September weather forecastPortland, NY
September
Weather in September
September, the first month of the autumn in Portland, is also an agreeable month, with an average temperature fluctuating between 68.9°F (20.5°C) and 58.5°F (14.7°C).Temperature
September's onset brings an average high-temperature of a pleasant 68.9°F (20.5°C), showing a minute difference from August's 73.9°F (23.3°C). During September, Portland observes a consistent average nighttime temperature of 58.5°F (14.7°C).Humidity
With an average relative humidity of 77%, September is the least humid month.Rainfall
The month with the least rainfall in Portland is September, when the rain falls for 16.2 days and typically collects 2.24" (57mm) of precipitation.Snowfall
In Portland, New York, snow does not fall in June through September.Daylight
The average length of the day in September in Portland is 12h and 28min.On the first day of September in Portland, sunrise is at 6:43 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:00 pm EDT.
Sunshine
In Portland, the average sunshine in September is 8.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 4 during September translates into the following guidance:
Ensure safety - Imperative it is to shield skin and eyes from damage. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Portland, NY
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (74.1°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in September: 58.5°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in September
Portland, NY
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Portland, NY
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is January (14.2mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity in September
Portland, NY
- Average humidity in September: 77%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is September (77%).
Average rainfall in September
Portland, NY
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is October (3.27").
The driest month (with the least rainfall) is September (2.24").
Average rainfall days in September
Portland, NY
- Average rainfall days in September: 16.2 days
The month with the highest number of rainy days is October (19.2 days).
The month with the least rainy days is January (8.1 days).
Average snowfall in September
Portland, NY
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.75").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Portland, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (16 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Portland, NY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in September
Portland, NY
- Average sunshine days in September: 11.3 days
The month with the most sunshine days is September (11.3 days).
The month with the least sunshine days is January (5.4 days).
Average UV index in September
Portland, NY
- Average UV index in September: 4
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
Portland, NY
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Portland, NY
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
