Weather in September
Temperature
June through October are the warmest months, with an average high-temperature of 87.8°F (31°C).Rainfall
The month with the most rainfall is September, when the rain falls for 20 days and typically aggregates up to 12.8" (325mm) of precipitation.Ocean temperature
In September, the average ocean temperature is 84.7°F (29.3°C).Note: Swimming, diving, and other activities in water temperatures between 77°F (25°C) and 84.2°F (29°C) are thought to be quite enjoyable and satisfying for extended periods, with no discomfort.
Daylight
In September, the average length of the day is 12h and 13min.On the first day of the month, sunrise is at 6:05 am and sunset at 6:29 pm. On the last day of September, sunrise is at 6:07 am and sunset at 6:07 pm ChST.
Sunshine
August through December, with an average of 5h of sunshine, are months with the least sunshine in Tinian International Airport.UV index
The months with the highest UV index are February through September, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an extreme threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In September, the average maximum UV index of 12 translates into the following recommendations:
Ensure every crucial precaution is taken. Individuals with light skin could experience burns in under 5 minutes. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Sunscreen with a sun protection factor of no less than 30 should be used liberally and reapplied frequently on overcast days, including after every swim or outdoor activity. Attention! UV radiation is ramped up when reflecting off sand and water surfaces.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the hottest?
How hot does it get in September?
What is the rainiest month?
How many days does it rain in September in Tinian International Airport?
What is the water temperature in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
What is the month with the least sunshine in Tinian International Airport?
How long on average sun shines in September?
What are the months with the highest UV index?
What is the UV index reading in September?
Average temperature in September
Tinian International Airport, Northern Mariana Islands, USA
- Average high temperature in September: 88°F
The warmest months (with the highest average high temperature) are June, July, August, September and October (88°F).
The months with the lowest average high temperature are January, February and March (84°F).
- Average low temperature in September: 77°F
The months with the highest average low temperature are May, June, July, August, September, October and November (77°F).
The coldest months (with the lowest average low temperature) are February and March (73°F).
Average rainfall in September
Tinian International Airport, Northern Mariana Islands, USA
- Average rainfall in September: 12.8"
The wettest month (with the highest rainfall) is September (12.8").
The driest month (with the least rainfall) is February (2.9").
Average rainfall days in September
Tinian International Airport, Northern Mariana Islands, USA
- Average rainfall days in September: 20 days
The month with the highest number of rainy days is August (23 days).
The month with the least rainy days is April (18 days).
Average sea temperature in September
Tinian International Airport, Northern Mariana Islands, USA
- Average sea temperature in September: 84.8°F
The best month for swimming (with the highest average sea temperature) is July (85.4°F).
The coldest months (with the lowest average sea temperature) are January, February and March (82°F).
Average daylight in September /
Average sunshine in September
Tinian International Airport, Northern Mariana Islands, USA
- Average daylight in September: 12h and 1min
The month with the longest days is June (Average daylight: 13h and 0min).
The month with the shortest days is December (Average daylight: 11h and 18min).
- Average sunshine in September: 5h
The months with the most sunshine are March, April, May and June (Average sunshine: 7h).
The months with the least sunshine are August, September, October, November and December (Average sunshine: 5h).
Average UV index in September
Tinian International Airport, Northern Mariana Islands, USA
- Average UV index in September: 12
The months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The months with the lowest UV index are November and December (UV index 9).
Tinian International Airport, Northern Mariana Islands, USA
Weather forecast for your location
2. Allow the app to use your location