Climate and monthly weather forecast
Sendai, Japan

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The climate of Sendai

Located on the northeastern coast of Japan's largest island, Honshu, Sendai experiences a Cfa Koppen climate classification, or Humid subtropical climate that sees no dry season. This coastal city's geography combined with the Pacific Ocean’s influence results in seasonal variations of weather conditions throughout the year.

A study of the temperature data reveals distinct seasons evidenced by the fluctuation in maximum and minimum temperatures. The warmest months are July and August, with peak average temperatures of 27.8°C (82°F) and 26.3°C (79.3°F) respectively, accompanied by the highest average minimum temperatures, reaching upward of 21.4°C (70.5°F) and 19.8°C (67.6°F). Contrasting this, the coldest months—January and February—see maximum temperatures of 3.3°C (37.9°F) and 4.1°C (39.4°F) respectively, with minimum averages falling below freezing to -1.7°C (28.9°F).

Humidity remains relatively constant throughout the year, but a subtle increase is seen in the summer months from June to August, reaching a peak of 84% relative humidity in July. On the other hand, snowfall is observed from December to March, peaking in January and February with accumulations of 62mm (2.44") and 63mm (2.48") respectively.

When it comes to precipitation, Sendai does not have a dry season. The overall wettest months are July and October, both experiences approximately 111mm (4.37") of rainfall. The city demonstrates consistent daylight hours varying from 9.6 hours in December to 14.8 hours in June.

The best time to visit Sendai

Taking into account the temperature, humidity, and rainfall, the best time to visit Sendai would be from late spring to early summer, specifically from May to June, when weather conditions are optimal. During this period, temperatures hover between 13.6°C (56.5°F) to 22.7°C (72.9°F) and humidity is reasonable at 72% to 80%. Mornings can begin with an appreciable dew, and evenings invite a calming air. Daylight hours are generous at more than 14 hours, offering ample time to enjoy outdoor activities, explore local attractions or just admire the blooming cherry blossoms.

The worst time to visit Sendai

Visitors may find January and February least favorable for a trip due to frigid conditions. During these months, average high temperatures barely rise above freezing and snow is commonplace with up to 63mm (2.48") falling in a month. In addition, these months witness fewer daylight hours, falling as low as 9.9 hours.

Spring weather in Sendai

Spring in Sendai, from March to May, reveals rising temperatures from 8.3°C (46.9°F) to 19.8°C (67.6°F) that bring a sense of renewal with blooming flowers and trees. Although rainfall begins to increase reaching 71mm (2.8") in April there are fewer rainy days, ensuring that precipitation is not a continuous disruption. At the same time, sunshine hours increase to a generous nine hours per day in May.

Summer weather in Sendai

Summer, from June to August, is the warmest period with maximum temperatures ranging from 22.7°C (72.9°F) to 27.8°C (82°F). With sea temperatures also reaching favorable conditions (from 17.8°C (64°F) to 23.9°C (75°F)), activities such as beach outings and sea bathing are popular. Although this period has the highest rainfall, it maintains less rainy days, diffusing the precipitation over an extended period without large disturbances.

Autumn weather in Sendai

From September to November, the autumn season offers mild temperatures ranging from 23.9°C (75°F) to 12.5°C (54.5°F), with a pleasant decrease in rainfall after a potentially wet summer. While October may record higher rainfall levels, it is spread over fewer days, providing periods of cooler weather and less humidity which are perfect for walks and sightseeing in comfort.

Winter weather in Sendai

Winter months, from December to February, bring a drastic change in weather conditions with chilly temperatures dipping to a low of -1.7°C (28.9°F). Snowfall is a common phenomenon with highest accumulations seen in January and February. Despite the cold and lesser daylight hours clocking in around 10 hours, winter offers the unique experience of snow-dusted landscapes and winter-specific festivities.

