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
Transitioning from August to September involves a subtle drop in average high-temperatures, descending from 85.6°F (29.8°C) to a still warm 78.4°F (25.8°C). Throughout September, Rosemary Hills's nights cool down to an average of 61.7°F (16.5°C).Humidity
In Rosemary Hills, Maryland, the average relative humidity in September is 73%.Rainfall
In Rosemary Hills, in September, during 12.4 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. In Rosemary Hills, during the entire year, the rain falls for 154.8 days and collects up to 30.28" (769mm) of precipitation.Snowfall
In Rosemary Hills, snow does not fall in May through October.Daylight
In Rosemary Hills, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:38 pm. On the last day of September, in Rosemary Hills, sunrise is at 7:03 am and sunset at 6:51 pm EDT.
Sunshine
In September, the average sunshine in Rosemary Hills is 8.7h.UV index
In September, the average daily maximum UV index in Rosemary Hills is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The daily maximum UV index of 5 in September interprets into the following advice:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Frequently asked questions
What are the temperatures in Rosemary Hills in September?
What is the average humidity in September in Rosemary Hills?
How many days does it rain in September in Rosemary Hills?
When it does not snow in Rosemary Hills?
How many hours of daylight does Rosemary Hills have in September?
When is the sunrise / sunset in September in Rosemary Hills?
How long on average sun shines in September in Rosemary Hills?
What is the UV index intensity in September in Rosemary Hills?
Average temperature in September
Rosemary Hills, MD
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.7°F).
- Average low temperature in September: 61.7°F
The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).
Average pressure in September
Rosemary Hills, 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 (29.95"Hg).
Average wind speed in September
Rosemary Hills, MD
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Rosemary Hills, MD
- Average humidity in September: 73%
The months with the highest relative humidity are May, October and December (75%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
Rosemary Hills, MD
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (1.89").
Average rainfall days in September
Rosemary Hills, MD
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is November (8.5 days).
Average snowfall in September
Rosemary Hills, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Rosemary Hills, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.6 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
Rosemary Hills, 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: 8h and 4min
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 54min).
Average sunshine days in September
Rosemary Hills, MD
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (12 days).
Average UV index in September
Rosemary Hills, 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
Rosemary Hills, MD
- Average cloud cover in September: 38
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Rosemary Hills, MD
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Rosemary Hills, Maryland, USA
Weather forecast for your location
2. Allow the app to use your location
