September weather forecast and climate
McHenry, MD

Weather in September

The first month of the autumn, September, is still a pleasant month in McHenry, Maryland, with average temperature varying between 72.1°F (22.3°C) and 52.3°F (11.3°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 78.3°F (25.7°C) in August, to a pleasant 72.1°F (22.3°C). The average low-temperature, in September, is 52.3°F (11.3°C).

Humidity

The average relative humidity in September is 80%.

Rainfall

In McHenry, in September, it is raining for 15.5 days, with typically 2.36" (60mm) of accumulated precipitation. In McHenry, during the entire year, the rain falls for 166.5 days and collects up to 30.79" (782mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In McHenry, the average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine is 8.5h.

UV index

In September, the average daily maximum UV index in McHenry, Maryland, is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in September in McHenry?

The average relative humidity in September in McHenry, Maryland, is 80%.

How much does it rain in McHenry in September?

In McHenry, in September, during 15.5 rainfall days, 2.36" (60mm) of precipitation is typically accumulated.

When it does not snow in McHenry?

In McHenry snow does not fall in June through September.

Does it snow in McHenry in September?

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

How many hours of daylight does McHenry have in September?

In September, the average length of the day is 12.4h.

How long on average sun shines in September in McHenry?

The average sunshine in September in McHenry is 8.5h.

What is the UV index intensity in September in McHenry?

In McHenry, Maryland, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
McHenry, MD

Average temperature in September - McHenry, MD
  • Average high temperature in September: 72.1°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (32°F).

  • Average low temperature in September: 52.3°F

The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).

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Average pressure in September
McHenry, MD

Average pressure in September - McHenry, MD
  • Average pressure in September: 30.06"

The month with the highest atmospheric pressure is November (30.14").
The month with the lowest atmospheric pressure is June (29.95").

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Average wind speed in September
McHenry, MD

Average wind speed in September - McHenry, MD
  • Average wind speed in September: 5.4mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in September
McHenry, MD

Average humidity in September - McHenry, MD
  • Average humidity in September: 80%

The month with the highest relative humidity is February (87%).
Months with the lowest relative humidity are April, June, July and August (79%).

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Average rainfall in September
McHenry, MD

Average rainfall in September - McHenry, MD
  • Average rainfall in September: 2.36"

The wettest month (with the highest rainfall) is May (3.43").
The driest month (with the least rainfall) is November (1.85").

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Average rainfall days in September
McHenry, MD

Average rainfall days in September - McHenry, MD
  • Average rainfall days in September: 15.5 days

The month with the highest number of rainy days is May (20.9 days).
The month with the least rainy days is February (7.3 days).

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Average snowfall in September
McHenry, MD

Average snowfall in September - McHenry, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is February (5.28").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
McHenry, MD

Average snowfall days in September - McHenry, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (11.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
McHenry, MD

Average daylight in September / Average sunshine in September - McHenry, MD
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 8.5h

The month with the most sunshine is August (Average sunshine: 9.7h).
The month with the least sunshine is January (Average sunshine: 3.1h).

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Average sunshine days in September
McHenry, MD

Average sunshine days in September - McHenry, MD
  • Average sunshine days in September: 12.3 days

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is May (8.3 days).

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Average UV index in September
McHenry, MD

Average UV index in September - McHenry, MD
  • Average UV index in September: 4

Months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in September
McHenry, MD

Average cloud cover in September - McHenry, MD
  • Average cloud cover in September: 43

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 40).

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Average visibility in September
McHenry, MD

Average visibility in September - McHenry, MD
  • Average visibility in September: 4mi

Months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (5mi).
The month with the lowest visibility is September (4mi).

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