75%).
Average rainfall in September
Dover, NH
- Average rainfall in September: 1.26"
The wettest months (with the highest rainfall) are June and December (2.13").
The driest month (with the least rainfall) is September (1.26").
Average rainfall days in September
Dover, NH
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is July (14.6 days).
The months with the least rainy days are January and February (6.3 days).
Average snowfall in September
Dover, NH
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.86").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Dover, NH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Dover, NH
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).
Average sunshine days in September
Dover, NH
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is July (14.3 days).
Average UV index in September
Dover, NH
- Average UV index in September: 4
The months with the highest UV index are 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
Dover, NH
- Average cloud cover in September: 32
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Dover, NH
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
