September weather forecast
Waterbury, VT

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Weather in September

September carries the first signs of autumn in Waterbury, veering away from the heat of August. While the temperature remains relatively high at 68.4°F (20.2°C), the autumn vibes subtly mark their arrival. The daylight hours begin to decline, and the city prepares to welcome cooler temperatures. The green foliage starts turning into stunning hues of red and orange, offering a breathtaking spectacle.

Temperature

September's arrival subtly correlates with a reduction in the average high-temperature, down from a moderately hot 75.4°F (24.1°C) in August to an agreeable 68.4°F (20.2°C). An average minimum temperature of 47.8°F (8.8°C) is recorded during the month of September.

Humidity

The average relative humidity in September is 80%.

Rainfall

The month with the least rainfall is September, when the rain falls for 13.2 days and typically collects 1.97" (50mm) 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 6:14 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:33 pm EDT.

Sunshine

The average sunshine in September is 8.3h.

UV index

The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: An average maximum UV index of 3 in September leads to these recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Updated: Jul 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The high-temperature, in September, in Waterbury, is 68.4°F (20.2°C), while the low-temperature averages to 47.8°F (8.8°C).

What is the average humidity in September?

In Waterbury, the average relative humidity in September is 80%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 13.2 days and accumulates 1.97" (50mm) of precipitation.

How many days does it rain in September?

In Waterbury, in September, during 13.2 rainfall days, 1.97" (50mm) of precipitation is typically accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in Waterbury in September?

In Waterbury, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September?

In Waterbury, the average day length in September is 12h and 30min.

When is the sunrise / sunset in September in Waterbury?

On the first day of September, sunrise is at 6:14 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:33 pm EDT.

How many hours of sunshine does Waterbury have in September?

The average sunshine duration in September is 8.3h.

How high is the UV index in September?

In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Waterbury, VT

Average temperature in September - Waterbury, VT
  • Average high temperature in September: 68.4°F

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (23.4°F).

  • Average low temperature in September: 47.8°F

The month with the highest average low temperature is July (55.4°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).

Average pressure in September
Waterbury, VT

Average pressure in September - Waterbury, VT
  • 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
Waterbury, VT

Average wind speed in September - Waterbury, VT
  • Average wind speed in September: 5.4mph

The windiest month (with the highest average wind speed) is April (7.2mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in September
Waterbury, VT

Average humidity in September - Waterbury, 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
Waterbury, VT

Average rainfall in September - Waterbury, VT
  • Average rainfall in September: 1.97"

The wettest month (with the highest rainfall) is June (3.31").
The driest month (with the least rainfall) is September (1.97").

Average rainfall days in September
Waterbury, VT

Average rainfall days in September - Waterbury, VT
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is June (19.1 days).
The month with the least rainy days is January (7.7 days).

Average snowfall in September
Waterbury, VT

Average snowfall in September - Waterbury, VT
  • Average snowfall in September: 0"

The month with the highest snowfall is February (11.85").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Waterbury, VT

Average snowfall days in September - Waterbury, VT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (21.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Waterbury, VT

Average daylight in September / Average sunshine in September - Waterbury, 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 month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is February (Average sunshine: 2h and 36min).

Average sunshine days in September
Waterbury, VT

Average sunshine days in September - Waterbury, VT
  • Average sunshine days in September: 14.3 days

The month with the most sunshine days is September (14.3 days).
The month with the least sunshine days is February (4.8 days).

Average UV index in September
Waterbury, VT

Average UV index in September - Waterbury, 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 and December (UV index 1).

Average cloud cover in September
Waterbury, VT

Average cloud cover in September - Waterbury, VT
  • Average cloud cover in September: 40

The month with the most cloud cover is February (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 38).

Average visibility in September
Waterbury, VT

Average visibility in September - Waterbury, 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).

Waterbury, Vermont, USA

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