September weather forecastLoudon, NH
September
Weather in September
September brings forth the advent of autumn, adding a vibrant color palette to Loudon's landscape. The transition from an August high of 78.4°F (25.8°C) to a milder 70.7°F (21.5°C) in this month is a sign of the changing seasons. The days, while still warm, start to have a subtle coolness in the air, foretelling the upcoming cooler months. Dwindling daylight hours coupled with cooler evenings, signals the retreat of summer. As September concludes, crimson and gold foliage blanket the city, welcoming a full-fledged fall in October.Temperature
In the transition to September, Loudon observes a minor drop in the average high-temperature, shifting from a moderately hot 78.4°F (25.8°C) in August to a pleasant 70.7°F (21.5°C). Loudon experiences an average low-temperature of 50.7°F (10.4°C) in month of September.Humidity
In September, the average relative humidity is 79%.Rainfall
September is the month with the least rainfall in Loudon. Rain falls for 10.5 days and accumulates 1.57" (40mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day in Loudon, New Hampshire, is 12h and 29min.On the first day of the month, sunrise is at 6:10 am and sunset at 7:20 pm. On the last day of September, in Loudon, sunrise is at 6:42 am and sunset at 6:28 pm EDT.
Sunshine
In September, the average sunshine is 8.4h.UV index
In Loudon, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In September, a regular UV index of 4 translates into these guidelines:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Loudon, NH
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (27.7°F).
- Average low temperature in September: 50.7°F
The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure in September
Loudon, 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
Loudon, NH
- Average wind speed in September: 4.9mph
The windiest month (with the highest average wind speed) is January (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Loudon, NH
- Average humidity in September: 79%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is April (73%).
Average rainfall in September
Loudon, NH
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is October (3.15").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in September
Loudon, NH
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is April (15.2 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in September
Loudon, NH
- Average snowfall in September: 0"
The month with the highest snowfall is February (7.36").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Loudon, NH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Loudon, 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 24min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in September
Loudon, NH
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is September (17.2 days).
The month with the least sunshine days is April (12.4 days).
Average UV index in September
Loudon, 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, October, November and December (UV index 2).
Average cloud cover in September
Loudon, NH
- Average cloud cover in September: 38
The month with the most cloud cover is March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Loudon, NH
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
