September weather forecast
Riden, MD

Share

Weather in September

The first month of the autumn, September, is still a warm month in Riden, Maryland, with an average temperature fluctuating between 77.9°F (25.5°C) and 62.8°F (17.1°C).

Temperature

September signifies a gentle decline in Riden's average high-temperature, easing from a moderately hot 84.4°F (29.1°C) in August to a still warm 77.9°F (25.5°C). Throughout September nights, Riden registers an average low-temperature of 62.8°F (17.1°C).

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Riden, during September, the rain falls for 12.6 days and regularly aggregates up to 2.13" (54mm) of precipitation. Throughout the year, there are 156.7 rainfall days, and 31.81" (808mm) of precipitation is accumulated.

Snowfall

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

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:36 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:50 pm EDT.

Sunshine

In September, the average sunshine is 9.1h.

UV index

In Riden, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 5 in September translates into these instructions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. During bright days, sunglasses that offer UVA and UVB defense are recommended.

Frequently asked questions

What is the temperature in September?

The high-temperature, in September, in Riden, is 77.9°F (25.5°C), while the low-temperature averages to 62.8°F (17.1°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is estimated at 93.2°F (34°C).

What is the average humidity in September?

In September, the average relative humidity is 74%.

How much does it rain in September?

In Riden, during September, the rain falls for 12.6 days and regularly aggregates up to 2.13" (54mm) of precipitation.

When it does not snow?

In Riden, snow does not fall in May through October.

How many hours of daylight does Riden have in September?

In Riden, 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 6:36 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:50 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 9.1h.

How high is the UV index in September?

In Riden, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to 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
Riden, MD

Average temperature in September - Riden, MD
  • Average high temperature in September: 77.9°F

The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in September: 62.8°F

The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (28°F).

Average pressure in September
Riden, MD

Average pressure in September - Riden, 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
Riden, MD

Average wind speed in September - Riden, MD
  • Average wind speed in September: 6.4mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).

Average humidity in September
Riden, MD

Average humidity in September - Riden, MD
  • Average humidity in September: 74%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is April (71%).

Average rainfall in September
Riden, MD

Average rainfall in September - Riden, MD
  • Average rainfall in September: 2.13"

The wettest month (with the highest rainfall) is August (3.62").
The driest month (with the least rainfall) is January (2.05").

Average rainfall days in September
Riden, MD

Average rainfall days in September - Riden, MD
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (8.9 days).

Average snowfall in September
Riden, MD

Average snowfall in September - Riden, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.36").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Riden, MD

Average snowfall days in September - Riden, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Riden, MD

Average daylight in September / Average sunshine in September - Riden, 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 0min).

Average sunshine days in September
Riden, MD

Average sunshine days in September - Riden, MD
  • Average sunshine days in September: 16 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (11.5 days).

Average UV index in September
Riden, MD

Average UV index in September - Riden, 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 and December (UV index 2).

Average cloud cover in September
Riden, MD

Average cloud cover in September - Riden, MD
  • Average cloud cover in September: 35

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in September
Riden, MD

Average visibility in September - Riden, 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).

Riden, Maryland, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location