September weather forecast and climate
Plentywood, MT

September, the first month of the autumn, in Plentywood, is also an agreeable month, with temperature in the range of an average high of 70°F (21.1°C) and an average low of 52.3°F (11.3°C).

Temperature

In September, the average high-temperature drops, from a moderately hot 81.3°F (27.4°C) in August, to an agreeable 70°F (21.1°C). In September, in Plentywood, the average low-temperature is 52.3°F (11.3°C).

Humidity

In Plentywood, the average relative humidity in September is 50%.

Rainfall

In Plentywood, in September, during 8.6 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Plentywood, during the entire year, the rain falls for 93.3 days and collects up to 12.01" (305mm) of precipitation.

Snowfall

In Plentywood snow does not fall in June through September.

Daylight

In Plentywood, the average length of the day in September is 12.6h.

Sunshine

In Plentywood, the average sunshine in September is 9.9h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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.

What is the temperature in September in Plentywood?

The average high-temperature, in September, in Plentywood, is 70°F (21.1°C), while the average low-temperature is 52.3°F (11.3°C).

What is the average humidity in September in Plentywood?

In September, the average relative humidity is 50%.

How much does it rain in Plentywood in September?

In Plentywood, Montana, in September, during 8.6 rainfall days, 1.5" (38mm) of precipitation is typically accumulated.

Does it snow in Plentywood in September?

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

When it does not snow in Plentywood?

June through September are months without snowfall in Plentywood, Montana.

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

In Plentywood, the average length of the day in September is 12.6h.

How long on average sun shines in September in Plentywood?

In September, the average sunshine in Plentywood, Montana, is 9.9h.

How high is the UV index in September in Plentywood?

The average daily maximum UV index in September in Plentywood is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in September - Plentywood, MT
  • Average high temperature in September: 21.1°C

The warmest month (with the highest average high temperature) is July (27.8°C).
The month with the lowest average high temperature is February (-6.8°C).

  • Average low temperature in September: 11.3°C

The month with the highest average low temperature is July (16.1°C).
The coldest month (with the lowest average low temperature) is February (-14.3°C).

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

The month with the highest atmospheric pressure is February (1021.6mbar).
The month with the lowest atmospheric pressure is June (1010.2mbar).

Average wind speed in September - Plentywood, MT
  • Average wind speed in September: 16.4km/h

The windiest month (with the highest average wind speed) is April (17.8km/h).
The calmest month (with the lowest average wind speed) is February (14.8km/h).

Average humidity in September - Plentywood, MT
  • Average humidity in September: 50%

Months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is August (46%).

Average rainfall in September - Plentywood, MT
  • Average rainfall in September: 38mm

The wettest month (with the highest rainfall) is June (55mm).
The driest month (with the least rainfall) is February (12mm).

Average rainfall days in September - Plentywood, MT
  • Average rainfall days in September: 8.6 days

The month with the highest number of rainy days is June (13.9 days).
The month with the least rainy days is February (2.6 days).

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

The month with the highest snowfall is November (95mm).
Months with the least snowfall are June, July, August and September (0mm).

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

The month with the highest number of snowfall days is February (13.5 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Plentywood, MT
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in September: 9.9h

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is February (Average sunshine: 3.9h).

Average sunshine days in September - Plentywood, MT
  • Average sunshine days in September: 19.6 days

The month with the most sunshine days is August (20.1 days).
Months with the least sunshine days are February and June (13.8 days).

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

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).

Average cloud cover in September - Plentywood, MT
  • Average cloud cover in September: 26

The month with the most cloud cover is February (Cloud cover 60).
Months with the least cloud cover are July and August (Cloud cover 19).

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

Months with the highest visibility are May, June, July, August, September and October (10km).
Months with the lowest visibility are January, February, March and December (8km).