September weather forecast
Ennis, MT

Weather in September

September, the first month of the autumn, in Ennis, is still a comfortable month, with average temperature varying between 39.9°F (4.4°C) and 63.5°F (17.5°C).

Temperature

In September, the average high-temperature drops, from an agreeable 73°F (22.8°C) in August, to a comfortable 63.5°F (17.5°C). In September, the average low-temperature is 39.9°F (4.4°C).

Humidity

In Ennis, Montana, the average relative humidity in September is 56%.

Rainfall

In Ennis, it is raining for 10.3 days, with typically 1.61" (41mm) of accumulated precipitation. In Ennis, during the entire year, the rain falls for 105.7 days and collects up to 17.99" (457mm) of precipitation.

Snowfall

January through December are months with snowfall. In September, in Ennis, it is snowing for 3.9 days. Throughout September, 4.37" (111mm) of snow is accumulated. Throughout the year, there are 136.1 snowfall days, and 86.93" (2208mm) of snow is accumulated.

Daylight

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

Sunshine

In Ennis, the average sunshine in September is 9.7h.

UV index

In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 3 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. A wide-brim hat offers excellent sun protection for 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Ennis?

In September, the average relative humidity in Ennis, Montana, is 56%.

How many days does it rain in September in Ennis?

In Ennis, during September, the rain falls for 10.3 days and regularly aggregates up to 1.61" (41mm) of precipitation.

How many days does it snow in September in Ennis?

In Ennis, Montana, in September, during 3.9 snowfall days, 4.37" (111mm) of snow is typically accumulated.

How many hours of daylight does Ennis have in September?

In September, the average length of the day in Ennis is 12.5h.

How many hours of sunshine does Ennis have in September?

In September, the average sunshine in Ennis is 9.7h.

What is the UV index intensity in September in Ennis?

In Ennis, Montana, the average daily maximum UV index in September is 3. 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
Ennis, MT

Average temperature in September - Ennis, MT
  • Average high temperature in September: 63.5°F

The warmest month (with the highest average high temperature) is July (74.5°F).
The month with the lowest average high temperature is December (22.3°F).

  • Average low temperature in September: 39.9°F

The month with the highest average low temperature is August (46°F).
The coldest month (with the lowest average low temperature) is December (7.7°F).

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Average pressure in September
Ennis, MT

Average pressure in September - Ennis, MT
  • Average pressure in September: 29.99"

The month with the highest atmospheric pressure is January (30.22").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Ennis, MT

Average wind speed in September - Ennis, MT
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in September
Ennis, MT

Average humidity in September - Ennis, MT
  • Average humidity in September: 56%

The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is August (50%).

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Average rainfall in September
Ennis, MT

Average rainfall in September - Ennis, MT
  • Average rainfall in September: 1.61"

The wettest month (with the highest rainfall) is May (2.36").
The driest month (with the least rainfall) is December (0.75").

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Average rainfall days in September
Ennis, MT

Average rainfall days in September - Ennis, MT
  • Average rainfall days in September: 10.3 days

The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is November (2.9 days).

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Average snowfall in September
Ennis, MT

Average snowfall in September - Ennis, MT
  • Average snowfall in September: 4.37"

The month with the highest snowfall is April (14.76").
The month with the least snowfall is August (0.08").

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Average snowfall days in September
Ennis, MT

Average snowfall days in September - Ennis, MT
  • Average snowfall days in September: 3.9 days

The month with the highest number of snowfall days is April (19.9 days).
The month with the least snowfall days is August (0.3 days).

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Average daylight in September /
Average sunshine in September
Ennis, MT

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

The month with the longest days is June (Average daylight: 15.6h).
The month with the shortest days is December (Average daylight: 8.8h).

  • Average sunshine in September: 9.7h

The month with the most sunshine is July (Average sunshine: 11.6h).
The month with the least sunshine is January (Average sunshine: 4.7h).

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Average sunshine days in September
Ennis, MT

Average sunshine days in September - Ennis, MT
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is January (16.3 days).
The month with the least sunshine days is April (6.9 days).

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Average UV index in September
Ennis, MT

Average UV index in September - Ennis, MT
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 5).
Months with the lowest UV index are January and February (UV index 1).

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Average cloud cover in September
Ennis, MT

Average cloud cover in September - Ennis, MT
  • Average cloud cover in September: 23

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 17).

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Average visibility in September
Ennis, MT

Average visibility in September - Ennis, MT
  • Average visibility in September: 6mi

Months with the highest visibility are June, July, August, September and October (6mi).
Months with the lowest visibility are January, February and December (4mi).

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