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
The arrival of September brings an average high-temperature of a still warm 77.4°F (25.2°C), subtly diverging from August's 82.6°F (28.1°C). An average low-temperature of 63.5°F (17.5°C) is common during the nights of September.Humidity
The average relative humidity in September in Chester is 77%.Rainfall
September is the month with the least rainfall in Chester. Rain falls for 12.5 days and accumulates 1.89" (48mm) of precipitation.Snowfall
May through October are months without snowfall.Ocean temperature
In Chester, in September, the average water temperature is 73.9°F (23.3°C).Note: People sensitive to cold might find swimming in 73.9°F (23.3°C) challenging. However, conditions like sunshine, wind, and ambient temperature play a significant role in the overall comfort. Wetsuits, while optional, might be beneficial.
Daylight
The average length of the day in September in Chester is 12h and 26min.On the first day of September in Chester, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:48 pm EDT.
Sunshine
In Chester, the average sunshine in September is 9.3h.UV index
In Chester, 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 radiation for the average person.Note: In September, a daily UV index of 5 turns into the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Enhance your sun protection with tightly woven, yet airy clothing. Heed this! UV intensity is much stronger when reflected off sand and water.
Frequently asked questions
What are the temperatures in Chester in September?
What is the average humidity in September in Chester?
What is the driest month in Chester?
How much does it rain in Chester in September?
When it does not snow in Chester?
How warm is the water in September in Chester?
What is the average length of the day in September in Chester?
When is the sunrise / sunset in September in Chester?
How long on average sun shines in September in Chester?
How high is the UV index in September in Chester?
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).
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).
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).
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%).
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").
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).
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").
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).
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).
Average daylight in September /
Average sunshine in September
Chester, 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 2min
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
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).
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).
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).
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).
Chester, Maryland, USA
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