September weather forecastPortage, IN
September
Weather in September
September brings the transition from summer to fall, with temperatures beginning to drop considerably across Portage. The month offers a splash of color as the leaves change, making it a picturesque period to visit local parks. Average humidity decreases offering a more comfortable environment, while the wind speed increases adding a brisk chill to the air. After months of clear skies, the cloud cover starts to build marking the change of seasons. As the sun begins to set earlier, Portage says goodbye to its summer streak with rainfall decreasing to 1.65" (42mm).Temperature
Portage commences September with an average high-temperature of an agreeable 73°F (22.8°C), maintaining a close resemblance to the previous month. Throughout September, the nighttime temperature averages to a refreshing 58.5°F (14.7°C).Humidity
In September, the average relative humidity is 77%.Rainfall
In September, the rain falls for 14.1 days. Throughout September, 1.65" (42mm) of precipitation is accumulated. In Portage, during the entire year, the rain falls for 157.4 days and collects up to 23.9" (607mm) of precipitation.Snowfall
In Portage, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:15 am and sunset at 7:21 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:31 pm CDT.
Sunshine
In Portage, the average sunshine in September is 8.8h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: The UV index of 4 during September translates into the following guidance:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Portage, IN
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (30.2°F).
- Average low temperature in September: 58.5°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Portage, 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
Portage, IN
- Average wind speed in September: 8.1mph
The windiest month (with the highest average wind speed) is January (11.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).
Average humidity in September
Portage, IN
- Average humidity in September: 77%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Portage, IN
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days in September
Portage, IN
- Average rainfall days in September: 14.1 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (7.2 days).
Average snowfall in September
Portage, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.27").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Portage, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Portage, 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 48min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Portage, IN
- Average sunshine days in September: 12.9 days
The month with the most sunshine days is November (15.7 days).
The months with the least sunshine days are June and August (10.4 days).
Average UV index in September
Portage, IN
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Portage, IN
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Portage, IN
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
