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
With the arrival of September, Helvetia notices a mild change in the average high-temperature, sliding from August's 80.8°F (27.1°C) to a still moderately hot 75.2°F (24°C). Helvetia, in September, observes a steady average low-temperature of 54.3°F (12.4°C).Humidity
The average relative humidity in September is 78%.Rainfall
The month with the least rainfall is September, when the rain falls for 14.4 days and typically collects 1.89" (48mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Helvetia, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:50 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:16 am and sunset at 7:04 pm EDT.
Sunshine
In Helvetia, the average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
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?
What is the driest month?
How many days does it rain in September in Helvetia?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Helvetia have in September?
How high is the UV index in September?
Average temperature in September
Helvetia, WV
- Average high temperature in September: 75.2°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in September: 54.3°F
The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in September
Helvetia, WV
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Helvetia, WV
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is February (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in September
Helvetia, WV
- Average humidity in September: 78%
The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are June, July, August and November (77%).
Average rainfall in September
Helvetia, WV
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is May (4.33").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in September
Helvetia, WV
- Average rainfall days in September: 14.4 days
The month with the highest number of rainy days is May (21.3 days).
The month with the least rainy days is February (11.4 days).
Average snowfall in September
Helvetia, WV
- Average snowfall in September: 0"
The month with the highest snowfall is January (9.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Helvetia, WV
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (17.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Helvetia, 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 4min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Helvetia, WV
- Average sunshine days in September: 12.9 days
The month with the most sunshine days is November (13.2 days).
The month with the least sunshine days is February (7.2 days).
Average UV index in September
Helvetia, WV
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Helvetia, WV
- Average cloud cover in September: 38
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Helvetia, WV
- Average visibility in September: 5mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is January (4mi).
Helvetia, West Virginia, USA
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