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 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
September reveals a small adjustment in temperature, transitioning from an average high of 81.9°F (27.7°C) in August to a still warm 75.2°F (24°C). During the nights in September, Keysville experiences a consistent average temperature of 56.7°F (13.7°C).Humidity
In Keysville, Maryland, the average relative humidity in September is 79%.Rainfall
In Keysville, Maryland, in September, during 14.5 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. Throughout the year, there are 157.5 rainfall days, and 27.52" (699mm) of precipitation is accumulated.Snowfall
In Keysville, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:39 pm. On the last day of September, in Keysville, Maryland, sunrise is at 7:04 am and sunset at 6:52 pm EDT.
Sunshine
The average sunshine in September is 8.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. 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.
Frequently asked questions
What are September temperatures in Keysville?
What is the average humidity in September in Keysville?
How many days does it rain in September in Keysville?
When it does not snow in Keysville?
Does it snow in Keysville in September?
How many hours of daylight does Keysville have in September?
What time are sunrise and sunset in September in Keysville?
How long on average sun shines in September in Keysville?
What is the UV index reading in September in Keysville?
Average temperature in September
Keysville, MD
- Average high temperature in September: 75.2°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (36.7°F).
- Average low temperature in September: 56.7°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).
Average pressure in September
Keysville, MD
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Keysville, MD
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in September
Keysville, MD
- Average humidity in September: 79%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Keysville, MD
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is August (3.23").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days in September
Keysville, MD
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (7.6 days).
Average snowfall in September
Keysville, MD
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.03").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Keysville, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Keysville, 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 24min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Keysville, MD
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in September
Keysville, MD
- Average UV index in September: 4
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, February, November and December (UV index 2).
Average cloud cover in September
Keysville, MD
- Average cloud cover in September: 37
The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Keysville, MD
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Keysville, Maryland, USA
Weather forecast for your location
2. Allow the app to use your location
