September weather forecast
Newcastle, WY

Weather in September

September, the first month of the autumn in Newcastle, is still a pleasant month, with temperature in the range of an average high of 68.5°F (20.3°C) and an average low of 48.2°F (9°C).

Temperature

In Newcastle, the average high-temperature in September marginally drops from a moderately hot 77.2°F (25.1°C) in August to a pleasant 68.5°F (20.3°C). In September, the average low-temperature is 48.2°F (9°C).

Humidity

The average relative humidity in September in Newcastle is 54%.

Rainfall

In Newcastle, Wyoming, during September, the rain falls for 10 days and regularly aggregates up to 1.26" (32mm) of precipitation. In Newcastle, during the entire year, the rain falls for 123.2 days and collects up to 19.37" (492mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall in Newcastle, Wyoming. September is the first month it typically snows. Throughout September, in the average 0.8 snowfall days, it receives 0.59" (15mm) of snow. In Newcastle, during the entire year, snow falls for 80.3 days and aggregates up to 41.38" (1051mm) of snow.

Daylight

The average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:20 am and sunset at 7:32 pm. On the last day of September, in Newcastle, sunrise is at 6:53 am and sunset at 6:39 pm MDT.

Sunshine

The average sunshine in September is 10.6h.

UV index

In September, the average daily maximum UV index in Newcastle is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Newcastle?

In September, the average high-temperature is 68.5°F (20.3°C), and the average low-temperature is 48.2°F (9°C).

What is the average humidity in September in Newcastle?

In September, the average relative humidity in Newcastle, Wyoming, is 54%.

How many days does it rain in September in Newcastle?

In Newcastle, in September, during 10 rainfall days, 1.26" (32mm) of precipitation is typically accumulated.

When does it start to snow in Newcastle?

September is the first month it typically snows in Newcastle. Throughout September, in the average 0.8 snowfall days, it receives 0.59" (15mm) of snow.

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

In September, the average day length is 12h and 29min.

When are sunrise and sunset in September in Newcastle?

On the first day of September, sunrise is at 6:20 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:39 pm MDT.

How long on average sun shines in September in Newcastle?

In Newcastle, the average sunshine duration in September is 10.6h.

What is the UV index intensity in September in Newcastle?

In September, the average daily maximum UV index in Newcastle is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Newcastle, WY

Average temperature in September - Newcastle, WY
  • Average high temperature in September: 68.5°F

The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is December (26.2°F).

  • Average low temperature in September: 48.2°F

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is February (10.8°F).

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Average pressure in September
Newcastle, WY

Average pressure in September - Newcastle, WY
  • Average pressure in September: 29.93"Hg

The months with the highest atmospheric pressure are January and December (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in September
Newcastle, WY

Average wind speed in September - Newcastle, WY
  • Average wind speed in September: 8.7mph

The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (7.8mph).

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Average humidity in September
Newcastle, WY

Average humidity in September - Newcastle, WY
  • Average humidity in September: 54%

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (53%).

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Average rainfall in September
Newcastle, WY

Average rainfall in September - Newcastle, WY
  • Average rainfall in September: 1.26"

The wettest months (with the highest rainfall) are June and July (2.68").
The driest month (with the least rainfall) is December (0.67").

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Average rainfall days in September
Newcastle, WY

Average rainfall days in September - Newcastle, WY
  • Average rainfall days in September: 10 days

The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (3.7 days).

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Average snowfall in September
Newcastle, WY

Average snowfall in September - Newcastle, WY
  • Average snowfall in September: 0.59"

The month with the highest snowfall is April (8.82").
The months with the least snowfall are July and August (0").

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Average snowfall days in September
Newcastle, WY

Average snowfall days in September - Newcastle, WY
  • Average snowfall days in September: 0.8 days

The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Newcastle, WY

Average daylight in September / Average sunshine in September - Newcastle, WY
  • Average daylight in September: 12h and 29min

The month with the longest days is June (Average daylight: 15h and 25min).
The month with the shortest days is December (Average daylight: 8h and 58min).

  • Average sunshine in September: 10h and 36min

The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).

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Average sunshine days in September
Newcastle, WY

Average sunshine days in September - Newcastle, WY
  • Average sunshine days in September: 15.4 days

The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is June (9.7 days).

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Average UV index in September
Newcastle, WY

Average UV index in September - Newcastle, WY
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in September
Newcastle, WY

Average cloud cover in September - Newcastle, WY
  • Average cloud cover in September: 18

The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 17).

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Average visibility in September
Newcastle, WY

Average visibility in September - Newcastle, WY
  • Average visibility in September: 6mi

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

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