September weather forecastExeter, NH
September
Weather in September
September brings the onset of fall in Exeter, and temperatures start their descent, shuttle daily between a comfortable 55.2°F (12.9°C) and 70.7°F (21.5°C). The precipitation is the lowest in the year, with only 0.2" (5mm) of rainfall recorded. At the same time, the days get slightly shorter, and the long daylight hours of summer start to decrease. The arrival of autumn adds a distinct charm to the panorama, making this month a good time to enjoy nature walks in the crisp air.Temperature
Exeter, New Hampshire, observes a small decrease in the average high-temperature with the arrival of September, falling from August's warm 78.3°F (25.7°C) to a pleasant 70.7°F (21.5°C). In the month of September, the nighttime temperature in Exeter, New Hampshire, dips to a steady average of 55.2°F (12.9°C).Humidity
In Exeter, the average relative humidity in September is 78%.Rainfall
September is the month with the least rainfall. Rain falls for 5.3 days and accumulates 0.2" (5mm) of precipitation.Snowfall
In Exeter, snow does not fall in May through October.Daylight
The average length of the day in September in Exeter is 12h and 29min.On the first day of September, sunrise is at 6:09 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:26 pm EDT.
Sunshine
In September, the average sunshine in Exeter, New Hampshire, is 8.3h.UV index
In Exeter, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In September, a regular UV index of 4 translates into these guidelines:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Exeter, NH
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (31.8°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in September
Exeter, 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
Exeter, NH
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in September
Exeter, NH
- Average humidity in September: 78%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in September
Exeter, NH
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is November (0.63").
The driest month (with the least rainfall) is September (0.2").
Average rainfall days in September
Exeter, NH
- Average rainfall days in September: 5.3 days
The month with the highest number of rainy days is July (8.1 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Exeter, NH
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.75").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Exeter, NH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.9 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
Exeter, 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 6min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Exeter, NH
- Average sunshine days in September: 23.4 days
The month with the most sunshine days is December (24.5 days).
The month with the least sunshine days is July (19.8 days).
Average UV index in September
Exeter, 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
Exeter, NH
- Average cloud cover in September: 35
The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Exeter, 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).
