September weather forecastHayama, Japan

September

Weather in September

The first month of the autumn, September, is still a warm month in Hayama, Japan, with an average temperature varying between 26°C (78.8°F) and 22.3°C (72.1°F).

Temperature

September's advent denotes a minor fluctuation in the average high-temperature to a still moderately hot 26°C (78.8°F) from August's 28.8°C (83.8°F). Hayama observes a minimal variance in temperature, with a consistent average low of 22.3°C (72.1°F) during the nights of September.

Humidity

The average relative humidity in September in Hayama is 77%.

Rainfall

In Hayama, in September, it is raining for 15.2 days, with typically 106mm (4.17") of accumulated precipitation. In Hayama, during the entire year, the rain falls for 150.9 days and collects up to 867mm (34.13") of precipitation.

Snowfall

April through December are months without snowfall in Hayama.

Sea temperature

In Hayama, the average seawater temperature in September is 25.9°C (78.6°F).
Note: Temperatures between 25°C (77°F) and 29°C (84.2°F) in water are ideal for swimming, diving, and other activities, providing enjoyment and comfort for extended durations.

Daylight

In Hayama, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 05:14 and sunset at 18:09. On the last day of September, sunrise is at 05:35 and sunset at 17:27 JST.

Sunshine

In September, the average sunshine in Hayama, Japan, is 8.2h.

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.
Note: A maximum high daily UV index of 6 during September translates into the following directions:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Take caution! The UV rays from the Sun gain strength from sand and water reflections.

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature, in September, in Hayama, records 26°C (78.8°F), while the low-temperature is 22.3°C (72.1°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is appraised at 34°C (93.2°F).

The average relative humidity in September in Hayama, Japan, is 77%.

In Hayama, in September, during 15.2 rainfall days, 106mm (4.17") of precipitation is typically accumulated.

In Hayama, Japan, snow does not fall in April through December.

In September, the average sea temperature in Hayama, Japan, is 25.9°C (78.6°F). 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.

In September, the average day length in Hayama is 12h and 25min.

On the first day of September in Hayama, sunrise is at 05:14 and sunset at 18:09. On the last day of the month, sunrise is at 05:35 and sunset at 17:27 JST.

In September, the average sunshine duration in Hayama, Japan, is 8.2h.

In Hayama, Japan, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

28.8°C

26°C

21.7°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

18km/h

17.8km/h

20.7km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

11.6

12.8

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Hayama, Japan

Average high temperature in September: 26°C

The warmest month (with the highest average high temperature) is August (28.8°C).
The month with the lowest average high temperature is January (9.8°C).

Average low temperature in September: 22.3°C

The month with the highest average low temperature is August (25.3°C).
The coldest month (with the lowest average low temperature) is January (5.3°C).

Average pressure in September
Hayama, Japan

Average pressure in September: 1013.2mbar

The month with the highest atmospheric pressure is November (1017.9mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).

Average wind speed in September
Hayama, Japan

Average wind speed in September: 16.8km/h

The windiest month (with the highest average wind speed) is March (20.8km/h).
The calmest month (with the lowest average wind speed) is June (15.9km/h).

Average humidity in September
Hayama, Japan

Average humidity in September: 77%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is January (61%).

Average rainfall in September
Hayama, Japan

Average rainfall in September: 106mm

The wettest month (with the highest rainfall) is October (119mm).
The driest months (with the least rainfall) are February and December (39mm).

Average rainfall days in September
Hayama, Japan

Average rainfall days in September: 15.2 days

The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is January (6.5 days).

Average snowfall in September
Hayama, Japan

Average snowfall in September: 0mm

The month with the highest snowfall is February (10mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).

Average snowfall days in September
Hayama, Japan

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.5 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).

Average sea temperature in September
Hayama, Japan

Average sea temperature in September: 25.9°C

The best month for swimming (with the highest average sea temperature) is August (26.2°C).
The coldest months (with the lowest average sea temperature) are February and March (16.2°C).

Average daylight in September /
Average sunshine in September
Hayama, Japan

Average daylight in September: 12h and 24min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

Average sunshine in September: 8h and 12min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).

Average sunshine days in September
Hayama, Japan

Average sunshine days in September: 11.6 days

The month with the most sunshine days is January (23.2 days).
The month with the least sunshine days is June (11.4 days).

Average UV index in September
Hayama, Japan

Average UV index in September: 6

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).

Average cloud cover in September
Hayama, Japan

Average cloud cover in September: 36

The months with the most cloud cover are March, June and October (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in September
Hayama, Japan

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).