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 shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from a warm 82°F (27.8°C) to a still moderately hot 76.6°F (24.8°C). The temperature lowers to an average of 56.8°F (13.8°C) during September nights.Humidity
The average relative humidity in September is 73%.Rainfall
In Treynor, in September, during 12 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. Throughout the year, there are 125.8 rainfall days, and 25.35" (644mm) of precipitation is accumulated.Snowfall
In Treynor, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:49 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:05 pm CDT.
Sunshine
In September, the average sunshine is 9.1h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
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 Treynor in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
When is the sunrise / sunset in September in Treynor?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Treynor, IA
- Average high temperature in September: 76.6°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (16.3°F).
Average pressure in September
Treynor, IA
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Treynor, IA
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is July (7mph).
Average humidity in September
Treynor, IA
- Average humidity in September: 73%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Treynor, IA
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is May (4.09").
The driest month (with the least rainfall) is January (0.83").
Average rainfall days in September
Treynor, IA
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is February (4.2 days).
Average snowfall in September
Treynor, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.74").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Treynor, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Treynor, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
Treynor, IA
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in September
Treynor, IA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in September
Treynor, IA
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
Treynor, IA
- 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).
Treynor, Iowa, USA
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