September weather forecastDonaldson, IN
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Donaldson, Indiana, with an average temperature fluctuating between 55.2°F (12.9°C) and 73.4°F (23°C).Temperature
September's onset records a minor alteration in the average high-temperature to a still moderately hot 73.4°F (23°C) from August's 78.4°F (25.8°C). Nighttime temperature lowers to an average of 55.2°F (12.9°C) in September.Humidity
In September, the average relative humidity is 80%.Rainfall
In Donaldson, in September, during 13.1 rainfall days, 1.22" (31mm) of precipitation is typically accumulated. Throughout the year, in Donaldson, there are 150.8 rainfall days, and 19.21" (488mm) of precipitation is accumulated.Snowfall
In Donaldson, snow does not fall in June through September.Daylight
The average length of the day in September in Donaldson is 12h and 28min.On the first day of September, sunrise is at 7:12 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 7:28 pm EDT.
Sunshine
In September, the average sunshine in Donaldson, Indiana, is 8.1h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 4 during September translates into the following directions:
Ensure safety - Recommendations to avert sunburn are presented. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Donaldson, IN
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Donaldson, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Donaldson, IN
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
Donaldson, IN
- Average humidity in September: 80%
The months with the highest relative humidity are January, February and July (84%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Donaldson, IN
- Average rainfall in September: 1.22"
The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is February (0.94").
Average rainfall days in September
Donaldson, IN
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in September
Donaldson, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Donaldson, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Donaldson, IN
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 6min
The months with the most sunshine are June and July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in September
Donaldson, IN
- Average sunshine days in September: 14.8 days
The months with the most sunshine days are October and November (15.3 days).
The month with the least sunshine days is May (10.3 days).
Average UV index in September
Donaldson, IN
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Donaldson, IN
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Donaldson, IN
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
