September weather forecast
Hamilton, Bermuda

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Yachts on the clear blue waters of a tropical lagoon in Hamilton, Bermuda
Yachts on the clear blue waters of a tropical lagoon in Hamilton, Bermuda

Weather in September

In September, the temperatures start to decline, yet, the city remains warm. The rainfall and cloud percentage also begin to diminish. Despite these patterns, the sea temperature continues to stay high at 27.8°C (82°F), maintaining the beach season intact. With ample sunshine and fewer rainfall days, September offers considerable opportunities for outdoor exploration.

Temperature

August's transformation into September witnesses an average high-temperature of a still warm 27°C (80.6°F) in Hamilton, Bermuda, noting a minor change from the preceding month. Hamilton, during the nights of September, averages a temperature close to its daytime high, at a still warm 26.1°C (79°F).

Heat index

The heat index for September is calculated to be 29°C (84.2°F). Persisting in activity during exposure could lead to weariness and subsequently to heat cramps.
Heat index specifics point out values are for conditions of shade and a slight breeze. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', measures the perceived warmth when incorporating the humidity present in the air. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.

Humidity

In Hamilton, Bermuda, the average relative humidity in September is 76%.

Rainfall

In September, in Hamilton, the rain falls for 20.3 days. Throughout September, 89mm (3.5") of precipitation is accumulated. Throughout the year, in Hamilton, there are 201.7 rainfall days, and 804mm (31.65") of precipitation is accumulated.

Sea temperature

The months with the warmest seawater are August and September, with an average sea temperature of 27.8°C (82°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Hamilton, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 06:54 and sunset at 19:43. On the last day of September, sunrise is at 07:12 and sunset at 19:04 ADT.

Sunshine

The average sunshine in September is 9.4h.

UV index

The months with the highest UV index in Hamilton are June through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 7 in September translates into these instructions:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Stay alert! Reflective properties of sand and water amplify the Sun's UV radiation.
Updated: Jan 29, 2024 | Published by: Weather Atlas | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What is the usual temperature for Hamilton in September?

The average high-temperature, in September, in Hamilton, is 27°C (80.6°F), while the average low-temperature is 26.1°C (79°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in September is calculated to be 29°C (84.2°F).

What is the average humidity in September in Hamilton?

In September, the average relative humidity in Hamilton is 76%.

How much does it rain in Hamilton in September?

In Hamilton, in September, it is raining for 20.3 days, with typically 89mm (3.5") of accumulated precipitation.

When is the sea warmest in Hamilton?

August and September, with an average sea temperature of 27.8°C (82°F), are months with the warmest seawater in Hamilton, Bermuda.

What is the water temperature in September in Hamilton?

In Hamilton, in September, the average water temperature is 27.8°C (82°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Hamilton have in September?

The average day length in September in Hamilton, Bermuda, is 12h and 22min.

When is the sunrise / sunset in September in Hamilton?

On the first day of September in Hamilton, sunrise is at 06:54 and sunset at 19:43. On the last day of the month, sunrise is at 07:12 and sunset at 19:04 ADT.

How many hours of sunshine does Hamilton have in September?

In September, the average sunshine duration in Hamilton, Bermuda, is 9.4h.

What is the month with the highest UV index in Hamilton?

June through September, with an average maximum UV index of 7, are months with the highest UV index in Hamilton, Bermuda.

How high is the UV index in September in Hamilton?

The average daily maximum UV index in September in Hamilton is 7. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.

Average temperature in September
Hamilton, Bermuda

Average temperature in September - Hamilton, Bermuda
  • Average high temperature in September: 27°C

The warmest month (with the highest average high temperature) is August (27.9°C).
The month with the lowest average high temperature is March (18.9°C).

  • Average low temperature in September: 26.1°C

The month with the highest average low temperature is August (26.8°C).
The coldest month (with the lowest average low temperature) is March (16.9°C).

Average pressure in September
Hamilton, Bermuda

Average pressure in September - Hamilton, Bermuda
  • Average pressure in September: 1017.2mbar

The month with the highest atmospheric pressure is July (1020.8mbar).
The month with the lowest atmospheric pressure is October (1016.6mbar).

Average wind speed in September
Hamilton, Bermuda

Average wind speed in September - Hamilton, Bermuda
  • Average wind speed in September: 19.6km/h

The windiest month (with the highest average wind speed) is February (29.4km/h).
The calmest month (with the lowest average wind speed) is August (17.2km/h).

Average humidity in September
Hamilton, Bermuda

Average humidity in September - Hamilton, Bermuda
  • Average humidity in September: 76%

The month with the highest relative humidity is June (82%).
The months with the lowest relative humidity are January, November and December (74%).

Average rainfall in September
Hamilton, Bermuda

Average rainfall in September - Hamilton, Bermuda
  • Average rainfall in September: 89mm

The wettest month (with the highest rainfall) is August (93mm).
The driest month (with the least rainfall) is April (35mm).

Average rainfall days in September
Hamilton, Bermuda

Average rainfall days in September - Hamilton, Bermuda
  • Average rainfall days in September: 20.3 days

The month with the highest number of rainy days is August (21.1 days).
The month with the least rainy days is May (11.9 days).

Average sea temperature in September
Hamilton, Bermuda

Average sea temperature in September - Hamilton, Bermuda
  • Average sea temperature in September: 27.8°C

The best months for swimming (with the highest average sea temperature) are August and September (27.8°C).
The coldest month (with the lowest average sea temperature) is March (19.2°C).

Average daylight in September /
Average sunshine in September
Hamilton, Bermuda

Average daylight in September / Average sunshine in September - Hamilton, Bermuda
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).

  • Average sunshine in September: 9h and 2min

The months with the most sunshine are July and August (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

Average sunshine days in September
Hamilton, Bermuda

Average sunshine days in September - Hamilton, Bermuda
  • Average sunshine days in September: 8 days

The month with the most sunshine days is May (16.6 days).
The month with the least sunshine days is August (7.3 days).

Average UV index in September
Hamilton, Bermuda

Average UV index in September - Hamilton, Bermuda
  • Average UV index in September: 7

The months with the highest UV index are June, July, August and September (UV index 7).
The months with the lowest UV index are January, February, March, April, November and December (UV index 5).

Average cloud cover in September
Hamilton, Bermuda

Average cloud cover in September - Hamilton, Bermuda
  • Average cloud cover in September: 34

The months with the most cloud cover are January and February (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in September
Hamilton, Bermuda

Average visibility in September - Hamilton, Bermuda
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

Hamilton, Bermuda

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