Sendai Weather in September

September in Sendai brings high temperatures, with highs of 25°C (77°F) and nights dropping to 19°C (66°F). The rainy season is in full swing this month, so frequent downpours are part of the picture.

Rainfall in Sendai in September

As part of the rainy season, Sendai sees around 20 days of rain in September, with an average of 188 mm (7.4 in). Rain during the rainy season is significant rather than just light drizzle. Expect proper showers on most rainy days.

Temperature in Sendai in September

Daytime temperatures in Sendai reach 25°C (77°F) in September, dropping to 19°C (66°F) at night. The summer season takes place during September. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights cool down to 19°C (66°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Sendai in September

The area experiences a moderate amount of sunshine, with approximately 127 hours of sunlight expected. Even though this month is part of the rainy season, you could still see the sun every now and then.

Wind Speed in Sendai in September

September has wind speeds averaging 3 m/s (6 knots). You can expect comfortable light winds that steadily move flags and feel mild throughout the day. Since this is an average, daily conditions vary from gentle winds to more active breezes.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. June, August and October typically offer the best weather for Sendai.

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For a detailed overview over the year and the best time to visit Japan, check out our Sendai's climate page.

Sendai Temperature in September

Min Temperature 19°C (66°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 65%  

Precipitation 188 mm (7.4 in)  

Rainy days 20 days  

Humidity 79%  

Windspeed 3 m/s (6 knots)  

Sunshine 127 hours  

Percentage Sunshine 32%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Sendai typically drop from around 27°C (81°F) at the start of September to approximately 22°C (72°F) by the end. Nights are pleasant, with lows typically ranging from 15°C (59°F) to 21°C (70°F).

Average temperatures in September

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Sendai in September

Browse day-by-day weather records for Sendai spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Sendai historical weather extremes in September

Based on weather observations in Sendai between 1976 and 2025, these are the recorded extremes during September.

• The hottest September day on record in Sendai reached 35°C (95°F) (September 1, 1985).
• Sendai experienced its chilliest September day on September 23, 2010, reaching only 15°C (59°F).
• The lowest overnight temperature recorded in September was 6°C (43°F) (September 29, 2001).

What to Wear in Sendai in September

For Sendai in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Sendai in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Camping

6/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Japan, check out our Sendai's climate page.

More climate data for Sendai

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Sendai climate overview or explore weather in Japan.