September weather forecastPorter, WA
September
Weather in September
September, the first month of the autumn in Porter, is still a pleasant month, with an average temperature ranging between min 47.3°F (8.5°C) and max 69.6°F (20.9°C).Temperature
The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from a warm 76.6°F (24.8°C) to a pleasant 69.6°F (20.9°C). Porter, amid September nights, sees a noteworthy disparity from daily highs with an average temperature of 47.3°F (8.5°C).Humidity
In September, the average relative humidity in Porter is 80%.Rainfall
In Porter, Washington, during September, the rain falls for 12.3 days and regularly aggregates up to 1.89" (48mm) of precipitation. In Porter, during the entire year, the rain falls for 183.5 days and collects up to 44.17" (1122mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day in Porter, Washington, is 12h and 32min.On the first day of September, sunrise is at 6:33 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 6:54 pm PDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In Porter, Washington, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: An average maximum UV index of 4 in September leads to these recommendations:
Be vigilant - Preventing sunburn is recommended. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Porter, WA
- Average high temperature in September: 69.6°F
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in September: 47.3°F
The month with the highest average low temperature is August (50.2°F).
The coldest month (with the lowest average low temperature) is December (33.3°F).
Average pressure in September
Porter, WA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed in September
Porter, WA
- Average wind speed in September: 3.5mph
The windiest month (with the highest average wind speed) is June (4.5mph).
The calmest month (with the lowest average wind speed) is September (3.5mph).
Average humidity in September
Porter, WA
- Average humidity in September: 80%
The month with the highest relative humidity is December (91%).
The month with the lowest relative humidity is July (73%).
Average rainfall in September
Porter, WA
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is January (7.32").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in September
Porter, WA
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is March (20.8 days).
The month with the least rainy days is August (5.7 days).
Average snowfall in September
Porter, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.56").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Porter, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.5 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
Porter, WA
- Average daylight in September: 12h and 30min
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: 8h and 30min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 18min).
Average sunshine days in September
Porter, WA
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is March (7.8 days).
Average UV index in September
Porter, WA
- Average UV index in September: 4
The months with the highest UV index are June and 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
Porter, WA
- Average cloud cover in September: 45
The months with the most cloud cover are January and December (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 36).
Average visibility in September
Porter, WA
- Average visibility in September: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
