September weather forecastDennis, MS
September
Weather in September
The first month of the autumn, September, is still a warm month in Dennis, Mississippi, with temperature in the range of an average high of 84°F (28.9°C) and an average low of 64°F (17.8°C).Temperature
The transition into September shows a subtle variation to a warm 84°F (28.9°C) from August's 89.1°F (31.7°C) in the average high-temperature. Throughout September nights, Dennis registers an average low-temperature of 64°F (17.8°C).Heat index
The heat index in September is estimated at a hot 91.4°F (33°C). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.Given the heat index, its values are aligned with shaded sites and gentle winds. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a metric representing the sensation of warmth when air temperature and moisture come together. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
Humidity
In Dennis, Mississippi, the average relative humidity in September is 73%.Rainfall
In Dennis, in September, during 13.5 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. In Dennis, Mississippi, during the entire year, the rain falls for 169.1 days and collects up to 38.11" (968mm) of precipitation.Snowfall
April through October are months without snowfall in Dennis.Daylight
In September, the average length of the day is 12h and 23min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:18 pm. On the last day of September, in Dennis, sunrise is at 6:47 am and sunset at 6:37 pm CDT.
Sunshine
In Dennis, Mississippi, the average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum UV index of 5 during September translates into these guidelines:
Take precautions - Protection against skin and eye damage is obliged. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dennis, MS
- Average high temperature in September: 84°F
The warmest month (with the highest average high temperature) is July (90°F).
The month with the lowest average high temperature is January (48°F).
- Average low temperature in September: 64°F
The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (33.3°F).
Average pressure in September
Dennis, MS
- Average pressure in September: 30.01"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
Dennis, MS
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is February (7.8mph).
The calmest month (with the lowest average wind speed) is July (4.6mph).
Average humidity in September
Dennis, MS
- Average humidity in September: 73%
The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Dennis, MS
- Average rainfall in September: 2.6"
The wettest month (with the highest rainfall) is February (4.13").
The driest month (with the least rainfall) is November (2.28").
Average rainfall days in September
Dennis, MS
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (18.8 days).
The month with the least rainy days is November (9.5 days).
Average snowfall in September
Dennis, MS
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Dennis, MS
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.3 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
Dennis, MS
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 9h and 6min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The months with the least sunshine are February and December (Average sunshine: 4h and 36min).
Average sunshine days in September
Dennis, MS
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is October (19.1 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in September
Dennis, MS
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Dennis, MS
- Average cloud cover in September: 30
The months with the most cloud cover are February and December (Cloud cover 50).
The months with the least cloud cover are June and September (Cloud cover 30).
Average visibility in September
Dennis, MS
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, May and July (5mi).
