September weather forecastBristol, NH
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Bristol, New Hampshire, with temperature in the range of an average low of 49.1°F (9.5°C) and an average high of 68.9°F (20.5°C).Temperature
September ushers in a minute temperature change, with average high-temperatures reducing from August's moderately hot 76.6°F (24.8°C) to a pleasant 68.9°F (20.5°C). Throughout the month of September, the average temperature dips to a chilly 49.1°F (9.5°C) at night.Humidity
In September, the average relative humidity is 80%.Rainfall
September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.85" (47mm) of precipitation.Snowfall
In Bristol, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 6:11 am and sunset at 7:21 pm. On the last day of September, sunrise is at 6:44 am and sunset at 6:29 pm EDT.
Sunshine
The average sunshine in September is 8.3h.UV index
In Bristol, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 3 during September translates into the following directions:
Act with care - The need to guard against sun damage is communicated. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bristol, NH
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (25.7°F).
- Average low temperature in September: 49.1°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).
Average pressure in September
Bristol, NH
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Bristol, NH
- Average wind speed in September: 4.8mph
The windiest months (with the highest average wind speed) are January and February (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Bristol, NH
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Bristol, NH
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is October (3.15").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in September
Bristol, NH
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is April (15.7 days).
The month with the least rainy days is January (10.1 days).
Average snowfall in September
Bristol, NH
- Average snowfall in September: 0"
The month with the highest snowfall is February (9.41").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Bristol, NH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Bristol, NH
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in September
Bristol, NH
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is September (16.8 days).
The month with the least sunshine days is February (10.2 days).
Average UV index in September
Bristol, NH
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Bristol, NH
- Average cloud cover in September: 40
The months with the most cloud cover are February and March (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in September
Bristol, NH
- Average visibility in September: 4mi
The months with the highest visibility are April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are January, February, March and September (4mi).
