September weather forecastNew Haven, IN
September
Weather in September
With autumn's arrival, September in New Haven, Indiana sees the weather starting to simmer down. Moderating temperatures descend to 55.4°F (13°C) while only reaching up to 73.9°F (23.3°C). The month moves away from the drenching rains of summer reducing the average precipitation. The transformation of the green cityscape into a canvas of rusty browns and golds is a sight to behold. September's charm lies within these transitional moments, holding onto the last vestiges of summer warmth while beckoning the fall.Temperature
September brings a slight decrease in temperature, down from a warm 79.3°F (26.3°C) in August to a still moderately hot 73.9°F (23.3°C). In New Haven, the average temperature during the nights of September drops to a moderate 55.4°F (13°C).Humidity
In September, the average relative humidity is 79%.Rainfall
In New Haven, in September, it is raining for 12.9 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, in New Haven, there are 151.9 rainfall days, and 23.39" (594mm) of precipitation is accumulated.Snowfall
In New Haven, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 7:07 am and sunset at 8:12 pm. On the last day of September, sunrise is at 7:36 am and sunset at 7:23 pm EDT.
Sunshine
The average sunshine in September in New Haven is 7.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. The solar radiation around mid-day is intense; avoid the Sun and stay safe. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
New Haven, IN
- Average high temperature in September: 73.9°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in September: 55.4°F
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).
Average pressure in September
New Haven, IN
- Average pressure in September: 30.04"Hg
The months with the highest atmospheric pressure are January and November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
New Haven, IN
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in September
New Haven, IN
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
New Haven, IN
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is February (1.38").
Average rainfall days in September
New Haven, IN
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in September
New Haven, IN
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.58").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
New Haven, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
New Haven, 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 18min).
- Average sunshine in September: 7h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in September
New Haven, IN
- Average sunshine days in September: 15 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is February (10.4 days).
Average UV index in September
New Haven, IN
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
New Haven, IN
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in September
New Haven, IN
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).
