September weather forecastFairfield, OH
September
Weather in September
The September weather in Fairfield, Ohio, brings the start of fall, with diminishing heat and slowly shortening days. The most notable shifts appear in the declining temperatures and gradually increasig cloud cover. Although rainfall drops further, it is still relatively frequent, nourishing the transforming foliage. Humidity reduces slightly, making the weather more pleasant. By the end of September, Fairfield witnesses an apparent tapering off of summer's tenacity.Temperature
Fairfield's weather subtly changes with the onset of September, barely falling from 82.6°F (28.1°C) in August to a still moderately hot 77°F (25°C). During September nights, Fairfield records an average temperature of 58.1°F (14.5°C).Humidity
In September, the average relative humidity is 75%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.2 days and typically collects 1.42" (36mm) of precipitation.Snowfall
In Fairfield, snow does not fall in May through October.Daylight
In September, the average length of the day in Fairfield is 12h and 26min.On the first day of September in Fairfield, sunrise is at 7:07 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 7:21 pm EDT.
Sunshine
The average sunshine in September in Fairfield is 8.3h.UV index
In September, the average daily maximum UV index in Fairfield is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The daily high UV index of 4 in September translates into this advice:
Make use of precautions - Shielding skin and eyes from injury is a requirement. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Fairfield, OH
- Average high temperature in September: 77°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 (35.2°F).
- Average low temperature in September: 58.1°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 (22.8°F).
Average pressure in September
Fairfield, OH
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January and November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Fairfield, OH
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in September
Fairfield, OH
- Average humidity in September: 75%
The months with the highest relative humidity are January, February and December (81%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Fairfield, OH
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is September (1.42").
Average rainfall days in September
Fairfield, OH
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is January (7.9 days).
Average snowfall in September
Fairfield, OH
- Average snowfall in September: 0"
The months with the highest snowfall are February and March (1.81").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Fairfield, OH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.1 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
Fairfield, OH
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 18min
The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Fairfield, OH
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in September
Fairfield, OH
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Fairfield, OH
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Fairfield, OH
- 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).
