September weather forecast
Harwood, WA

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Weather in September

September, the first month of the autumn in Harwood, is still a warm month, with an average temperature varying between 53.4°F (11.9°C) and 74.8°F (23.8°C).

Temperature

A moderate decline in the average high-temperature is seen during September, decreasing from a hot 86.5°F (30.3°C) in August to a moderately hot 74.8°F (23.8°C). An average nighttime temperature of 53.4°F (11.9°C) is observed during September.

Humidity

In September, the average relative humidity is 48%.

Rainfall

In Harwood, Washington, in September, during 3.9 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. Throughout the year, there are 82.2 rainfall days, and 5.43" (138mm) of precipitation is accumulated.

Snowfall

January through March, September, November and December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Harwood, during the entire year, snow falls for 18.5 days and aggregates up to 7.8" (198mm) of snow.

Daylight

The average length of the day in September in Harwood is 12h and 32min.
On the first day of the month, sunrise is at 6:23 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:43 pm PDT.

Sunshine

The average sunshine in September is 11.1h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: During September, 4 as the daily maximum UV index converts into the following advice:
Make use of precautions - Suggestions to resist sunburn are communicated. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. 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. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Updated: Jun 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

In September, in Harwood, the average high-temperature is 74.8°F (23.8°C), and the average low-temperature is 53.4°F (11.9°C).

What is the average humidity in September?

In Harwood, the average relative humidity in September is 48%.

How many days does it rain in September?

In Harwood, in September, it is raining for 3.9 days, with typically 0.24" (6mm) of accumulated precipitation.

When does it start snowing?

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

How many hours of daylight does Harwood have in September?

In September, the average day length is 12h and 32min.

What time are sunrise and sunset in September in Harwood?

On the first day of September, sunrise is at 6:23 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:43 pm PDT.

How long on average sun shines in September?

In September, the average sunshine duration is 11.1h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe 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
Harwood, WA

Average temperature in September - Harwood, WA
  • Average high temperature in September: 74.8°F

The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is December (36.9°F).

  • Average low temperature in September: 53.4°F

The month with the highest average low temperature is August (60.3°F).
The coldest month (with the lowest average low temperature) is December (25.5°F).

Average pressure in September
Harwood, WA

Average pressure in September - Harwood, WA
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).

Average wind speed in September
Harwood, WA

Average wind speed in September - Harwood, WA
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest month (with the lowest average wind speed) is December (4.4mph).

Average humidity in September
Harwood, WA

Average humidity in September - Harwood, WA
  • Average humidity in September: 48%

The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (39%).

Average rainfall in September
Harwood, WA

Average rainfall in September - Harwood, WA
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is January (0.87").
The driest month (with the least rainfall) is July (0.08").

Average rainfall days in September
Harwood, WA

Average rainfall days in September - Harwood, WA
  • Average rainfall days in September: 3.9 days

The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is August (2 days).

Average snowfall in September
Harwood, WA

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

The month with the highest snowfall is December (2.76").
The months with the least snowfall are April, May, June, July, August and October (0").

Average snowfall days in September
Harwood, WA

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

The month with the highest number of snowfall days is December (5.4 days).
The months with the least snowfall days are May, June, July, August and October (0 days).

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

Average daylight in September / Average sunshine in September - Harwood, 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: 11h and 1min

The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).

Average sunshine days in September
Harwood, WA

Average sunshine days in September - Harwood, WA
  • Average sunshine days in September: 23.8 days

The month with the most sunshine days is July (27.5 days).
The month with the least sunshine days is February (15.8 days).

Average UV index in September
Harwood, WA

Average UV index in September - Harwood, WA
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Harwood, WA

Average cloud cover in September - Harwood, WA
  • Average cloud cover in September: 14

The month with the most cloud cover is January (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 9).

Average visibility in September
Harwood, WA

Average visibility in September - Harwood, 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).

Harwood, Washington, USA

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