September weather forecast
Riviera Beach, MD

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Weather in September

September, the first month of the autumn in Riviera Beach, is also a moderately hot month, with an average temperature varying between 77.4°F (25.2°C) and 63.3°F (17.4°C).

Temperature

September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a warm 83.7°F (28.7°C) in August to a still moderately hot 77.4°F (25.2°C). Riviera Beach's average low-temperature for the month of September records at a refreshing 63.3°F (17.4°C).

Humidity

In Riviera Beach, the average relative humidity in September is 75%.

Rainfall

September is the month with the least rainfall. Rain falls for 11.8 days and accumulates 1.89" (48mm) of precipitation.

Snowfall

In Riviera Beach, Maryland, snow does not fall in May through October.

Ocean temperature

In Riviera Beach, the average seawater temperature in September is 73.6°F (23.1°C).
Note: The allure of a swim in 73.6°F (23.1°C) waters can be influenced by your feelings towards the cold, today's sunshine, the wind's touch, and the ambient warmth. To put it in perspective, Olympic standards demand water temperatures of 77°F (25°C) to 82.4°F (28°C).

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of September, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:49 pm EDT.

Sunshine

The average sunshine in September is 9.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: A daily high UV index of 5 in September leads to these guidelines:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Stay cautious! Sand and water reflections increase UV radiation potency.
Updated: Jun 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

In Riviera Beach, 77.4°F (25.2°C) is the average high-temperature and 63.3°F (17.4°C) is the average low-temperature during September. In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 91.4°F (33°C).

What is the average humidity in September in Riviera Beach?

The average relative humidity in September is 75%.

What is the driest month in Riviera Beach?

September is the month with the least rainfall. Rain falls for 11.8 days and accumulates 1.89" (48mm) of precipitation.

How many days does it rain in September?

In Riviera Beach, in September, during 11.8 rainfall days, 1.89" (48mm) of precipitation is typically accumulated.

When it does not snow?

In Riviera Beach, snow does not fall in May through October.

What is the ocean temperature in September?

In Riviera Beach, the average seawater temperature in September is 73.6°F (23.1°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 73.6°F (23.1°C) water may be enjoyable.

What is the average length of the day in September?

The average day length in September is 12h and 26min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:49 pm EDT.

How many hours of sunshine does Riviera Beach have in September?

In Riviera Beach, the average sunshine duration in September is 9.2h.

What is the UV index intensity in September?

In Riviera Beach, Maryland, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Riviera Beach, MD

Average temperature in September - Riviera Beach, MD
  • Average high temperature in September: 77.4°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (39.6°F).

  • Average low temperature in September: 63.3°F

The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).

Average pressure in September
Riviera Beach, MD

Average pressure in September - Riviera Beach, MD
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Riviera Beach, MD

Average wind speed in September - Riviera Beach, MD
  • Average wind speed in September: 7mph

The windiest month (with the highest average wind speed) is March (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

Average humidity in September
Riviera Beach, MD

Average humidity in September - Riviera Beach, MD
  • Average humidity in September: 75%

The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, March, April and November (72%).

Average rainfall in September
Riviera Beach, MD

Average rainfall in September - Riviera Beach, MD
  • Average rainfall in September: 1.89"

The wettest month (with the highest rainfall) is August (3.54").
The driest month (with the least rainfall) is September (1.89").

Average rainfall days in September
Riviera Beach, MD

Average rainfall days in September - Riviera Beach, MD
  • Average rainfall days in September: 11.8 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is November (9.4 days).

Average snowfall in September
Riviera Beach, MD

Average snowfall in September - Riviera Beach, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Riviera Beach, MD

Average snowfall days in September - Riviera Beach, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in September
Riviera Beach, MD

Average sea temperature in September - Riviera Beach, MD
  • Average sea temperature in September: 73.5°F

The best month for swimming (with the highest average sea temperature) is August (77.5°F).
The coldest month (with the lowest average sea temperature) is February (44.5°F).

Average daylight in September /
Average sunshine in September
Riviera Beach, MD

Average daylight in September / Average sunshine in September - Riviera Beach, MD
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).

Average sunshine days in September
Riviera Beach, MD

Average sunshine days in September - Riviera Beach, MD
  • Average sunshine days in September: 16.4 days

The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (10.8 days).

Average UV index in September
Riviera Beach, MD

Average UV index in September - Riviera Beach, MD
  • Average UV index in September: 5

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

Average cloud cover in September
Riviera Beach, MD

Average cloud cover in September - Riviera Beach, MD
  • Average cloud cover in September: 34

The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in September
Riviera Beach, MD

Average visibility in September - Riviera Beach, MD
  • Average visibility in September: 6mi

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

Riviera Beach, Maryland, USA

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