September weather forecast
Bethesda, IA

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Weather in September

The first month of the autumn, September, is still a warm month in Bethesda, Iowa, with an average temperature ranging between max 76.6°F (24.8°C) and min 57°F (13.9°C).

Temperature

The arrival of September correlates with a minor temperature reduction, down from August's 82.2°F (27.9°C) to a still moderately hot 76.6°F (24.8°C). In Bethesda, an average nighttime temperature of 57°F (13.9°C) is expected during September.

Humidity

The average relative humidity in September in Bethesda, Iowa, is 75%.

Rainfall

In September, in Bethesda, the rain falls for 10.1 days. Throughout September, 1.34" (34mm) of precipitation is accumulated. In Bethesda, during the entire year, the rain falls for 114.9 days and collects up to 18.39" (467mm) of precipitation.

Snowfall

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

Daylight

In Bethesda, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:48 am and sunset at 7:52 pm. On the last day of September, in Bethesda, sunrise is at 7:16 am and sunset at 7:03 pm CDT.

Sunshine

The average sunshine in September in Bethesda is 9.3h.

UV index

In Bethesda, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In September, an average UV index of 5 transforms into the following instructions:
Prioritize safety - Recommendations to avert sunburn are shared. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Experience reduced UV exposure by about half when donning a wide-brim hat.
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Frequently asked questions

What is the average September temperature in Bethesda?

Bethesda in September has an average high-temperature of 76.6°F (24.8°C) and an average low-temperature of 57°F (13.9°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, is calculated to be 89.6°F (32°C).

What is the average humidity in September in Bethesda?

The average relative humidity in September in Bethesda, Iowa, is 75%.

How many days does it rain in September in Bethesda?

In September, in Bethesda, the rain falls for 10.1 days. Throughout September, 1.34" (34mm) of precipitation is accumulated.

When it does not snow in Bethesda?

In Bethesda, Iowa, snow does not fall in May through September.

Does it snow in Bethesda in September?

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

How many hours of daylight does Bethesda have in September?

In September, the average day length is 12h and 27min.

When are sunrise and sunset in September in Bethesda?

In September, on the first day of the month, sunrise is at 6:48 am and sunset at 7:52 pm. On the last day of the month, in Bethesda, sunrise is at 7:16 am and sunset at 7:03 pm CDT.

How long on average sun shines in September in Bethesda?

In September, the average sunshine duration in Bethesda is 9.3h.

What is the UV index reading in September in Bethesda?

In Bethesda, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability 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
Bethesda, IA

Average temperature in September - Bethesda, IA
  • Average high temperature in September: 76.6°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (31.1°F).

  • Average low temperature in September: 57°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).

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Average pressure in September
Bethesda, IA

Average pressure in September - Bethesda, IA
  • Average pressure in September: 30"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in September
Bethesda, IA

Average wind speed in September - Bethesda, IA
  • Average wind speed in September: 8mph

The windiest month (with the highest average wind speed) is March (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).

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Average humidity in September
Bethesda, IA

Average humidity in September - Bethesda, IA
  • Average humidity in September: 75%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is October (69%).

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Average rainfall in September
Bethesda, IA

Average rainfall in September - Bethesda, IA
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is June (3.39").
The driest month (with the least rainfall) is February (0.43").

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Average rainfall days in September
Bethesda, IA

Average rainfall days in September - Bethesda, IA
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is February (3.4 days).

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Average snowfall in September
Bethesda, IA

Average snowfall in September - Bethesda, IA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.17").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Bethesda, IA

Average snowfall days in September - Bethesda, IA
  • 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).

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Average daylight in September /
Average sunshine in September
Bethesda, IA

Average daylight in September / Average sunshine in September - Bethesda, IA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

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Average sunshine days in September
Bethesda, IA

Average sunshine days in September - Bethesda, IA
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is June (12.3 days).

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Average UV index in September
Bethesda, IA

Average UV index in September - Bethesda, IA
  • Average UV index in September: 5

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).

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Average cloud cover in September
Bethesda, IA

Average cloud cover in September - Bethesda, IA
  • Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 27).

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Average visibility in September
Bethesda, IA

Average visibility in September - Bethesda, IA
  • Average visibility in September: 6mi

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

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Bethesda, Iowa, USA

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