September weather forecast
Fairfax, IN

Weather in September

The first month of the autumn, September, is still a warm month in Fairfax, Indiana, with an average temperature fluctuating between 73.9°F (23.3°C) and 55.4°F (13°C).

Temperature

In Fairfax, the average high-temperature in September marginally drops from a moderately hot 79.3°F (26.3°C) in August to a still warm 73.9°F (23.3°C). In September, the average low-temperature is 55.4°F (13°C).

Humidity

In September, the average relative humidity in Fairfax is 79%.

Rainfall

In Fairfax, in September, during 12.9 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. Throughout the year, in Fairfax, there are 151.9 rainfall days, and 23.39" (594mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Fairfax.

Daylight

In September, the average length of the day in Fairfax, Indiana, is 12h and 27min.
On the first day of the month, sunrise is at 7:07 am and sunset at 8:13 pm. On the last day of September, in Fairfax, sunrise is at 7:35 am and sunset at 7:24 pm EDT.

Sunshine

The average sunshine in September is 7.9h.

UV index

In Fairfax, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Fairfax?

The average high-temperature, in September, is 73.9°F (23.3°C), while the average low-temperature is 55.4°F (13°C). The average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, in July is calculated to be 86°F (30°C).

What is the average humidity in September in Fairfax?

In Fairfax, Indiana, the average relative humidity in September is 79%.

How much does it rain in Fairfax in September?

In Fairfax, Indiana, in September, during 12.9 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.

When it does not snow in Fairfax?

In Fairfax, Indiana, snow does not fall in June through September.

Does it snow in Fairfax in September?

In Fairfax, Indiana, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Fairfax?

In Fairfax, Indiana, the average day length in September is 12h and 27min.

When is the sunrise / sunset in September in Fairfax?

On the first day of September in Fairfax, sunrise is at 7:07 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:24 pm EDT.

How many hours of sunshine does Fairfax have in September?

In September, the average sunshine duration in Fairfax, Indiana, is 7.9h.

What is the UV index intensity in September in Fairfax?

In September, the average daily maximum UV index in Fairfax, Indiana, is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Fairfax, IN

Average temperature in September - Fairfax, IN
  • Average high temperature in September: 73.9°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (30.7°F).

  • Average low temperature in September: 55.4°F

The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).

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Average pressure in September
Fairfax, IN

Average pressure in September - Fairfax, IN
  • Average pressure in September: 30.04"Hg

The months with the highest atmospheric pressure are January and November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Fairfax, IN

Average wind speed in September - Fairfax, IN
  • Average wind speed in September: 6.9mph

The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).

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Average humidity in September
Fairfax, IN

Average humidity in September - Fairfax, IN
  • Average humidity in September: 79%

The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is October (75%).

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Average rainfall in September
Fairfax, IN

Average rainfall in September - Fairfax, IN
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is February (1.38").

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Average rainfall days in September
Fairfax, IN

Average rainfall days in September - Fairfax, IN
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (6.8 days).

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Average snowfall in September
Fairfax, IN

Average snowfall in September - Fairfax, IN
  • Average snowfall in September: 0"

The month with the highest snowfall is February (3.58").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Fairfax, IN

Average snowfall days in September - Fairfax, IN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Fairfax, IN

Average daylight in September / Average sunshine in September - Fairfax, IN
  • Average daylight in September: 12h and 27min

The month with the longest days is June (Average daylight: 15h and 5min).
The month with the shortest days is December (Average daylight: 9h and 17min).

  • Average sunshine in September: 7h and 54min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).

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Average sunshine days in September
Fairfax, IN

Average sunshine days in September - Fairfax, IN
  • Average sunshine days in September: 15 days

The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is February (10.4 days).

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Average UV index in September
Fairfax, IN

Average UV index in September - Fairfax, IN
  • Average UV index in September: 4

The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in September
Fairfax, IN

Average cloud cover in September - Fairfax, IN
  • Average cloud cover in September: 36

The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 33).

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Average visibility in September
Fairfax, IN

Average visibility in September - Fairfax, IN
  • Average visibility in September: 6mi

The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).

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