September weather forecast and climate
Pierce, ID

Weather in September

The first month of the autumn, September, is still a warm month in Pierce, Idaho, with average temperature varying between 48°F (8.9°C) and 73.9°F (23.3°C).

Temperature

In Pierce, the average high-temperature in September decreases, from 84.7°F (29.3°C) in August, to a still warm 73.9°F (23.3°C). In Pierce, in September, the average low-temperature is 48°F (8.9°C).

Humidity

In Pierce, the average relative humidity in September is 53%.

Rainfall

In Pierce, during September, the rain falls for 7.2 days and regularly aggregates up to 0.71" (18mm) of precipitation. Throughout the year, in Pierce, Idaho, there are 146.2 rainfall days, and 21.65" (550mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

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

Sunshine

In September, the average sunshine is 9.9h.

UV index

In Pierce, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Pierce?

In Pierce, Idaho, the average relative humidity in September is 53%.

How many days does it rain in September in Pierce?

In Pierce, Idaho, in September, during 7.2 rainfall days, 0.71" (18mm) of precipitation is typically accumulated.

When it does not snow in Pierce?

In Pierce snow does not fall in May through September.

Does it snow in Pierce in September?

In Pierce, Idaho, in September, it doesn't snow. In October, it regularly snows.

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

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

How many hours of sunshine does Pierce have in September?

The average sunshine in September is 9.9h.

What is the UV index reading in September in Pierce?

In September, the average daily maximum UV index in Pierce, Idaho, is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.

Average temperature in September
Pierce, ID

Average temperature in September - Pierce, ID
  • Average high temperature in September: 73.9°F

The warmest month (with the highest average high temperature) is August (84.7°F).
The month with the lowest average high temperature is December (34.2°F).

  • Average low temperature in September: 48°F

The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (22.8°F).

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Average pressure in September
Pierce, ID

Average pressure in September - Pierce, ID
  • Average pressure in September: 29.97"

The month with the highest atmospheric pressure is January (30.2").
Months with the lowest atmospheric pressure are June and August (29.93").

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Average wind speed in September
Pierce, ID

Average wind speed in September - Pierce, ID
  • Average wind speed in September: 3.7mph

The windiest month (with the highest average wind speed) is April (4.6mph).
The calmest month (with the lowest average wind speed) is September (3.7mph).

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Average humidity in September
Pierce, ID

Average humidity in September - Pierce, ID
  • Average humidity in September: 53%

The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (46%).

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Average rainfall in September
Pierce, ID

Average rainfall in September - Pierce, ID
  • Average rainfall in September: 0.71"

The wettest months (with the highest rainfall) are January and March (2.8").
The driest month (with the least rainfall) is August (0.31").

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Average rainfall days in September
Pierce, ID

Average rainfall days in September - Pierce, ID
  • Average rainfall days in September: 7.2 days

The month with the highest number of rainy days is March (19 days).
The month with the least rainy days is August (4.4 days).

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Average snowfall in September
Pierce, ID

Average snowfall in September - Pierce, ID
  • Average snowfall in September: 0"

The month with the highest snowfall is February (6.57").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Pierce, ID

Average snowfall days in September - Pierce, ID
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is December (10.8 days).
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
Pierce, ID

Average daylight in September / Average sunshine in September - Pierce, ID
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.7h).

  • Average sunshine in September: 9.9h

The month with the most sunshine is August (Average sunshine: 11.9h).
The month with the least sunshine is January (Average sunshine: 4.3h).

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Average sunshine days in September
Pierce, ID

Average sunshine days in September - Pierce, ID
  • Average sunshine days in September: 21.6 days

The month with the most sunshine days is July (24.7 days).
The month with the least sunshine days is February (8.4 days).

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Average UV index in September
Pierce, ID

Average UV index in September - Pierce, ID
  • Average UV index in September: 4

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

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Average cloud cover in September
Pierce, ID

Average cloud cover in September - Pierce, ID
  • Average cloud cover in September: 21

The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in September
Pierce, ID

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

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

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