September weather forecastRock Stream, NY
September
Weather in September
September, the first month of the autumn in Rock Stream, is still a pleasant month, with temperature in the range of an average high of 70.5°F (21.4°C) and an average low of 50.9°F (10.5°C).Temperature
With the onset of September, Rock Stream experiences a modest temperature adjustment, with the average high-temperature gently receding from a warm 77.2°F (25.1°C) in August to an agreeable 70.5°F (21.4°C). In Rock Stream, an average nighttime temperature of 50.9°F (10.5°C) is expected during September.Humidity
In Rock Stream, the average relative humidity in September is 80%.Rainfall
In Rock Stream, New York, in September, during 13.5 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. Throughout the year, in Rock Stream, there are 168.6 rainfall days, and 29.69" (754mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day in Rock Stream is 12h and 29min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:41 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:50 pm EDT.
Sunshine
In Rock Stream, the average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index in Rock Stream is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 3 suggests these recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rock Stream, NY
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is July (58.3°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in September
Rock Stream, NY
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Rock Stream, NY
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in September
Rock Stream, NY
- Average humidity in September: 80%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April, May and July (78%).
Average rainfall in September
Rock Stream, NY
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is October (3.07").
The driest month (with the least rainfall) is January (1.89").
Average rainfall days in September
Rock Stream, NY
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (18.7 days).
The month with the least rainy days is February (8.1 days).
Average snowfall in September
Rock Stream, NY
- Average snowfall in September: 0"
The month with the highest snowfall is February (9.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Rock Stream, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (19.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Rock Stream, 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 42min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 2h and 54min).
Average sunshine days in September
Rock Stream, NY
- Average sunshine days in September: 15 days
The month with the most sunshine days is September (15 days).
The month with the least sunshine days is February (6.9 days).
Average UV index in September
Rock Stream, NY
- Average UV index in September: 3
The months with the highest UV index are May, 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
Rock Stream, NY
- Average cloud cover in September: 39
The month with the most cloud cover is February (Cloud cover 71).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in September
Rock Stream, NY
- Average visibility in September: 5mi
The month with the highest visibility is June (6mi).
The months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (5mi).
