Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The unfolding of September shows an average high-temperature of a refreshing 67.8°F (19.9°C), indicating a slight variance from August's 71.4°F (21.9°C). The nighttime temperature, during September, averages of 49.5°F (9.7°C).Humidity
In September, the average relative humidity is 82%.Rainfall
In Cosmopolis, in September, it is raining for 8.4 days, with typically 0.47" (12mm) of accumulated precipitation. In Cosmopolis, during the entire year, the rain falls for 113.5 days and collects up to 10.24" (260mm) of precipitation.Snowfall
In Cosmopolis, Washington, snow does not fall in April through December.Daylight
In Cosmopolis, the average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:53 pm. On the last day of September, in Cosmopolis, sunrise is at 7:13 am and sunset at 6:55 pm PDT.
Sunshine
In Cosmopolis, Washington, the average sunshine in September is 8.2h.UV index
The average daily maximum UV index in September in Cosmopolis, Washington, is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, a daily UV index of 4 turns into the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
What is the average September temperature in Cosmopolis?
What is the average humidity in September in Cosmopolis?
How many days does it rain in September in Cosmopolis?
When it does not snow in Cosmopolis?
How many hours of daylight does Cosmopolis have in September?
When is the sunrise / sunset in September in Cosmopolis?
How many hours of sunshine does Cosmopolis have in September?
What is the UV index reading in September in Cosmopolis?
Average temperature in September
Cosmopolis, WA
- Average high temperature in September: 67.8°F
The warmest month (with the highest average high temperature) is August (71.4°F).
The month with the lowest average high temperature is December (44.2°F).
- Average low temperature in September: 49.5°F
The month with the highest average low temperature is August (51.1°F).
The coldest month (with the lowest average low temperature) is December (36.5°F).
Average pressure in September
Cosmopolis, WA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is July (30.08"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed in September
Cosmopolis, WA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is January (7mph).
The calmest month (with the lowest average wind speed) is September (4.7mph).
Average humidity in September
Cosmopolis, WA
- Average humidity in September: 82%
The months with the highest relative humidity are November and December (88%).
The month with the lowest relative humidity is July (78%).
Average rainfall in September
Cosmopolis, WA
- Average rainfall in September: 0.47"
The wettest month (with the highest rainfall) is January (1.93").
The driest months (with the least rainfall) are July and August (0.12").
Average rainfall days in September
Cosmopolis, WA
- Average rainfall days in September: 8.4 days
The month with the highest number of rainy days is March (13.6 days).
The month with the least rainy days is August (3.2 days).
Average snowfall in September
Cosmopolis, WA
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (0.28").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Cosmopolis, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Cosmopolis, 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: 8h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Cosmopolis, WA
- Average sunshine days in September: 20.2 days
The month with the most sunshine days is August (25.4 days).
The months with the least sunshine days are February and March (14.1 days).
Average UV index in September
Cosmopolis, 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
Cosmopolis, WA
- Average cloud cover in September: 44
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in September
Cosmopolis, WA
- Average visibility in September: 4mi
The months with the highest visibility are February, March, April, May, June and November (5mi).
The months with the lowest visibility are January, July, August, September, October and December (4mi).
Cosmopolis, Washington, USA
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