Last updated: August 23, 2025
In Petaejaevesi, Finland, the average temperature in September hovers around 10°C (50°F). During this time, you can expect a minimum of -4°C (26°F) and a maximum of 22°C (73°F). Be prepared for some wet days, as precipitation typically reaches 73 mm (2.9 in) over 12 days. With an average humidity of 91%, it's a perfect time to embrace the cozy atmosphere!
In September in Petaejaevesi, the weather is quite varied, with average temperatures around 10°C (50°F). The maximum can reach a pleasant 22°C (73°F), while the minimum can drop to a chilly -4°C (26°F). Be sure to pack layers to comfortably enjoy your travels during this month!
In Petaejaevesi in September, the precipitation amount is 73 mm (2.9 in) occurring over a span of 12 days.
In Petaejaevesi in September, humidity is 91%. With an average temperature of 10°C (50°F), this humidity feels like an enveloping dampness that makes traveling a bit uncomfortable, as the moisture clings to your skin and dampens your clothes, soaking up any residual warmth from the cool air.
In Petaejaevesi in September, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Petaejaevesi, you can check the information here.
UV Risk Categories
Weather in Petaejaevesi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Petaejaevesi, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (22°F) | 47 mm (1.9 inches) | 99% | low |
| February Weather | -6°C (21°F) | 45 mm (1.8 inches) | 97% | low |
| March Weather | -3°C (28°F) | 43 mm (1.7 inches) | 95% | moderate |
| April Weather | 2°C (36°F) | 47 mm (1.9 inches) | 87% | moderate |
| May Weather | 9°C (49°F) | 63 mm (2.5 inches) | 78% | moderate |
| June Weather | 16°C (61°F) | 58 mm (2.3 inches) | 74% | high |
| July Weather | 17°C (63°F) | 70 mm (2.7 inches) | 80% | high |
| August Weather | 15°C (59°F) | 93 mm (3.6 inches) | 85% | moderate |
| September Weather | 10°C (50°F) | 73 mm (2.9 inches) | 91% | moderate |
| October Weather | 5°C (41°F) | 76 mm (3.0 inches) | 95% | low |
| November Weather | 1°C (34°F) | 65 mm (2.6 inches) | 94% | low |
| December Weather | -3°C (26°F) | 69 mm (2.7 inches) | 98% | low |