September weather forecast
Smelterville, ID

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Weather in September

The first month of the autumn, September, is also an agreeable month in Smelterville, Idaho, with an average temperature varying between 41.9°F (5.5°C) and 68.7°F (20.4°C).

Temperature

The arrival of September indicates a decrease in the average high-temperature, moving from a warm 78.4°F (25.8°C) in August to a pleasant 68.7°F (20.4°C). Smelterville documents a substantial shift from daytime warmth, recording an average nighttime temperature of 41.9°F (5.5°C) in September.

Humidity

In Smelterville, Idaho, the average relative humidity in September is 62%.

Rainfall

In September, in Smelterville, the rain falls for 9 days. Throughout September, 0.94" (24mm) of precipitation is accumulated. In Smelterville, during the entire year, the rain falls for 140.1 days and collects up to 22.2" (564mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Smelterville. September is the first month it typically snows in Smelterville. Throughout September, in the average 0.2 snowfall days, it receives 0.43" (11mm) of snow. Throughout the year, in Smelterville, there are 57.8 snowfall days, and 45.31" (1151mm) of snow is accumulated.

Daylight

In Smelterville, the average length of the day in September is 12h and 33min.
On the first day of the month, sunrise is at 6:04 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:43 am and sunset at 6:25 pm PDT.

Sunshine

The average sunshine in September is 9.5h.

UV index

The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 3 during September leads to these advisories:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. It's recommended to limit sun exposure when its radiation is at its peak during midday. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
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Frequently asked questions

What is the average September temperature in Smelterville?

An average high-temperature, in September, in Smelterville, is 68.7°F (20.4°C) and the average low-temperature is 41.9°F (5.5°C).

What is the average humidity in September in Smelterville?

In September, the average relative humidity in Smelterville is 62%.

How much does it rain in Smelterville in September?

In Smelterville, in September, during 9 rainfall days, 0.94" (24mm) of precipitation is typically accumulated.

When does it start to snow in Smelterville?

September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.43" (11mm) of snow.

How many hours of daylight does Smelterville have in September?

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

When are sunrise and sunset in September in Smelterville?

On the first day of September in Smelterville, Idaho, sunrise is at 6:04 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:25 pm PDT.

How long on average sun shines in September in Smelterville?

The average sunshine duration in September is 9.5h.

What is the UV index reading in September in Smelterville?

The average daily maximum UV index in September in Smelterville is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
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 September
Smelterville, ID

Average temperature in September - Smelterville, ID
  • Average high temperature in September: 68.7°F

The warmest month (with the highest average high temperature) is August (78.4°F).
The month with the lowest average high temperature is December (30.4°F).

  • Average low temperature in September: 41.9°F

The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (19.8°F).

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Average pressure in September
Smelterville, ID

Average pressure in September - Smelterville, ID
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).

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Average wind speed in September
Smelterville, ID

Average wind speed in September - Smelterville, ID
  • Average wind speed in September: 4mph

The windiest month (with the highest average wind speed) is April (4.8mph).
The calmest months (with the lowest average wind speed) are September and December (4mph).

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Average humidity in September
Smelterville, ID

Average humidity in September - Smelterville, ID
  • Average humidity in September: 62%

The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is August (52%).

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Average rainfall in September
Smelterville, ID

Average rainfall in September - Smelterville, ID
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is January (2.8").
The driest month (with the least rainfall) is July (0.51").

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Average rainfall days in September
Smelterville, ID

Average rainfall days in September - Smelterville, ID
  • Average rainfall days in September: 9 days

The month with the highest number of rainy days is March (17.8 days).
The month with the least rainy days is August (6.3 days).

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Average snowfall in September
Smelterville, ID

Average snowfall in September - Smelterville, ID
  • Average snowfall in September: 0.43"

The month with the highest snowfall is January (12.36").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Smelterville, ID

Average snowfall days in September - Smelterville, ID
  • Average snowfall days in September: 0.2 days

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

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Average daylight in September /
Average sunshine in September
Smelterville, ID

Average daylight in September / Average sunshine in September - Smelterville, ID
  • Average daylight in September: 12h and 3min

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: 9h and 3min

The month with the most sunshine is August (Average sunshine: 11h and 48min).
The months with the least sunshine are January and December (Average sunshine: 3h and 36min).

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Average sunshine days in September
Smelterville, ID

Average sunshine days in September - Smelterville, ID
  • Average sunshine days in September: 19.6 days

The month with the most sunshine days is July (22.9 days).
The month with the least sunshine days is March (8.7 days).

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Average UV index in September
Smelterville, ID

Average UV index in September - Smelterville, ID
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in September
Smelterville, ID

Average cloud cover in September - Smelterville, ID
  • Average cloud cover in September: 25

The months with the most cloud cover are January, February and December (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 14).

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Average visibility in September
Smelterville, ID

Average visibility in September - Smelterville, ID
  • Average visibility in September: 6mi

The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (3mi).

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Smelterville, Idaho, USA

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