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
Observing a mild shift, the average high-temperature during September reduces from August's moderately hot 81.9°F (27.7°C) to a pleasant 70.5°F (21.4°C). An average low-temperature of 49.1°F (9.5°C) is recorded during the nights in September.Humidity
In Waterville, the average relative humidity in September is 52%.Rainfall
In Waterville, Washington, in September, it is raining for 6.7 days, with typically 0.55" (14mm) of accumulated precipitation. Throughout the year, in Waterville, there are 99.9 rainfall days, and 10.47" (266mm) of precipitation is accumulated.Snowfall
January through April, September through December are months with snowfall in Waterville, Washington. September is the first month it typically snows in Waterville. Throughout September, in the average 0.3 snowfall days, it receives 0.71" (18mm) of snow. Throughout the year, in Waterville, Washington, there are 48.7 snowfall days, and 28.62" (727mm) of snow is accumulated.Daylight
In September, the average length of the day in Waterville is 12h and 33min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:40 pm. On the last day of September, sunrise is at 6:59 am and sunset at 6:40 pm PDT.
Sunshine
The average sunshine in September is 10.7h.UV index
In Waterville, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 suggests these recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Frequently asked questions
What are September temperatures in Waterville?
What is the average humidity in September in Waterville?
How many days does it rain in September in Waterville?
When does it start snowing in Waterville?
How many hours of daylight does Waterville have in September?
When are sunrise and sunset in September in Waterville?
How long on average sun shines in September in Waterville?
What is the UV index reading in September in Waterville?
Average temperature in September
Waterville, WA
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is December (30.2°F).
- Average low temperature in September: 49.1°F
The month with the highest average low temperature is August (55.8°F).
The coldest months (with the lowest average low temperature) are January and December (19°F).
Average pressure in September
Waterville, 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
Waterville, WA
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is June (6.1mph).
The calmest months (with the lowest average wind speed) are January and December (3.5mph).
Average humidity in September
Waterville, WA
- Average humidity in September: 52%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are July and August (43%).
Average rainfall in September
Waterville, WA
- Average rainfall in September: 0.55"
The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Waterville, WA
- Average rainfall days in September: 6.7 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (3.8 days).
Average snowfall in September
Waterville, WA
- Average snowfall in September: 0.71"
The month with the highest snowfall is December (9.06").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in September
Waterville, WA
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is January (12 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Waterville, 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 4min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Waterville, WA
- Average sunshine days in September: 21.7 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is March (13.2 days).
Average UV index in September
Waterville, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Waterville, WA
- Average cloud cover in September: 19
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Waterville, 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).
Waterville, Washington, USA
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