January weather forecast and climate
Hagåtña, GU US

• Average sea temperature in January: 28.3°C

The best month for swimming (with the highest average sea temperature) is August (29.7°C).
The coldest month (with the lowest average sea temperature) is February (27.8°C).

• Average daylight in January: 11.4h

The month with the longest days is June (Average daylight: 12.9h).
The month with shortest days is December (Average daylight: 11.3h).