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
As Roy steps into September, the average high-temperature is measured at a still hot 87.8°F (31°C), displaying minor differences from August's 91.4°F (33°C). An average low-temperature of 67.1°F (19.5°C) is expected during September.Heat index
In September, the heat index is estimated at a sweltering 102.2°F (39°C). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.Data suggests that the heat index is set for environments in shade and with a light wind. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is found by incorporating humidity levels into the air temperature measurement. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.
Humidity
In Roy, the average relative humidity in September is 74%.Rainfall
In Roy, in September, during 14.5 rainfall days, 2.76" (70mm) of precipitation is typically accumulated. Throughout the year, in Roy, there are 165.6 rainfall days, and 36.06" (916mm) of precipitation is accumulated.Snowfall
April through November are months without snowfall.Daylight
The average length of the day in September in Roy is 12h and 21min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:18 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:40 pm CDT.
Sunshine
In Roy, the average sunshine in September is 8.8h.UV index
In Roy, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Ensure safety - Sun damage prevention is strongly urged. Around midday, solar radiation is most harmful; hence, exposure should be limited. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Frequently asked questions
Is it hot in Roy during September?
What is the average humidity in September in Roy?
How many days does it rain in September in Roy?
When it does not snow in Roy?
What is the average length of the day in September in Roy?
What time are sunrise and sunset in September in Roy?
How long on average sun shines in September in Roy?
What is the UV index intensity in September in Roy?
Average temperature in September
Roy, MS
- Average high temperature in September: 87.8°F
The warmest month (with the highest average high temperature) is July (91.9°F).
The month with the lowest average high temperature is January (55°F).
- Average low temperature in September: 67.1°F
The months with the highest average low temperature are July and August (71.8°F).
The coldest month (with the lowest average low temperature) is January (38.3°F).
Average pressure in September
Roy, MS
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Roy, MS
- Average wind speed in September: 4.9mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is July (4.6mph).
Average humidity in September
Roy, MS
- Average humidity in September: 74%
The month with the highest relative humidity is December (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Roy, MS
- Average rainfall in September: 2.76"
The wettest month (with the highest rainfall) is December (3.86").
The driest month (with the least rainfall) is November (2.09").
Average rainfall days in September
Roy, MS
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is July (21.7 days).
The month with the least rainy days is November (8 days).
Average snowfall in September
Roy, MS
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.43").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Roy, MS
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and December (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Roy, MS
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in September
Roy, MS
- Average sunshine days in September: 14.1 days
The months with the most sunshine days are October and November (20.4 days).
The month with the least sunshine days is July (7.5 days).
Average UV index in September
Roy, MS
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Roy, MS
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is October (Cloud cover 31).
Average visibility in September
Roy, MS
- Average visibility in September: 5mi
The months with the highest visibility are February, March, April, June, October and November (6mi).
The months with the lowest visibility are January, May, July, August, September and December (5mi).
Roy, Mississippi, USA
Weather forecast for your location
2. Allow the app to use your location
