Weather in September
September's climate shift is marked by a decline in sea temperature, averaging around 85°F (29.4°C). Despite the wet season continuing, the warmth of the sea still encourages water-based activities such as snorkeling and surfing. The length of daylight begins to shorten, slowly transitioning towards the end of the year. The environment continues to thrive due to the abundant rains, contributing to a picturesque natural look. Witnessing the local fauna adapt to these fluctuating conditions is a highlight for wildlife enthusiasts.
Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 77°F (25°C) to 84.2°F (29°C), without any unpleasant sensations for prolonged durations.
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 6:09 am and sunset at 6:11 pm ChST.
Ocean temperature
In Guam National Wildlife Refuge, the average seawater temperature in September is 85.1°F (29.5°C).Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 77°F (25°C) to 84.2°F (29°C), without any unpleasant sensations for prolonged durations.
Daylight
In September, the average length of the day 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 6:09 am and sunset at 6:11 pm ChST.
Updated: Jun 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the ocean temperature in September?
In Guam National Wildlife Refuge, Guam, the average seawater temperature in September is 85.1°F (29.5°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.
How many hours of daylight does Guam National Wildlife Refuge have in September?
The average day length in September is 12h and 13min.
When 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 6:09 am and sunset at 6:11 pm ChST.
Average sea temperature in September
Guam National Wildlife Refuge, 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
Guam National Wildlife Refuge, 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 18min).
Guam National Wildlife Refuge, Guam, USA
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