September weather forecast and climate
Sappho, WA

Weather in September

September, the first month of the autumn, in Sappho, is still a comfortable month, with average temperature varying between 63°F (17.2°C) and 49.5°F (9.7°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still enjoyable 63°F (17.2°C). The average low-temperature, in Sappho, is 49.5°F (9.7°C).

Humidity

The average relative humidity in September is 82%.

Rainfall

In Sappho, during September, the rain falls for 9.9 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Sappho, Washington, during the entire year, the rain falls for 142.6 days and collects up to 19.61" (498mm) of precipitation.

Snowfall

January through April, September and December are months with snowfall. September is the first month it typically snows in Sappho. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Sappho, during the entire year, snow falls for 5.1 days, and aggregates up to 2.17" (55mm) of snow.

Daylight

The average length of the day in Sappho is 12.5h.

Sunshine

The average sunshine in September is 8.6h.

UV index

In Sappho, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Sappho?

The average relative humidity in September in Sappho, Washington, is 82%.

How much does it rain in Sappho in September?

In Sappho, during September, the rain falls for 9.9 days and regularly aggregates up to 0.98" (25mm) of precipitation.

When does it start snowing in Sappho?

September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

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

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

How long on average sun shines in September in Sappho?

In September, the average sunshine in Sappho is 8.6h.

What is the UV index reading in September in Sappho?

The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Sappho, WA

Average temperature in September - Sappho, WA
  • Average high temperature in September: 63°F

The warmest month (with the highest average high temperature) is August (67.6°F).
The month with the lowest average high temperature is December (42.4°F).

  • Average low temperature in September: 49.5°F

The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is February (36°F).

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Average pressure in September
Sappho, WA

Average pressure in September - Sappho, WA
  • Average pressure in September: 30.01"

The month with the highest atmospheric pressure is July (30.07").
The month with the lowest atmospheric pressure is March (29.98").

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Average wind speed in September
Sappho, WA

Average wind speed in September - Sappho, WA
  • Average wind speed in September: 4.2mph

The windiest month (with the highest average wind speed) is January (7.4mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

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Average humidity in September
Sappho, WA

Average humidity in September - Sappho, WA
  • Average humidity in September: 82%

Months with the highest relative humidity are January and December (87%).
Months with the lowest relative humidity are May, July and August (80%).

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Average rainfall in September
Sappho, WA

Average rainfall in September - Sappho, WA
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is January (3.66").
The driest month (with the least rainfall) is July (0.28").

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Average rainfall days in September
Sappho, WA

Average rainfall days in September - Sappho, WA
  • Average rainfall days in September: 9.9 days

The month with the highest number of rainy days is November (16.5 days).
The month with the least rainy days is August (5.1 days).

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Average snowfall in September
Sappho, WA

Average snowfall in September - Sappho, WA
  • Average snowfall in September: 0.04"

The month with the highest snowfall is January (1.14").
Months with the least snowfall are May, June, July, August, October and November (0").

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Average snowfall days in September
Sappho, WA

Average snowfall days in September - Sappho, WA
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (1.9 days).
Months with the least snowfall days are May, June, July, August and October (0 days).

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Average daylight in September /
Average sunshine in September
Sappho, WA

Average daylight in September / Average sunshine in September - Sappho, WA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 8.6h

Months with the most sunshine are July and August (Average sunshine: 10.3h).
The month with the least sunshine is January (Average sunshine: 3.7h).

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Average sunshine days in September
Sappho, WA

Average sunshine days in September - Sappho, WA
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is July (23 days).
The month with the least sunshine days is November (11.7 days).

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Average UV index in September
Sappho, WA

Average UV index in September - Sappho, WA
  • Average UV index in September: 3

Months with the highest UV index are June, July and August (UV index 4).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Sappho, WA

Average cloud cover in September - Sappho, WA
  • Average cloud cover in September: 39

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Sappho, WA

Average visibility in September - Sappho, WA
  • Average visibility in September: 5mi

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

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