September weather forecast
Martha Lake, WA

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Weather in September

The first month of the autumn, September, is still a refreshing month in Martha Lake, Washington, with an average temperature ranging between max 67.1°F (19.5°C) and min 51.4°F (10.8°C).

Temperature

A mild drop in Martha Lake's average high-temperature is observed in September, transitioning from a pleasant 72.7°F (22.6°C) in August to a refreshing 67.1°F (19.5°C). Martha Lake's September nights cool down to an average low-temperature of 51.4°F (10.8°C).

Humidity

In Martha Lake, the average relative humidity in September is 77%.

Rainfall

In Martha Lake, Washington, during September, the rain falls for 11.3 days and regularly aggregates up to 1.5" (38mm) of precipitation. In Martha Lake, during the entire year, the rain falls for 173.1 days and collects up to 26.02" (661mm) of precipitation.

Snowfall

In Martha Lake, snow does not fall in May through October.

Daylight

The average length of the day in September is 12h and 33min.
On the first day of September, sunrise is at 6:28 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

In September, the average sunshine is 9.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 4 suggests these recommendations:
Take precautions - Protection against sunburn is recommended. To protect against the Sun's most potent rays, avoid direct exposure around midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Updated: Aug 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September in Martha Lake?

The high-temperature, in September, in Martha Lake, is 67.1°F (19.5°C), while the low-temperature averages to 51.4°F (10.8°C).

What is the average humidity in September?

In Martha Lake, the average relative humidity in September is 77%.

How many days does it rain in September?

In Martha Lake, in September, during 11.3 rainfall days, 1.5" (38mm) of precipitation is typically accumulated.

When it does not snow?

May through October are months without snowfall.

How many hours of daylight does Martha Lake have in September?

In Martha Lake, Washington, the average day length in September is 12h and 33min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:28 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 many hours of sunshine does Martha Lake have in September?

In Martha Lake, the average sunshine duration in September is 9.4h.

How high is the UV index in September?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to Sun's UV rays.
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
Martha Lake, WA

Average temperature in September - Martha Lake, WA
  • Average high temperature in September: 67.1°F

The warmest month (with the highest average high temperature) is August (72.7°F).
The month with the lowest average high temperature is December (42.6°F).

  • Average low temperature in September: 51.4°F

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.4°F).

Average pressure in September
Martha Lake, WA

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

The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).

Average wind speed in September
Martha Lake, WA

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

The windiest month (with the highest average wind speed) is November (6.2mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).

Average humidity in September
Martha Lake, WA

Average humidity in September - Martha Lake, WA
  • Average humidity in September: 77%

The months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is July (72%).

Average rainfall in September
Martha Lake, WA

Average rainfall in September - Martha Lake, WA
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is December (3.54").
The driest month (with the least rainfall) is July (0.43").

Average rainfall days in September
Martha Lake, WA

Average rainfall days in September - Martha Lake, WA
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.3 days).

Average snowfall in September
Martha Lake, WA

Average snowfall in September - Martha Lake, WA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (4.61").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Martha Lake, WA

Average snowfall days in September - Martha Lake, WA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (5.2 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
Martha Lake, WA

Average daylight in September / Average sunshine in September - Martha Lake, WA
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in September
Martha Lake, WA

Average sunshine days in September - Martha Lake, WA
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is August (22.6 days).
The month with the least sunshine days is November (9.1 days).

Average UV index in September
Martha Lake, WA

Average UV index in September - Martha Lake, WA
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Martha Lake, WA

Average cloud cover in September - Martha Lake, WA
  • Average cloud cover in September: 32

The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 25).

Average visibility in September
Martha Lake, WA

Average visibility in September - Martha Lake, WA
  • Average visibility in September: 6mi

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

Martha Lake, Washington, USA

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