September weather forecastSaint Mary, KY
September
Weather in September
September, the first month of the autumn in Saint Mary, is still a warm month, with an average temperature fluctuating between 59.4°F (15.2°C) and 78.6°F (25.9°C).Temperature
September is characterized by a mild reduction in the average high-temperature, from 84.7°F (29.3°C) in August to a still warm 78.6°F (25.9°C). The temperature dips to an average of 59.4°F (15.2°C) during September nights.Humidity
In Saint Mary, the average relative humidity in September is 76%.Rainfall
September is the month with the least rainfall in Saint Mary. Rain falls for 14.1 days and accumulates 2.13" (54mm) of precipitation.Snowfall
In Saint Mary, snow does not fall in May through September.Daylight
In Saint Mary, the average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 7:12 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 7:25 pm EDT.
Sunshine
In Saint Mary, the average sunshine in September is 8.2h.UV index
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 unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 5 translates into these guidelines:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint Mary, KY
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (39.9°F).
- Average low temperature in September: 59.4°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).
Average pressure in September
Saint Mary, KY
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Saint Mary, KY
- Average wind speed in September: 5.3mph
The windiest months (with the highest average wind speed) are January and February (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in September
Saint Mary, KY
- Average humidity in September: 76%
The months with the highest relative humidity are February and December (80%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Saint Mary, KY
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is September (2.13").
Average rainfall days in September
Saint Mary, KY
- Average rainfall days in September: 14.1 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (9.6 days).
Average snowfall in September
Saint Mary, KY
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Saint Mary, KY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Saint Mary, KY
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 8h and 12min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Saint Mary, KY
- Average sunshine days in September: 15 days
The month with the most sunshine days is October (18.2 days).
The month with the least sunshine days is July (11 days).
Average UV index in September
Saint Mary, KY
- 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, February, November and December (UV index 2).
Average cloud cover in September
Saint Mary, KY
- Average cloud cover in September: 33
The months with the most cloud cover are January and February (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Saint Mary, KY
- Average visibility in September: 5mi
The months with the highest visibility are March, April, June, August, October, November and December (6mi).
The months with the lowest visibility are January, February, May, July and September (5mi).
