On average, the warmest month is May. The rainy season runs from June to November when annual Belize rainfall is highest. Mean Temp: 80 °F. During the coolest months (December, January and February), the average temperature is around 23 degrees Celsius (73 °F) in the north, 24 °C (75 °F) in the south and 25 °C (77 °F) on the island of Ambergris Caye, with highs around 26/27 °C (79/81 °F). The prize for the worst month of the year goes to September with average rainfall of 11 inches. ... San Pedro, Belize Monthly Weather. Low Temp: 68 °F. Tropical summer thunderstorms become heavy and persistent in the south and over the mountains, while the north escapes with showers only. Temperatures maintain an average high in the upper 80s Fahrenheit that began in April. Weather.com brings you the most accurate monthly weather forecast for with average/record and high/low temperatures, precipitation and more. All Year Climate & Weather Averages in Belize City. Belize Weather (By Month In 2020) Look: The weather in Belize is generally warm; our near-the-equator setting pretty much guarantees sunlight and blue skies throughout most of the calendar year. The average annual maximum temperature is: 86° Fahrenheit (30.0° Celsius) The average annual minimum temperature is: 71.6° Fahrenheit (22.0° Celsius) If you want to beat the rush of tourists and don't mind packing an umbrella, come during the rainy season in September and October. Expect showers from June to mid-November and strong winds. The last month of the spring, May, is another tropical month in Ambergris Caye, Belize, with average temperature fluctuating between 23°C (73.4°F) and 31°C (87.8°F). October Second place for worst month to visit Belize goes to October along with June and July. In Ambergris Caye, it is raining for 7 days, with typically 112mm (4.4") of accumulated precipitation. High Temp: 90 °F. Get Seasonal Outlook. Owing to both rainfall and humidity, most of Belize is covered by a tropical forest. Summer in Belize. Water in the Caribbean becomes even warmer: +29°C (84 °F). That said, Mother nature is still unpredictable and travelers may sometimes find themselves staring up at angry gray nimbus clouds, or no clouds at all. WRF Products. It … Precipitation: 2.75". Humidity: 80%. Belize has a tropical climate with an extended wet summer season running from May to November. All Year January February March April May June July August September October November December. On average, the coolest month is January. Average air temperatures range from +31°C (88 °F) during the day to +23°C (73 °F) at night. Daily weather discussions and monthly weather summaries are provided to help authorities prepare for, and respond to, emergencies that can have a major impact on the Belizean society. April through September, with an average high-temperature of 31°C (87.8°F), are the warmest months. The early months of May and June when rainfall is just getting underway, are a good time to travel to Belize as you can escape the tourist rush and hotel rates tend to be lower. June is the month of the beginning of the rainy season, at least once in two days heavy rains pass here.