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September Weather in Kamaishi, Japan

Last updated: August 23, 2025

In Kamaishi, Japan, the average temperature in September hovers around 20°C (67°F), providing a pleasant climate. However, be prepared for fluctuations, as temperatures can dip to a chilly 8°C (47°F) or soar to a warm 31°C (88°F). The month also sees 171 mm (6.7 in) of precipitation spread over 15 days, contributing to a humid atmosphere with an average humidity of 86%.

September Temperature in Kamaishi

In September in Kamaishi, the average temperature is 20°C (67°F), with maximums reaching 31°C (88°F) and minimums dipping as low as 8°C (47°F). This diverse temperature range makes it an ideal time for travelers to enjoy a variety of outdoor activities and pack accordingly for both warm days and cooler evenings.

September Weather in Kamaishi: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Kamaishi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kamaishi, September typically has an average temperature of 20°C (67°F), with highs reaching up to 31°C (88°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec333340475763707367574736
Data source: Temperature data for Kamaishi generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Kamaishi

In Kamaishi in September, the total precipitation amount is 171 mm (6.7 in) spread over 15 days.

September Precipitation Trends in Kamaishi

The chart displays monthly precipitation patterns in Kamaishi, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Kamaishi, September typically receives around 171 mm (6.7 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec45561211231181351872081712235667
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kamaishi

In Kamaishi in September, humidity is 86%. With an average temperature of 20°C (67°F), this humidity feels like a warm blanket wrapping around you, making travel feel sticky and heavy; it's advisable to stay hydrated and take frequent breaks in the shade.

September Average Humidity in Kamaishi

This chart illustrates the average monthly humidity levels in Kamaishi, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Kamaishi is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%77%75%80%87%92%92%86%82%79%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kamaishi

In Kamaishi in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Kamaishi.

Maximum UV Index Levels in Kamaishi for September

The chart shows the monthly maximum UV Index (UVI) for Kamaishi in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Kamaishi typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346891110109643
Data source: Kamaishi September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Kamaishi Compares to Other Months

Weather in Kamaishi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Kamaishi, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Kamaishi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)45 mm (1.8 inches)80%moderate
February Weather1°C (33°F)56 mm (2.2 inches)79%moderate
March Weather4°C (40°F)121 mm (4.8 inches)77%high
April Weather8°C (47°F)123 mm (4.9 inches)75%very high
May Weather14°C (57°F)118 mm (4.7 inches)80%very high
June Weather17°C (63°F)135 mm (5.3 inches)87%extreme
July Weather21°C (70°F)187 mm (7.3 inches)92%very high
August Weather23°C (73°F)208 mm (8.2 inches)92%very high
September Weather20°C (67°F)171 mm (6.7 inches)86%very high
October Weather14°C (58°F)223 mm (8.8 inches)82%high
November Weather8°C (47°F)56 mm (2.2 inches)79%moderate
December Weather2°C (36°F)67 mm (2.6 inches)80%moderate

Compare Kamaishi's Climate with Cities Worldwide