September weather forecast
Ottawa, WV

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Weather in September

The first month of the autumn, September, is still a warm month in Ottawa, West Virginia, with temperature in the range of an average high of 77.9°F (25.5°C) and an average low of 56.5°F (13.6°C).

Temperature

September is characterized by a slight reduction in average high-temperature, easing from 84°F (28.9°C) in August to a still moderately hot 77.9°F (25.5°C). The nighttime temperature dips to a refreshing 56.5°F (13.6°C) on average during September.

Humidity

In September, the average relative humidity is 78%.

Rainfall

The month with the least rainfall in Ottawa is September, when the rain falls for 12.8 days and typically collects 1.77" (45mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of September, sunrise is at 6:57 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:11 pm EDT.

Sunshine

In Ottawa, the average sunshine in September is 8.1h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum daily UV index of 4 during September morphs into the following directions:
Undertake protective steps - Preventing sun damage is advised. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

In Ottawa, 77.9°F (25.5°C) is the average high-temperature and 56.5°F (13.6°C) is the average low-temperature during September. In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 93.2°F (34°C).

What is the average humidity in September in Ottawa?

The average relative humidity in September is 78%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 12.8 days and accumulates 1.77" (45mm) of precipitation.

How many days does it rain in September?

In Ottawa, in September, it is raining for 12.8 days, with typically 1.77" (45mm) of accumulated precipitation.

When it does not snow?

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

Does it snow in September?

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

What is the average length of the day in September in Ottawa?

The average day length in September is 12h and 25min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:57 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:11 pm EDT.

How many hours of sunshine does Ottawa have in September?

The average sunshine duration in September is 8.1h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.
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
Ottawa, WV

Average temperature in September - Ottawa, WV
  • Average high temperature in September: 77.9°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (39°F).

  • Average low temperature in September: 56.5°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).

Average pressure in September
Ottawa, WV

Average pressure in September - Ottawa, WV
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

Average wind speed in September
Ottawa, WV

Average wind speed in September - Ottawa, WV
  • Average wind speed in September: 4.3mph

The windiest months (with the highest average wind speed) are January and February (6.6mph).
The calmest month (with the lowest average wind speed) is August (4mph).

Average humidity in September
Ottawa, WV

Average humidity in September - Ottawa, WV
  • Average humidity in September: 78%

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are June, July, August and November (76%).

Average rainfall in September
Ottawa, WV

Average rainfall in September - Ottawa, WV
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is May (3.74").
The driest month (with the least rainfall) is September (1.77").

Average rainfall days in September
Ottawa, WV

Average rainfall days in September - Ottawa, WV
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is May (20.6 days).
The month with the least rainy days is November (10.9 days).

Average snowfall in September
Ottawa, WV

Average snowfall in September - Ottawa, WV
  • Average snowfall in September: 0"

The months with the highest snowfall are January and February (5.12").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Ottawa, WV

Average snowfall days in September - Ottawa, WV
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Ottawa, WV

Average daylight in September / Average sunshine in September - Ottawa, WV
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in September
Ottawa, WV

Average sunshine days in September - Ottawa, WV
  • Average sunshine days in September: 14.9 days

The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is February (8.7 days).

Average UV index in September
Ottawa, WV

Average UV index in September - Ottawa, WV
  • Average UV index in September: 4

The months with the highest UV index are 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
Ottawa, WV

Average cloud cover in September - Ottawa, WV
  • Average cloud cover in September: 38

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 33).

Average visibility in September
Ottawa, WV

Average visibility in September - Ottawa, WV
  • Average visibility in September: 5mi

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

Ottawa, West Virginia, USA

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