September weather forecast
Hanover, NH

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Weather in September

September welcomes the onset of Fall in Hanover, New Hampshire. Notably, the rainfall decreases to 1.85" (47mm), providing relief from the rains of previous months. The temperature range continues to decrease while the daylight hours also dwindle down. This month signals the start of color-changing foliage, a much-anticipated annual spectacle in New Hampshire. With its clear skies and pleasant weather, September in Hanover provides the perfect backdrop for autumn activities.

Temperature

As August shifts into September, a minor alteration in temperatures is observed, with average highs reducing from a moderately hot 76.3°F (24.6°C) to an agreeable 68.7°F (20.4°C). During September, Hanover consistently records a temperature low averaging a frosty 48.6°F (9.2°C).

Humidity

In September, the average relative humidity in Hanover is 80%.

Rainfall

The month with the least rainfall in Hanover is September, when the rain falls for 11.1 days and typically collects 1.85" (47mm) of precipitation.

Snowfall

June 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 6:13 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:31 pm EDT.

Sunshine

The average sunshine in September is 8.3h.

UV index

In September, the average daily maximum UV index in Hanover is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The UV index of 3 in September translates into these instructions:
Undertake protective steps - Preventing sun damage is advised. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
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Frequently asked questions

What are the temperatures in Hanover in September?

The average high-temperature, in September, in Hanover, is 68.7°F (20.4°C), while the average low-temperature is 48.6°F (9.2°C).

What is the average humidity in September in Hanover?

In September, the average relative humidity is 80%.

What is the driest month in Hanover?

September is the month with the least rainfall in Hanover, New Hampshire. Rain falls for 11.1 days and accumulates 1.85" (47mm) of precipitation.

How much does it rain in Hanover in September?

In Hanover, New Hampshire, during September, the rain falls for 11.1 days and regularly aggregates up to 1.85" (47mm) of precipitation.

When it does not snow in Hanover?

In Hanover, snow does not fall in June through September.

Does it snow in Hanover in September?

In Hanover, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Hanover have in September?

In Hanover, the average day length in September is 12h and 29min.

When is the sunrise / sunset in September in Hanover?

In September, on the first day of the month, sunrise is at 6:13 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:31 pm EDT.

How many hours of sunshine does Hanover have in September?

The average sunshine duration in September in Hanover is 8.3h.

How high is the UV index in September in Hanover?

The average daily maximum UV index in September in Hanover, New Hampshire, is 3. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Hanover, NH

Average temperature in September - Hanover, NH
  • Average high temperature in September: 68.7°F

The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (25°F).

  • Average low temperature in September: 48.6°F

The month with the highest average low temperature is July (56.5°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).

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Average pressure in September
Hanover, NH

Average pressure in September - Hanover, 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).

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Average wind speed in September
Hanover, NH

Average wind speed in September - Hanover, NH
  • Average wind speed in September: 5.1mph

The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in September
Hanover, NH

Average humidity in September - Hanover, 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 May (75%).

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Average rainfall in September
Hanover, NH

Average rainfall in September - Hanover, NH
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is October (2.99").
The driest month (with the least rainfall) is September (1.85").

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Average rainfall days in September
Hanover, NH

Average rainfall days in September - Hanover, NH
  • Average rainfall days in September: 11.1 days

The month with the highest number of rainy days is July (17.2 days).
The month with the least rainy days is February (7.9 days).

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Average snowfall in September
Hanover, NH

Average snowfall in September - Hanover, NH
  • Average snowfall in September: 0"

The month with the highest snowfall is February (11.57").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Hanover, NH

Average snowfall days in September - Hanover, NH
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (16.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Hanover, NH

Average daylight in September / Average sunshine in September - Hanover, NH
  • Average daylight in September: 12h and 3min

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 2min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).

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Average sunshine days in September
Hanover, NH

Average sunshine days in September - Hanover, 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 February (9.8 days).

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Average UV index in September
Hanover, NH

Average UV index in September - Hanover, 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 February and December (UV index 1).

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Average cloud cover in September
Hanover, NH

Average cloud cover in September - Hanover, NH
  • Average cloud cover in September: 40

The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 37).

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Average visibility in September
Hanover, NH

Average visibility in September - Hanover, 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).

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Hanover, New Hampshire, USA

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