September weather forecast
Appleton, WA

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Weather in September

September, the first month of the autumn in Appleton, is still a pleasant month, with an average temperature ranging between min 47.7°F (8.7°C) and max 69.1°F (20.6°C).

Temperature

The onset of September results in a decrease in the average high-temperature, receding from a warm 78.6°F (25.9°C) in August to an agreeable 69.1°F (20.6°C). Throughout September nights, Appleton experiences a consistent temperature average of 47.7°F (8.7°C).

Humidity

In September, the average relative humidity is 65%.

Rainfall

In Appleton, Washington, in September, it is raining for 8.2 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, there are 152.5 rainfall days, and 26.93" (684mm) of precipitation is accumulated.

Snowfall

In Appleton, Washington, snow does not fall in May through October.

Daylight

In Appleton, the average length of the day in September is 12h and 31min.
On the first day of the month, sunrise is at 6:27 am and sunset at 7:42 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:46 pm PDT.

Sunshine

In Appleton, the average sunshine in September is 10.2h.

UV index

In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The daily high UV index of 3 in September translates into this advice:
Guard yourself - Avoiding sunburn is suggested. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Updated: Aug 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

The average high-temperature and low-temperature during September are 69.1°F (20.6°C) and 47.7°F (8.7°C) respectively.

What is the average humidity in September?

In September, the average relative humidity is 65%.

How much does it rain in September?

In Appleton, Washington, in September, during 8.2 rainfall days, 0.91" (23mm) of precipitation is typically accumulated.

When it does not snow?

May through October are months without snowfall.

What is the average length of the day in September?

In September, the average day length is 12h and 31min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:27 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:46 pm PDT.

How long on average sun shines in September?

In September, the average sunshine duration is 10.2h.

How high is the UV index in September?

In Appleton, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health 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
Appleton, WA

Average temperature in September - Appleton, WA
  • Average high temperature in September: 69.1°F

The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (35.2°F).

  • Average low temperature in September: 47.7°F

The month with the highest average low temperature is August (52.3°F).
The coldest month (with the lowest average low temperature) is December (26.1°F).

Average pressure in September
Appleton, WA

Average pressure in September - Appleton, WA
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).

Average wind speed in September
Appleton, WA

Average wind speed in September - Appleton, WA
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is June (6.4mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).

Average humidity in September
Appleton, WA

Average humidity in September - Appleton, WA
  • Average humidity in September: 65%

The months with the highest relative humidity are January, February and December (88%).
The months with the lowest relative humidity are July and August (58%).

Average rainfall in September
Appleton, WA

Average rainfall in September - Appleton, WA
  • Average rainfall in September: 0.91"

The wettest month (with the highest rainfall) is January (4.88").
The driest month (with the least rainfall) is July (0.24").

Average rainfall days in September
Appleton, WA

Average rainfall days in September - Appleton, WA
  • Average rainfall days in September: 8.2 days

The month with the highest number of rainy days is March (19.4 days).
The month with the least rainy days is August (3.8 days).

Average snowfall in September
Appleton, WA

Average snowfall in September - Appleton, WA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (6.22").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Appleton, WA

Average snowfall days in September - Appleton, WA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (6.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Appleton, WA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in September: 10h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

Average sunshine days in September
Appleton, WA

Average sunshine days in September - Appleton, WA
  • Average sunshine days in September: 20.4 days

The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is February (8.8 days).

Average UV index in September
Appleton, WA

Average UV index in September - Appleton, WA
  • 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 and February (UV index 1).

Average cloud cover in September
Appleton, WA

Average cloud cover in September - Appleton, WA
  • Average cloud cover in September: 27

The months with the most cloud cover are January and February (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 15).

Average visibility in September
Appleton, WA

Average visibility in September - Appleton, WA
  • 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 (4mi).

Appleton, Washington, USA

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