September weather forecast
Belize City, Belize

September brings an escalation in rainfall, with Belize City recording 287mm (11.3"), the second-highest after June. Consequently, this month witnesses fewer sunny days, but the city remains buzzing with indoor activities and attractions. The UV index drops to 12, slightly lower than in the summer months, but still requiring necessary protective measures. Despite the irregular sunshine, life in Belize City runs at its usual pace, performing its daily hustle under gray skies. Tourists are often attracted to the city's cultural events and festivals during this period.

Temperature

The start of September marks an average high-temperature of a still tropical 31°C (87.8°F), hardly distinguishable from the conditions in August. In Belize City, an average low-temperature of 23.9°C (75°F) is recorded during September nights.

Heat index

The heat index in September is calculated to be an extremely hot 42°C (107.6°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', combines both the air temperature and the humidity level to give a perceived human temperature. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

August, September, November and December, with an average relative humidity of 84%, are the most humid months.

Rainfall

September is the month with the most rainfall in Belize City. Rain falls for 15.9 days and accumulates 287mm (11.3") of precipitation.

Sea temperature

The months with the warmest seawater in Belize City are May through November, with an average sea temperature of 29°C (84.2°F).
Note: For engaging in water activities including swimming and diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are perceived as perfect, providing pleasure for extended durations.

Daylight

The average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 05:38 and sunset at 18:06. On the last day of September, in Belize City, sunrise is at 05:42 and sunset at 17:42 CST.

Sunshine

September has the least sunshine of the year, with an average of 5.9h of sunshine.

UV index

The months with the highest UV index in Belize City are March through September, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an excessive health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, a regular UV index of 12 translates into these guidelines:
Utilize all vital precautions. Guarding against sun harm is non-negotiable. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. During bright days, sunglasses that offer UVA and UVB defense are recommended. Directly after outdoor activities or swimming, a broad-spectrum sunscreen with SPF 30+ should be applied generously and reapplied frequently. Caution! The Sun's UV rays become stronger due to reflections from water and sand.