September weather forecast
Sidney, MT

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Weather in September

In Sidney, September brings with it a decline in temperatures as the summer makes way for fall. Despite the shorter days, the city still benefits from 10 hours of sunshine on average. Residents begin to witness a scenic transformation as leaves change into autumn colors. At 72.3°F (22.4°C), September carries a crispness to the air, indicating the onset of another seasonal shift. Evening walks become more prevalent as the weather starts to cool down.

Temperature

The shift from August to September involves a decrease in the average high-temperature, from a moderately hot 82.8°F (28.2°C) to a pleasant 72.3°F (22.4°C). During September, the nighttime temperature averages to a cool 54.3°F (12.4°C).

Humidity

The average relative humidity in September in Sidney is 48%.

Rainfall

In September, the rain falls for 7.5 days. Throughout September, 1.06" (27mm) of precipitation is accumulated. Throughout the year, there are 85.7 rainfall days, and 8.5" (216mm) of precipitation is accumulated.

Snowfall

In Sidney, snow does not fall in June through September.

Daylight

In September, the average length of the day is 12h and 33min.
On the first day of September, sunrise is at 6:16 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:37 pm MDT.

Sunshine

The average sunshine in September is 10h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
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Frequently asked questions

What is the usual temperature for Sidney in September?

In Sidney, in September, the average high-temperature is 72.3°F (22.4°C), and the average low-temperature is 54.3°F (12.4°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in August is evaluated at 82.4°F (28°C).

What is the average humidity in September in Sidney?

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

How much does it rain in Sidney in September?

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

When it does not snow in Sidney?

June through September are months without snowfall.

Does it snow in Sidney in September?

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

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

In September, the average day length in Sidney, Montana, is 12h and 33min.

When are sunrise and sunset in September in Sidney?

In September, on the first day of the month, sunrise is at 6:16 am and sunset at 7:36 pm. On the last day of the month, in Sidney, Montana, sunrise is at 6:55 am and sunset at 6:37 pm MDT.

How many hours of sunshine does Sidney have in September?

The average sunshine duration in September in Sidney, Montana, is 10h.

How high is the UV index in September in Sidney?

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Sidney, MT

Average temperature in September - Sidney, MT
  • Average high temperature in September: 72.3°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (23.4°F).

  • Average low temperature in September: 54.3°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).

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Average pressure in September
Sidney, MT

Average pressure in September - Sidney, MT
  • Average pressure in September: 29.93"Hg

The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).

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Average wind speed in September
Sidney, MT

Average wind speed in September - Sidney, MT
  • Average wind speed in September: 10.3mph

The windiest months (with the highest average wind speed) are April and October (11.1mph).
The calmest month (with the lowest average wind speed) is February (9.2mph).

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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: 1.06"

The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is January (0.24").

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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: 0"

The month with the highest snowfall is February (1.77").
The months with the least snowfall are June, July, August and September (0").

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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: 12h and 4min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 10h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

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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: 6mi

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

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Sidney, Montana, USA

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