Weather in January

The year commences with chilly and relatively dry conditions in Sendai, Japan, quite different from what will ensue in the months to come. Rare is a day without some incipient signs of snow, a characteristic that adds a unique touch to January in Sendai. Weather in January »

Weather in February

February sees a continuation of the cold, brisk pattern marked by a noticeably cold wind. As the month progresses, there is a slight respite from the January chill as daytime temperatures increase, albeit marginally. Sunshine hours extend, bestowing the landscape with a somewhat cheerier disposition. Weather in February »

Weather in March

Weather in March reflects a season in flux as winter slowly hands over the reigns to spring. This transition brings with it a palpable shift in various conditions such as humidity, daylight hours, and temperature. In contrast to February, rain becomes more prevalent with rainfall reaching 48mm (1.89"). Weather in March »

Weather in April

By April, spring is in full bloom in Sendai and the weather substantially diverges from that of the preceding winter months. The transformation witnessed in the city's landscape is spectacular, mirroring the profound alterations in temperature. Weather in April »

Weather in May

Throughout May, the climate in Sendai is defined by steadily rising temperatures. Consequently, the sea temperature acclimatizes, complementing the warm weather on land. The city embraces the warmth, shifting from the blossoms of spring to the verdant growth of early summer. Weather in May »

Weather in June

Against the backdrop of an average temperature, ranging from 15.1°C (59.2°F) to a comfortable 22.7°C (72.9°F), June in Sendai represents the arrival of summer. The increase in temperature is complemented by a substantial increase in humidity and rainfall. Weather in June »

Weather in July

In July, the weather in Sendai is distinctly hot and humid, with 84% average relative humidity. The sunlit days stretch even longer, inviting locals and visitors to partake in a plethora of outdoor activities. This combination of heat and humidity results in sporadic periods of heavy rainfall, making an umbrella an essential accessory. Weather in July »

Weather in August

August is a stark contrast from its immediate predecessor in terms of rainfall in Sendai. Despite the reduction in rainfall, the city does not lose its humid, sweltering characteristics. There is an apparent dip in sunshine hours; however, daylight hours remain generously long. Weather in August »

Weather in September

September in Sendai offers an invite to the autumn season with nature's vibrant displays coloring the cityscape. As September progresses, temperatures become more weather-friendly, encouraging more outdoor adventures. However, the temperate climate does not signify the cessation of rainfall. Weather in September »

Weather in October

October marks a consistent reduction in Sendai's temperature as autumn permeates the city. The decrease in temperature is accompanied by an increase in the frequency of rainfall events. Majestic autumn foliage becomes the highlight of this month, providing picture-perfect frames across Sendai. Weather in October »

Weather in November

By November, the cooling trend in Sendai's climate continues unabated. The mercury variations, from 6.8°C (44.2°F) to 12.5°C (54.5°F), adequately describe the city's tryst with cold, yet not freezing temperatures during this month. Weather in November »

Weather in December

December proffers a chilly embrace as Sendai is ushered into the winter season. With temperatures plunging from 1.5°C (34.7°F) to 6.4°C (43.5°F), it provides a stark contrast to the warmer months. Snowfall returns to further imprint the December landscape with a wintery touch with an average of 22mm (0.87"). Weather in December »
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Frequently asked questions

What month is the coldest in Sendai?

January, on average, is the coldest month in Sendai, registering a high temperature of 3.3°C (37.9°F) and a low of -1.7°C (28.9°F).

How much does it rain in Sendai?

In Sendai, during the entire year, the rain falls for 152.2 days and collects up to 720mm (28.35") of precipitation.

When does it snow in Sendai?

Months with snowfall in Sendai are January through April and December.

How many days does it snow in Sendai?

Throughout the year, in Sendai, Japan, there are 27.1 snowfall days, and 195mm (7.68") of snow is accumulated.

What is the month with the least sunshine in Sendai?

January has the least sunshine of the year in Sendai, Japan, with an average of 5.1h of sunshine.

What is the month with the lowest UV index in Sendai?

The months with the lowest UV index in Sendai are January through March, November and December, with an average maximum UV index of 2.

What is the driest month in Sendai?

