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Contents
- The climate of Okayama
- The best time to visit Okayama
- The worst time to visit Okayama
- Spring weather in Okayama
- Summer weather in Okayama
- Autumn weather in Okayama
- Winter weather in Okayama
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average sea temperature
- Average daylight
- Average sunshine
- Average UV index
The climate of Okayama
Okayama, Japan follows a Humid subtropical climate, classified as Cfa according to the Köppen climate classification. Nestled in southeast Honshu, it has no distinguishable dry season. Across the entire year, the temperature ranges from 1.1°C (34°F), the lowest in January to 32.7°C (90.9°F) being the highest in August. The relative humidity remains mostly around 65 to 73%, fluctuating moderately throughout the year.
Observing the rainfall figures, from 31mm (1.22") in December to the peak of 172mm (6.77") in June, it is clear that Okayama experiences precipitation quite extensively amid the twelve months. This trend is complemented by the number of rainfall days ranging from 13 to 18 days per month. As for snowfall, it stays restricted to a fixed 10mm (0.39") during the first three months with its absence throughout the rest of the year.
The daylight hours are longest, approximately 14.5 hours during summer and shorten to approximately 9.9 hours in December. Correspondingly, the duration of sunshine also undergoes a change from 4.9 hours to 6.7. The UV index shows a significant variation with a monthly maximum of 11 in July, which then decreases to 2 in December.
Observing the rainfall figures, from 31mm (1.22") in December to the peak of 172mm (6.77") in June, it is clear that Okayama experiences precipitation quite extensively amid the twelve months. This trend is complemented by the number of rainfall days ranging from 13 to 18 days per month. As for snowfall, it stays restricted to a fixed 10mm (0.39") during the first three months with its absence throughout the rest of the year.
The daylight hours are longest, approximately 14.5 hours during summer and shorten to approximately 9.9 hours in December. Correspondingly, the duration of sunshine also undergoes a change from 4.9 hours to 6.7. The UV index shows a significant variation with a monthly maximum of 11 in July, which then decreases to 2 in December.
The best time to visit Okayama
The prime period to plan a visit to Okayama predominantly includes the months from April to June. During this time, the average temperatures variate between 13.3°C (55.9°F) to 27.7°C (81.9°F) providing favourable weather for outdoor activities. Moreover, humidity levels also remain at moderate levels, ensuring comfortable conditions for sightseeing and exploring the city attractions.
The worst time to visit Okayama
The months from July to September may not be considered the best time for a visit since temperatures tend to peak to over 28°C (82.4°F), which can make outdoor activities uncomfortable. These months also observe the highest rainfall with the highest precipitation of 172mm (6.77") falling in June, thus leading to a considerable number of rain days which can interrupt travel plans.
Spring weather in Okayama
The springtime in Okayama from March to May sees temperatures ranging from 4.3°C (39.7°F) to 24.4°C (75.9°F). The city witnesses an increase in the number of daylight hours from 12 hours in March to 14 hours in May. Similarly, the sunshine duration also enhances from 5.5 hours to 6.5 hours. Rainfall starts to rise going from 87mm (3.43") to 125mm (4.92"), leading to slightly longer periods of wet weather.
Summer weather in Okayama
Summertime that stretches from June to August exhibits highest temperatures from 27.7°C (81.9°F) to 32.7°C (90.9°F). The city observes its maximum daylight hours nearing 14.5 hours during the peak summer months. The rainfall level too reaches its maximum, with the precipitation quantity going up to 172mm (6.77") in June. The sustained summer heat, coupled with the consistently high humidity, results in relatively difficult outdoor conditions.
Autumn weather in Okayama
Autumn, during the period of September to November, witnesses a gradual decline in temperatures going from 28.4°C (83.1°F) to 16.8°C (62.2°F). The accumulated daylight hours present a decrease from 12.4 hours to 10.4 hours while rainfall levels surge to 134mm (5.28") in September. The weather remains relatively humid during this period, though not as high as the summer months.
Winter weather in Okayama
The winter season defined by the months of December to February is the coolest of all the seasons with temperatures shifting from 11.6°C (52.9°F) to 1.1°C (34°F). The number of daylight hours go as low as 9.9 hours in December whereas hours of sunshine range from 5.1 during December and February. Rainfall is minimal during this time with 31mm (1.22") being the lowest precipitation in December. Exactly 10mm (0.39") of snowfall is expected in each month of this season.
