September weather forecast
Delaware, OH

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Weather in September

September escorts autumn into Delaware, bringing a noticeable drop in temperature when compared to August. The city starts to morph into its fall demeanor, blending warm days with cool nights. Snowfall remains absent, maximum wind speed stands at 6.6mph (10.6km/h), allowing the residents to savor the outdoors. The rustic colors of autumn begin to cloak the city, with the weather becoming increasingly cooler as October approaches.

Temperature

The advent of September in Delaware reveals an average high-temperature of a still moderately hot 74.7°F (23.7°C), showing minimal difference from the prior month. September in Delaware, Ohio, witnesses an average low-temperature hovering around a moderate 56.1°F (13.4°C).

Humidity

In September, the average relative humidity in Delaware is 78%.

Rainfall

The month with the least rainfall in Delaware is September, when the rain falls for 14.7 days and typically collects 1.93" (49mm) of precipitation.

Snowfall

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

Daylight

In Delaware, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 7:00 am and sunset at 8:03 pm. On the last day of September, in Delaware, sunrise is at 7:28 am and sunset at 7:15 pm EDT.

Sunshine

In Delaware, the average sunshine in September is 8.2h.

UV index

The average daily maximum UV index in September in Delaware is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: The average daily UV index of 4 in September transforms into the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.

Frequently asked questions

What is the average September temperature in Delaware?

In Delaware, 74.7°F (23.7°C) is the average high-temperature and 56.1°F (13.4°C) is the average low-temperature during September. The average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in July is calculated to be 86°F (30°C).

What is the average humidity in September in Delaware?

The average relative humidity in September is 78%.

What is the driest month in Delaware?

September is the month with the least rainfall. Rain falls for 14.7 days and accumulates 1.93" (49mm) of precipitation.

How much does it rain in Delaware in September?

In Delaware, in September, it is raining for 14.7 days, with typically 1.93" (49mm) of accumulated precipitation.

When it does not snow in Delaware?

In Delaware, Ohio, snow does not fall in May through September.

Does it snow in Delaware in September?

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

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

The average day length in September in Delaware, Ohio, is 12h and 27min.

When are sunrise and sunset in September in Delaware?

On the first day of September in Delaware, sunrise is at 7:00 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:15 pm EDT.

How long on average sun shines in September in Delaware?

The average sunshine duration in September in Delaware is 8.2h.

What is the UV index reading in September in Delaware?

The average daily maximum UV index in September in Delaware is 4. A UV Index reading of 3 to 5 represents a medium health risk from unsafe 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
Delaware, OH

Average temperature in September - Delaware, OH
  • Average high temperature in September: 74.7°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (32°F).

  • Average low temperature in September: 56.1°F

The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).

Average pressure in September
Delaware, OH

Average pressure in September - Delaware, OH
  • Average pressure in September: 30.04"Hg

The months with the highest atmospheric pressure are January and November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Delaware, OH

Average wind speed in September - Delaware, OH
  • Average wind speed in September: 6.3mph

The windiest month (with the highest average wind speed) is January (10mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity in September
Delaware, OH

Average humidity in September - Delaware, OH
  • Average humidity in September: 78%

The month with the highest relative humidity is January (84%).
The months with the lowest relative humidity are October and November (75%).

Average rainfall in September
Delaware, OH

Average rainfall in September - Delaware, OH
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in September
Delaware, OH

Average rainfall days in September - Delaware, OH
  • Average rainfall days in September: 14.7 days

The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is February (10 days).

Average snowfall in September
Delaware, OH

Average snowfall in September - Delaware, OH
  • Average snowfall in September: 0"

The month with the highest snowfall is January (3.46").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Delaware, OH

Average snowfall days in September - Delaware, OH
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (13.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Delaware, OH

Average daylight in September / Average sunshine in September - Delaware, OH
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days in September
Delaware, OH

Average sunshine days in September - Delaware, OH
  • Average sunshine days in September: 13.7 days

The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is February (9.1 days).

Average UV index in September
Delaware, OH

Average UV index in September - Delaware, OH
  • 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
Delaware, OH

Average cloud cover in September - Delaware, OH
  • Average cloud cover in September: 34

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in September
Delaware, OH

Average visibility in September - Delaware, OH
  • Average visibility in September: 6mi

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

Delaware, Ohio, USA

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