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's arrival in Fairfield comes with a mild decrease in the average high-temperature, moving subtly from 81.5°F (27.5°C) in August to a still warm 76.1°F (24.5°C). Throughout the month of September, Fairfield expects an average low of 56.3°F (13.5°C).Humidity
In Fairfield, the average relative humidity in September is 76%.Rainfall
In Fairfield, during September, the rain falls for 12.1 days and regularly aggregates up to 2.48" (63mm) of precipitation. Throughout the year, in Fairfield, there are 135.6 rainfall days, and 28.66" (728mm) of precipitation is accumulated.Snowfall
In Fairfield, snow does not fall in May through September.Daylight
In September, the average length of the day in Fairfield is 12h and 27min.On the first day of September in Fairfield, sunrise is at 6:35 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:50 pm CDT.
Sunshine
In Fairfield, the average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September in Fairfield is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The UV index of 4 during September translates into the following guidance:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Fairfield in September?
What is the average humidity in September in Fairfield?
How much does it rain in Fairfield in September?
When it does not snow in Fairfield?
Does it snow in Fairfield in September?
What is the average length of the day in September in Fairfield?
What time are sunrise and sunset in September in Fairfield?
How long on average sun shines in September in Fairfield?
What is the UV index reading in September in Fairfield?
Average temperature in September
Fairfield, IA
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (29.1°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in September
Fairfield, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Fairfield, IA
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Fairfield, IA
- Average humidity in September: 76%
The months with the highest relative humidity are June and July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Fairfield, IA
- Average rainfall in September: 2.48"
The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are January and December (1.18").
Average rainfall days in September
Fairfield, IA
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in September
Fairfield, IA
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (4.33").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Fairfield, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Fairfield, 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 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Fairfield, IA
- Average sunshine days in September: 16.5 days
The months with the most sunshine days are October and November (18.8 days).
The month with the least sunshine days is May (11 days).
Average UV index in September
Fairfield, 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
Fairfield, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in September
Fairfield, IA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Fairfield, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location