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 September arrives, Saint Johnsbury's weather displays a minor decrease in high-temperatures, transitioning from August's moderately hot 75°F (23.9°C) to a refreshing 67.8°F (19.9°C). In Saint Johnsbury, September's nights observe an average temperature dip to a frosty 47.1°F (8.4°C).Humidity
In Saint Johnsbury, the average relative humidity in September is 80%.Rainfall
The month with the least rainfall in Saint Johnsbury is September, when the rain falls for 11.5 days and typically collects 1.97" (50mm) of precipitation.Snowfall
In Saint Johnsbury, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 6:11 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:45 am and sunset at 6:30 pm EDT.
Sunshine
In Saint Johnsbury, the average sunshine in September is 8.4h.UV index
In September, the average daily maximum UV index in Saint Johnsbury is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 3 during September translates into the following guidance:
Take precautions - Protection against sun damage is advised. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Frequently asked questions
What are September temperatures in Saint Johnsbury?
What is the average humidity in September in Saint Johnsbury?
What is the driest month in Saint Johnsbury?
How much does it rain in Saint Johnsbury in September?
When it does not snow in Saint Johnsbury?
Does it snow in Saint Johnsbury in September?
How many hours of daylight does Saint Johnsbury have in September?
What time are sunrise and sunset in September in Saint Johnsbury?
How many hours of sunshine does Saint Johnsbury have in September?
What is the UV index intensity in September in Saint Johnsbury?
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 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: 8h and 2min
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).
Saint Johnsbury, Vermont, USA
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