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September Weather in Weiser, United States

Last updated: June 24, 2025

In September, the average temperature in Weiser, United States hovers around 20°C (68°F). However, be prepared for a range of temperatures, with lows of 4°C (40°F) and highs reaching up to 39°C (103°F). Expect 11 mm (0.4 in) of precipitation spread over just 2 days, and enjoy a comfortable average humidity of 60%.

September Temperature in Weiser

In September in Weiser, the average temperature is 20°C (68°F). Maximum temperatures can reach as high as 39°C (103°F), while the minimum can drop to a cool 4°C (40°F). Be prepared for a diverse range of temperatures, making it essential to pack versatile clothing for your travels.

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

The chart illustrates September temperature patterns in Weiser, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Weiser, September typically has an average temperature of 20°C (68°F), with highs reaching up to 39°C (103°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec303344516170827968524132
Data source: Temperature data for Weiser 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 Weiser

In Weiser in September, the precipitation amount is 11 mm (0.4 in) over the course of 2 days.

September Precipitation Trends in Weiser

The chart displays monthly precipitation patterns in Weiser, 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 Weiser, September typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec4455342530191611212935
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Weiser

In Weiser in September, humidity is 60%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making traveling quite comfortable yet slightly sticky, perfect for leisurely strolls but reminding you to stay hydrated.

September Average Humidity in Weiser

This chart illustrates the average monthly humidity levels in Weiser, 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 Weiser is approximately 60%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%91%88%84%77%78%78%63%60%77%86%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Weiser

In Weiser in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Weiser.

Maximum UV Index Levels in Weiser for September

The chart shows the monthly maximum UV Index (UVI) for Weiser 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 Weiser typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356891110108542
Data source: Weiser 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 Weiser Compares to Other Months

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

This table compares monthly weather conditions in Weiser, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)44 mm (1.7 inches)90%moderate
February Weather1°C (33°F)55 mm (2.1 inches)91%moderate
March Weather7°C (44°F)34 mm (1.3 inches)88%high
April Weather11°C (52°F)25 mm (1.0 inches)84%very high
May Weather16°C (61°F)30 mm (1.2 inches)77%very high
June Weather21°C (71°F)19 mm (0.8 inches)78%extreme
July Weather28°C (82°F)1 mm (0.0 inches)77%very high
August Weather26°C (80°F)6 mm (0.2 inches)63%very high
September Weather20°C (68°F)11 mm (0.4 inches)60%very high
October Weather11°C (52°F)21 mm (0.8 inches)77%moderate
November Weather5°C (41°F)29 mm (1.1 inches)86%moderate
December Weather0°C (33°F)35 mm (1.4 inches)89%low

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