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 August transitions into September, Thayer sees a gentle drop in the average high-temperature, transitioning from 81.7°F (27.6°C) to a still warm 75.4°F (24.1°C). Throughout September, an average low-temperature of 56.1°F (13.4°C) is experienced in Thayer, Iowa.Humidity
In Thayer, the average relative humidity in September is 77%.Rainfall
In Thayer, in September, during 10.7 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Thayer, during the entire year, the rain falls for 122.6 days and collects up to 20.43" (519mm) of precipitation.Snowfall
June through September are months without snowfall in Thayer.Daylight
The average length of the day in September is 12h and 27min.On the first day of September, sunrise is at 6:43 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:59 pm CDT.
Sunshine
In September, the average sunshine in Thayer is 9.3h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 4 during September leads to these instructions:
Undertake protective steps - Recommendations to avoid sunburn are issued. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Frequently asked questions
What are the temperatures in Thayer in September?
What is the average humidity in September in Thayer?
How much does it rain in Thayer in September?
When it does not snow in Thayer?
Does it snow in Thayer in September?
What is the average length of the day in September in Thayer?
What time are sunrise and sunset in September in Thayer?
How long on average sun shines in September in Thayer?
How high is the UV index in September in Thayer?
Average temperature in September
Thayer, IA
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (29.1°F).
- Average low temperature in September: 56.1°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).
Average pressure in September
Thayer, IA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Thayer, IA
- Average wind speed in September: 8.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in September
Thayer, IA
- Average humidity in September: 77%
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Thayer, IA
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is June (3.74").
The driest month (with the least rainfall) is December (0.63").
Average rainfall days in September
Thayer, IA
- Average rainfall days in September: 10.7 days
The months with the highest number of rainy days are May and June (16.4 days).
The months with the least rainy days are January and February (3.7 days).
Average snowfall in September
Thayer, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.66").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Thayer, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Thayer, 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 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Thayer, IA
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is December (21 days).
The months with the least sunshine days are May and June (11.3 days).
Average UV index in September
Thayer, IA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Thayer, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in September
Thayer, IA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Thayer, Iowa, USA
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