September Weather in Humboldt, United States

Last updated: June 24, 2025

In Humboldt, United States, the average temperature in September hovers around 18°C (65°F), with daily variations ranging from a cool 3°C (38°F) to a warm 32°C (90°F). Expect about 106 mm (4.2 in) of precipitation spread over 9 days, contributing to an average humidity level of 75%. Embrace the unique climate as you explore all that this destination has to offer!

September Temperature in Humboldt

In September in Humboldt, the average temperature is 18°C (65°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as 3°C (38°F). Be prepared for a range of weather conditions when traveling during this time.

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

The chart illustrates September temperature patterns in Humboldt, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Humboldt, September typically has an average temperature of 18°C (65°F), with highs reaching up to 32°C (90°F) and lows dropping to around 3°C (38°F).

Data source: Temperature data for Humboldt generated using information from the Copernicus Climate Change Service.

September Precipitation in Humboldt

In Humboldt in September, the total precipitation amount is 106 mm (4.2 in), spread over the course of 9 days.

September Precipitation Trends in Humboldt

The chart displays monthly precipitation patterns in Humboldt, 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 Humboldt, September typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Humboldt

In Humboldt in September, humidity is 75%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket that can make outdoor exploration feel a bit stifling, potentially leading to discomfort during travel activities.

September Average Humidity in Humboldt

This chart illustrates the average monthly humidity levels in Humboldt, 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 Humboldt is approximately 75%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Humboldt

In Humboldt 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 Humboldt.

Maximum UV Index Levels in Humboldt for September

The chart shows the monthly maximum UV Index (UVI) for Humboldt 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 Humboldt typically reaches 8, which falls under the very high exposure category.

Data source: Humboldt 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 Humboldt Compares to Other Months

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

This table compares monthly weather conditions in Humboldt, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	20 mm (0.8 inches)	80%	low
February Weather	-7°C (19°F)	22 mm (0.9 inches)	84%	moderate
March Weather	1°C (34°F)	63 mm (2.5 inches)	75%	moderate
April Weather	6°C (44°F)	78 mm (3.1 inches)	79%	very high
May Weather	15°C (58°F)	119 mm (4.7 inches)	74%	very high
June Weather	22°C (72°F)	79 mm (3.1 inches)	81%	extreme
July Weather	24°C (75°F)	88 mm (3.5 inches)	82%	very high
August Weather	22°C (71°F)	104 mm (4.1 inches)	80%	very high
September Weather	18°C (65°F)	106 mm (4.2 inches)	75%	very high
October Weather	8°C (48°F)	76 mm (3.0 inches)	77%	moderate
November Weather	1°C (34°F)	26 mm (1.0 inches)	85%	moderate
December Weather	-4°C (26°F)	37 mm (1.5 inches)	83%	low