September weather forecast and climate
Hanover, NH

The first month of the autumn, September, is also an agreeable month in Hanover, New Hampshire, with average temperature varying between 68.7°F (20.4°C) and 48.6°F (9.2°C).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 76.3°F (24.6°C) in August, to an agreeable 68.7°F (20.4°C). The average low-temperature, in Hanover, is 48.6°F (9.2°C).

Humidity

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

Rainfall

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

Snowfall

June through September are months without snowfall in Hanover.

Daylight

In September, the average length of the day in Hanover is 12.5h.

Sunshine

The average sunshine is 8.3h.

UV index

In Hanover, New Hampshire, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Hanover?

In Hanover, New Hampshire, in September, the average high-temperature is 68.7°F (20.4°C), and the average low-temperature is 48.6°F (9.2°C).

What is the average humidity in September in Hanover?

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

How many days does it rain in September in Hanover?

In September, in Hanover, New Hampshire, the rain falls for 11.1 days. Throughout September, 1.85" (47mm) of precipitation is accumulated.

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.

Does it snow in Hanover in September?

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

When it does not snow in Hanover?

June through September are months without snowfall.

What is the average length of the day in September in Hanover?

In Hanover, the average length of the day in September is 12.5h.

How long on average sun shines in September in Hanover?

In September, the average sunshine in Hanover, New Hampshire, is 8.3h.

How high is the UV index in September in Hanover?

In September, the average daily maximum UV index in Hanover, New Hampshire, is 3. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.
Average temperature in September - Hanover, NH
  • Average high temperature in September: 20.4°C

The warmest month (with the highest average high temperature) is July (25.4°C).
The month with the lowest average high temperature is January (-3.9°C).

  • Average low temperature in September: 9.2°C

The month with the highest average low temperature is July (13.6°C).
The coldest month (with the lowest average low temperature) is January (-10.8°C).

Average pressure in September - Hanover, NH
  • Average pressure in September: 1017.6mbar

The month with the highest atmospheric pressure is November (1018.3mbar).
The month with the lowest atmospheric pressure is June (1013mbar).

Average wind speed in September - Hanover, NH
  • Average wind speed in September: 8.2km/h

The windiest month (with the highest average wind speed) is April (11.9km/h).
The calmest month (with the lowest average wind speed) is August (7.8km/h).

Average humidity in September - Hanover, NH
  • Average humidity in September: 80%

Months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is May (75%).

Average rainfall in September - Hanover, NH
  • Average rainfall in September: 47mm

The wettest month (with the highest rainfall) is October (76mm).
The driest month (with the least rainfall) is September (47mm).

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).

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

The month with the highest snowfall is February (294mm).
Months with the least snowfall are June, July, August and September (0mm).

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).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Hanover, NH
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 8.3h

The month with the most sunshine is August (Average sunshine: 10.1h).
The month with the least sunshine is February (Average sunshine: 3.6h).

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).

Average UV index in September - Hanover, NH
  • Average UV index in September: 3

Months with the highest UV index are May, June, July and August (UV index 5).
Months with the lowest UV index are February and December (UV index 1).

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).

Average visibility in September - Hanover, NH
  • Average visibility in September: 7km

Months with the highest visibility are April, May, June, July, August, October, November and December (8km).
Months with the lowest visibility are January, February, March and September (7km).