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
In Ritzville, the beginning of September is marked by a lowered average high-temperature, shifting from August's warm 85.1°F (29.5°C) to a still moderately hot 74.3°F (23.5°C). Ritzville records a steady low-temperature average of 56.3°F (13.5°C) during September.Humidity
In September, the average relative humidity in Ritzville is 42%.Rainfall
In Ritzville, in September, during 6.6 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. Throughout the year, there are 109 rainfall days, and 10.59" (269mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 28.2 snowfall days, and 12.48" (317mm) of snow is accumulated.Daylight
In Ritzville, the average length of the day in September is 12h and 32min.On the first day of September in Ritzville, sunrise is at 6:13 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:34 pm PDT.
Sunshine
The average sunshine in September is 10.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 4 in September translates into these instructions:
Put precautions into practice - Protective measures against sun-induced damage are advised. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Ritzville, WA
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (33.8°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is August (64.6°F).
The coldest month (with the lowest average low temperature) is December (25.2°F).
Average pressure in September
Ritzville, WA
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).
Average wind speed in September
Ritzville, WA
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is March (9.8mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in September
Ritzville, WA
- Average humidity in September: 42%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (34%).
Average rainfall in September
Ritzville, WA
- Average rainfall in September: 0.39"
The wettest month (with the highest rainfall) is March (1.38").
The driest months (with the least rainfall) are July and August (0.31").
Average rainfall days in September
Ritzville, WA
- Average rainfall days in September: 6.6 days
The month with the highest number of rainy days is March (13.6 days).
The month with the least rainy days is July (4.2 days).
Average snowfall in September
Ritzville, WA
- Average snowfall in September: 0.04"
The month with the highest snowfall is February (3.54").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in September
Ritzville, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (7.8 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Ritzville, 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 36min).
- Average sunshine in September: 10h and 3min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in September
Ritzville, WA
- Average sunshine days in September: 21.9 days
The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is March (14.2 days).
Average UV index in September
Ritzville, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Ritzville, WA
- Average cloud cover in September: 18
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in September
Ritzville, 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).
Ritzville, Washington, USA
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