September weather forecastIchihara, Japan

September

Weather in September

The first month of the autumn, September, is still a warm month in Ichihara, Japan, with temperature in the range of an average low of 21.8°C (71.2°F) and an average high of 26.4°C (79.5°F).

Temperature

As September arrives, Ichihara's weather displays a minor decrease in high-temperatures, transitioning from August's 29.8°C (85.6°F) to a still moderately hot 26.4°C (79.5°F). Ichihara's September nights exhibit a subtle drop in temperature, averaging at an agreeable 21.8°C (71.2°F), closely aligned with the daytime highs.

Humidity

In Ichihara, the average relative humidity in September is 77%.

Rainfall

In Ichihara, in September, during 16.3 rainfall days, 117mm (4.61") of precipitation is typically accumulated. Throughout the year, there are 162.9 rainfall days, and 921mm (36.26") of precipitation is accumulated.

Snowfall

In Ichihara, snow does not fall in March through December.

Sea temperature

In Ichihara, the average seawater temperature in September is 24.9°C (76.8°F).
Note: Individual cold sensitivities, influenced by sunshine, wind, and the ambient temperature, play a role in finding a swim in 24.9°C (76.8°F) water pleasant. (Olympic swimming events mandate water temperatures from 25°C (77°F) to 28°C (82.4°F).)

Daylight

In Ichihara, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 05:11 and sunset at 18:07. On the last day of September, sunrise is at 05:33 and sunset at 17:25 JST.

Sunshine

The average sunshine in September in Ichihara is 7.6h.

UV index

In September, the average daily maximum UV index is 6. 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 6 in September translates into these instructions:
Resist overexposure. Safeguarding from solar damage is indispensable. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

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

Frequently asked questions

The high-temperature, in September, in Ichihara, is 26.4°C (79.5°F), while the low-temperature averages to 21.8°C (71.2°F). In August, the average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, is appraised at 37°C (98.6°F).

The average relative humidity in September is 77%.

In Ichihara, during September, the rain falls for 16.3 days and regularly aggregates up to 117mm (4.61") of precipitation.

In Ichihara, Japan, snow does not fall in March through December.

In Ichihara, in September, the average water temperature is 24.9°C (76.8°F). For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 24.9°C (76.8°F).

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

In September, on the first day of the month, sunrise is at 05:11 and sunset at 18:07. On the last day of the month, sunrise is at 05:33 and sunset at 17:25 JST.

In September, the average sunshine duration in Ichihara is 7.6h.

In Ichihara, Japan, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to the Sun's 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

29.8°C

26.4°C

21.5°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

15.1km/h

14.7km/h

16.5km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

16.3

15.9

Average snowfall

0mm

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

13.8

10.9

12.7

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Ichihara, Japan

Average high temperature in September: 26.4°C

The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (9.3°C).

Average low temperature in September: 21.8°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 (3.8°C).

Average pressure in September
Ichihara, Japan

Average pressure in September: 1013.4mbar

The month with the highest atmospheric pressure is November (1017.9mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).

Average wind speed in September
Ichihara, Japan

Average wind speed in September: 14km/h

The windiest month (with the highest average wind speed) is March (17.4km/h).
The calmest month (with the lowest average wind speed) is June (13.4km/h).

Average humidity in September
Ichihara, Japan

Average humidity in September: 77%

The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is January (62%).

Average rainfall in September
Ichihara, Japan

Average rainfall in September: 117mm

The wettest month (with the highest rainfall) is October (124mm).
The driest month (with the least rainfall) is January (41mm).

Average rainfall days in September
Ichihara, Japan

Average rainfall days in September: 16.3 days

The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is January (7.2 days).

Average snowfall in September
Ichihara, Japan

Average snowfall in September: 0mm

The month with the highest snowfall is February (26mm).
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).

Average snowfall days in September
Ichihara, Japan

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

Average sea temperature in September
Ichihara, Japan

Average sea temperature in September: 24.9°C

The best month for swimming (with the highest average sea temperature) is August (25.3°C).
The coldest month (with the lowest average sea temperature) is February (14.4°C).

Average daylight in September /
Average sunshine in September
Ichihara, 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: 7h and 36min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 5h and 18min).

Average sunshine days in September
Ichihara, Japan

Average sunshine days in September: 10.9 days

The month with the most sunshine days is January (22.8 days).
The month with the least sunshine days is June (10.3 days).

Average UV index in September
Ichihara, 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, March, November and December (UV index 3).

Average cloud cover in September
Ichihara, Japan

Average cloud cover in September: 41

The month with the most cloud cover is June (Cloud cover 47).
The month with the least cloud cover is January (Cloud cover 32).

Average visibility in September
Ichihara, Japan

Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).