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
September's arrival comes with a decrease in the average high-temperature, moving from a warm 85.1°F (29.5°C) in August to a still moderately hot 74.1°F (23.4°C). A significant drop from the day's peak to an average low-temperature of 51.8°F (11°C) is noted during the nights in September in Tieton.Humidity
In Tieton, the average relative humidity in September is 50%.Rainfall
In Tieton, in September, it is raining for 4.8 days, with typically 0.28" (7mm) of accumulated precipitation. In Tieton, during the entire year, the rain falls for 87.6 days and collects up to 5.94" (151mm) of precipitation.Snowfall
January through April, September, November and December are months with snowfall in Tieton, Washington. September is the first month it typically snows in Tieton. Throughout September, in the average 0.1 snowfall days, it receives 0.12" (3mm) of snow. In Tieton, during the entire year, snow falls for 19.9 days and aggregates up to 8.62" (219mm) of snow.Daylight
In September, the average length of the day is 12h and 32min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:41 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:43 pm PDT.
Sunshine
The average sunshine in September in Tieton, Washington, is 11.1h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 4 during September translates into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Frequently asked questions
What are September temperatures in Tieton?
What is the average humidity in September in Tieton?
How many days does it rain in September in Tieton?
When does it start to snow in Tieton?
How many hours of daylight does Tieton have in September?
When is the sunrise / sunset in September in Tieton?
How many hours of sunshine does Tieton have in September?
How high is the UV index in September in Tieton?
Average temperature in September
Tieton, WA
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is August (85.1°F).
The month with the lowest average high temperature is December (36°F).
- Average low temperature in September: 51.8°F
The month with the highest average low temperature is August (58.8°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).
Average pressure in September
Tieton, 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
Tieton, WA
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is June (7.4mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity in September
Tieton, WA
- Average humidity in September: 50%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (41%).
Average rainfall in September
Tieton, WA
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is December (0.87").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Tieton, WA
- Average rainfall days in September: 4.8 days
The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is July (2.3 days).
Average snowfall in September
Tieton, WA
- Average snowfall in September: 0.12"
The month with the highest snowfall is December (3.07").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in September
Tieton, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (5.7 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Tieton, 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: 11h and 1min
The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in September
Tieton, WA
- Average sunshine days in September: 23.2 days
The month with the most sunshine days is July (27.6 days).
The month with the least sunshine days is February (15.5 days).
Average UV index in September
Tieton, 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, November and December (UV index 2).
Average cloud cover in September
Tieton, WA
- Average cloud cover in September: 15
The month with the most cloud cover is January (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in September
Tieton, WA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Tieton, Washington, USA
Weather forecast for your location
2. Allow the app to use your location
