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August Weather in Niihama, Japan

Last updated: August 23, 2025

In August, the average temperature in Niihama, Japan rises to a warm 27°C (82°F), with minimums dipping to 20°C (68°F) and maximums soaring up to 33°C (91°F). However, prepare for some rain, as precipitation averages 181 mm (7.1 in) over 13 days. The air is notably humid, boasting an average humidity of 88%.

August Temperature in Niihama

In August in Niihama, the average temperature is 27°C (82°F). Maximum temperatures can reach 33°C (91°F), while the minimum can drop as low as 20°C (68°F). Overall, this makes Niihama an ideal destination for travelers seeking warm and pleasant weather during this month.

August Weather in Niihama: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Niihama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Niihama, August typically has an average temperature of 27°C (82°F), with highs reaching up to 33°C (91°F) and lows dropping to around 20°C (68°F).
JanFebMarAprMayJunJulAugSepOctNovDec424249566571788175665546
Data source: Temperature data for Niihama 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.

August Precipitation in Niihama

In Niihama in August, the total precipitation amount is 181 mm (7.1 in) spread over 13 days.

August Precipitation Trends in Niihama

The chart displays monthly precipitation patterns in Niihama, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Niihama, August typically receives around 181 mm (7.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec65851291421481993571812372536980
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Niihama

In Niihama in August humidity is 88%. With an average temperature of 27°C (82°F), this humidity feels like a warm, enveloping blanket that can be quite discomforting for traveling, leaving you drenched in sweat and longing for a cool breeze.

August Average Humidity in Niihama

This chart illustrates the average monthly humidity levels in Niihama, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Niihama is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%70%70%76%83%86%91%88%85%82%79%77%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Niihama

In Niihama in August, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Niihama.

Maximum UV Index Levels in Niihama for August

The chart shows the monthly maximum UV Index (UVI) for Niihama in August, 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 August, the maximum UV index in Niihama typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121210764
Data source: Niihama August 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 August Weather in Niihama Compares to Other Months

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

This table compares monthly weather conditions in Niihama, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)65 mm (2.6 inches)74%moderate
February Weather6°C (43°F)85 mm (3.4 inches)70%high
March Weather9°C (49°F)129 mm (5.1 inches)70%very high
April Weather13°C (57°F)142 mm (5.6 inches)76%very high
May Weather18°C (65°F)148 mm (5.8 inches)82%extreme
June Weather22°C (71°F)199 mm (7.8 inches)86%extreme
July Weather26°C (79°F)357 mm (14.1 inches)91%extreme
August Weather27°C (82°F)181 mm (7.1 inches)88%extreme
September Weather24°C (75°F)237 mm (9.3 inches)85%very high
October Weather19°C (66°F)253 mm (10.0 inches)82%high
November Weather13°C (56°F)69 mm (2.7 inches)79%high
December Weather8°C (46°F)80 mm (3.1 inches)77%moderate

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