September weather forecast
Graham, WA

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Weather in September

September, the first month of the autumn in Graham, is still a pleasant month, with an average temperature fluctuating between 48°F (8.9°C) and 69.8°F (21°C).

Temperature

During the shift to September, Graham records a mild decrease in average high-temperature, moving from a moderately hot 77.2°F (25.1°C) in August to a pleasant 69.8°F (21°C). September nights in Graham indicate a noticeable temperature drop from the daytime highs, with an average reading lowering to a frosty 48°F (8.9°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

In Graham, during September, the rain falls for 12.1 days and regularly aggregates up to 1.77" (45mm) of precipitation. In Graham, during the entire year, the rain falls for 172.9 days and collects up to 32.28" (820mm) of precipitation.

Snowfall

In Graham, snow does not fall in May through October.

Daylight

The average length of the day in September in Graham is 12h and 32min.
On the first day of September in Graham, sunrise is at 6:29 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:49 pm PDT.

Sunshine

The average sunshine in September in Graham is 9h.

UV index

In Graham, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 3 suggests this advice:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Resources | Updated: Feb 14, 2024 | Published by: Weather U.S.

Frequently asked questions

What is the temperature in September in Graham?

The high-temperature, in September, in Graham, records 69.8°F (21°C), while the low-temperature is 48°F (8.9°C).

What is the average humidity in September in Graham?

The average relative humidity in September is 75%.

How many days does it rain in September in Graham?

In Graham, during September, the rain falls for 12.1 days and regularly aggregates up to 1.77" (45mm) of precipitation.

When it does not snow in Graham?

May through October are months without snowfall in Graham.

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

The average day length in September in Graham, Washington, is 12h and 32min.

What time are sunrise and sunset in September in Graham?

On the first day of September in Graham, sunrise is at 6:29 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:49 pm PDT.

How long on average sun shines in September in Graham?

In Graham, Washington, the average sunshine duration in September is 9h.

How high is the UV index in September in Graham?

In Graham, Washington, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability 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
Graham, WA

Average temperature in September - Graham, WA
  • Average high temperature in September: 69.8°F

The warmest month (with the highest average high temperature) is August (77.2°F).
The month with the lowest average high temperature is December (42.8°F).

  • Average low temperature in September: 48°F

The month with the highest average low temperature is August (51.3°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).

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Average pressure in September
Graham, WA

Average pressure in September - Graham, WA
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).

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Average wind speed in September
Graham, WA

Average wind speed in September - Graham, WA
  • Average wind speed in September: 3.9mph

The windiest months (with the highest average wind speed) are January and March (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).

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Average humidity in September
Graham, WA

Average humidity in September - Graham, WA
  • Average humidity in September: 75%

The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is July (70%).

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Average rainfall in September
Graham, WA

Average rainfall in September - Graham, WA
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is December (4.92").
The driest month (with the least rainfall) is July (0.43").

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Average rainfall days in September
Graham, WA

Average rainfall days in September - Graham, WA
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is March (20.2 days).
The month with the least rainy days is August (4.8 days).

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Average snowfall in September
Graham, WA

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

The month with the highest snowfall is February (2.44").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Graham, WA

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

The month with the highest number of snowfall days is February (4.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

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

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

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).

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Average sunshine days in September
Graham, WA

Average sunshine days in September - Graham, WA
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is August (23.8 days).
The month with the least sunshine days is November (9.3 days).

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Average UV index in September
Graham, WA

Average UV index in September - Graham, WA
  • 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, October, November and December (UV index 2).

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Average cloud cover in September
Graham, WA

Average cloud cover in September - Graham, WA
  • Average cloud cover in September: 37

The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in September
Graham, WA

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

The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January and February (4mi).

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Graham, Washington, USA

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