September weather forecast
Piti, GU

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Weather in September

September in Piti is characterized by steady, warm temperatures with a moderate decrease in rainfall compared to August. The climate remains warm, enticing inhabitants and tourists to indulge in outdoor activities and explore the city landscapes. Approaching October, expect a minimal decrease in temperature and lesser daylight hours. The decreased rainfall of 10.28" (261mm) in September does not drastically affect the overall vibrant lifestyle of Piti.

Temperature

Piti marks the onset of September with an average high-temperature of a still moderately hot 84.4°F (29.1°C), a subtle shift from August's 84.7°F (29.3°C). The nights of September in Piti cool down to an average low of 82.8°F (28.2°C), subtly lower than daytime highs.

Heat index

September's average heat index is appraised at a tropical 93.2°F (34°C). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.

Humidity

In Piti, the average relative humidity in September is 77%.

Rainfall

September is the month with the most rainfall. Rain falls for 28.1 days and accumulates 10.28" (261mm) of precipitation.

Ocean temperature

In Piti, the average seawater temperature in September is 85.1°F (29.5°C).
Note: For any water activity, having surface water temperatures from 77°F (25°C) to 84.2°F (29°C) is considered outstanding and highly delightful for lengthened periods.

Daylight

In September, the average length of the day in Piti is 12h and 13min.
On the first day of the month, sunrise is at 6:09 am and sunset at 6:32 pm. On the last day of September, sunrise is at 6:10 am and sunset at 6:11 pm ChST.

Sunshine

The average sunshine in September is 7.9h.

UV index

September is the month with the lowest UV index, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the maximum UV index of 6 suggests these recommendations:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. During bright days, sunglasses that offer UVA and UVB defense are recommended. Notice! The Sun's UV exposure elevates with sand and water reflections.

Frequently asked questions

How hot is September?

In Piti, 84.4°F (29.1°C) is the average high-temperature and 82.8°F (28.2°C) is the average low-temperature during September. The average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, in September is appraised at 93.2°F (34°C).

What is the average humidity in September?

The average relative humidity in September is 77%.

What is the rainiest month?

September is the month with the most rainfall. Rain falls for 28.1 days and accumulates 10.28" (261mm) of precipitation.

How much does it rain in September?

In Piti, in September, it is raining for 28.1 days, with typically 10.28" (261mm) of accumulated precipitation.

What is the ocean temperature in September?

In September, the average ocean temperature is 85.1°F (29.5°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in September?

In Piti, Guam, the average day length in September is 12h and 13min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:09 am and sunset at 6:32 pm. On the last day of the month, sunrise is at 6:10 am and sunset at 6:11 pm ChST.

How many hours of sunshine does Piti have in September?

In September, the average sunshine duration is 7.9h.

When is the lowest UV index?

With an average maximum UV index of 6, September is the month with the lowest UV index.

How high is the UV index in September?

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unprotected exposure to UV radiation.

Average temperature in September
Piti, GU

Average temperature in September - Piti, GU
  • Average high temperature in September: 84.4°F

The warmest months (with the highest average high temperature) are July and August (84.7°F).
The month with the lowest average high temperature is February (81.7°F).

  • Average low temperature in September: 82.8°F

The month with the highest average low temperature is June (83.3°F).
The coldest month (with the lowest average low temperature) is February (79.7°F).

Average pressure in September
Piti, GU

Average pressure in September - Piti, GU
  • Average pressure in September: 29.79"Hg

The month with the highest atmospheric pressure is February (29.88"Hg).
The months with the lowest atmospheric pressure are August, September and October (29.79"Hg).

Average wind speed in September
Piti, GU

Average wind speed in September - Piti, GU
  • Average wind speed in September: 9.9mph

The windiest month (with the highest average wind speed) is February (16.3mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).

Average humidity in September
Piti, GU

Average humidity in September - Piti, GU
  • Average humidity in September: 77%

The months with the highest relative humidity are January, March, April, May, October, November and December (78%).
The month with the lowest relative humidity is August (76%).

Average rainfall in September
Piti, GU

Average rainfall in September - Piti, GU
  • Average rainfall in September: 10.28"

The wettest month (with the highest rainfall) is September (10.28").
The driest month (with the least rainfall) is March (1.81").

Average rainfall days in September
Piti, GU

Average rainfall days in September - Piti, GU
  • Average rainfall days in September: 28.1 days

The months with the highest number of rainy days are July and August (28.9 days).
The month with the least rainy days is February (17.5 days).

Average sea temperature in September
Piti, GU

Average sea temperature in September - Piti, GU
  • Average sea temperature in September: 85°F

The best month for swimming (with the highest average sea temperature) is August (85.4°F).
The coldest month (with the lowest average sea temperature) is February (82°F).

Average daylight in September /
Average sunshine in September
Piti, GU

Average daylight in September / Average sunshine in September - Piti, GU
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 24min).

  • Average sunshine in September: 7h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is November (Average sunshine: 6h and 18min).

Average sunshine days in September
Piti, GU

Average sunshine days in September - Piti, GU
  • Average sunshine days in September: 1.1 days

The month with the most sunshine days is March (6.6 days).
The month with the least sunshine days is September (1.1 days).

Average UV index in September
Piti, GU

Average UV index in September - Piti, GU
  • Average UV index in September: 6

The months with the highest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 7).
The month with the lowest UV index is September (UV index 6).

Average cloud cover in September
Piti, GU

Average cloud cover in September - Piti, GU
  • Average cloud cover in September: 45

The months with the most cloud cover are January, August and October (Cloud cover 46).
The months with the least cloud cover are May and June (Cloud cover 39).

Average visibility in September
Piti, GU

Average visibility in September - Piti, GU
  • 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).

Piti, Guam, USA

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