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
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's warm 78.1°F (25.6°C) to an agreeable 72.1°F (22.3°C). In September, Lake Ronkonkoma temperatures settle at a low of 65.3°F (18.5°C) during the nights, reflecting a minor change from daytime highs.Humidity
In September, the average relative humidity in Lake Ronkonkoma is 74%.Rainfall
In Lake Ronkonkoma, in September, it is raining for 12.8 days, with typically 2.48" (63mm) of accumulated precipitation. In Lake Ronkonkoma, during the entire year, the rain falls for 155.3 days and collects up to 34.84" (885mm) of precipitation.Snowfall
April, June through September and November are months without snowfall.Daylight
In Lake Ronkonkoma, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:35 pm EDT.
Sunshine
In September, the average sunshine in Lake Ronkonkoma is 9.2h.UV index
In Lake Ronkonkoma, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: An average maximum UV index of 5 in September leads to these recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
What is the temperature in September in Lake Ronkonkoma?
What is the average humidity in September in Lake Ronkonkoma?
How many days does it rain in September in Lake Ronkonkoma?
When it does not snow in Lake Ronkonkoma?
Does it snow in Lake Ronkonkoma in September?
What is the average length of the day in September in Lake Ronkonkoma?
When are sunrise and sunset in September in Lake Ronkonkoma?
How many hours of sunshine does Lake Ronkonkoma have in September?
How high is the UV index in September in Lake Ronkonkoma?
Average temperature in September
Lake Ronkonkoma, NY
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in September: 65.3°F
The month with the highest average low temperature is August (71.8°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).
Average pressure in September
Lake Ronkonkoma, NY
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Lake Ronkonkoma, NY
- Average wind speed in September: 10.4mph
The windiest month (with the highest average wind speed) is January (13.8mph).
The calmest months (with the lowest average wind speed) are July and August (9mph).
Average humidity in September
Lake Ronkonkoma, NY
- Average humidity in September: 74%
The months with the highest relative humidity are May and June (78%).
The month with the lowest relative humidity is November (71%).
Average rainfall in September
Lake Ronkonkoma, NY
- Average rainfall in September: 2.48"
The wettest month (with the highest rainfall) is December (3.74").
The driest month (with the least rainfall) is January (2.17").
Average rainfall days in September
Lake Ronkonkoma, NY
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in September
Lake Ronkonkoma, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.13").
The months with the least snowfall are April, June, July, August, September and November (0").
Average snowfall days in September
Lake Ronkonkoma, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lake Ronkonkoma, NY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Lake Ronkonkoma, NY
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Lake Ronkonkoma, NY
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March and December (UV index 2).
Average cloud cover in September
Lake Ronkonkoma, NY
- Average cloud cover in September: 31
The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Lake Ronkonkoma, NY
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Lake Ronkonkoma, New York, USA
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