Last updated: August 23, 2025
In Sibbo, Finland, the average temperature in September hovers around 11°C (53°F). Expect a range from a brisk -2°C (28°F) to a pleasant 24°C (75°F), making it an intriguing month for weather enthusiasts. Be prepared for 68 mm (2.7 in) of precipitation spread over about 12 days, and don’t forget your umbrella! With an average humidity of 90%, it’s a month where you might feel the cozy embrace of moisture in the air.
In September in Sibbo, the average temperature is 11°C (53°F). The maximum can reach 24°C (75°F) and the minimum can be as low as -2°C (28°F). It's a perfect time for travelers to prepare for mild weather with some chilly evenings, making layers essential for comfort.
In Sibbo in September, the precipitation amount is 68 mm (2.7 in) over the course of 12 days.
In Sibbo in September, humidity is 90%. With an average temperature of 11°C (53°F), this humidity feels like a heavy cloak, making traveling feel sticky and exhausting, as the dampness clings to your skin and the chill in the air sharpens the discomfort, leaving you longing for a breath of fresh, dry air.
In Sibbo in September, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Sibbo for better planning.
UV Risk Categories
Weather in Sibbo varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sibbo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (26°F) | 53 mm (2.1 inches) | 98% | low |
| February Weather | -4°C (25°F) | 47 mm (1.8 inches) | 96% | low |
| March Weather | -1°C (30°F) | 49 mm (1.9 inches) | 93% | moderate |
| April Weather | 4°C (40°F) | 48 mm (1.9 inches) | 87% | moderate |
| May Weather | 10°C (51°F) | 54 mm (2.1 inches) | 75% | moderate |
| June Weather | 17°C (62°F) | 63 mm (2.5 inches) | 74% | high |
| July Weather | 18°C (64°F) | 83 mm (3.3 inches) | 80% | high |
| August Weather | 16°C (61°F) | 80 mm (3.2 inches) | 85% | moderate |
| September Weather | 11°C (53°F) | 68 mm (2.7 inches) | 90% | moderate |
| October Weather | 6°C (44°F) | 81 mm (3.2 inches) | 94% | low |
| November Weather | 3°C (37°F) | 55 mm (2.2 inches) | 94% | low |
| December Weather | -2°C (29°F) | 71 mm (2.8 inches) | 96% | low |