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 marks a gentle change in average high-temperature, declining from August's 82°F (27.8°C) to a still moderately hot 75.9°F (24.4°C). During September, the temperature is averaged to a low of 56.5°F (13.6°C) at night.Humidity
In Promise City, the average relative humidity in September is 77%.Rainfall
In Promise City, in September, during 11 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. In Promise City, during the entire year, the rain falls for 125.7 days and collects up to 20.39" (518mm) of precipitation.Snowfall
In Promise City, snow does not fall in June through September.Daylight
In Promise City, Iowa, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:40 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:55 pm CDT.
Sunshine
In Promise City, Iowa, the average sunshine in September is 9.3h.UV index
In Promise City, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Frequently asked questions
What are September temperatures in Promise City?
What is the average humidity in September in Promise City?
How much does it rain in Promise City in September?
When it does not snow in Promise City?
Does it snow in Promise City in September?
What is the average length of the day in September in Promise City?
When are sunrise and sunset in September in Promise City?
How many hours of sunshine does Promise City have in September?
What is the UV index intensity in September in Promise City?
Average temperature in September
Promise City, IA
- Average high temperature in September: 75.9°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 (30°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in September
Promise City, IA
- Average pressure in September: 30.02"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
Promise City, IA
- Average wind speed in September: 8mph
The windiest months (with the highest average wind speed) are January and March (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Promise City, 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 (72%).
Average rainfall in September
Promise City, IA
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is June (3.31").
The driest months (with the least rainfall) are January and December (0.71").
Average rainfall days in September
Promise City, IA
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in September
Promise City, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Promise City, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Promise City, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 0min).
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 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Promise City, IA
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.7 days).
Average UV index in September
Promise City, 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
Promise City, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July, August and September (Cloud cover 29).
Average visibility in September
Promise City, IA
- 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).
Promise City, Iowa, USA
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