October weather forecast
Sidney, MT

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Weather in October

By October, the full glory of the fall season is witnessed in Sidney. Colorful trees adorn the city streets, creating a picturesque environment. The drop in temperature continues with the prevalence of crisp, refreshing mornings and evenings. Residents prepare for harsher weather conditions as snowfall makes a reappearance of 0.31" (8mm). The transition into winter becomes apparent as the days continue to shorten.

Temperature

October in Sidney is marked by a distinct decrease in the average high-temperature, falling from a pleasant 72.3°F (22.4°C) in September to a cool 55°F (12.8°C). Sidney records a mean low-temperature of 39.9°F (4.4°C) in October.

Humidity

In October, the average relative humidity is 59%.

Rainfall

In Sidney, during October, the rain falls for 6.5 days and regularly aggregates up to 0.51" (13mm) of precipitation. Throughout the year, there are 85.7 rainfall days, and 8.5" (216mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. October is the first month it typically snows. Throughout October, in the average 2.4 snowfall days, it receives 0.31" (8mm) of snow. In Sidney, during the entire year, snow falls for 56.1 days and aggregates up to 8.94" (227mm) of snow.

Daylight

In Sidney, the average length of the day in October is 10h and 50min.
On the first day of the month, sunrise is at 6:56 am and sunset at 6:35 pm. On the last day of October, sunrise is at 7:40 am and sunset at 5:39 pm MDT.

Sunshine

In Sidney, the average sunshine in October is 6.2h.

UV index

In October, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: In October, the maximum UV index of 2 transforms into these recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. When the Sun is at its strongest around midday, find shade and limit exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Updated: Jun 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Sidney in October?

The high-temperature, in October, in Sidney, records 55°F (12.8°C), while the low-temperature is 39.9°F (4.4°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, is calculated to be 82.4°F (28°C).

What is the average humidity in October?

In Sidney, the average relative humidity in October is 59%.

How much does it rain in October?

In Sidney, in October, during 6.5 rainfall days, 0.51" (13mm) of precipitation is typically accumulated.

When does it start to snow?

October is the first month it typically snows. Throughout October, in the average 2.4 snowfall days, it receives 0.31" (8mm) of snow.

How many hours of daylight does Sidney have in October?

The average day length in October is 10h and 50min.

When is the sunrise / sunset in October?

On the first day of October, sunrise is at 6:56 am and sunset at 6:35 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 5:39 pm MDT.

How many hours of sunshine does Sidney have in October?

In October, the average sunshine duration is 6.2h.

What is the UV index reading in October?

The average daily maximum UV index in October is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
Sidney, MT

Average temperature in October - Sidney, MT
  • Average high temperature in October: 55°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 October: 39.9°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).

Average pressure in October
Sidney, MT

Average pressure in October - Sidney, MT
  • Average pressure in October: 29.97"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).

Average wind speed in October
Sidney, MT

Average wind speed in October - Sidney, MT
  • Average wind speed in October: 11.1mph

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).

Average humidity in October
Sidney, MT

Average humidity in October - Sidney, MT
  • Average humidity in October: 59%

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

Average rainfall in October
Sidney, MT

Average rainfall in October - Sidney, MT
  • Average rainfall in October: 0.51"

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

Average rainfall days in October
Sidney, MT

Average rainfall days in October - Sidney, MT
  • Average rainfall days in October: 6.5 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).

Average snowfall in October
Sidney, MT

Average snowfall in October - Sidney, MT
  • Average snowfall in October: 0.31"

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

Average snowfall days in October
Sidney, MT

Average snowfall days in October - Sidney, MT
  • Average snowfall days in October: 2.4 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).

Average daylight in October /
Average sunshine in October
Sidney, MT

Average daylight in October / Average sunshine in October - Sidney, MT
  • Average daylight in October: 10h and 5min

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 October: 6h and 1min

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).

Average sunshine days in October
Sidney, MT

Average sunshine days in October - Sidney, MT
  • Average sunshine days in October: 20.5 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).

Average UV index in October
Sidney, MT

Average UV index in October - Sidney, MT
  • Average UV index in October: 2

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).

Average cloud cover in October
Sidney, MT

Average cloud cover in October - Sidney, MT
  • Average cloud cover in October: 34

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

Average visibility in October
Sidney, MT

Average visibility in October - Sidney, MT
  • Average visibility in October: 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).

Sidney, Montana, USA

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