Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The shift from August to September is characterized by an average high-temperature of a moderately hot 85.8°F (29.9°C), not significantly different from the 88.3°F (31.3°C) of August. Throughout September nights, Valparaiso registers an average low-temperature of 74.7°F (23.7°C).Heat index
For most parts of September, the heat index is appraised at a fiery hot 96.8°F (36°C). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.One should consider that heat index numbers are for shaded settings and light wind. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', integrates the air's temperature and its humidity to showcase the felt temperature by people. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.
Humidity
In September, the average relative humidity is 73%.Rainfall
In Valparaiso, during September, the rain falls for 18.5 days and regularly aggregates up to 3.07" (78mm) of precipitation. Throughout the year, 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 September, the average ocean temperature is 83.1°F (28.4°C).Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are ideal for swimming, diving, and other activities, ensuring comfort and enjoyment for lengthened periods.
Daylight
In Valparaiso, the average length of the day in September is 12h and 20min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:08 pm. On the last day of September, 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 Valparaiso, Florida, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.Note: A maximum high UV index of 6 in September translates into the following recommendations:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Beware! Reflecting off water and sand, UV rays are much stronger.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September?
How many days does it rain in September in Valparaiso?
When it does not snow?
What is the water temperature in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Valparaiso have in September?
How high is the UV index in September in Valparaiso?
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).
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).
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).
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%).
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").
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).
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").
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).
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).
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).
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).
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).
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).
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).
Valparaiso, Florida, USA
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