Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The transition into September reveals an average high-temperature of a still moderately hot 28.7°C (83.7°F), mirroring a close resemblance to August. Umusa sees a gentle drop from the daily peak temperature in September, with an average low settling at a still warm 26.8°C (80.2°F).Heat index
Throughout September, the heat index is evaluated at a tropical 34°C (93.2°F). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.Data suggests that the heat index is set for environments in shade and with a light wind. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Humidity
The average relative humidity in September is 79%.Rainfall
In Umusa, in September, it is raining for 20.8 days, with typically 155mm (6.1") of accumulated precipitation. Throughout the year, in Umusa, Japan, there are 229.8 rainfall days, and 1512mm (59.53") of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 19min.On the first day of September in Umusa, sunrise is at 06:07 and sunset at 18:48. On the last day of the month, sunrise is at 06:20 and sunset at 18:15 JST.
Sunshine
The average sunshine in September in Umusa is 8.1h.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the average person.Note: An average UV index of 7 in September transforms into this advice:
Fend off overexposure. Sun protection is vital. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in Umusa in September?
What is the average humidity in September in Umusa?
How much does it rain in Umusa in September?
What is the average length of the day in September in Umusa?
When are sunrise and sunset in September in Umusa?
How many hours of sunshine does Umusa have in September?
When is the highest UV index in Umusa?
What is the UV index reading in September in Umusa?
Average temperature in September
Umusa, Japan
- Average high temperature in September: 28.7°C
The warmest month (with the highest average high temperature) is August (29.4°C).
The month with the lowest average high temperature is January (18.6°C).
- Average low temperature in September: 26.8°C
The month with the highest average low temperature is August (27.8°C).
The coldest month (with the lowest average low temperature) is January (16.3°C).
Average pressure in September
Umusa, Japan
- Average pressure in September: 1009.1mbar
The month with the highest atmospheric pressure is January (1021mbar).
The month with the lowest atmospheric pressure is August (1006.7mbar).
Average wind speed in September
Umusa, Japan
- Average wind speed in September: 20.9km/h
The windiest month (with the highest average wind speed) is December (25.7km/h).
The calmest month (with the lowest average wind speed) is May (18.4km/h).
Average humidity in September
Umusa, Japan
- Average humidity in September: 79%
The month with the highest relative humidity is June (87%).
The month with the lowest relative humidity is January (72%).
Average rainfall in September
Umusa, Japan
- Average rainfall in September: 155mm
The wettest month (with the highest rainfall) is June (228mm).
The driest month (with the least rainfall) is January (63mm).
Average rainfall days in September
Umusa, Japan
- Average rainfall days in September: 20.8 days
The month with the highest number of rainy days is June (22.6 days).
The month with the least rainy days is November (16.2 days).
Average daylight in September /
Average sunshine in September
Umusa, Japan
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Umusa, Japan
- Average sunshine days in September: 5.9 days
The month with the most sunshine days is May (11.1 days).
The month with the least sunshine days is June (5.4 days).
Average UV index in September
Umusa, Japan
- 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 and December (UV index 4).
Average cloud cover in September
Umusa, Japan
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in September
Umusa, Japan
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is May (9km).
Umusa, Japan
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