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
As August shifts into September, a minor alteration in temperatures is observed, with average highs reducing from a warm 84.4°F (29.1°C) to a still moderately hot 77.9°F (25.5°C). Throughout September, Tristan experiences a low-temperature average of 56.7°F (13.7°C).Humidity
In Tristan, the average relative humidity in September is 77%.Rainfall
The month with the least rainfall is September, when the rain falls for 14.2 days and typically collects 2.05" (52mm) of precipitation.Snowfall
In Tristan, snow does not fall in June through September.Daylight
In Tristan, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:54 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:08 pm EDT.
Sunshine
The average sunshine in September in Tristan is 8.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: In September, a regular UV index of 4 translates into these guidelines:
Take precautions - Protection against sun damage is advised. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September in Tristan?
What is the driest month?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Tristan have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Tristan, WV
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in September: 56.7°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in September
Tristan, WV
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Tristan, WV
- Average wind speed in September: 4.4mph
The windiest month (with the highest average wind speed) is February (6.7mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in September
Tristan, WV
- Average humidity in September: 77%
The months with the highest relative humidity are January and February (82%).
The months with the lowest relative humidity are June and August (76%).
Average rainfall in September
Tristan, WV
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in September
Tristan, WV
- Average rainfall days in September: 14.2 days
The month with the highest number of rainy days is May (21.3 days).
The month with the least rainy days is November (11.5 days).
Average snowfall in September
Tristan, WV
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.39").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Tristan, WV
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Tristan, WV
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Tristan, WV
- Average sunshine days in September: 12.8 days
The month with the most sunshine days is November (16.7 days).
The month with the least sunshine days is May (7.9 days).
Average UV index in September
Tristan, WV
- Average UV index in September: 4
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 and December (UV index 2).
Average cloud cover in September
Tristan, WV
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Tristan, WV
- Average visibility in September: 5mi
The months with the highest visibility are April and November (6mi).
The month with the lowest visibility is January (4mi).
Tristan, West Virginia, USA
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