Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The onset of September is marked by a minor decrease in temperature, transitioning from a warm 76.5°F (24.7°C) in August to an agreeable 69.6°F (20.9°C). Grotto, during September nights, observes an average temperature of 50.9°F (10.5°C).Humidity
In September, the average relative humidity is 81%.Rainfall
In Grotto, during September, the rain falls for 11.8 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, there are 143 rainfall days, and 21.3" (541mm) of precipitation is accumulated.Snowfall
In Grotto, New York, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 29min.On the first day of September, sunrise is at 6:31 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:48 pm EDT.
Sunshine
In Grotto, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: A daily high UV index of 3 in September leads to these guidelines:
Be vigilant - Suggestions to stave off sun damage are provided. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in Grotto in September?
How many hours of daylight does Grotto have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Grotto have in September?
What is the UV index intensity in September?
Average temperature in September
Grotto, NY
- Average high temperature in September: 69.6°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (27.5°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 (16.2°F).
Average pressure in September
Grotto, NY
- Average pressure in September: 30.06"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
Grotto, NY
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is January (10mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity in September
Grotto, NY
- Average humidity in September: 81%
The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are April and May (79%).
Average rainfall in September
Grotto, NY
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is June (2.44").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in September
Grotto, NY
- Average rainfall days in September: 11.8 days
The months with the highest number of rainy days are May and July (17.1 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in September
Grotto, NY
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.17").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grotto, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (15.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grotto, NY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 4min
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 30min).
Average sunshine days in September
Grotto, NY
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is September (15.9 days).
The month with the least sunshine days is February (9.3 days).
Average UV index in September
Grotto, 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, February and December (UV index 1).
Average cloud cover in September
Grotto, NY
- Average cloud cover in September: 38
The months with the most cloud cover are January and February (Cloud cover 74).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in September
Grotto, NY
- Average visibility in September: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
Grotto, New York, USA
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