September weather forecast
Chester, MD

Weather in September

The first month of the autumn, September, is also a moderately hot month in Chester, Maryland, with temperature in the range of an average high of 77.4°F (25.2°C) and an average low of 63.5°F (17.5°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still warm 77.4°F (25.2°C). The average low-temperature, is 63.5°F (17.5°C).

Humidity

The average relative humidity in September in Chester, Maryland, is 77%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.5 days and accumulates 1.89" (48mm) of precipitation.

Snowfall

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

Ocean temperature

In Chester, the average water temperature is 73.9°F (23.3°C).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 73.9°F (23.3°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

In Chester, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:33 am and sunset at 7:36 pm. On the last day of September, in Chester, sunrise is at 7:00 am and sunset at 6:50 pm EDT.

Sunshine

In September, the average sunshine in Chester is 9.3h.

UV index

In Chester, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in September in Chester?

In September, the average high-temperature is 77.4°F (25.2°C), and the average low-temperature is 63.5°F (17.5°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is appraised at 89.6°F (32°C).

What is the average humidity in September in Chester?

The average relative humidity in September in Chester, Maryland, is 77%.

What is the driest month in Chester?

The month with the least rainfall in Chester, Maryland, is September, when the rain falls for 12.5 days and typically collects 1.89" (48mm) of precipitation.

How much does it rain in Chester in September?

In Chester, Maryland, in September, it is raining for 12.5 days, with typically 1.89" (48mm) of accumulated precipitation.

When it does not snow in Chester?

May through October are months without snowfall.

How warm is the water in September in Chester?

In Chester, Maryland, the average seawater temperature in September is 73.9°F (23.3°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 73.9°F (23.3°C) water may be enjoyable.

How many hours of daylight does Chester have in September?

In Chester, Maryland, the average day length in September is 12h and 26min.

When is the sunrise / sunset in September in Chester?

In September, on the first day of the month, sunrise is at 6:33 am and sunset at 7:36 pm. On the last day of the month, in Chester, Maryland, sunrise is at 7:00 am and sunset at 6:50 pm EDT.

How long on average sun shines in September in Chester?

In Chester, Maryland, the average sunshine duration in September is 9.3h.

What is the UV index intensity in September in Chester?

The average daily maximum UV index in September in Chester is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Chester, MD

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

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in September: 63.5°F

The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (29.5°F).

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Average pressure in September
Chester, MD

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

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in September
Chester, MD

Average wind speed in September - Chester, MD
  • Average wind speed in September: 7.4mph

The windiest months (with the highest average wind speed) are February and March (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity in September
Chester, MD

Average humidity in September - Chester, MD
  • Average humidity in September: 77%

The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are January and November (73%).

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Average rainfall in September
Chester, MD

Average rainfall in September - Chester, MD
  • Average rainfall in September: 1.89"

The wettest month (with the highest rainfall) is July (3.31").
The driest month (with the least rainfall) is September (1.89").

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Average rainfall days in September
Chester, MD

Average rainfall days in September - Chester, MD
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is November (8.8 days).

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Average snowfall in September
Chester, MD

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

The month with the highest snowfall is January (1.42").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Chester, MD

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

The month with the highest number of snowfall days is January (4.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in September
Chester, MD

Average sea temperature in September - Chester, MD
  • Average sea temperature in September: 73.9°F

The best month for swimming (with the highest average sea temperature) is August (77.8°F).
The coldest month (with the lowest average sea temperature) is February (45.1°F).

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

Average daylight in September / Average sunshine in September - Chester, MD
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 52min).
The month with the shortest days is December (Average daylight: 9h and 29min).

  • Average sunshine in September: 9h and 18min

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).

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Average sunshine days in September
Chester, MD

Average sunshine days in September - Chester, MD
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is May (11.1 days).

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Average UV index in September
Chester, MD

Average UV index in September - Chester, 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).

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Average cloud cover in September
Chester, MD

Average cloud cover in September - Chester, MD
  • Average cloud cover in September: 34

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

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Average visibility in September
Chester, MD

Average visibility in September - Chester, 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).

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