September weather forecast and climate
Greenville, NH

Weather in September

The first month of the autumn, September, is still a pleasant month in Greenville, New Hampshire, with temperature in the range of an average low of 52°F (11.1°C) and an average high of 70.5°F (21.4°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 77.7°F (25.4°C) in August, to an agreeable 70.5°F (21.4°C). In Greenville, in September, the average low-temperature is 52°F (11.1°C).

Humidity

The average relative humidity in Greenville is 79%.

Rainfall

September is the month with the least rainfall in Greenville. Rain falls for 10.1 days and accumulates 0.71" (18mm) of precipitation.

Snowfall

June through September are months without snowfall in Greenville.

Daylight

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

Sunshine

In September, the average sunshine in Greenville is 8.1h.

UV index

In Greenville, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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 temperature in September in Greenville?

The average high-temperature, in September, in Greenville, is 70.5°F (21.4°C), while the average low-temperature is 52°F (11.1°C).

What is the average humidity in September in Greenville?

The average relative humidity in September is 79%.

How many days does it rain in September in Greenville?

In Greenville, New Hampshire, in September, during 10.1 rainfall days, 0.71" (18mm) of precipitation is typically accumulated.

What is the driest month in Greenville?

September is the month with the least rainfall in Greenville, New Hampshire. Rain falls for 10.1 days and accumulates 0.71" (18mm) of precipitation.

Does it snow in Greenville in September?

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

When it does not snow in Greenville?

June through September are months without snowfall.

How many hours of daylight does Greenville have in September?

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

How many hours of sunshine does Greenville have in September?

In Greenville, New Hampshire, the average sunshine in September is 8.1h.

How high is the UV index in September in Greenville?

In Greenville, New Hampshire, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.

Average temperature in September
Greenville, NH

Average temperature in September - Greenville, NH
  • Average high temperature in September: 70.5°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (28.6°F).

  • Average low temperature in September: 52°F

The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (16°F).

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Average pressure in September
Greenville, NH

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

The month with the highest atmospheric pressure is November (30.07").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in September
Greenville, NH

Average wind speed in September - Greenville, NH
  • Average wind speed in September: 5.6mph

The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

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Average humidity in September
Greenville, NH

Average humidity in September - Greenville, NH
  • Average humidity in September: 79%

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

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Average rainfall in September
Greenville, NH

Average rainfall in September - Greenville, NH
  • Average rainfall in September: 0.71"

The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is September (0.71").

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Average rainfall days in September
Greenville, NH

Average rainfall days in September - Greenville, NH
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is February (4.2 days).

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Average snowfall in September
Greenville, NH

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

The month with the highest snowfall is November (3.9").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Greenville, NH

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

The month with the highest number of snowfall days is February (9.7 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
Greenville, NH

Average daylight in September / Average sunshine in September - Greenville, 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: 8.1h

The month with the most sunshine is August (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 4.4h).

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Average sunshine days in September
Greenville, NH

Average sunshine days in September - Greenville, NH
  • Average sunshine days in September: 17.9 days

The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is June (14.3 days).

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Average UV index in September
Greenville, NH

Average UV index in September - Greenville, 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
Greenville, NH

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

The month with the most cloud cover is March (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 36).

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Average visibility in September
Greenville, NH

Average visibility in September - Greenville, 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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