September weather forecast and climate
Concord, NH

A rocky coast overlooking beach homes in Rye, Concord point, New Hampshire
A rocky coast overlooking beach homes in Rye, Concord point, New Hampshire
The first month of the autumn, September, is still a pleasant month in Concord, New Hampshire, with average temperature fluctuating between 52°F (11.1°C) and 71.4°F (21.9°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 78.8°F (26°C) in August, to an agreeable 71.4°F (21.9°C). In Concord, New Hampshire, the average low-temperature is 52°F (11.1°C).

Humidity

The average relative humidity in Concord is 78%.

Rainfall

September is the month with the least rainfall. Rain falls for 10.7 days and accumulates 1.65" (42mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In Concord, the average length of the day is 12.5h.

Sunshine

In September, the average sunshine is 8.5h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Concord?

In September, in Concord, New Hampshire, the average high-temperature is 71.4°F (21.9°C), and the average low-temperature is 52°F (11.1°C).

What is the average humidity in September in Concord?

In Concord, the average relative humidity in September is 78%.

How much does it rain in Concord in September?

In Concord, in September, during 10.7 rainfall days, 1.65" (42mm) of precipitation is typically accumulated.

What is the driest month in Concord?

The month with the least rainfall is September when the rain falls for 10.7 days and typically collects 1.65" (42mm) of precipitation.

Does it snow in Concord in September?

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

When it does not snow in Concord?

In Concord snow does not fall in June through September.

How many hours of daylight does Concord have in September?

The average length of the day in September in Concord, New Hampshire, is 12.5h.

How many hours of sunshine does Concord have in September?

The average sunshine in September in Concord is 8.5h.

What is the UV index reading in September in Concord?

In Concord, New Hampshire, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.
Average temperature in September - Concord, NH
  • Average high temperature in September: 21.9°C

The warmest month (with the highest average high temperature) is July (27.1°C).
The month with the lowest average high temperature is January (-2°C).

  • Average low temperature in September: 11.1°C

The month with the highest average low temperature is July (15.3°C).
The coldest month (with the lowest average low temperature) is January (-9.2°C).

Average pressure in September - Concord, NH
  • Average pressure in September: 1017.7mbar

The month with the highest atmospheric pressure is November (1018.2mbar).
The month with the lowest atmospheric pressure is June (1013.1mbar).

Average wind speed in September - Concord, NH
  • Average wind speed in September: 8.1km/h

The windiest month (with the highest average wind speed) is January (12.4km/h).
The calmest month (with the lowest average wind speed) is August (7.7km/h).

Average humidity in September - Concord, NH
  • Average humidity in September: 78%

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is April (73%).

Average rainfall in September - Concord, NH
  • Average rainfall in September: 42mm

The wettest month (with the highest rainfall) is October (77mm).
The driest month (with the least rainfall) is September (42mm).

Average rainfall days in September - Concord, NH
  • Average rainfall days in September: 10.7 days

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (6.5 days).

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

The month with the highest snowfall is February (187mm).
Months with the least snowfall are June, July, August and September (0mm).

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

The month with the highest number of snowfall days is January (10.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 8.5h

The month with the most sunshine is August (Average sunshine: 10.3h).
The month with the least sunshine is February (Average sunshine: 4.4h).

Average sunshine days in September - Concord, NH
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is September (17.4 days).
The month with the least sunshine days is April (13.6 days).

Average UV index in September - Concord, NH
  • Average UV index in September: 4

Months with the highest UV index are July and August (UV index 6).
Months with the lowest UV index are January, February, March, October, November and December (UV index 2).

Average cloud cover in September - Concord, NH
  • Average cloud cover in September: 37

Months with the most cloud cover are February and March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 34).

Average visibility in September - Concord, NH
  • Average visibility in September: 8km

The month with the highest visibility is April (9km).
Months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (8km).