September weather forecast
Rockford, WA

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Weather in September

The first month of the autumn, September, is also an agreeable month in Rockford, Washington, with temperature in the range of an average high of 72.5°F (22.5°C) and an average low of 48.2°F (9°C).

Temperature

The beginning of September marks a decrease in the average high-temperature, transitioning from a moderately hot 83.3°F (28.5°C) in August to an agreeable 72.5°F (22.5°C). A noteworthy thermal contrast characterizes Rockford's September nights, with temperatures averaging at a chilly 48.2°F (9°C).

Humidity

The average relative humidity in September in Rockford is 52%.

Rainfall

In September, the rain falls for 7.9 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. In Rockford, during the entire year, the rain falls for 125.4 days and collects up to 17.28" (439mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.35" (9mm) of snow. Throughout the year, there are 56.4 snowfall days, and 37.4" (950mm) of snow is accumulated.

Daylight

In September, the average length of the day in Rockford is 12h and 32min.
On the first day of the month, sunrise is at 6:08 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:29 pm PDT.

Sunshine

In Rockford, the average sunshine in September is 10.1h.

UV index

In Rockford, Washington, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Exercise prevention - Warding off sunburn is urged. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Updated: Jul 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

The average high-temperature and low-temperature during September are 72.5°F (22.5°C) and 48.2°F (9°C) respectively. In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is computed to be 82.4°F (28°C).

What is the average humidity in September?

In Rockford, the average relative humidity in September is 52%.

How many days does it rain in September?

In Rockford, during September, the rain falls for 7.9 days and regularly aggregates up to 0.63" (16mm) of precipitation.

When does it start to snow?

September is the first month it typically snows in Rockford. Throughout September, in the average 0.2 snowfall days, it receives 0.35" (9mm) of snow.

What is the average length of the day in September?

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

When are sunrise and sunset in September in Rockford?

In September, on the first day of the month, sunrise is at 6:08 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:29 pm PDT.

How many hours of sunshine does Rockford have in September?

In September, the average sunshine duration is 10.1h.

How high is the UV index in September?

In Rockford, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat 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
Rockford, WA

Average temperature in September - Rockford, WA
  • Average high temperature in September: 72.5°F

The warmest month (with the highest average high temperature) is August (83.3°F).
The month with the lowest average high temperature is December (32°F).

  • Average low temperature in September: 48.2°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).

Average pressure in September
Rockford, WA

Average pressure in September - Rockford, WA
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

Average wind speed in September
Rockford, WA

Average wind speed in September - Rockford, WA
  • Average wind speed in September: 4.9mph

The windiest month (with the highest average wind speed) is April (6.1mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).

Average humidity in September
Rockford, WA

Average humidity in September - Rockford, WA
  • Average humidity in September: 52%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (43%).

Average rainfall in September
Rockford, WA

Average rainfall in September - Rockford, WA
  • Average rainfall in September: 0.63"

The wettest month (with the highest rainfall) is January (2.28").
The driest months (with the least rainfall) are July and August (0.35").

Average rainfall days in September
Rockford, WA

Average rainfall days in September - Rockford, WA
  • Average rainfall days in September: 7.9 days

The month with the highest number of rainy days is March (16 days).
The month with the least rainy days is July (5.1 days).

Average snowfall in September
Rockford, WA

Average snowfall in September - Rockford, WA
  • Average snowfall in September: 0.35"

The month with the highest snowfall is January (10.51").
The months with the least snowfall are June, July and August (0").

Average snowfall days in September
Rockford, WA

Average snowfall days in September - Rockford, WA
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (13.9 days).
The months with the least snowfall days are June, July and August (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 10h and 1min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 3h and 48min).

Average sunshine days in September
Rockford, WA

Average sunshine days in September - Rockford, WA
  • Average sunshine days in September: 20.8 days

The month with the most sunshine days is July (24.3 days).
The month with the least sunshine days is March (10.3 days).

Average UV index in September
Rockford, WA

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

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September
Rockford, WA

Average cloud cover in September - Rockford, WA
  • Average cloud cover in September: 21

The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 13).

Average visibility in September
Rockford, WA

Average visibility in September - Rockford, WA
  • Average visibility in September: 6mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

Rockford, Washington, USA

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