September weather forecastOasa, Japan

September

Weather in September

The first month of the autumn, September, is still a warm month in Oasa, Japan, with an average temperature ranging between min 17°C (62.6°F) and max 25.1°C (77.2°F).

Temperature

September sees a slight reduction in average high-temperature, with a shift from 29.8°C (85.6°F) in August to a still moderately hot 25.1°C (77.2°F). During the month of September, an average low-temperature of 17°C (62.6°F) is recorded in Oasa.

Humidity

The average relative humidity in September is 83%.

Rainfall

In September, in Oasa, the rain falls for 16.1 days. Throughout September, 114mm (4.49") of precipitation is accumulated. Throughout the year, in Oasa, there are 183.2 rainfall days, and 1092mm (42.99") of precipitation is accumulated.

Snowfall

April through October are months without snowfall in Oasa.

Daylight

In Oasa, the average length of the day in September is 12h and 24min.
On the first day of September, sunrise is at 05:43 and sunset at 18:37. On the last day of the month, sunrise is at 06:04 and sunset at 17:55 JST.

Sunshine

In September, the average sunshine is 8.1h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 4 during September translates into these guidelines:
Heed the precautions - Suggestions to avoid sunburn are made. Around midday, solar radiation is most harmful; hence, exposure should be limited. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.

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

Frequently asked questions

September temperatures vary between a high-temperature of 25.1°C (77.2°F) and a low-temperature of 17°C (62.6°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in August is computed to be 38°C (100.4°F).

The average relative humidity in September is 83%.

In Oasa, Japan, in September, it is raining for 16.1 days, with typically 114mm (4.49") of accumulated precipitation.

April through October are months without snowfall.

In Oasa, Japan, the average day length in September is 12h and 24min.

In September, on the first day of the month, sunrise is at 05:43 and sunset at 18:37. On the last day of the month, in Oasa, Japan, sunrise is at 06:04 and sunset at 17:55 JST.

The average sunshine duration in September is 8.1h.

The average daily maximum UV index in September in Oasa, Japan, is 4. A UV Index of 3 to 5 symbolizes a medium health risk 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

29.8°C

25.1°C

19.6°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.8km/h

7.5km/h

8.8km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

11.2

11.7

14.6

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Oasa, Japan

Average high temperature in September: 25.1°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 (5.1°C).

Average low temperature in September: 17°C

The month with the highest average low temperature is August (20.8°C).
The coldest month (with the lowest average low temperature) is January (-0.1°C).

Average pressure in September
Oasa, Japan

Average pressure in September: 1012.7mbar

The month with the highest atmospheric pressure is January (1020.9mbar).
The months with the lowest atmospheric pressure are June and July (1008.3mbar).

Average wind speed in September
Oasa, Japan

Average wind speed in September: 7km/h

The windiest month (with the highest average wind speed) is December (10.6km/h).
The calmest month (with the lowest average wind speed) is June (6.3km/h).

Average humidity in September
Oasa, Japan

Average humidity in September: 83%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is May (73%).

Average rainfall in September
Oasa, Japan

Average rainfall in September: 114mm

The wettest month (with the highest rainfall) is July (202mm).
The driest month (with the least rainfall) is November (42mm).

Average rainfall days in September
Oasa, Japan

Average rainfall days in September: 16.1 days

The month with the highest number of rainy days is July (21 days).
The month with the least rainy days is May (11.6 days).

Average snowfall in September
Oasa, Japan

Average snowfall in September: 0mm

The month with the highest snowfall is January (145mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in September
Oasa, Japan

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Oasa, 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 54min).

Average sunshine in September: 8h and 6min

The month with the most sunshine is August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).