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 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
Grand Island's September average high-temperature settles at a still hot 88.5°F (31.4°C), showing a near match with the preceding month. In Grand Island, September is marked by an average low-temperature of 73.2°F (22.9°C).Heat index
The heat index for September is computed to be a blistering 105.8°F (41°C). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.Data suggests that the heat index is set for environments in shade and with a light wind. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.
Humidity
The months with the highest humidity are July through September, with an average relative humidity of 78%.Rainfall
In Grand Island, in September, during 22.3 rainfall days, 4.02" (102mm) of precipitation is typically accumulated. Throughout the year, in Grand Island, there are 193.1 rainfall days, and 35.71" (907mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 19min.On the first day of the month, sunrise is at 7:05 am and sunset at 7:48 pm. On the last day of September, in Grand Island, sunrise is at 7:19 am and sunset at 7:13 pm EDT.
Sunshine
In September, the average sunshine is 8.7h.UV index
In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum daily UV index of 6 during September morphs into the following directions:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot in Grand Island during September?
What are the most humid months in Grand Island?
What is the average humidity in September in Grand Island?
How much does it rain in Grand Island in September?
What is the average length of the day in September in Grand Island?
When is the sunrise / sunset in September in Grand Island?
How long on average sun shines in September in Grand Island?
How high is the UV index in September in Grand Island?
Average temperature in September
Grand Island, FL
- Average high temperature in September: 88.5°F
The warmest month (with the highest average high temperature) is August (90.9°F).
The month with the lowest average high temperature is January (67.5°F).
- Average low temperature in September: 73.2°F
The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is January (49.5°F).
Average pressure in September
Grand Island, FL
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).
Average wind speed in September
Grand Island, FL
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.4mph).
The calmest month (with the lowest average wind speed) is July (4.5mph).
Average humidity in September
Grand Island, FL
- Average humidity in September: 78%
The months with the highest relative humidity are July, August and September (78%).
The month with the lowest relative humidity is March (71%).
Average rainfall in September
Grand Island, FL
- Average rainfall in September: 4.02"
The wettest month (with the highest rainfall) is July (5.91").
The driest months (with the least rainfall) are March and November (1.26").
Average rainfall days in September
Grand Island, FL
- Average rainfall days in September: 22.3 days
The month with the highest number of rainy days is July (26.9 days).
The month with the least rainy days is January (9.2 days).
Average daylight in September /
Average sunshine in September
Grand Island, FL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in September: 8h and 4min
The months with the most sunshine are May and July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).
Average sunshine days in September
Grand Island, FL
- Average sunshine days in September: 5.7 days
The month with the most sunshine days is January (19 days).
The month with the least sunshine days is August (2.1 days).
Average UV index in September
Grand Island, FL
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 4).
Average cloud cover in September
Grand Island, FL
- Average cloud cover in September: 32
The months with the most cloud cover are February and December (Cloud cover 37).
The month with the least cloud cover is May (Cloud cover 29).
Average visibility in September
Grand Island, 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).
Grand Island, Florida, USA
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