Last updated: June 24, 2025
In September, the average temperature in Humboldt, United States hovers around 22°C (71°F). You can expect a range from a chilly 6°C (43°F) to a warm 36°C (97°F). With an average precipitation of 79 mm (3.1 in) spread over 9 days, the air remains fairly humid, with an average humidity of 75%. Whether you’re enjoying the warmth or preparing for a sprinkle, be ready for a blend of delightful weather!
In September in Humboldt, the average temperature is 22°C (71°F). The maximum can reach 36°C (97°F), while the minimum can drop to as low as 6°C (43°F). This diverse temperature range makes it essential to pack both light clothing for the warm days and warmer layers for the cooler evenings during your travels.
In Humboldt in September, the precipitation amount is 79 mm (3.1 in) spread over 9 days.
In Humboldt in September, humidity is 75%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making traveling a bit sticky but also invigorating, as the air surrounds you with a heavy yet refreshing sensation that highlights the vibrant atmosphere of your surroundings.
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.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (28°F) | 33 mm (1.3 inches) | 76% | moderate |
| February Weather | -2°C (29°F) | 31 mm (1.2 inches) | 80% | moderate |
| March Weather | 7°C (44°F) | 95 mm (3.7 inches) | 73% | high |
| April Weather | 11°C (53°F) | 70 mm (2.8 inches) | 74% | very high |
| May Weather | 18°C (65°F) | 164 mm (6.5 inches) | 78% | very high |
| June Weather | 25°C (77°F) | 109 mm (4.3 inches) | 82% | very high |
| July Weather | 26°C (80°F) | 102 mm (4.0 inches) | 83% | very high |
| August Weather | 24°C (76°F) | 111 mm (4.4 inches) | 80% | very high |
| September Weather | 22°C (71°F) | 79 mm (3.1 inches) | 75% | very high |
| October Weather | 13°C (55°F) | 131 mm (5.1 inches) | 75% | high |
| November Weather | 6°C (43°F) | 33 mm (1.3 inches) | 82% | moderate |
| December Weather | 1°C (35°F) | 31 mm (1.2 inches) | 83% | moderate |