February is the month with the least rainfall. Rain falls for 8.8 days and accumulates 22mm (0.87") of precipitation.

What is the snowiest month in Sendai?

The month with the most snowfall is February, when snow falls for 9.2 days and typically aggregates up to 63mm (2.48") of snow.

What month is the sea coldest in Sendai?

The month with the coldest seawater is March, with an average sea temperature of 7.5°C (45.5°F).

What is the least humid month in Sendai?

The months with the lowest humidity in Sendai are April and May, with an average relative humidity of 72%.

When it does not snow in Sendai?

May through November are months without snowfall.

What month has the most sunshine in Sendai?

May has the most sunshine of the year, with an average of 9.5h of sunshine.

When are the longest days in Sendai?

The month with the longest days in Sendai is June, with an average of 14h and 48min of daylight.

What is the most humid month in Sendai?

With an average relative humidity of 84%, July is the most humid month in Sendai, Japan.

What is the wettest month in Sendai?

The wettest months in Sendai, Japan, are July and October, with an average 111mm (4.37") of rainfall.

What are the months with the highest UV index in Sendai?

The months with the highest UV index are July and August, with an average maximum UV index of 6.

What is the warmest month in Sendai?

The warmest time of the year in Sendai is August, with temperatures averaging a high of 27.8°C (82°F) and a low of 21.4°C (70.5°F).

When is the sea warmest in Sendai?

With an average sea temperature of 23.9°C (75°F), August is the month with the warmest seawater in Sendai.

What is the month with the shortest days in Sendai?

The month with the shortest days in Sendai, Japan, is December, with an average of 9h and 36min of daylight.

Is there Daylight Saving Time (DST) in Sendai?

Sendai, Japan, does not observe Daylight Saving Time (DST). JST timezone is used over the entire year.

Average temperature
Sendai, Japan

Average temperature - Sendai, Japan

The warmest month (with the highest average high temperature) is August (27.8°C).
The month with the lowest average high temperature is January (3.3°C).

The month with the highest average low temperature is August (21.4°C).
The coldest months (with the lowest average low temperature) are January and February (-1.7°C).

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Average pressure
Sendai, Japan

Average pressure - Sendai, Japan

The month with the highest atmospheric pressure is November (1018.7mbar).
The month with the lowest atmospheric pressure is June (1009.3mbar).

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Average wind speed
Sendai, Japan

Average wind speed - Sendai, Japan

The windiest month (with the highest average wind speed) is January (14.4km/h).
The calmest month (with the lowest average wind speed) is July (8.1km/h).

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Average humidity
Sendai, Japan

Average humidity - Sendai, Japan

The month with the highest relative humidity is July (84%).
The months with the lowest relative humidity are April and May (72%).

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Average rainfall
Sendai, Japan

Average rainfall - Sendai, Japan

The wettest months (with the highest rainfall) are July and October (111mm).
The driest month (with the least rainfall) is February (22mm).

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Average rainfall days
Sendai, Japan

Average rainfall days - Sendai, Japan

The month with the highest number of rainy days is July (20.7 days).
The month with the least rainy days is January (8.7 days).

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Average snowfall
Sendai, Japan

Average snowfall - Sendai, Japan

The month with the highest snowfall is February (63mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).

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Average snowfall days
Sendai, Japan

Average snowfall days - Sendai, Japan

The month with the highest number of snowfall days is February (9.2 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).

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Average sea temperature
Sendai, Japan

Average sea temperature - Sendai, Japan

The best month for swimming (with the highest average sea temperature) is August (23.9°C).
The coldest month (with the lowest average sea temperature) is March (7.5°C).

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Average daylight / Average sunshine
Sendai, Japan

Average daylight / Average sunshine - Sendai, Japan

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

The month with the most sunshine is May (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).

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Average sunshine days
Sendai, Japan

Average sunshine days - Sendai, Japan

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is July (7.2 days).

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Average UV index
Sendai, Japan

Average UV index - Sendai, Japan

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Sendai, Japan

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