September weather forecastSaint Johnsbury, VT
September
Weather in September
September in Saint Johnsbury, Vermont, rings in autumnal chill alongside lingering summer warmth. The foliage begins to turn, swathing the environment in hues of gold and red. The outdoor splendor becomes a picturesque panorama for shutterbugs. The month witnesses temperatures ranging from a maximum of 67.8°F (19.9°C), while the coolness of 47.1°F (8.4°C) marks nights. It is a time of serenity, when nature seems to slow its pace, prepping for the approaching winters.Temperature
The onset of September results in a small decrease in the average high-temperature, moderately receding from a warm 75°F (23.9°C) in August to an enjoyable 67.8°F (19.9°C). Saint Johnsbury witnesses an average low-temperature of 47.1°F (8.4°C) throughout the month of September.Humidity
In Saint Johnsbury, the average relative humidity in September is 80%.Rainfall
September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.97" (50mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Saint Johnsbury, Vermont, the average length of the day in September is 12h and 30min.On the first day of September, sunrise is at 6:11 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:30 pm EDT.
Sunshine
The average sunshine in September is 8.4h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Put precautions into practice - Protective measures against sun-induced damage are advised. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint Johnsbury, VT
- Average high temperature in September: 67.8°F
The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is January (22.8°F).
- Average low temperature in September: 47.1°F
The month with the highest average low temperature is July (54.5°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).
Average pressure in September
Saint Johnsbury, VT
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Saint Johnsbury, VT
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Saint Johnsbury, VT
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (76%).
Average rainfall in September
Saint Johnsbury, VT
- Average rainfall in September: 1.97"
The wettest months (with the highest rainfall) are June and October (2.87").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in September
Saint Johnsbury, VT
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is January (6.1 days).
Average snowfall in September
Saint Johnsbury, VT
- Average snowfall in September: 0"
The month with the highest snowfall is January (12.44").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Saint Johnsbury, VT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (20.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Saint Johnsbury, VT
- Average daylight in September: 12h and 30min
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: 8h and 24min
The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 2h and 48min).
Average sunshine days in September
Saint Johnsbury, VT
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is February (6.6 days).
Average UV index in September
Saint Johnsbury, VT
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in September
Saint Johnsbury, VT
- Average cloud cover in September: 40
The month with the most cloud cover is February (Cloud cover 73).
The months with the least cloud cover are July and August (Cloud cover 39).
Average visibility in September
Saint Johnsbury, VT
- Average visibility in September: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February, March and December (4mi).
