September weather forecast and climate
Bethlehem, NH

The first month of the autumn, September, is still a comfortable month in Bethlehem, New Hampshire, with average temperature varying between 66.9°F (19.4°C) and 46.8°F (8.2°C).

Temperature

In Bethlehem, New Hampshire, the average high-temperature marginally drops, from a moderately hot 74.1°F (23.4°C) in August, to an enjoyable 66.9°F (19.4°C). In Bethlehem, the average low-temperature is 46.8°F (8.2°C).

Humidity

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

Rainfall

The month with the least rainfall in Bethlehem is September when the rain falls for 12.5 days and typically collects 2.09" (53mm) of precipitation.

Snowfall

June through September are months without snowfall in Bethlehem.

Daylight

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

Sunshine

The average sunshine in Bethlehem is 8.4h.

UV index

In September, the average daily maximum UV index in Bethlehem is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 3 transform into the following instructions:
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 Bethlehem?

The average high-temperature, in September, in Bethlehem, New Hampshire, is 66.9°F (19.4°C), while the average low-temperature is 46.8°F (8.2°C).

What is the average humidity in September in Bethlehem?

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

How many days does it rain in September in Bethlehem?

In September, in Bethlehem, the rain falls for 12.5 days. Throughout September, 2.09" (53mm) of precipitation is accumulated.

What is the driest month in Bethlehem?

September is the month with the least rainfall. Rain falls for 12.5 days and accumulates 2.09" (53mm) of precipitation.

Does it snow in Bethlehem in September?

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

When it does not snow in Bethlehem?

June through September are months without snowfall in Bethlehem, New Hampshire.

What is the average length of the day in September in Bethlehem?

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

How long on average sun shines in September in Bethlehem?

The average sunshine in September is 8.4h.

How high is the UV index in September in Bethlehem?

In Bethlehem, New Hampshire, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.
Average temperature in September - Bethlehem, NH
  • Average high temperature in September: 19.4°C

The warmest month (with the highest average high temperature) is July (24.6°C).
The month with the lowest average high temperature is January (-5.3°C).

  • Average low temperature in September: 8.2°C

The month with the highest average low temperature is July (12.3°C).
The coldest month (with the lowest average low temperature) is January (-12.6°C).

Average pressure in September - Bethlehem, NH
  • Average pressure in September: 1017.5mbar

The month with the highest atmospheric pressure is November (1018.1mbar).
The month with the lowest atmospheric pressure is June (1012.8mbar).

Average wind speed in September - Bethlehem, NH
  • Average wind speed in September: 7.7km/h

The windiest month (with the highest average wind speed) is April (10.5km/h).
The calmest month (with the lowest average wind speed) is August (7.3km/h).

Average humidity in September - Bethlehem, NH
  • Average humidity in September: 80%

Months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (76%).

Average rainfall in September - Bethlehem, NH
  • Average rainfall in September: 53mm

The wettest month (with the highest rainfall) is October (74mm).
The driest month (with the least rainfall) is September (53mm).

Average rainfall days in September - Bethlehem, NH
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (6.7 days).

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

The month with the highest snowfall is February (345mm).
Months with the least snowfall are June, July, August and September (0mm).

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

The month with the highest number of snowfall days is January (21.1 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Bethlehem, 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: 8.4h

The month with the most sunshine is August (Average sunshine: 9.9h).
The month with the least sunshine is February (Average sunshine: 3h).

Average sunshine days in September - Bethlehem, NH
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is February (5.9 days).

Average UV index in September - Bethlehem, 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 January, February and December (UV index 1).

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

The month with the most cloud cover is February (Cloud cover 71).
Months with the least cloud cover are July and August (Cloud cover 39).

Average visibility in September - Bethlehem, NH
  • Average visibility in September: 7km

Months with the highest visibility are April, May, June, July, August, October and November (8km).
Months with the lowest visibility are January and February (6km).