The average temperature in Hakodate in September is 18.8 °C (65.8 °F). It is just enough temperature to make you wonder what to wear.
Daytime temperatures are relatively comfortable, sometimes exceeding 20°C (68°F), but because of the temperature difference between morning and evening, the minimum temperature can drop below 10°C (50°F), so it is advisable to bring a jacket.
Also, temperatures tend to drop when it rains, so if it rains on the day, a slightly thicker jacket may be a good idea.
Weather in the last 5 years
Weather at September 21st, 2019 - Cloudiness / Highest 21.3°C(70.3°F) / Lowest 9.8°C(49.6°F)
Weather at September 21st, 2020 - Cloudy, fine later / Highest 21.3°C(74.8°F) / Lowest 9.8°C(49.6°F)
Weather at September 21st, 2021 - Fair / Highest 24.1°C(75.3°F) / Lowest 16.6°C(61.8°F)
Weather at September 21st, 2022 - Cloudy, fine later / Highest 20.1°C(68.1°F) / Lowest 8.5°C(47.3°F)
Weather at September 21st, 2023 - Rainy / Highest 18.7°C(65.6°F) / Lowest 13.6°C(56.4°F)
By the way, the weather forecast on September 21st, 2024 will be…
Unfortunately, it was not yet announced at this time!
Let’s pray for comfortable weather on the day of the anomaly.
It is recommended to prepare both short sleeves and a measures against the cold in the morning and evening to enjoy a comfort stay in September In Hakodate.
If the weather is clear, you can basically spend the day in short sleeves, but the temperature can drop dramatically in the mornings and evenings, so it is advisable to bring a long-sleeved jacket.
Also, be sure to bring rain gear and a towel in case of rain. Even in September, ultraviolet rays are still strong, so a folding umbrella that can be used in both sunny and rainy weather will help protect against UV rays.