September weather forecastWatertown, NY
September
Weather in September
September in Watertown embodies the transition from summer warmth to the crispness of autumn. The city witnesses a substantial reduction in average temperature high to 69.1°F (20.6°C), signaling the end of summer. Autumn leaves begin to adorn the city, adding vibrant hues to the landscape. While sunny hours decrease, the weather remains reasonably warm and inviting. Granted the sporadic rainfall, September is an idyllic month that blends the best of summer and fall.Temperature
In September, the meteorological conditions change slightly, with the average high-temperature moving from a warm 75.7°F (24.3°C) in August to an agreeable 69.1°F (20.6°C). Watertown temperatures generally rest at a low of 52.9°F (11.6°C) during the September nights.Humidity
The months with the lowest humidity are April and September, with an average relative humidity of 77%.Rainfall
The month with the least rainfall in Watertown is September, when the rain falls for 13 days and typically collects 1.81" (46mm) of precipitation.Snowfall
In Watertown, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 30min.On the first day of September, sunrise is at 6:27 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:45 pm EDT.
Sunshine
In Watertown, the average sunshine in September is 9.2h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 3 in September translates into this advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. 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
Watertown, NY
- Average high temperature in September: 69.1°F
The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in September: 52.9°F
The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure in September
Watertown, NY
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Watertown, NY
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).
Average humidity in September
Watertown, NY
- Average humidity in September: 77%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and September (77%).
Average rainfall in September
Watertown, NY
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is October (3.54").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days in September
Watertown, NY
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is October (17.7 days).
The month with the least rainy days is February (7 days).
Average snowfall in September
Watertown, NY
- Average snowfall in September: 0"
The month with the highest snowfall is January (10.47").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Watertown, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (19.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Watertown, NY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The months with the least sunshine are January and February (Average sunshine: 2h and 42min).
Average sunshine days in September
Watertown, NY
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is September (15.1 days).
The month with the least sunshine days is February (6.7 days).
Average UV index in September
Watertown, NY
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Watertown, NY
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Watertown, NY
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
