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 moderately hot 76.8°F (24.9°C) to an agreeable 69.3°F (20.7°C). An average low-temperature of 48.9°F (9.4°C) is observed during September nights in Lewis.Humidity
In September, the average relative humidity in Lewis is 78%.Rainfall
The month with the least rainfall in Lewis is September, when the rain falls for 11.1 days and typically collects 1.65" (42mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 30min.On the first day of September, sunrise is at 6:18 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:36 pm EDT.
Sunshine
In September, the average sunshine in Lewis is 9h.UV index
The average daily maximum UV index in September in Lewis is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: A maximum daily UV index of 3 during September morphs into the following directions:
Take necessary precautions - Suggestions to elude sunburn are provided. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Frequently asked questions
What is the usual temperature for Lewis in September?
What is the average humidity in September in Lewis?
What is the driest month in Lewis?
How much does it rain in Lewis in September?
When it does not snow in Lewis?
Does it snow in Lewis in September?
How many hours of daylight does Lewis have in September?
What time are sunrise and sunset in September in Lewis?
How long on average sun shines in September in Lewis?
What is the UV index reading in September in Lewis?
Average temperature in September
Lewis, NY
- Average high temperature in September: 69.3°F
The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (24.8°F).
- Average low temperature in September: 48.9°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).
Average pressure in September
Lewis, NY
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Lewis, NY
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in September
Lewis, NY
- Average humidity in September: 78%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is May (75%).
Average rainfall in September
Lewis, NY
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is September (1.65").
Average rainfall days in September
Lewis, NY
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is February (10.4 days).
Average snowfall in September
Lewis, NY
- Average snowfall in September: 0"
The month with the highest snowfall is February (12.05").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Lewis, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (19.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lewis, NY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).
Average sunshine days in September
Lewis, NY
- Average sunshine days in September: 16.7 days
The month with the most sunshine days is September (16.7 days).
The month with the least sunshine days is February (7.6 days).
Average UV index in September
Lewis, 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
Lewis, NY
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Lewis, NY
- Average visibility in September: 5mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is February (4mi).
Lewis, New York, USA
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