September weather forecastPotsdam, NY
September
Weather in September
September signifies the transition from sultry summer to pleasant autumn in Potsdam, New York. The month sees a noticeable drop in temperatures compared to August and an increase in rainfall. The maximum temperature typically declines to a more comfortable 68.9°F (20.5°C). Additionally, cloud cover increases, mitigating the intense summer sunshine and setting the stage for the cooler fall months to follow.Temperature
September's onset introduces a mild reduction in the average high-temperature, from a moderately hot 75.4°F (24.1°C) in August to an agreeable 68.9°F (20.5°C). Potsdam records an average low-temperature of 50.9°F (10.5°C) throughout the month of September.Humidity
In Potsdam, New York, the average relative humidity in September is 79%.Rainfall
March and September are months with the least rain when the rain falls for 13.6 days and typically aggregates up to 2.01" (51mm) of rain.Snowfall
In Potsdam, snow does not fall in June through September.Daylight
In Potsdam, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:23 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:41 pm EDT.
Sunshine
The average sunshine in September is 8.7h.UV index
The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: An average UV index of 3 in September transforms into this advice:
Act with care - Obligation to protect against skin and eye damage is highlighted. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Potsdam, NY
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is January (23.4°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure in September
Potsdam, 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
Potsdam, NY
- Average wind speed in September: 6.5mph
The windiest months (with the highest average wind speed) are February and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in September
Potsdam, NY
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is April (77%).
Average rainfall in September
Potsdam, NY
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is August (3.03").
The driest months (with the least rainfall) are March and September (2.01").
Average rainfall days in September
Potsdam, NY
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is July (18.7 days).
The month with the least rainy days is February (6 days).
Average snowfall in September
Potsdam, NY
- Average snowfall in September: 0"
The month with the highest snowfall is January (8.39").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Potsdam, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (17.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Potsdam, NY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The months with the least sunshine are January and February (Average sunshine: 2h and 36min).
Average sunshine days in September
Potsdam, NY
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (15 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in September
Potsdam, NY
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Potsdam, NY
- Average cloud cover in September: 37
The months with the most cloud cover are January and February (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in September
Potsdam, NY
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, September and October (6mi).
The months with the lowest visibility are January and February (4mi).
