Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With the arrival of September, Rocky River notices a mild change in the average high-temperature, sliding from August's warm 77.4°F (25.2°C) to an agreeable 71.6°F (22°C). Rocky River experiences an average low-temperature of 59.9°F (15.5°C) in the month of September.Humidity
The average relative humidity in September in Rocky River is 76%.Rainfall
In September, the rain falls for 15.3 days. Throughout September, 2.24" (57mm) of precipitation is accumulated. In Rocky River, during the entire year, the rain falls for 172.7 days and collects up to 33.27" (845mm) of precipitation.Snowfall
In Rocky River, snow does not fall in May through October.Ocean temperature
In Rocky River, the average seawater temperature in September is 71.2°F (21.8°C).Note: Swimming is not an enjoyable activity for the majority when the water is at 71.2°F (21.8°C). The difficulty of controlling breathing increases as the temperature dips from 69.8°F (21°C) to 59°F (15°C).
Daylight
In September, the average length of the day in Rocky River is 12h and 28min.On the first day of the month, sunrise is at 6:54 am and sunset at 7:59 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:10 pm EDT.
Sunshine
In Rocky River, 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 medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Attention! The reflection of both water and sand can increase the intensity of UV rays.
Frequently asked questions
What is the usual temperature for Rocky River in September?
What is the average humidity in September in Rocky River?
How much does it rain in Rocky River in September?
When it does not snow in Rocky River?
How cold is the water in September in Rocky River?
What is the average length of the day in September in Rocky River?
What time are sunrise and sunset in September in Rocky River?
How many hours of sunshine does Rocky River have in September?
What is the UV index intensity in September in Rocky River?
Average temperature in September
Rocky River, OH
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in September: 59.9°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 (21.9°F).
Average pressure in September
Rocky River, 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
Rocky River, OH
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is January (11.6mph).
The calmest month (with the lowest average wind speed) is July (7mph).
Average humidity in September
Rocky River, OH
- Average humidity in September: 76%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is August (74%).
Average rainfall in September
Rocky River, OH
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is June (3.62").
The driest month (with the least rainfall) is February (2.17").
Average rainfall days in September
Rocky River, OH
- Average rainfall days in September: 15.3 days
The month with the highest number of rainy days is April (17.3 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in September
Rocky River, OH
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.84").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Rocky River, OH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (16.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Rocky River, 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
Rocky River, OH
- Average daylight in September: 12h and 3min
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 2min
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 42min).
Average sunshine days in September
Rocky River, OH
- Average sunshine days in September: 11.9 days
The month with the most sunshine days is October (12 days).
The month with the least sunshine days is February (7.3 days).
Average UV index in September
Rocky River, OH
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in September
Rocky River, OH
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 73).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in September
Rocky River, 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).
Rocky River, Ohio, USA
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