Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Indianapolis's transition from August to September introduces an average high-temperature of a still moderately hot 75.9°F (24.4°C), marking an insignificant variation from the 81.1°F (27.3°C). An average nighttime temperature of 58.3°F (14.6°C) is observed in Indianapolis, Indiana, during September.Humidity
In Indianapolis, Indiana, the average relative humidity in September is 76%.Rainfall
In Indianapolis, in September, it is raining for 12.2 days, with typically 1.46" (37mm) of accumulated precipitation. In Indianapolis, during the entire year, the rain falls for 146.4 days and collects up to 21.14" (537mm) of precipitation.Snowfall
In Indianapolis, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 7:13 am and sunset at 8:15 pm. On the last day of September, sunrise is at 7:40 am and sunset at 7:28 pm EDT.
Sunshine
In September, the average sunshine is 8.4h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Undertake precautions - Guarding against sun damage is counselled. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Stay sun-safe with clothing that is both closely woven and worn loosely.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Indianapolis have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Indianapolis, IN
- Average high temperature in September: 75.9°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in September: 58.3°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in September
Indianapolis, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Indianapolis, IN
- Average wind speed in September: 6.5mph
The windiest months (with the highest average wind speed) are January and February (9.8mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in September
Indianapolis, IN
- Average humidity in September: 76%
The month with the highest relative humidity is December (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Indianapolis, IN
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is May (2.68").
The driest month (with the least rainfall) is February (1.22").
Average rainfall days in September
Indianapolis, IN
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in September
Indianapolis, IN
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.28").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Indianapolis, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Indianapolis, IN
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Indianapolis, IN
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is May (11.1 days).
Average UV index in September
Indianapolis, IN
- Average UV index in September: 4
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, October, November and December (UV index 2).
Average cloud cover in September
Indianapolis, IN
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Indianapolis, IN
- 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).
Indianapolis, Indiana, USA
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