Hamamatsu Weather in September
Hamamatsu in September averages 29°C (84°F) during the day and 22°C (72°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Hamamatsu in September
You can expect rain on roughly 18 days based on historical data, averaging 264 mm (10 in) for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Hamamatsu in September
Daytime highs in Hamamatsu in September reach 29°C (84°F), with nights around 22°C (72°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. At 22°C (72°F) overnight, nights are warm enough to sit outside comfortably in light clothing.
Sunshine in Hamamatsu in September
The city usually sees around 169 hours of sunlight, indicating a moderately sunny period.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Hamamatsu. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Hamamatsu's climate page.
Hamamatsu Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
29°C (84°F)
Chance of Rain
58%
Precipitation
264 mm (10 in)
Rainy days
18 days
Humidity
74%
Sunshine
169 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Hamamatsu typically drop from around 30°C (86°F) at the start of September to approximately 26°C (79°F) by the end. Nights are warm, with lows typically ranging from 19°C (66°F) to 24°C (75°F).
Average temperatures in September
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
Historical weather for Hamamatsu in September
Browse day-by-day weather records for Hamamatsu spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Hamamatsu historical weather extremes in September
According to our 49 years of weather records for Hamamatsu, the following extremes were recorded between 1976 and 2025.
- The hottest September day on record in Hamamatsu reached 36°C (97°F) (September 3, 2003).
- On September 27, 1980, Hamamatsu saw its coldest September day with temperatures maxing out at 17°C (63°F).
- Nighttime temperatures dropped to 12°C (54°F) on September 28, 1980, marking the coldest September night on record.
Best Places in Japan in September
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Hamamatsu in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Hamamatsu in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Hamamatsu's climate page.
Temperature Rainfall Sunshine Humidity
See the full Hamamatsu climate overview or explore weather in Japan.
