September weather forecastMenno, SD
September
Weather in September
September is a time of change in Menno, bringing the first signs of autumn and a shift away from summer's swelter. There's an unmistakable autumn nip in the air, with a notable decrease in average temperatures. Rainfall reduces to average values of 1.5" (38mm), while sunlight diminishes in synchrony with the decline in temperature. The wind starts picking up speed again, as nature in Menno begins preparation for the colder months ahead. September subtly hints at the approaching winter, while basking in the last waves of summer warmth.Temperature
September ushers in a minute temperature change, with average high-temperatures reducing from August's 84.4°F (29.1°C) to a still moderately hot 76.3°F (24.6°C). Nighttime temperatures consistently average a fresh 55.2°F (12.9°C) during September.Humidity
In Menno, the average relative humidity in September is 64%.Rainfall
In Menno, in September, during 11.7 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. Throughout the year, in Menno, there are 106.8 rainfall days, and 19.29" (490mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall in Menno.Daylight
In Menno, South Dakota, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:55 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:12 pm CDT.
Sunshine
The average sunshine in September in Menno is 8.8h.UV index
The average daily maximum UV index in September in Menno is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, a daily UV index of 5 turns into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Menno, SD
- Average high temperature in September: 76.3°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 (26.2°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).
Average pressure in September
Menno, SD
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Menno, SD
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (8.5mph).
Average humidity in September
Menno, SD
- Average humidity in September: 64%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (63%).
Average rainfall in September
Menno, SD
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is February (0.51").
Average rainfall days in September
Menno, SD
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is June (15.8 days).
The month with the least rainy days is January (2.5 days).
Average snowfall in September
Menno, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.56").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Menno, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (7.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Menno, SD
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Menno, SD
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is November (22.8 days).
The month with the least sunshine days is June (11.8 days).
Average UV index in September
Menno, SD
- Average UV index in September: 5
The months with the highest UV index are 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
Menno, SD
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 23).
Average visibility in September
Menno, SD
- 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).
