Climate and monthly weather forecastSendai, Japan
Climate and monthly weather forecast
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 »Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
In Sendai, during the entire year, the rain falls for 152.2 days and collects up to 720mm (28.35") of precipitation.
Months with snowfall in Sendai are January through April and December.
Throughout the year, in Sendai, Japan, there are 27.1 snowfall days, and 195mm (7.68") of snow is accumulated.
January has the least sunshine of the year in Sendai, Japan, with an average of 5.1h of sunshine.
The months with the lowest UV index in Sendai are January through March, November and December, with an average maximum UV index of 2.
February is the month with the least rainfall. Rain falls for 8.8 days and accumulates 22mm (0.87") of precipitation.
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.
The month with the coldest seawater is March, with an average sea temperature of 7.5°C (45.5°F).
The months with the lowest humidity in Sendai are April and May, with an average relative humidity of 72%.
May through November are months without snowfall.
May has the most sunshine of the year, with an average of 9.5h of sunshine.
The month with the longest days in Sendai is June, with an average of 14h and 48min of daylight.
With an average relative humidity of 84%, July is the most humid month in Sendai, Japan.
The wettest months in Sendai, Japan, are July and October, with an average 111mm (4.37") of rainfall.
The months with the highest UV index are July and August, with an average maximum UV index of 6.
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).
With an average sea temperature of 23.9°C (75°F), August is the month with the warmest seawater in Sendai.
The month with the shortest days in Sendai, Japan, is December, with an average of 9h and 36min of daylight.
Sendai, Japan, does not observe Daylight Saving Time (DST). JST timezone is used over the entire year.
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).
Average pressure
Sendai, Japan
- Average pressure in January:
1016.2mbar - Average pressure in February:
1017.7mbar - Average pressure in March:
1016.1mbar - Average pressure in April:
1014.6mbar - Average pressure in May:
1012mbar - Average pressure in June:
1009.3mbar
- Average pressure in July:
1009.4mbar - Average pressure in August:
1010.2mbar - Average pressure in September:
1014mbar - Average pressure in October:
1017.5mbar - Average pressure in November:
1018.7mbar - Average pressure in December:
1016.2mbar
The month with the highest atmospheric pressure is November (1018.7mbar).
The month with the lowest atmospheric pressure is June (1009.3mbar).
Average wind speed
Sendai, Japan
- Average wind speed in January:
14.4km/h - Average wind speed in February:
14.1km/h - Average wind speed in March:
13.7km/h - Average wind speed in April:
12.9km/h - Average wind speed in May:
11.1km/h - Average wind speed in June:
9.5km/h
- Average wind speed in July:
8.1km/h - Average wind speed in August:
8.7km/h - Average wind speed in September:
9.7km/h - Average wind speed in October:
11.7km/h - Average wind speed in November:
11.9km/h - Average wind speed in December:
14km/h
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).
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%).
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).
Average rainfall days
Sendai, Japan
- Average rainfall days in January:
8.7 days - Average rainfall days in February:
8.8 days - Average rainfall days in March:
12.6 days - Average rainfall days in April:
13.3 days - Average rainfall days in May:
11.5 days - Average rainfall days in June:
16.2 days
- Average rainfall days in July:
20.7 days - Average rainfall days in August:
16.7 days - Average rainfall days in September:
12.9 days - Average rainfall days in October:
11.8 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
9.5 days
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).
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).
Average snowfall days
Sendai, Japan
- Average snowfall days in January:
7.9 days - Average snowfall days in February:
9.2 days - Average snowfall days in March:
5.2 days - Average snowfall days in April:
0.5 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
4.3 days
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).
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).
Average daylight / Average sunshine
Sendai, Japan
- Average daylight in January:
9h and 48min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 12min - Average daylight in June:
14h and 48min
- Average daylight in July:
14h and 30min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 6min - Average daylight in December:
9h and 36min
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).
- Average sunshine in January:
5h and 6min - Average sunshine in February:
5h and 12min - Average sunshine in March:
6h and 42min - Average sunshine in April:
9h and 0min - Average sunshine in May:
9h and 30min - Average sunshine in June:
8h and 54min
- Average sunshine in July:
8h and 30min - Average sunshine in August:
9h and 6min - Average sunshine in September:
7h and 42min - Average sunshine in October:
7h and 18min - Average sunshine in November:
5h and 54min - Average sunshine in December:
5h and 30min
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).
Average sunshine days
Sendai, Japan
- Average sunshine days in January:
17.3 days - Average sunshine days in February:
13.2 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
14 days - Average sunshine days in May:
16.7 days - Average sunshine days in June:
10.6 days
- Average sunshine days in July:
7.2 days - Average sunshine days in August:
10.6 days - Average sunshine days in September:
14.1 days - Average sunshine days in October:
16.3 days - Average sunshine days in November:
17.6 days - Average sunshine days in December:
17.3 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is July (7.2 days).
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).
Average cloud cover
Sendai, Japan
The month with the most cloud cover is July (Cloud cover 49).
The month with the least cloud cover is May (Cloud cover 36).
Average visibility
Sendai, Japan
The months with the highest visibility are October, November and December (10km).
The month with the lowest visibility is July (8km).
