Last updated: June 24, 2025
In September, the average temperature in Fortuna, United States hovers around 16°C (61°F). While you can expect a minimum of 8°C (47°F), the mercury can rise as high as 32°C (90°F). During this time, the area receives about 20 mm (0.8 in) of precipitation over 3 days, and average humidity rests at a comfortable 62%.
In September in Fortuna, the average temperature is 16°C (61°F). Maximum can reach 32°C (90°F) and minimum can be as low as 8°C (47°F). Be prepared for a range of temperatures, making it ideal for both outdoor activities and comfortable evenings.
In Fortuna in September, the precipitation amount is 20 mm (0.8 in) accumulated over a period of 3 days.
In Fortuna in September, humidity is 62%. With an average temperature of 16°C (61°F), this humidity feels like a gentle blanket, making traveling comfortable yet occasionally sticky, prompting the need for light, breathable clothing to fully enjoy the sights.
In Fortuna 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 Fortuna.
UV Risk Categories
Weather in Fortuna varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Fortuna, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 9°C (48°F) | 205 mm (8.1 inches) | 86% | moderate |
February Weather | 8°C (47°F) | 188 mm (7.4 inches) | 85% | moderate |
March Weather | 9°C (48°F) | 164 mm (6.5 inches) | 85% | high |
April Weather | 10°C (51°F) | 93 mm (3.7 inches) | 82% | very high |
May Weather | 12°C (53°F) | 61 mm (2.4 inches) | 81% | very high |
June Weather | 14°C (57°F) | 17 mm (0.7 inches) | 79% | extreme |
July Weather | 15°C (59°F) | 2 mm (0.1 inches) | 70% | very high |
August Weather | 16°C (61°F) | 2 mm (0.1 inches) | 60% | very high |
September Weather | 16°C (61°F) | 20 mm (0.8 inches) | 62% | very high |
October Weather | 13°C (56°F) | 49 mm (1.9 inches) | 72% | high |
November Weather | 11°C (51°F) | 112 mm (4.4 inches) | 87% | moderate |
December Weather | 9°C (48°F) | 150 mm (5.9 inches) | 86% | low |