Weather in January
The oh-so-cool January days in Okayama, Japan mark the beginnings of a new year with temperatures chilling down to 1.1°C (34°F), making it the coldest month of the year. Snowfall, though relatively light with 10mm (0.39"), adds an element of white beauty to the landscape. Weather in January »
Weather in February
As Okayama transitions from January to February, a very slight moderation in climatic conditions can be noticed. This month too grapples with 10mm (0.39") of snowfall, though the days are a bit longer, sporting an average of 10.9 hours of daylight. Weather in February »
Weather in March
March denotes the end of the snowy season in Okayama and the welcoming of spring that brings a noticeable increase in temperatures up to 13.3°C (55.9°F). This month marks the onset of rainfall, escalating to an appreciable 87mm (3.43") thus aiding the booming of cherry blossoms. Weather in March »
Weather in April
April signifies the heart of spring in Okayama with temperatures taking a substantial leap up to 19.6°C (67.3°F). This period experiences the highest rainfall of the year, peaking at 92mm (3.62") which keeps the landscape fresh and vibrant. Weather in April »
Weather in May
In May, Okayama catapults itself into the summer season with mercury soaring to a scorching 24.4°C (75.9°F). The overall warmth brings more humidity with it, making the conditions quite sultry. Rainfall intensifies up to 125mm (4.92") watering the lush green foliage throughout the city. Weather in May »
Weather in June
The weather takes a turn in June with Okayama city experiencing hotter conditions, with temperatures accelerating to 27.7°C (81.9°F). Increased humidity turns the cityscape into a moist greenhouse supporting the thriving foliage. Weather in June »
Weather in July
July stands tall as the warmest month in Okayama with temperatures skyrocketing to a significant high of 31.4°C (88.5°F). Despite the heat, it also brings about the highest humidity of the year with a reading of 73%. The rainfall lessens in comparison to the previous month, falling to a total of 161mm (6.34") rain distributed over 17 days. Weather in July »
Weather in August
August, the peak summer month, ushers in the highest temperatures of the year in Okayama racing to 32.7°C (90.9°F). The humidity drops slightly from July to 69%, providing a minor relief from the otherwise sticky conditions. Rainfall exhibits a sharp decline to 87mm (3.43"), making it the driest month of the year. Weather in August »
Weather in September
September marks the descent from peak summer with a mild drop in temperature, reaching 28.4°C (83.1°F). There is a resurgence in rainfall, rising to 134mm (5.28") in preparation for the upcoming autumn season. The dropping temperatures and humidity mark a transition toward more comfortable surroundings. Weather in September »
Weather in October
October brings a drop in temperatures as Okayama makes a swift transition from summer to autumn with highs of 22.5°C (72.5°F). The rainfall lessens to 81mm (3.19"), creating the perfect balance between sunny and rainy days. The changing hues of leaves against the backdrop of clear blue skies become a visual treat for both residents and tourists. Weather in October »
Weather in November
In November, Okayama braces for the winter feel with temperatures dipping to 16.8°C (62.2°F), a clear decrease from the previous month. Rainfall experiences a further reduction to 51mm (2.01") over 14 days. The relatively dry weather, coupled with the colorful autumn foliage, provides an ideal setting for outdoor activities. Weather in November »
Weather in December
December brings in the cold wave in Okayama, seeing temperatures drop further to 11.6°C (52.9°F) from the preceding month. A sharp decrease in rainfall to 31mm (1.22") signals the onset of the city's winter season. The second shortest daylight hours of the year means more time to enjoy the illuminations of holiday lights against the nighttime sky. Weather in December »
[Resources]Frequently asked questions
What are the coldest months in Okayama?
January, marked by an average high-temperature of 9°C (48.2°F) and a low-temperature of 1.1°C (34°F), is the coldest month in Okayama.
How many days does it rain in Okayama?
In Okayama, during the entire year, the rain falls for 189 days and collects up to 1106mm (43.54") of precipitation.
When does it snow in Okayama?
January through March are months with snowfall in Okayama.
What is the snowiest month in Okayama?
The months with the most snowfall are January through March, with an average 10mm (0.39") of accumulated snow.
How much does it snow in Okayama?
In Okayama, Japan, during the entire year, snow aggregates up to 30mm (1.18").
What is the month with the least sunshine in Okayama?
The month with the least sunshine in Okayama, Japan, is January, with an average of 4.9h of sunshine.
What is the month with the coldest sea water in Okayama?
February is the month with the coldest seawater, with an average sea temperature of 13.3°C (55.9°F).
What is the least humid month in Okayama?
