September weather forecastSaint John, KS
September
Weather in September
September, the first month of the autumn in Saint John, is still a warm month, with an average temperature varying between 61.7°F (16.5°C) and 81.9°F (27.7°C).Temperature
Saint John experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a tropical 90.1°F (32.3°C) in August to a warm 81.9°F (27.7°C). Saint John's nighttime temperature in September falls to an average of 61.7°F (16.5°C).Heat index
For most parts of September, the heat index is estimated at 84.2°F (29°C). If one remains active during constant exposure, it might cause exhaustion and heat cramps.Heat index specifics point out values are for conditions of shade and a slight breeze. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
Humidity
In September, the average relative humidity is 60%.Rainfall
In Saint John, in September, during 9.6 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. In Saint John, during the entire year, the rain falls for 100.8 days and collects up to 16.57" (421mm) of precipitation.Snowfall
In Saint John, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 7:05 am and sunset at 8:04 pm. On the last day of September, sunrise is at 7:30 am and sunset at 7:19 pm CDT.
Sunshine
In Saint John, the average sunshine in September is 9h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: A maximum UV index of 5 in September translates into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The solar radiation around mid-day is intense; avoid the Sun and stay safe. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint John, KS
- Average high temperature in September: 81.9°F
The warmest month (with the highest average high temperature) is July (92.7°F).
The months with the lowest average high temperature are January and December (43.3°F).
- Average low temperature in September: 61.7°F
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in September
Saint John, KS
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Saint John, KS
- Average wind speed in September: 11mph
The windiest month (with the highest average wind speed) is April (13mph).
The calmest month (with the lowest average wind speed) is August (9.7mph).
Average humidity in September
Saint John, KS
- Average humidity in September: 60%
The month with the highest relative humidity is December (65%).
The month with the lowest relative humidity is July (56%).
Average rainfall in September
Saint John, KS
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is January (0.63").
Average rainfall days in September
Saint John, KS
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is May (14.2 days).
The month with the least rainy days is January (3.7 days).
Average snowfall in September
Saint John, KS
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.87").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Saint John, KS
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (5.6 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 John, KS
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is June (Average sunshine: 11h and 30min).
The months with the least sunshine are January and December (Average sunshine: 6h and 18min).
Average sunshine days in September
Saint John, KS
- Average sunshine days in September: 17.6 days
The month with the most sunshine days is December (23.5 days).
The month with the least sunshine days is May (13.8 days).
Average UV index in September
Saint John, KS
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover in September
Saint John, KS
- Average cloud cover in September: 22
The month with the most cloud cover is April (Cloud cover 33).
The month with the least cloud cover is June (Cloud cover 18).
Average visibility in September
Saint John, KS
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
