September weather forecastChesterton, IN
September
Weather in September
September in Chesterton puts forth a notable change in weather patterns, acting as a bridge between summer and fall. The temperature begins to cool down, marking the commencement of the autumn equinox. The weather presents comfortable temperatures, making it an ideal month for outdoor activities. Rainfall decreases to an average of 2.13" (54mm), and daylight hours begin to recede. With everything taken into account, September's weather provides a pleasant environment with the steadfast transition towards the cooler autumn months.Temperature
The transition into September in Chesterton is accompanied by a slight temperature decrease, with the average high-temperature shifting from a moderately hot 77.4°F (25.2°C) in August to an agreeable 71.8°F (22.1°C). An average temperature of 58.6°F (14.8°C) marks the nights in September.Humidity
The average relative humidity in September in Chesterton is 78%.Rainfall
In September, in Chesterton, the rain falls for 14 days. Throughout September, 2.13" (54mm) of precipitation is accumulated. In Chesterton, during the entire year, the rain falls for 155.2 days and collects up to 25.24" (641mm) of precipitation.Snowfall
In Chesterton, snow does not fall in May through October.Ocean temperature
In Chesterton, Indiana, in September, the average water temperature is 66.2°F (19°C).Note: For most individuals, swimming in 66.2°F (19°C) is not a pleasant experience. The difficulty in managing breathing increases as the temperature decreases from 69.8°F (21°C) to 59°F (15°C).
Daylight
In September, the average length of the day in Chesterton is 12h and 28min.On the first day of September in Chesterton, sunrise is at 6:15 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:31 pm CDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
In Chesterton, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chesterton, IN
- Average high temperature in September: 71.8°F
The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (30.2°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure in September
Chesterton, 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
Chesterton, IN
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is January (12mph).
The calmest months (with the lowest average wind speed) are July and August (7.3mph).
Average humidity in September
Chesterton, IN
- Average humidity in September: 78%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Chesterton, IN
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is June (3.54").
The driest months (with the least rainfall) are January and December (1.14").
Average rainfall days in September
Chesterton, IN
- Average rainfall days in September: 14 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.1 days).
Average snowfall in September
Chesterton, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.11").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Chesterton, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in September
Chesterton, IN
- Average sea temperature in September: 66°F
The best month for swimming (with the highest average sea temperature) is August (70°F).
The coldest months (with the lowest average sea temperature) are February, March and April (37°F).
Average daylight in September /
Average sunshine in September
Chesterton, 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 54min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in September
Chesterton, IN
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is November (15.4 days).
The month with the least sunshine days is July (10.7 days).
Average UV index in September
Chesterton, IN
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Chesterton, IN
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Chesterton, 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).
