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
September witnesses a gentle descent in average high-temperature, descending from August's warm 78.1°F (25.6°C) to a pleasant 72.1°F (22.3°C). An average temperature of 65.3°F (18.5°C) is logged during the nights of September, a small step down from daytime highs.Humidity
In September, the average relative humidity is 74%.Rainfall
In Ronkonkoma, in September, during 12.8 rainfall days, 2.48" (63mm) of precipitation is typically accumulated. In 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 Ronkonkoma, New York, the average length of the day in September is 12h and 27min.On the first day of September in Ronkonkoma, New York, sunrise is at 6:20 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:35 pm EDT.
Sunshine
The average sunshine in September is 9.2h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum UV index of 5 in September translates into the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. Around midday, solar radiation is most harmful; hence, exposure should be limited. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Frequently asked questions
What is the temperature in September in Ronkonkoma?
What is the average humidity in September in Ronkonkoma?
How much does it rain in Ronkonkoma in September?
When it does not snow in Ronkonkoma?
Does it snow in Ronkonkoma in September?
How many hours of daylight does Ronkonkoma have in September?
What time are sunrise and sunset in September in Ronkonkoma?
How long on average sun shines in September in Ronkonkoma?
How high is the UV index in September in Ronkonkoma?
Average temperature in September
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
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
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
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
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
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
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
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
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
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
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
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
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).
Ronkonkoma, New York, USA
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