September weather forecastWashington, IN
September
Weather in September
September, the first month of the autumn in Washington, is still a warm month, with an average temperature varying between 78.6°F (25.9°C) and 60.1°F (15.6°C).Temperature
With the onset of September, a modest change to a still warm 78.6°F (25.9°C) from August's 83.5°F (28.6°C) is noted in high-temperature. September in Washington is noted for a mean low-temperature of 60.1°F (15.6°C).Humidity
In September, the average relative humidity is 74%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.5 days and typically collects 1.61" (41mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In September, the average length of the day in Washington is 12h and 25min.On the first day of the month, sunrise is at 7:18 am and sunset at 8:18 pm. On the last day of September, in Washington, sunrise is at 7:44 am and sunset at 7:32 pm EDT.
Sunshine
In Washington, Indiana, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index in Washington, Indiana, is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, an average UV index of 5 transforms into the following instructions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Experience reduced UV exposure by about half when donning a wide-brim hat. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Washington, IN
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (37°F).
- Average low temperature in September: 60.1°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (24.4°F).
Average pressure in September
Washington, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Washington, IN
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is February (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).
Average humidity in September
Washington, IN
- Average humidity in September: 74%
The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Washington, IN
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is April (3.98").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in September
Washington, IN
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (9.4 days).
Average snowfall in September
Washington, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Washington, IN
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Washington, IN
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 30min).
Average sunshine days in September
Washington, IN
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is May (10.5 days).
Average UV index in September
Washington, IN
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Washington, IN
- Average cloud cover in September: 30
The months with the most cloud cover are January and February (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Washington, 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).
