The climate in the Subic Bay Freeport Zone is characterized by high temperatures year-round, which is typical for a tropical region. The annual range of average monthly temperatures is relatively small: from 25.5°C in January to 28.7°C in May. The hottest months are usually April and May, when the average maximum temperature can reach 32.1°C (in April) and 31.7°C (in May). The coolest months, if one can put it that way in a tropical context, are January and February, with average minimum temperatures around 22.5°C and 22.4°C, respectively.
The so-called "summer" period, which often coincides with the rainy season (roughly from May to October), brings consistently hot and very humid weather. Average daytime temperatures during this time range from 28.4°C to 31.7°C, while nights remain warm, with temperatures rarely dropping below 24.5°C - 25.6°C. The "winter" months, from November to April, are characterized by drier weather and slightly more moderate temperatures. Although it is still hot during the day (averaging from 28.6°C to 32.1°C), nights become a bit fresher, making this period more comfortable for many visitors.
Daily temperature fluctuations in the Subic Bay Freeport Zone are noticeable, especially during the drier months from February to April. During this time, the difference between daytime highs and nightly lows can reach 7-8°C; for example, in March, the average maximum is 31.2°C, and the average minimum is 23.4°C. During the monsoon rain period, from roughly June to September, these fluctuations are smoothed out due to high humidity and cloud cover, and the temperature difference usually does not exceed 4-5°C.