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September Weather in Uonuma, Japan

Last updated: August 23, 2025

In September, the average temperature in Uonuma, Japan hovers around 21°C (69°F). Expect cool dips to a minimum of 9°C (48°F), while the thermometer can soar to a maximum of 34°C (94°F). While exploring, be prepared for 180 mm (7.1 in) of precipitation across 19 days, and don't forget to stay hydrated as the average humidity lingers at a tropical 89%!

September Temperature in Uonuma

In September, in Uonuma, the average temperature is 21°C (69°F). The maximum can reach 34°C (94°F), while the minimum can drop to as low as 9°C (48°F). This varied climate makes Uonuma an ideal destination for travelers seeking both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Uonuma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Uonuma, September typically has an average temperature of 21°C (69°F), with highs reaching up to 34°C (94°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec313239486167757769584735
Data source: Temperature data for Uonuma 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 Uonuma

In Uonuma in September, the precipitation amounts to 180 mm (7.1 in) over a span of 19 days.

September Precipitation Trends in Uonuma

The chart displays monthly precipitation patterns in Uonuma, 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 Uonuma, September typically receives around 180 mm (7.1 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec254244193171168177371195181228178283
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Uonuma

In Uonuma in September, humidity is 89%. With an average temperature of 21°C (69°F), this humidity feels like a warm blanket enveloping you, making travel a bit sticky and requiring frequent breaks to cool off and stay hydrated.

September Average Humidity in Uonuma

This chart illustrates the average monthly humidity levels in Uonuma, 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 Uonuma is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%79%81%88%92%92%89%87%85%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Uonuma

In Uonuma 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 Uonuma.

Maximum UV Index Levels in Uonuma for September

The chart shows the monthly maximum UV Index (UVI) for Uonuma 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 Uonuma typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589101111119753
Data source: Uonuma 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 Uonuma Compares to Other Months

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

This table compares monthly weather conditions in Uonuma, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (31°F)254 mm (10.0 inches)88%moderate
February Weather0°C (32°F)244 mm (9.6 inches)86%moderate
March Weather4°C (39°F)193 mm (7.6 inches)81%very high
April Weather9°C (49°F)171 mm (6.7 inches)78%very high
May Weather16°C (61°F)168 mm (6.6 inches)81%very high
June Weather19°C (67°F)177 mm (7.0 inches)88%extreme
July Weather24°C (75°F)371 mm (14.6 inches)92%extreme
August Weather25°C (77°F)195 mm (7.7 inches)92%extreme
September Weather21°C (69°F)180 mm (7.1 inches)89%very high
October Weather15°C (59°F)228 mm (9.0 inches)87%high
November Weather8°C (47°F)178 mm (7.0 inches)85%moderate
December Weather2°C (35°F)283 mm (11.2 inches)86%moderate

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