September weather forecast
Sidney, MT

Weather in September

September, the first month of the autumn, in Sidney, is also an agreeable month, with average temperature fluctuating between 72.3°F (22.4°C) and 54.3°F (12.4°C).

Temperature

In September, the average high-temperature drops, from a warm 82.8°F (28.2°C) in August, to an agreeable 72.3°F (22.4°C). In September, in Sidney, the average low-temperature is 54.3°F (12.4°C).

Humidity

In Sidney, the average relative humidity in September is 48%.

Rainfall

In Sidney, it is raining for 7.5 days, with typically 1.06" (27mm) of accumulated precipitation. Throughout the year, in Sidney, there are 85.7 rainfall days, and 8.5" (216mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

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

Sunshine

In Sidney, the average sunshine is 10h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 4 transform into the following instructions:
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. 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.
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FAQ

What is the average humidity in September in Sidney?

In Sidney, the average relative humidity in September is 48%.

How much does it rain in Sidney in September?

In Sidney, Montana, in September, during 7.5 rainfall days, 1.06" (27mm) of precipitation is typically accumulated.

When it does not snow in Sidney?

In Sidney snow does not fall in June through September.

Does it snow in Sidney in September?

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

How many hours of daylight does Sidney have in September?

The average length of the day in September in Sidney, Montana, is 12.5h.

How many hours of sunshine does Sidney have in September?

In September, the average sunshine in Sidney, Montana, is 10h.

How high is the UV index in September in Sidney?

In Sidney, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in September
Sidney, MT

Average temperature in September - Sidney, MT
  • Average high temperature in September: 22.4°C

The warmest month (with the highest average high temperature) is July (29°C).
The month with the lowest average high temperature is January (-4.8°C).

  • Average low temperature in September: 12.4°C

The month with the highest average low temperature is July (17.2°C).
The coldest month (with the lowest average low temperature) is January (-12.3°C).

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Average pressure in September
Sidney, MT

Average pressure in September - Sidney, MT
  • Average pressure in September: 1013.5mbar

The month with the highest atmospheric pressure is February (1021.5mbar).
The month with the lowest atmospheric pressure is June (1010.3mbar).

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Average wind speed in September
Sidney, MT

Average wind speed in September - Sidney, MT
  • Average wind speed in September: 16.6km/h

The windiest month (with the highest average wind speed) is April (17.9km/h).
The calmest month (with the lowest average wind speed) is February (14.8km/h).

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Average humidity in September
Sidney, MT

Average humidity in September - Sidney, MT
  • Average humidity in September: 48%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (45%).

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Average rainfall in September
Sidney, MT

Average rainfall in September - Sidney, MT
  • Average rainfall in September: 27mm

The wettest month (with the highest rainfall) is July (34mm).
The driest month (with the least rainfall) is January (6mm).

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Average rainfall days in September
Sidney, MT

Average rainfall days in September - Sidney, MT
  • Average rainfall days in September: 7.5 days

The month with the highest number of rainy days is June (11.4 days).
The months with the least rainy days are January and February (3.2 days).

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Average snowfall in September
Sidney, MT

Average snowfall in September - Sidney, MT
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (45mm).
The months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in September
Sidney, MT

Average snowfall days in September - Sidney, MT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (12 days).
The 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
Sidney, MT

Average daylight in September / Average sunshine in September - Sidney, MT
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 10h

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is February (Average sunshine: 4.3h).

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Average sunshine days in September
Sidney, MT

Average sunshine days in September - Sidney, MT
  • Average sunshine days in September: 20.7 days

The month with the most sunshine days is September (20.7 days).
The month with the least sunshine days is April (15.8 days).

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Average UV index in September
Sidney, MT

Average UV index in September - Sidney, MT
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and February (UV index 1).

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Average cloud cover in September
Sidney, MT

Average cloud cover in September - Sidney, MT
  • Average cloud cover in September: 24

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 18).

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Average visibility in September
Sidney, MT

Average visibility in September - Sidney, MT
  • Average visibility in September: 10km

The months with the highest visibility are May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, November and December (9km).

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