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 snowfall in September
- Average snowfall days in September
- Average sea temperature 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 commencement of September indicates a gentle shift in the average high-temperature, receding from August's 27.8°C (82°F) to a still moderately hot 23.9°C (75°F). During September, Sendai records a consistent average nighttime temperature of 17.5°C (63.5°F).Humidity
The average relative humidity in September in Sendai is 80%.Rainfall
In Sendai, in September, it is raining for 12.9 days, with typically 66mm (2.6") of accumulated precipitation. Throughout the year, in Sendai, there are 152.2 rainfall days, and 720mm (28.35") of precipitation is accumulated.Snowfall
May through November are months without snowfall.Sea temperature
In September, the average sea temperature in Sendai is 22.7°C (72.9°F).Note: When thinking about a swim in 22.7°C (72.9°F) waters, consider your cold tolerance, the day's sunshine, wind, and air temperature. It is a fun fact that Olympic swimmers dive into waters of 25°C (77°F) to 28°C (82.4°F).
Daylight
The average length of the day in September is 12h and 27min.On the first day of September in Sendai, sunrise is at 05:06 and sunset at 18:06. On the last day of the month, sunrise is at 05:31 and sunset at 17:21 JST.
Sunshine
In Sendai, the average sunshine in September is 7.7h.UV index
In September, the average daily maximum UV index in Sendai is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Take precautions - Protection against sunburn is recommended. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Caution! The Sun's UV rays become stronger due to reflections from water and sand.
Frequently asked questions
What is the usual temperature for Sendai in September?
What is the average humidity in September in Sendai?
How many days does it rain in September in Sendai?
When it does not snow in Sendai?
How warm is the water in September in Sendai?
What is the average length of the day in September in Sendai?
When is the sunrise / sunset in September in Sendai?
How many hours of sunshine does Sendai have in September?
What is the UV index reading in September in Sendai?
Average temperature in September
Sendai, Japan
- Average high temperature in September: 23.9°C
The warmest month (with the highest average high temperature) is August (27.8°C).
The month with the lowest average high temperature is January (3.3°C).
- Average low temperature in September: 17.5°C
The month with the highest average low temperature is August (21.4°C).
The coldest months (with the lowest average low temperature) are January and February (-1.7°C).
Average pressure in September
Sendai, Japan
- Average pressure in September: 1014mbar
The month with the highest atmospheric pressure is November (1018.7mbar).
The month with the lowest atmospheric pressure is June (1009.3mbar).
Average wind speed in September
Sendai, Japan
- Average wind speed in September: 9.7km/h
The windiest month (with the highest average wind speed) is January (14.4km/h).
The calmest month (with the lowest average wind speed) is July (8.1km/h).
Average humidity in September
Sendai, Japan
- Average humidity in September: 80%
The month with the highest relative humidity is July (84%).
The months with the lowest relative humidity are April and May (72%).
Average rainfall in September
Sendai, Japan
- Average rainfall in September: 66mm
The wettest months (with the highest rainfall) are July and October (111mm).
The driest month (with the least rainfall) is February (22mm).
Average rainfall days in September
Sendai, Japan
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is July (20.7 days).
The month with the least rainy days is January (8.7 days).
Average snowfall in September
Sendai, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (63mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Sendai, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (9.2 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Sendai, Japan
- Average sea temperature in September: 22.7°C
The best month for swimming (with the highest average sea temperature) is August (23.9°C).
The coldest month (with the lowest average sea temperature) is March (7.5°C).
Average daylight in September /
Average sunshine in September
Sendai, Japan
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is May (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in September
Sendai, Japan
- Average sunshine days in September: 14.1 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is July (7.2 days).
Average UV index in September
Sendai, Japan
- Average UV index in September: 5
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Sendai, Japan
- Average cloud cover in September: 40
The month with the most cloud cover is July (Cloud cover 49).
The month with the least cloud cover is May (Cloud cover 36).
Average visibility in September
Sendai, Japan
- Average visibility in September: 9km
The months with the highest visibility are October, November and December (10km).
The month with the lowest visibility is July (8km).
Sendai, Japan
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