Keene
New Hampshire, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Keene, NH

The first month of the autumn, September, is still a warm month in Keene, New Hampshire, with average temperature varying between 73.4°F (23°C) and 47.8°F (8.8°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 81.5°F (27.5°C) in August, to a still warm 73.4°F (23°C). The average low-temperature, in September, is 47.8°F (8.8°C).

Rainfall

In Keene, it is raining for 10 days, with typically 3.3" (84mm) of accumulated precipitation. In Keene, during the entire year, the rain falls for 138 days and collects up to 42.2" (1071mm) of precipitation.

Daylight

In Keene, New Hampshire, the average length of the day in September is 12.5h.

Sunshine

In September, the average sunshine is 7h.

UV index

The average daily maximum UV index in Keene is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Keene?

In September, in Keene, the average high-temperature is 73.4°F (23°C), and the average low-temperature is 47.8°F (8.8°C).

How many days does it rain in September in Keene?

In September, in Keene, New Hampshire, the rain falls for 10 days. Throughout September, 3.3" (84mm) of precipitation is accumulated.

How many hours of daylight does Keene have in September?

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

How long on average sun shines in September in Keene?

In September, the average sunshine in Keene is 7h.

How high is the UV index in September in Keene?

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Keene, NH
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (32.2°F).

  • Average low temperature in September: 47.8°F

The month with the highest average low temperature is July (57.4°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).

Average rainfall in September - Keene, NH
  • Average rainfall in September: 3.3"

Wettest months (with the highest rainfall) are May and August (3.9").
The driest month (with the lowest rainfall) is February (2.9").

Average rainfall days in September - Keene, NH
  • Average rainfall days in September: 10 days

Months with the highest number of rainy days are May, November and December (13 days).
Months with the lowest number of rainy days are February, July, September and October (10 days).

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

The month with the longest days is June (Average daylight: 15.3h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in September: 7h

Months with most sunshine are June and July (Average sunshine: 9h).
Months with least sunshine are November and December (Average sunshine: 4).

Average UV index in September - Keene, NH
  • Average UV index in September: 6

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).