September weather forecast and climate
Keene, NH

Weather in September

September, the first month of the autumn, in Keene, is still a pleasant month, with temperature in the range of an average high of 70°F (21.1°C) and an average low of 50.9°F (10.5°C).

Temperature

In Keene, the average high-temperature in September slightly decreases, from a moderately hot 78.1°F (25.6°C) in August, to an agreeable 70°F (21.1°C). The average low-temperature, in September, is 50.9°F (10.5°C).

Humidity

The average relative humidity in Keene is 79%.

Rainfall

In Keene, in September, it is raining for 9.3 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, in Keene, there are 125.1 rainfall days, and 11.69" (297mm) of precipitation is accumulated.

Snowfall

In Keene, New Hampshire, snow does not fall in June through September.

Daylight

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 Keene is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the average humidity in September in Keene?

The average relative humidity in September in Keene is 79%.

How many days does it rain in September in Keene?

In Keene, during September, the rain falls for 9.3 days and regularly aggregates up to 0.79" (20mm) of precipitation.

When it does not snow in Keene?

In Keene, New Hampshire, snow does not fall in June through September.

Does it snow in Keene in September?

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

How many hours of daylight does Keene have in September?

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

How many hours of sunshine does Keene have in September?

The average sunshine in September in Keene, New Hampshire, is 8.5h.

What is the UV index reading in September in Keene?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Keene, NH

Average temperature in September - Keene, NH
  • Average high temperature in September: 70°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (27.9°F).

  • Average low temperature in September: 50.9°F

The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).

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Average pressure in September
Keene, NH

Average pressure in September - Keene, NH
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is November (30.08").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in September
Keene, NH

Average wind speed in September - Keene, NH
  • Average wind speed in September: 5.4mph

The windiest months (with the highest average wind speed) are January, February and March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

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Average humidity in September
Keene, NH

Average humidity in September - Keene, 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 (74%).

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Average rainfall in September
Keene, NH

Average rainfall in September - Keene, NH
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is July (1.3").
The driest month (with the least rainfall) is March (0.75").

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Average rainfall days in September
Keene, NH

Average rainfall days in September - Keene, NH
  • Average rainfall days in September: 9.3 days

The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is January (6.3 days).

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Average snowfall in September
Keene, NH

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

The month with the highest snowfall is January (2.64").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Keene, NH

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

The month with the highest number of snowfall days is February (9.4 days).
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
Keene, NH

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 the shortest days is December (Average daylight: 9.1h).

  • 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).

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Average sunshine days in September
Keene, NH

Average sunshine days in September - Keene, NH
  • Average sunshine days in September: 17.2 days

The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (13.8 days).

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Average UV index in September
Keene, NH

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

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

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Average cloud cover in September
Keene, NH

Average cloud cover in September - Keene, NH
  • Average cloud cover in September: 38

Months with the most cloud cover are February and March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).

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Average visibility in September
Keene, NH

Average visibility in September - Keene, NH
  • Average visibility in September: 5mi

The month with the highest visibility is April (6mi).
Months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).

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