September weather forecast
Dundas, VA

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Weather in September

September, the first month of the autumn in Dundas, is also a moderately hot month, with an average temperature fluctuating between 62.2°F (16.8°C) and 81°F (27.2°C).

Temperature

As August transitions into September, Dundas sees a gentle drop in the average high-temperature, transitioning from a hot 87.4°F (30.8°C) to a warm 81°F (27.2°C). An average nighttime temperature of 62.2°F (16.8°C) is recorded in Dundas during September.

Heat index

The heat index value during September is computed to be a hot 86°F (30°C). Prolonged activity during exposure might result in a state of fatigue and cause heat cramps.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'feels like', gives an indication of how one might feel in terms of heat after considering humidity. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly critical to babies and toddlers. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.

Humidity

The average relative humidity in September is 75%.

Rainfall

The month with the least rainfall is September, when the rain falls for 12.8 days and typically collects 1.93" (49mm) of precipitation.

Snowfall

In Dundas, snow does not fall in May through September.

Daylight

In Dundas, the average length of the day in September is 12h and 25min.
On the first day of September, sunrise is at 6:43 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:56 pm EDT.

Sunshine

In Dundas, the average sunshine in September is 8.6h.

UV index

In Dundas, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 5 in September translates into this advice:
Adopt protective measures - Suggestions to resist sunburn are offered. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.

Frequently asked questions

What is the usual temperature for Dundas in September?

The high-temperature, in September, in Dundas, records 81°F (27.2°C), while the low-temperature is 62.2°F (16.8°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in September is computed to be 86°F (30°C).

What is the average humidity in September?

In Dundas, the average relative humidity in September is 75%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 12.8 days and accumulates 1.93" (49mm) of precipitation.

How many days does it rain in September?

In Dundas, Virginia, in September, it is raining for 12.8 days, with typically 1.93" (49mm) of accumulated precipitation.

When it does not snow?

In Dundas, snow does not fall in May through September.

Does it snow in September?

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

How many hours of daylight does Dundas have in September?

In Dundas, Virginia, the average day length in September is 12h and 25min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:43 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:56 pm EDT.

How long on average sun shines in September?

In Dundas, the average sunshine duration in September is 8.6h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability 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
Dundas, VA

Average temperature in September - Dundas, VA
  • Average high temperature in September: 81°F

The warmest month (with the highest average high temperature) is July (90°F).
The month with the lowest average high temperature is January (45.1°F).

  • Average low temperature in September: 62.2°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (30°F).

Average pressure in September
Dundas, VA

Average pressure in September - Dundas, VA
  • Average pressure in September: 30.04"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
Dundas, VA

Average wind speed in September - Dundas, VA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is April (7.8mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in September
Dundas, VA

Average humidity in September - Dundas, VA
  • Average humidity in September: 75%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (71%).

Average rainfall in September
Dundas, VA

Average rainfall in September - Dundas, VA
  • Average rainfall in September: 1.93"

The wettest months (with the highest rainfall) are March, May and November (2.68").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in September
Dundas, VA

Average rainfall days in September - Dundas, VA
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (9.3 days).

Average snowfall in September
Dundas, VA

Average snowfall in September - Dundas, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.2").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Dundas, VA

Average snowfall days in September - Dundas, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Dundas, VA

Average daylight in September / Average sunshine in September - Dundas, VA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

Average sunshine days in September
Dundas, VA

Average sunshine days in September - Dundas, VA
  • Average sunshine days in September: 15.9 days

The month with the most sunshine days is October (19.9 days).
The month with the least sunshine days is May (12.3 days).

Average UV index in September
Dundas, VA

Average UV index in September - Dundas, VA
  • Average UV index in September: 5

The months with the highest UV index are May, 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
Dundas, VA

Average cloud cover in September - Dundas, VA
  • Average cloud cover in September: 40

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in September
Dundas, VA

Average visibility in September - Dundas, VA
  • Average visibility in September: 5mi

The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).

Dundas, Virginia, USA

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