The least humid month is April, with an average relative humidity of 60%.
When it does not snow in Okayama?
April through December are months without snowfall.
What is the rainiest month in Okayama?
June is the month with the most rainfall. Rain falls for 17 days and accumulates 172mm (6.77") of precipitation.
When are the longest days in Okayama?
The month with the longest days in Okayama, Japan, is June, with an average of 14h and 24min of daylight.
What is the most humid month in Okayama?
The most humid month is July, with an average relative humidity of 73%.
What is the month with the highest UV index in Okayama?
The month with the highest UV index in Okayama, Japan, is July, with an average maximum UV index of 11.
What time of the year is the hottest in Okayama?
The warmest temperatures in Okayama occur during August, when averages reach a peak of 32.7°C (90.9°F) and a low of 24.7°C (76.5°F).
What month is the sea warmest in Okayama?
August is the month with the warmest seawater in Okayama, Japan, with an average sea temperature of 27.2°C (81°F).
What month has the most sunshine in Okayama?
The month with the most sunshine is August, with an average of 6.7h of sunshine.
What is the driest month in Okayama?
December is the month with the least rainfall in Okayama, Japan. Rain falls for 15 days and accumulates 31mm (1.22") of precipitation.
What is the month with the shortest days in Okayama?
With an average of 9h and 54min of daylight, December has the shortest days of the year in Okayama, Japan.
Is there Daylight Saving Time (DST) in Okayama?
Okayama does not utilize Daylight Saving Time (DST). JST timezone is used throughout the entire year.
What is the month with the lowest UV index in Okayama?
With an average maximum UV index of 2, December is the month with the lowest UV index in Okayama.
Average temperature
Okayama, Japan
The warmest month (with the highest average high temperature) is August (32.7°C).
The month with the lowest average high temperature is January (9°C).
The month with the highest average low temperature is August (24.7°C).
The coldest month (with the lowest average low temperature) is January (1.1°C).
Average humidity
Okayama, Japan
The month with the highest relative humidity is July (73%).
The month with the lowest relative humidity is April (60%).
Average rainfall
Okayama, Japan
- Average rainfall in January:
34.2mm - Average rainfall in February:
50.5mm - Average rainfall in March:
86.7mm - Average rainfall in April:
92.3mm - Average rainfall in May:
125mm - Average rainfall in June:
171.5mm
- Average rainfall in July:
160.9mm - Average rainfall in August:
87.4mm - Average rainfall in September:
134.4mm - Average rainfall in October:
81.1mm - Average rainfall in November:
51.2mm - Average rainfall in December:
31mm
The wettest month (with the highest rainfall) is June (171.5mm).
The driest month (with the least rainfall) is December (31mm).
Average rainfall days
Okayama, Japan
- Average rainfall days in January:
18 days - Average rainfall days in February:
17 days - Average rainfall days in March:
18 days - Average rainfall days in April:
15 days - Average rainfall days in May:
14 days - Average rainfall days in June:
17 days
- Average rainfall days in July:
17 days - Average rainfall days in August:
13 days - Average rainfall days in September:
17 days - Average rainfall days in October:
14 days - Average rainfall days in November:
14 days - Average rainfall days in December:
15 days
The months with the highest number of rainy days are January and March (18 days).
The month with the least rainy days is August (13 days).
Average snowfall
Okayama, Japan
The months with the highest snowfall are January, February and March (10mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).
Average sea temperature
Okayama, Japan
The best month for swimming (with the highest average sea temperature) is August (27.2°C).
The coldest month (with the lowest average sea temperature) is February (13.3°C).
Average daylight / Average sunshine
Okayama, Japan
- Average daylight in January:
10h and 1min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 0min - Average daylight in June:
14h and 2min
- Average daylight in July:
14h and 1min - Average daylight in August:
13h and 2min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 2min - Average daylight in December:
9h and 5min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January:
4h and 5min - Average sunshine in February:
5h and 1min - Average sunshine in March:
5h and 3min - Average sunshine in April:
6h and 2min - Average sunshine in May:
6h and 3min - Average sunshine in June:
5h and 2min
- Average sunshine in July:
5h and 3min - Average sunshine in August:
6h and 4min - Average sunshine in September:
5h and 1min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 1min - Average sunshine in December:
5h and 1min
The month with the most sunshine is August (Average sunshine: 6h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average UV index
Okayama, Japan
The month with the highest UV index is July (UV index 11).
The month with the lowest UV index is December (UV index 2).
Okayama, Japan
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