September weather forecast and climate
Mount Washington, NH

Weather in September

The first month of the autumn, September, is also an enjoyable month in Mount Washington, New Hampshire, with average temperature ranging between min 46.9°F (8.3°C) and max 66°F (18.9°C).

Temperature

In Mount Washington, New Hampshire, the average high-temperature in September slightly decreases, from a pleasant 73°F (22.8°C) in August, to a comfortable 66°F (18.9°C). In Mount Washington, in September, the average low-temperature is 46.9°F (8.3°C).

Humidity

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

Rainfall

The month with the least rainfall in Mount Washington is September when the rain falls for 10.6 days and typically collects 0.94" (24mm) of precipitation.

Snowfall

In Mount Washington snow does not fall in June through September.

Daylight

In Mount Washington, New Hampshire, the average length of the day is 12.5h.

Sunshine

In September, the average sunshine in Mount Washington is 8.3h.

UV index

In Mount Washington, the average daily maximum UV index in September 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 the ordinary person.
Note: In September, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. 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.
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FAQ

What is the average humidity in September in Mount Washington?

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

What is the driest month in Mount Washington?

The month with the least rainfall is September when the rain falls for 10.6 days and typically collects 0.94" (24mm) of precipitation.

How many days does it rain in September in Mount Washington?

In Mount Washington, New Hampshire, during September, the rain falls for 10.6 days and regularly aggregates up to 0.94" (24mm) of precipitation.

When it does not snow in Mount Washington?

In Mount Washington snow does not fall in June through September.

Does it snow in Mount Washington in September?

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

How many hours of daylight does Mount Washington have in September?

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

How long on average sun shines in September in Mount Washington?

In Mount Washington, the average sunshine in September is 8.3h.

What is the UV index reading in September in Mount Washington?

The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Mount Washington, NH

Average temperature in September - Mount Washington, NH
  • Average high temperature in September: 66°F

The warmest month (with the highest average high temperature) is July (75°F).
The month with the lowest average high temperature is January (21.7°F).

  • Average low temperature in September: 46.9°F

The month with the highest average low temperature is July (54.7°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).

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Average pressure in September
Mount Washington, NH

Average pressure in September - Mount Washington, NH
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is November (30.06").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Mount Washington, NH

Average wind speed in September - Mount Washington, NH
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is February (9.8mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).

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Average humidity in September
Mount Washington, NH

Average humidity in September - Mount Washington, NH
  • Average humidity in September: 80%

The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (77%).

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Average rainfall in September
Mount Washington, NH

Average rainfall in September - Mount Washington, NH
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is April (2.44").
The driest month (with the least rainfall) is September (0.94").

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Average rainfall days in September
Mount Washington, NH

Average rainfall days in September - Mount Washington, NH
  • Average rainfall days in September: 10.6 days

The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is November (8 days).

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Average snowfall in September
Mount Washington, NH

Average snowfall in September - Mount Washington, NH
  • Average snowfall in September: 0"

The month with the highest snowfall is January (11.42").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Mount Washington, NH

Average snowfall days in September - Mount Washington, NH
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (20.4 days).
Months with the least snowfall days are July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Mount Washington, NH

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

The month with the longest days is June (Average daylight: 15.5h).
The month with the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in September: 8.3h

The month with the most sunshine is August (Average sunshine: 9.8h).
The month with the least sunshine is February (Average sunshine: 3.5h).

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Average sunshine days in September
Mount Washington, NH

Average sunshine days in September - Mount Washington, NH
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is September (16.2 days).
The month with the least sunshine days is February (7.8 days).

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Average UV index in September
Mount Washington, NH

Average UV index in September - Mount Washington, NH
  • Average UV index in September: 3

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

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Average cloud cover in September
Mount Washington, NH

Average cloud cover in September - Mount Washington, NH
  • Average cloud cover in September: 41

The month with the most cloud cover is February (Cloud cover 64).
Months with the least cloud cover are July, August and September (Cloud cover 41).

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Average visibility in September
Mount Washington, NH

Average visibility in September - Mount Washington, NH
  • Average visibility in September: 4mi

Months with the highest visibility are May, June and July (5mi).
Months with the lowest visibility are January, February, March, April, August, September, October, November and December (4mi).

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