September weather forecastBrook, IN
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Brook, Indiana, with an average temperature fluctuating between 56.8°F (13.8°C) and 75°F (23.9°C).Temperature
Brook observes an average high-temperature of a still warm 75°F (23.9°C) in September, barely different from 79.5°F (26.4°C) in August. In Brook, the September nights cool down to an average low of 56.8°F (13.8°C).Humidity
In September, the average relative humidity in Brook, Indiana, is 78%.Rainfall
In Brook, in September, during 11.3 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. Throughout the year, there are 140.3 rainfall days, and 17.56" (446mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 27min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:21 pm. On the last day of September, sunrise is at 6:45 am and sunset at 6:32 pm CDT.
Sunshine
The average sunshine in September in Brook is 8.5h.UV index
In Brook, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 5 suggests these recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Brook, IN
- Average high temperature in September: 75°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Brook, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Brook, IN
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Brook, IN
- Average humidity in September: 78%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Brook, IN
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is May (2.64").
The driest months (with the least rainfall) are January and February (0.79").
Average rainfall days in September
Brook, IN
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (4.9 days).
Average snowfall in September
Brook, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Brook, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Brook, 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: 8h and 30min
The months with the most sunshine are June and July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Brook, IN
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is July (9.4 days).
Average UV index in September
Brook, IN
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Brook, IN
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July, August and September (Cloud cover 34).
Average visibility in September
Brook, IN
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
