September weather forecast and climate
Defiance, OH

The first month of the autumn, September, is also a moderately hot month in Defiance, Ohio, with average temperature ranging between max 73.8°F (23.2°C) and min 55.6°F (13.1°C).

Temperature

In Defiance, Ohio, the average high-temperature in September is essentially the same as in August - a still moderately hot 73.8°F (23.2°C). The average low-temperature, in Defiance, is 55.6°F (13.1°C).

Humidity

The average relative humidity in Defiance is 79%.

Rainfall

In Defiance, in September, it is raining for 13 days, with typically 1.81" (46mm) of accumulated precipitation. In Defiance, during the entire year, the rain falls for 160.2 days and collects up to 27.56" (700mm) of precipitation.

Snowfall

In Defiance snow does not fall in June through October.

Daylight

In Defiance, the average length of the day is 12.5h.

Sunshine

In Defiance, the average sunshine in September is 8h.

UV index

The average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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.

What is the temperature in September in Defiance?

In September, in Defiance, the average high-temperature is 73.8°F (23.2°C), and the average low-temperature is 55.6°F (13.1°C).

What is the average humidity in September in Defiance?

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

How much does it rain in Defiance in September?

In Defiance, during September, the rain falls for 13 days and regularly aggregates up to 1.81" (46mm) of precipitation.

When it does not snow in Defiance?

June through October are months without snowfall in Defiance.

How many hours of daylight does Defiance have in September?

The average length of the day in September in Defiance is 12.5h.

How long on average sun shines in September in Defiance?

The average sunshine in September is 8h.

What is the UV index reading in September in Defiance?

In September, the average daily maximum UV index in Defiance, Ohio, is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Defiance, OH
  • Average high temperature in September: 23.2°C

The warmest month (with the highest average high temperature) is July (27.2°C).
The month with the lowest average high temperature is January (-1°C).

  • Average low temperature in September: 13.1°C

The month with the highest average low temperature is July (17.6°C).
The coldest month (with the lowest average low temperature) is January (-7.2°C).

Average pressure in September - Defiance, OH
  • Average pressure in September: 1017.2mbar

The month with the highest atmospheric pressure is November (1019.6mbar).
The month with the lowest atmospheric pressure is June (1013.5mbar).

Average wind speed in September - Defiance, OH
  • Average wind speed in September: 11km/h

The windiest month (with the highest average wind speed) is January (16.6km/h).
The calmest month (with the lowest average wind speed) is August (9.8km/h).

Average humidity in September - Defiance, OH
  • Average humidity in September: 79%

Months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is October (74%).

Average rainfall in September - Defiance, OH
  • Average rainfall in September: 46mm

The wettest month (with the highest rainfall) is April (85mm).
The driest month (with the least rainfall) is December (39mm).

Average rainfall days in September - Defiance, OH
  • Average rainfall days in September: 13 days

The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is February (8.3 days).

Average snowfall in September - Defiance, OH
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (97mm).
Months with the least snowfall are June, July, August, September and October (0mm).

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

The month with the highest number of snowfall days is January (13.2 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Defiance, OH
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 8h

The month with the most sunshine is July (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 3.4h).

Average sunshine days in September - Defiance, OH
  • Average sunshine days in September: 15.4 days

The month with the most sunshine days is October (15.7 days).
The month with the least sunshine days is May (10.1 days).

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

Months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September - Defiance, OH
  • Average cloud cover in September: 36

The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in September - Defiance, OH
  • Average visibility in September: 8km

Months with the highest visibility are February, March, April, May, June, July, October, November and December (9km).
Months with the lowest visibility are January, August and September (8km).