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
As September begins, there is a minor decrease in the average high-temperature, softly falling from a warm 73.8°F (23.2°C) in August to an enjoyable 67.8°F (19.9°C). An average low-temperature of 52.5°F (11.4°C) marks the month of September in Indianola.Humidity
In Indianola, the average relative humidity in September is 76%.Rainfall
In Indianola, Washington, during September, the rain falls for 6.5 days and regularly aggregates up to 0.47" (12mm) of precipitation. In Indianola, during the entire year, the rain falls for 106.5 days and collects up to 9.09" (231mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:09 am and sunset at 6:50 pm PDT.
Sunshine
In September, the average sunshine in Indianola is 9.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Be vigilant - Preventing sunburn is recommended. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Indianola in September?
What is the average humidity in September in Indianola?
How much does it rain in Indianola in September?
When it does not snow in Indianola?
How many hours of daylight does Indianola have in September?
When are sunrise and sunset in September in Indianola?
How many hours of sunshine does Indianola have in September?
What is the UV index intensity in September in Indianola?
Average temperature in September
Indianola, WA
- Average high temperature in September: 67.8°F
The warmest month (with the highest average high temperature) is August (73.8°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in September: 52.5°F
The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (36.7°F).
Average pressure in September
Indianola, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in September
Indianola, WA
- Average wind speed in September: 4.5mph
The windiest months (with the highest average wind speed) are March and November (6.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity in September
Indianola, WA
- Average humidity in September: 76%
The months with the highest relative humidity are January and December (84%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Indianola, WA
- Average rainfall in September: 0.47"
The wettest month (with the highest rainfall) is January (1.57").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in September
Indianola, WA
- Average rainfall days in September: 6.5 days
The month with the highest number of rainy days is March (12.2 days).
The month with the least rainy days is August (3.6 days).
Average snowfall in September
Indianola, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.75").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Indianola, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Indianola, 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: 9h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 30min).
Average sunshine days in September
Indianola, WA
- Average sunshine days in September: 21 days
The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is November (15.5 days).
Average UV index in September
Indianola, WA
- Average UV index in September: 4
The months with the highest UV index are June and 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
Indianola, WA
- Average cloud cover in September: 33
The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Indianola, WA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Indianola, Washington, USA
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