September weather forecast
Valparaiso, FL

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Weather in September

September, the first month of the autumn in Valparaiso, is also a moderately hot month, with temperature in the range of an average low of 74.7°F (23.7°C) and an average high of 85.8°F (29.9°C).

Temperature

September's advent denotes a minor fluctuation in the average high-temperature to a moderately hot 85.8°F (29.9°C) from August's 88.3°F (31.3°C). During the month of September, an average temperature of 74.7°F (23.7°C) is noted during the nights.

Heat index

During September, the heat index is estimated at a very hot 96.8°F (36°C). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', comes about by integrating the temperature readings with the humidity levels. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

In September, the average relative humidity in Valparaiso is 73%.

Rainfall

In September, the rain falls for 18.5 days. Throughout September, 3.07" (78mm) of precipitation is accumulated. Throughout the year, in Valparaiso, there are 169.5 rainfall days, and 36.77" (934mm) of precipitation is accumulated.

Snowfall

February through December are months without snowfall.

Ocean temperature

In Valparaiso, the average seawater temperature in September is 83.1°F (28.4°C).
Note: With water temperature from 77°F (25°C) to 84.2°F (29°C), all water activities are comfortable and delightful, devoid of discomfort even for lengthened periods.

Daylight

In Valparaiso, the average length of the day in September is 12h and 20min.
On the first day of September in Valparaiso, sunrise is at 6:23 am and sunset at 7:08 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 6:32 pm CDT.

Sunshine

In September, the average sunshine is 9.4h.

UV index

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, an average UV index of 6 transforms into the following instructions:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Heed this! UV intensity is much stronger when reflected off sand and water.
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Frequently asked questions

How hot is September in Valparaiso?

In Valparaiso, 85.8°F (29.9°C) is the average high-temperature and 74.7°F (23.7°C) is the average low-temperature during September. In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is estimated at 96.8°F (36°C).

What is the average humidity in September in Valparaiso?

The average relative humidity in September in Valparaiso, Florida, is 73%.

How many days does it rain in September in Valparaiso?

In Valparaiso, Florida, during September, the rain falls for 18.5 days and regularly aggregates up to 3.07" (78mm) of precipitation.

When it does not snow in Valparaiso?

February through December are months without snowfall in Valparaiso, Florida.

What is the water temperature in September in Valparaiso?

In Valparaiso, Florida, the average seawater temperature in September is 83.1°F (28.4°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

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

In Valparaiso, the average day length in September is 12h and 20min.

When is the sunrise / sunset in September in Valparaiso?

On the first day of September in Valparaiso, Florida, sunrise is at 6:23 am and sunset at 7:08 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 6:32 pm CDT.

How many hours of sunshine does Valparaiso have in September?

In September, the average sunshine duration in Valparaiso is 9.4h.

What is the UV index reading in September in Valparaiso?

In Valparaiso, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health threat from 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
Valparaiso, FL

Average temperature in September - Valparaiso, FL
  • Average high temperature in September: 85.8°F

The warmest months (with the highest average high temperature) are July and August (88.3°F).
The month with the lowest average high temperature is January (59.7°F).

  • Average low temperature in September: 74.7°F

The month with the highest average low temperature is August (79.2°F).
The coldest month (with the lowest average low temperature) is January (48°F).

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Average pressure in September
Valparaiso, FL

Average pressure in September - Valparaiso, FL
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).

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Average wind speed in September
Valparaiso, FL

Average wind speed in September - Valparaiso, FL
  • Average wind speed in September: 7.1mph

The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity in September
Valparaiso, FL

Average humidity in September - Valparaiso, FL
  • Average humidity in September: 73%

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is October (68%).

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Average rainfall in September
Valparaiso, FL

Average rainfall in September - Valparaiso, FL
  • Average rainfall in September: 3.07"

The wettest month (with the highest rainfall) is August (5.55").
The driest month (with the least rainfall) is May (1.57").

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Average rainfall days in September
Valparaiso, FL

Average rainfall days in September - Valparaiso, FL
  • Average rainfall days in September: 18.5 days

The month with the highest number of rainy days is August (24.5 days).
The month with the least rainy days is November (7.5 days).

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Average snowfall in September
Valparaiso, FL

Average snowfall in September - Valparaiso, FL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Valparaiso, FL

Average snowfall days in September - Valparaiso, FL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

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Average sea temperature in September
Valparaiso, FL

Average sea temperature in September - Valparaiso, FL
  • Average sea temperature in September: 83.1°F

The best month for swimming (with the highest average sea temperature) is August (86°F).
The coldest month (with the lowest average sea temperature) is February (61.5°F).

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Average daylight in September /
Average sunshine in September
Valparaiso, FL

Average daylight in September / Average sunshine in September - Valparaiso, FL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is June (Average sunshine: 11h and 12min).
The months with the least sunshine are February and December (Average sunshine: 5h and 30min).

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Average sunshine days in September
Valparaiso, FL

Average sunshine days in September - Valparaiso, FL
  • Average sunshine days in September: 8.5 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is August (4.3 days).

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Average UV index in September
Valparaiso, FL

Average UV index in September - Valparaiso, FL
  • Average UV index in September: 6

The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January, February and December (UV index 4).

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Average cloud cover in September
Valparaiso, FL

Average cloud cover in September - Valparaiso, FL
  • Average cloud cover in September: 25

The months with the most cloud cover are February and December (Cloud cover 40).
The month with the least cloud cover is October (Cloud cover 22).

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Average visibility in September
Valparaiso, FL

Average visibility in September - Valparaiso, FL
  • 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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Valparaiso, Florida, USA

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