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 arrival of September in Winthrop indicates a decrease in the average high-temperature, moving from a moderately hot 75.9°F (24.4°C) in August to a comfortable 64.6°F (18.1°C). Despite soaring daytime temperatures, Winthrop registers a consistent average low-temperature of 41.2°F (5.1°C) in September.Humidity
In September, the average relative humidity in Winthrop is 62%.Rainfall
In Winthrop, in September, during 9.7 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, in Winthrop, there are 142.6 rainfall days, and 17.91" (455mm) of precipitation is accumulated.Snowfall
Months with snowfall in Winthrop are January through April, September through December. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.2" (5mm) of snow. Throughout the year, in Winthrop, there are 66.9 snowfall days, and 43.98" (1117mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 34min.On the first day of September in Winthrop, Washington, sunrise is at 6:19 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:40 pm PDT.
Sunshine
The average sunshine in September in Winthrop is 10.6h.UV index
In Winthrop, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: In September, the maximum UV index of 3 suggests this advice:
Take precautions - Protection against sun damage is advised. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Frequently asked questions
What are the temperatures in Winthrop in September?
What is the average humidity in September in Winthrop?
How much does it rain in Winthrop in September?
When does it start snowing in Winthrop?
How many hours of daylight does Winthrop have in September?
What time are sunrise and sunset in September in Winthrop?
How long on average sun shines in September in Winthrop?
How high is the UV index in September in Winthrop?
Average temperature in September
Winthrop, WA
- Average high temperature in September: 64.6°F
The warmest month (with the highest average high temperature) is August (75.9°F).
The month with the lowest average high temperature is December (27.5°F).
- Average low temperature in September: 41.2°F
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (13.5°F).
Average pressure in September
Winthrop, WA
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are June and August (29.95"Hg).
Average wind speed in September
Winthrop, WA
- Average wind speed in September: 4.6mph
The windiest months (with the highest average wind speed) are June and July (5mph).
The calmest months (with the lowest average wind speed) are January and December (3.6mph).
Average humidity in September
Winthrop, WA
- Average humidity in September: 62%
The month with the highest relative humidity is January (93%).
The months with the lowest relative humidity are July and August (53%).
Average rainfall in September
Winthrop, WA
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is December (2.48").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in September
Winthrop, WA
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (6.1 days).
Average snowfall in September
Winthrop, WA
- Average snowfall in September: 0.2"
The month with the highest snowfall is December (12.87").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in September
Winthrop, WA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (15.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Winthrop, WA
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Winthrop, WA
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is August (23 days).
The month with the least sunshine days is March (8.3 days).
Average UV index in September
Winthrop, WA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover in September
Winthrop, WA
- Average cloud cover in September: 23
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Winthrop, WA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (3mi).
Winthrop, Washington, USA
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