September weather forecastRocky River, OH
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Rocky River, Ohio, with an average temperature ranging between min 59.9°F (15.5°C) and max 71.6°F (22°C).Temperature
A subtle shift in Rocky River's weather is observed as August turns into September, with the average high temperature reducing from a warm 77.4°F (25.2°C) to a pleasant 71.6°F (22°C). Rocky River experiences an average low-temperature of 59.9°F (15.5°C) in month of September.Humidity
In Rocky River, the average relative humidity in September 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 September, the average ocean temperature is 71.2°F (21.8°C).Note: The majority of people find swimming in 71.2°F (21.8°C) unenjoyable. As the water temperature decreases from 69.8°F (21°C) to 59°F (15°C), breathing becomes more challenging to control.
Daylight
In Rocky River, the average length of the day in September 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 September, the average sunshine is 8.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Enhance your sun protection with tightly woven, yet airy clothing. Attention! The reflection of both water and sand can increase the intensity of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 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 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).
