The climate of Osaka, a Japanese city in the southern part of Honshu Island, in the Kansai region, is
, with quite mild winters and hot, moist, and rainy summers. Like the rest of Japan, the city is affected by the
: in winter, the northwest cold currents will prevail, while in summer, they will be replaced by hot and humid currents of tropical origin.
The town is located on the coast, in the Seto Inland Sea, an area relatively protected both from the summer monsoon and from typhoons.
, there are fairly mild periods, with highs above 10 °C (50 °F), alternating with cold periods, with wind and rain, highs around 5/7 °C (41/45 °F) or less, and possible falls of sleet or snow. Snowfalls, however, are usually light, as are nocturnal frosts.
in Osaka are particularly hot and humid, also for the heat island effect which is typical of big cities. There can be periods of good weather, with maximum temperatures around 35 °C (95 °F) or above, tropical nights and high humidity, but also periods of bad weather due to the summer monsoon. August is the hottest month, both because of the thermal inertia of the sea and because of the lower frequency of periods of bad weather.
is quite abundant, in fact, it amounts to 1,300 millimeters (51 inches) per year. Winter is undoubtedly the driest season; the rainiest months are June and July, ie the first period of the rainy season (called
). In August, there is a certain decrease in rain frequency: on average, among the summer months, it is the hottest as well as the driest and sunniest.
is decent in winter, but it never becomes very good on average, however, there are two relative maxima, one in spring (April-May) and the other in August, after the Baiu rains, with 6.5/7 hours of sunshine per day.
near Osaka is warm enough for swimming, with a temperature of 23 °C (73 °F) or more, from July to October, and it becomes pleasantly warm in August.
From June to October (but especially from August to early October), Osaka may be affected by
, the tropical cyclones of Southeast Asia, though the area of the Seto Inland Sea is relatively sheltered (however, in September 1934, the city was hit by a typhoon that caused a lot of damage).
As regards to the climate, the best times to visit Osaka are spring and autumn, and in particular, from mid-April to mid-May and from late October to mid-November.
in Osaka reaches its peak around April the 3rd. About a week passes between the beginning and the peak of the flowering. The blooming date can vary by a few days, or even a week, earlier or later, depending on the year. Even though in some years it can get a little cold, with highs around 12 °C (54 °F), you can also take advantage of this period.
In summer, August is partly preferable to July, having more sunshine and less rainfall, but it is also true that it is hotter and there's a greater risk of typhoons.
. Here are the average temperatures.
January, the coldest month of the year, is generally a quite cold month. The average temperature is of
6.4 °C, with a minimum of
3 °C and a maximum of
9.7 °C.
On the coldest nights of the month, the temperature usually drops to around
-0.5 °C. However, it dropped to
-3.8 °C in January 1997.
On the warmest days of the month, the temperature usually reaches around
14.5 °C. However, it reached
19.1 °C in January 2020.
Precipitation amounts to
45 mm, distributed over 6 days.
The day lasts on average 10 hours and 5 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 61%.
The average wind speed is of
10 kph.
The average sea temperature is of
16.5 °C. Therefore, the sea is cold for swimming.
February is generally a quite mild month. The average temperature is of
6.8 °C, with a minimum of
3.2 °C and a maximum of
10.5 °C.
On the coldest nights of the month, the temperature usually drops to around
-0.5 °C. However, it dropped to
-2.9 °C in February 1999.
On the warmest days of the month, the temperature usually reaches around
17.5 °C. However, it reached
23.4 °C in February 2010.
Precipitation amounts to
60 mm, distributed over 7 days.
The day lasts on average 11 hours and 0 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 60%.
The average wind speed is of
10 kph.
The average sea temperature is of
15.5 °C. Therefore, the sea is cold for swimming.
March is generally a mild month. The average temperature is of
10.1 °C, with a minimum of
6 °C and a maximum of
14.2 °C.
On the coldest nights of the month, the temperature usually drops to around
1.5 °C. However, it dropped to
0.1 °C in March 2001.
On the warmest days of the month, the temperature usually reaches around
21.5 °C. However, it reached
24.2 °C in March 1999.
Precipitation amounts to
105 mm, distributed over 10 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 59%.
The average wind speed is of
10 kph.
The average sea temperature is of
15.5 °C. Therefore, the sea is cold for swimming.
April is generally a very mild month. The average temperature is of
15.4 °C, with a minimum of
10.9 °C and a maximum of
19.9 °C.
On the coldest nights of the month, the temperature usually drops to around
5 °C. However, it dropped to
2.6 °C in April 1996.
On the warmest days of the month, the temperature usually reaches around
26.5 °C. However, it reached
30.7 °C in April 2005.
Precipitation amounts to
100 mm, distributed over 10 days.
The day lasts on average 13 hours and 5 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 58%.
The average wind speed is of
10 kph.
The average sea temperature is of
16.8 °C. Therefore, the sea is cold for swimming.
May is generally a warm month. The average temperature is of
20.4 °C, with a minimum of
16 °C and a maximum of
24.9 °C.
