September weather forecast
Alder, MT

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Weather in September

September, the first month of the autumn in Alder, is also an enjoyable month, with an average temperature fluctuating between 67.6°F (19.8°C) and 41.2°F (5.1°C).

Temperature

Alder, Montana, in September undergoes a mild reduction in the average high-temperature, shifting from August's warm 78.3°F (25.7°C) to a refreshing 67.6°F (19.8°C). During September, Alder's temperature records a considerable difference from its daily highs to an average low of 41.2°F (5.1°C).

Humidity

In September, the average relative humidity in Alder is 52%.

Rainfall

In Alder, Montana, during September, the rain falls for 10.3 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Alder, during the entire year, the rain falls for 158 days and collects up to 12.2" (310mm) of precipitation.

Snowfall

In Alder, snow does not fall in May through September.

Daylight

In Alder, the average length of the day in September is 12h and 31min.
On the first day of the month, sunrise is at 6:51 am and sunset at 8:05 pm. On the last day of September, in Alder, sunrise is at 7:26 am and sunset at 7:09 pm MDT.

Sunshine

The average sunshine in September is 9.8h.

UV index

In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In September, a daily UV index of 3 turns into the following recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
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Frequently asked questions

What are the temperatures in Alder in September?

The high-temperature in Alder, Montana, during September is 67.6°F (19.8°C) and the low-temperature is 41.2°F (5.1°C).

What is the average humidity in September in Alder?

In September, the average relative humidity in Alder, Montana, is 52%.

How many days does it rain in September in Alder?

In Alder, in September, during 10.3 rainfall days, 0.98" (25mm) of precipitation is typically accumulated.

When it does not snow in Alder?

May through September are months without snowfall in Alder.

Does it snow in Alder in September?

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

How many hours of daylight does Alder have in September?

The average day length in September in Alder, Montana, is 12h and 31min.

When is the sunrise / sunset in September in Alder?

On the first day of September in Alder, sunrise is at 6:51 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:09 pm MDT.

How many hours of sunshine does Alder have in September?

In September, the average sunshine duration in Alder, Montana, is 9.8h.

How high is the UV index in September in Alder?

The average daily maximum UV index in September in Alder, Montana, is 3. A UV Index estimate 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
Alder, MT

Average temperature in September - Alder, MT
  • Average high temperature in September: 67.6°F

The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is December (26.4°F).

  • Average low temperature in September: 41.2°F

The month with the highest average low temperature is July (47.7°F).
The coldest month (with the lowest average low temperature) is December (11.3°F).

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Average pressure in September
Alder, MT

Average pressure in September - Alder, MT
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Alder, MT

Average wind speed in September - Alder, MT
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is November (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

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Average humidity in September
Alder, MT

Average humidity in September - Alder, MT
  • Average humidity in September: 52%

The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (46%).

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Average rainfall in September
Alder, MT

Average rainfall in September - Alder, MT
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is May (1.85").
The driest month (with the least rainfall) is January (0.59").

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Average rainfall days in September
Alder, MT

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

The month with the highest number of rainy days is April (18.6 days).
The month with the least rainy days is August (8.6 days).

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Average snowfall in September
Alder, MT

Average snowfall in September - Alder, MT
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.81").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Alder, MT

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

The month with the highest number of snowfall days is February (6.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Alder, MT
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in September: 9h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in September
Alder, MT

Average sunshine days in September - Alder, MT
  • Average sunshine days in September: 16.4 days

The month with the most sunshine days is July (17.8 days).
The month with the least sunshine days is April (7.8 days).

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Average UV index in September
Alder, MT

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

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in September
Alder, MT

Average cloud cover in September - Alder, MT
  • Average cloud cover in September: 19

The month with the most cloud cover is February (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 14).

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Average visibility in September
Alder, MT

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

The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).

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Alder, Montana, USA

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