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 September's onset, the weather reveals a slight temperature decrease, transitioning from a warm 83.8°F (28.8°C) in August to a still moderately hot 76.3°F (24.6°C). During the month of September, the nighttime temperature falls to an average of 56.7°F (13.7°C).Humidity
In Markham, the average relative humidity in September is 78%.Rainfall
In September, the rain falls for 13.6 days. Throughout September, 2.01" (51mm) of precipitation is accumulated. In Markham, during the entire year, the rain falls for 166.6 days and collects up to 29.57" (751mm) of precipitation.Snowfall
In Markham, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:41 am and sunset at 7:41 pm. On the last day of September, in Markham, sunrise is at 7:07 am and sunset at 6:55 pm EDT.
Sunshine
The average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 4 during September leads to these advisories:
Heed the precautions - It is counselled to guard against solar damage. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Frequently asked questions
What is the average September temperature in Markham?
What is the average humidity in September in Markham?
How much does it rain in Markham in September?
When it does not snow in Markham?
Does it snow in Markham in September?
What is the average length of the day in September in Markham?
When are sunrise and sunset in September in Markham?
How many hours of sunshine does Markham have in September?
What is the UV index intensity in September in Markham?
Average temperature in September
Markham, VA
- Average high temperature in September: 76.3°F
The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is January (38.7°F).
- Average low temperature in September: 56.7°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in September
Markham, VA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Markham, VA
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is March (6.9mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in September
Markham, VA
- Average humidity in September: 78%
The month with the highest relative humidity is October (79%).
The months with the lowest relative humidity are April, June and July (74%).
Average rainfall in September
Markham, VA
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is January (1.85").
Average rainfall days in September
Markham, VA
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (9.3 days).
Average snowfall in September
Markham, VA
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Markham, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Markham, VA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
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 July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in September
Markham, VA
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is November (19.1 days).
The months with the least sunshine days are May and July (10.8 days).
Average UV index in September
Markham, VA
- Average UV index in September: 4
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, November and December (UV index 2).
Average cloud cover in September
Markham, VA
- Average cloud cover in September: 39
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Markham, VA
- Average visibility in September: 5mi
The months with the highest visibility are April, June, July, August, November and December (6mi).
The months with the lowest visibility are January, February, March, May, September and October (5mi).
Markham, Virginia, USA
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