On the coldest nights of the month, the temperature usually drops to around
11 °C. However, it dropped to
7.6 °C in May 1991.
On the warmest days of the month, the temperature usually reaches around
30 °C. However, it reached
32.7 °C in May 1998.
Precipitation amounts to
135 mm, distributed over 10 days.
The day lasts on average 14 hours and 0 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 61%.
The average wind speed is of
9 kph.
The average sea temperature is of
19.4 °C. Therefore, the sea is very cool for swimming.
June is generally a warm to hot month. The average temperature is of
24.2 °C, with a minimum of
20.3 °C and a maximum of
28 °C.
On the coldest nights of the month, the temperature usually drops to around
16 °C. However, it dropped to
14.3 °C in June 1993.
On the warmest days of the month, the temperature usually reaches around
32.5 °C. However, it reached
36.1 °C in June 2013.
Precipitation amounts to
185 mm, distributed over 12 days.
The day lasts on average 14 hours and 25 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 5 hours of sunshine per day. So, the sun shines 36% of the time.
The average humidity is 68%.
The average wind speed is of
9 kph.
The average sea temperature is of
22.5 °C. Therefore, the sea can be considered barely acceptable for swimming.
July is generally a very hot month. The average temperature is of
28.2 °C, with a minimum of
24.6 °C and a maximum of
31.8 °C.
On the coldest nights of the month, the temperature usually drops to around
20.5 °C. However, it dropped to
18.1 °C in July 1992.
On the warmest days of the month, the temperature usually reaches around
36 °C. However, it reached
38 °C in July 1994.
Precipitation amounts to
175 mm, distributed over 11 days.
The day lasts on average 14 hours and 10 minutes. So the days are long.
There are on average 6 hours of sunshine per day. So, the sun shines 42% of the time.
The average humidity is 70%.
The average wind speed is of
9 kph.
The average sea temperature is of
25.7 °C. Therefore, the sea is warm enough for swimming.
August, the hottest month of the year, is generally a very hot month. The average temperature is of
29.8 °C, with a minimum of
25.8 °C and a maximum of
33.7 °C.
On the coldest nights of the month, the temperature usually drops to around
22 °C. However, it dropped to
19.9 °C in August 2018.
On the warmest days of the month, the temperature usually reaches around
37 °C. However, it reached
39.1 °C in August 1994.
Precipitation amounts to
115 mm, distributed over 8 days.
The day lasts on average 13 hours and 25 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 53% of the time.
The average humidity is 66%.
The average wind speed is of
9 kph.
The average sea temperature is of
27.7 °C. Therefore, the sea is pleasantly warm and allows long swims.
September is generally a warm to hot month. The average temperature is of
25.7 °C, with a minimum of
21.9 °C and a maximum of
29.5 °C.
On the coldest nights of the month, the temperature usually drops to around
17 °C. However, it dropped to
13.6 °C in September 1992.
On the warmest days of the month, the temperature usually reaches around
34 °C. However, it reached
36.2 °C in September 2010.
Precipitation amounts to
155 mm, distributed over 11 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 43% of the time.
The average humidity is 67%.
The average wind speed is of
8 kph.
The average sea temperature is of
26.4 °C. Therefore, the sea is pleasantly warm and allows long swims.
October is generally a warm month. The average temperature is of
19.8 °C, with a minimum of
16 °C and a maximum of
23.7 °C.
On the coldest nights of the month, the temperature usually drops to around
10.5 °C. However, it dropped to
7.5 °C in October 1997.
On the warmest days of the month, the temperature usually reaches around
29.5 °C. However, it reached
33.1 °C in October 2019.
Precipitation amounts to
135 mm, distributed over 9 days.
The day lasts on average 11 hours and 20 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 65%.
The average wind speed is of
8 kph.
The average sea temperature is of
23.7 °C. Therefore, the sea can be considered barely acceptable for swimming.
November is generally a mild month. The average temperature is of
14 °C, with a minimum of
10.2 °C and a maximum of
17.8 °C.
On the coldest nights of the month, the temperature usually drops to around
5 °C. However, it dropped to
1.9 °C in November 2008.
On the warmest days of the month, the temperature usually reaches around
23.5 °C. However, it reached
26.6 °C in November 2020.
Precipitation amounts to
75 mm, distributed over 7 days.
The day lasts on average 10 hours and 20 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 64%.
The average wind speed is of
8 kph.
The average sea temperature is of
21.3 °C. Therefore, the sea is cool for swimming.
December is generally a mild month. The average temperature is of
8.8 °C, with a minimum of
5.3 °C and a maximum of
12.3 °C.
On the coldest nights of the month, the temperature usually drops to around
1 °C. However, it dropped to
-0.8 °C in December 2005.
On the warmest days of the month, the temperature usually reaches around
18 °C. However, it reached
24.5 °C in December 2018.
Precipitation amounts to
55 mm, distributed over 7 days.
The day lasts on average 9 hours and 55 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 62%.
The average wind speed is of
9 kph.
The average sea temperature is of
18.7 °C. Therefore, the sea is very cool for swimming.