September weather forecastCleveland, OH

The Veterans Memorial Bridge on the Cuyahoga River, in Cleveland, Ohio

September

Weather in September

The arrival of September marks the beginning of the transition from the height of summer to the cooling temperatures of autumn in Cleveland. There is a clear shift in the weather pattern as daylight hours start to reduce and temperatures show a downward trend. A significant drop in sea temperature occurs by this time, which may have some influence on the local weather conditions. Nonetheless, the city continues to enjoy relatively clear skies with less cloud cover.

Temperature

Cleveland in September undergoes a slight reduction in the average high-temperature, shifting from August's warm 77.7°F (25.4°C) to an agreeable 71.8°F (22.1°C). In September, the nighttime temperature lowers to an average of 59.2°F (15.1°C).

Humidity

The average relative humidity in September is 76%.

Rainfall

In September, the rain falls for 13.5 days. Throughout September, 1.34" (34mm) of precipitation is accumulated. Throughout the year, in Cleveland, there are 150.7 rainfall days, and 17.44" (443mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Cleveland.

Ocean temperature

In September, the average ocean temperature is 71.2°F (21.8°C).
Note: For the majority, swimming in water with a temperature of 71.2°F (21.8°C) is not enjoyable. The difficulty in managing breathing rises as the temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

The average length of the day in September in Cleveland, Ohio, is 12h and 28min.
On the first day of the month, sunrise is at 6:53 am and sunset at 7:59 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:09 pm EDT.

Sunshine

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

UV index

The average daily maximum UV index in September in Cleveland is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: A daily high UV index of 4 in September leads to these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Beware! Reflections from sand and water can intensify the Sun's UV radiation.

Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Cleveland, in September, the average high-temperature is 71.8°F (22.1°C), and the average low-temperature is 59.2°F (15.1°C).

In September, the average relative humidity is 76%.

In Cleveland, Ohio, in September, it is raining for 13.5 days, with typically 1.34" (34mm) of accumulated precipitation.

In Cleveland, Ohio, snow does not fall in May through October.

In Cleveland, in September, the average water temperature is 71.2°F (21.8°C). Swimming in 71.2°F (21.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

In Cleveland, the average day length in September is 12h and 28min.

On the first day of September, sunrise is at 6:53 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:09 pm EDT.

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

In Cleveland, Ohio, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

77.7°F

71.8°F

59.9°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.8mph

8.3mph

11mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

14.9

13.5

15.7

Average snowfall

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

13.4

12.4

12.6

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Cleveland, OH

Average high temperature in September: 71.8°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (31.3°F).

Average low temperature in September: 59.2°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in September
Cleveland, OH

Average pressure in September: 30.04"Hg

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

Average wind speed in September
Cleveland, OH

Average wind speed in September: 8mph

The windiest month (with the highest average wind speed) is January (11.3mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).

Average humidity in September
Cleveland, OH

Average humidity in September: 76%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (74%).

Average rainfall in September
Cleveland, OH

Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is October (1.81").
The driest months (with the least rainfall) are February and November (1.14").

Average rainfall days in September
Cleveland, OH

Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is October (15.7 days).
The month with the least rainy days is February (7.6 days).

Average snowfall in September
Cleveland, OH

Average snowfall in September: 0"

The month with the highest snowfall is January (3.19").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Cleveland, OH

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (16.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average sea temperature in September
Cleveland, OH

Average sea temperature in September: 71.2°F

The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (33.2°F).

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

Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

Average sunshine in September: 8h and 18min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).

Average sunshine days in September
Cleveland, OH

Average sunshine days in September: 12.4 days

The month with the most sunshine days is July (14.6 days).
The month with the least sunshine days is February (8.5 days).

Average UV index in September
Cleveland, OH

Average UV index in September: 4

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are February and December (UV index 1).

Average cloud cover in September
Cleveland, OH

Average cloud cover in September: 34

The month with the most cloud cover is January (Cloud cover 74).
The months with the least cloud cover are July and August (Cloud cover 28).

Average visibility in September
Cleveland, OH

Average visibility in September: 6mi

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