September weather forecast and climate
Riverside, OH

The first month of the autumn, September, is also a moderately hot month in Riverside, Ohio, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 74.8°F (23.8°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still moderately hot 74.8°F (23.8°C). In Riverside, the average low-temperature is 56.8°F (13.8°C).

Humidity

The average relative humidity is 77%.

Rainfall

In Riverside, it is raining for 12.1 days, with typically 1.34" (34mm) of accumulated precipitation. Throughout the year, there are 146.7 rainfall days, and 21.81" (554mm) of precipitation is accumulated.

Snowfall

In Riverside snow does not fall in May through September.

Daylight

In September, the average length of the day in Riverside is 12.4h.

Sunshine

In September, the average sunshine is 8.2h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Riverside?

The average high-temperature, in September, in Riverside, Ohio, is 74.8°F (23.8°C), while the average low-temperature is 56.8°F (13.8°C).

What is the average humidity in September in Riverside?

In Riverside, Ohio, the average relative humidity in September is 77%.

How many days does it rain in September in Riverside?

In Riverside, Ohio, in September, it is raining for 12.1 days, with typically 1.34" (34mm) of accumulated precipitation.

Does it snow in Riverside in September?

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

When it does not snow in Riverside?

In Riverside snow does not fall in May through September.

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

In Riverside, the average length of the day in September is 12.4h.

How long on average sun shines in September in Riverside?

In Riverside, the average sunshine in September is 8.2h.

What is the UV index intensity in September in Riverside?

The average daily maximum UV index in September in Riverside is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.
Average temperature in September - Riverside, OH
  • Average high temperature in September: 74.8°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 (32.5°F).

  • Average low temperature in September: 56.8°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 (21.4°F).

Average pressure in September - Riverside, OH
  • Average pressure in September: 30.04"

The month with the highest atmospheric pressure is November (30.14").
The month with the lowest atmospheric pressure is June (29.93").

Average wind speed in September - Riverside, OH
  • Average wind speed in September: 6.4mph

The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in September - Riverside, OH
  • Average humidity in September: 77%

The month with the highest relative humidity is January (83%).
Months with the lowest relative humidity are October and November (75%).

Average rainfall in September - Riverside, OH
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is January (1.3").

Average rainfall days in September - Riverside, OH
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (7.3 days).

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

The month with the highest snowfall is March (1.85").
Months with the least snowfall are May, June, July, August and September (0").

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

The month with the highest number of snowfall days is January (8.5 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Riverside, OH
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 8.2h

The month with the most sunshine is June (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 3.6h).

Average sunshine days in September - Riverside, OH
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (9.5 days).

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

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

Average cloud cover in September - Riverside, OH
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in September - Riverside, OH
  • Average visibility in September: 6mi

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