September weather forecast
Mercerville, OH

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Mercerville, Ohio, with an average temperature fluctuating between 57.7°F (14.3°C) and 79°F (26.1°C).

Temperature

During the shift to September, Mercerville records a mild decrease in average high-temperature, moving from a warm 85.3°F (29.6°C) in August to a still moderately hot 79°F (26.1°C). In the month of September, the average temperature dips to a moderate 57.7°F (14.3°C) during the night.

Humidity

The average relative humidity in September in Mercerville is 75%.

Rainfall

In Mercerville, Ohio, in September, it is raining for 10.9 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, there are 149 rainfall days, and 16.26" (413mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:58 am and sunset at 7:58 pm. On the last day of September, in Mercerville, sunrise is at 7:24 am and sunset at 7:12 pm EDT.

Sunshine

In Mercerville, Ohio, the average sunshine in September is 8.3h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
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Frequently asked questions

What is the average September temperature in Mercerville?

The average high-temperature, in September, in Mercerville, is 79°F (26.1°C), while the average low-temperature is 57.7°F (14.3°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is calculated to be 95°F (35°C).

What is the average humidity in September in Mercerville?

The average relative humidity in September in Mercerville is 75%.

How many days does it rain in September in Mercerville?

In Mercerville, Ohio, in September, during 10.9 rainfall days, 0.91" (23mm) of precipitation is typically accumulated.

When it does not snow in Mercerville?

May through September are months without snowfall in Mercerville.

Does it snow in Mercerville in September?

In Mercerville, Ohio, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Mercerville have in September?

In Mercerville, the average day length in September is 12h and 26min.

When are sunrise and sunset in September in Mercerville?

On the first day of September in Mercerville, sunrise is at 6:58 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:12 pm EDT.

How long on average sun shines in September in Mercerville?

In Mercerville, the average sunshine duration in September is 8.3h.

How high is the UV index in September in Mercerville?

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

Average temperature in September
Mercerville, OH

Average temperature in September - Mercerville, OH
  • Average high temperature in September: 79°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in September: 57.7°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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Average pressure in September
Mercerville, OH

Average pressure in September - Mercerville, OH
  • Average pressure in September: 30.05"Hg

The months with the highest atmospheric pressure are January and November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).

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Average wind speed in September
Mercerville, OH

Average wind speed in September - Mercerville, OH
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is February (7mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).

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Average humidity in September
Mercerville, OH

Average humidity in September - Mercerville, OH
  • Average humidity in September: 75%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is August (74%).

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Average rainfall in September
Mercerville, OH

Average rainfall in September - Mercerville, OH
  • Average rainfall in September: 0.91"

The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is November (0.83").

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Average rainfall days in September
Mercerville, OH

Average rainfall days in September - Mercerville, OH
  • Average rainfall days in September: 10.9 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (8.8 days).

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Average snowfall in September
Mercerville, OH

Average snowfall in September - Mercerville, OH
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.89").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Mercerville, OH

Average snowfall days in September - Mercerville, OH
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Mercerville, OH

Average daylight in September / Average sunshine in September - Mercerville, OH
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

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Average sunshine days in September
Mercerville, OH

Average sunshine days in September - Mercerville, OH
  • Average sunshine days in September: 16.4 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (10.3 days).

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Average UV index in September
Mercerville, OH

Average UV index in September - Mercerville, OH
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

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Average cloud cover in September
Mercerville, OH

Average cloud cover in September - Mercerville, OH
  • Average cloud cover in September: 35

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).

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Average visibility in September
Mercerville, OH

Average visibility in September - Mercerville, OH
  • Average visibility in September: 5mi

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

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Mercerville, Ohio, USA

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