September weather forecastShimabara, Japan
September
Weather in September
September, the first month of the autumn in Shimabara, is still a warm month, with temperature in the range of an average low of 21.7°C (71.1°F) and an average high of 27.4°C (81.3°F).Temperature
During September, Shimabara records an average high-temperature of a warm 27.4°C (81.3°F), marking a slight divergence from August's 30.3°C (86.5°F). Throughout the month of September, Shimabara witnesses an average low-temperature of 21.7°C (71.1°F).Heat index
September's mean heat index is computed to be a tropical 30°C (86°F). If one continues to be active during enduring exposure, it could result in fatigue and heat cramps.It is worth noting that heat index values are gauged for conditions in the shade and light breezes. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', gives a temperature feeling by integrating air temperature and humidity. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Humidity
In Shimabara, the average relative humidity in September is 76%.Rainfall
In Shimabara, during September, the rain falls for 14.7 days and regularly aggregates up to 59mm (2.32") of precipitation. Throughout the year, there are 163.3 rainfall days, and 865mm (34.06") of precipitation is accumulated.Snowfall
March through November are months without snowfall in Shimabara, Japan.Sea temperature
In September, the average sea temperature is 26.8°C (80.2°F).Note: For any water activity, surface water temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed perfect and extremely pleasing for enduring enjoyment.
Daylight
In Shimabara, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 05:53 and sunset at 18:43. On the last day of September, sunrise is at 06:12 and sunset at 18:04 JST.
Sunshine
The average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September in Shimabara is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In September, a daily maximum UV index of 6 leads to the following instructions:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Watch out! Reflections from sand and water can surge UV radiation exposure.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Shimabara, Japan
- Average high temperature in September: 27.4°C
The warmest month (with the highest average high temperature) is August (30.3°C).
The month with the lowest average high temperature is January (9.6°C).
- Average low temperature in September: 21.7°C
The month with the highest average low temperature is August (24.8°C).
The coldest month (with the lowest average low temperature) is January (4.6°C).
Average pressure in September
Shimabara, Japan
- Average pressure in September: 1011.8mbar
The month with the highest atmospheric pressure is January (1021.9mbar).
The month with the lowest atmospheric pressure is June (1008.1mbar).
Average wind speed in September
Shimabara, Japan
- Average wind speed in September: 10.1km/h
The windiest months (with the highest average wind speed) are February, March and December (12.5km/h).
The calmest month (with the lowest average wind speed) is June (8.9km/h).
Average humidity in September
Shimabara, Japan
- Average humidity in September: 76%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is March (70%).
Average rainfall in September
Shimabara, Japan
- Average rainfall in September: 59mm
The wettest month (with the highest rainfall) is July (183mm).
The driest month (with the least rainfall) is January (28mm).
Average rainfall days in September
Shimabara, Japan
- Average rainfall days in September: 14.7 days
The month with the highest number of rainy days is July (19.5 days).
The month with the least rainy days is October (9.8 days).
Average snowfall in September
Shimabara, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is January (6mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Shimabara, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.9 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Shimabara, Japan
- Average sea temperature in September: 26.8°C
The best month for swimming (with the highest average sea temperature) is August (27.8°C).
The coldest month (with the lowest average sea temperature) is March (15.5°C).
Average daylight in September /
Average sunshine in September
Shimabara, Japan
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 8h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in September
Shimabara, Japan
- Average sunshine days in September: 13.4 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in September
Shimabara, Japan
- Average UV index in September: 6
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Shimabara, Japan
- Average cloud cover in September: 34
The month with the most cloud cover is June (Cloud cover 48).
The months with the least cloud cover are August and October (Cloud cover 30).
Average visibility in September
Shimabara, Japan
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, August, September, October, November and December (10km).
The months with the lowest visibility are May, June and July (9km).
