Last updated: August 27, 2025
In September, the average temperature in Onderdendam, Netherlands hovers around 15°C (59°F), providing a comfortable climate for outdoor activities. Expect minimums of 5°C (42°F) and maximums of 29°C (85°F), giving you a wide range of conditions to enjoy. Be prepared for 67 mm (2.6 in) of precipitation over about 12 days, which contributes to the region's average humidity of 83%. Pack accordingly!
In September in Onderdendam, the average temperature is 15°C (59°F). Maximums can reach up to 29°C (85°F), while minimums can dip as low as 5°C (42°F). This makes Onderdendam a great destination for travelers seeking mild weather with the possibility of warm days, perfect for outdoor activities and exploration.
In Onderdendam in September, the precipitation amount is 67 mm (2.6 in) distributed over 12 days.
In Onderdendam in September humidity is 83%. With an average temperature of 15°C (59°F), this humidity feels like a cozy, damp embrace that can be quite stifling for traveling, making even short walks feel more exhausting than they should, and prompting a need for frequent breaks in shaded or air-conditioned areas.
In Onderdendam in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Onderdendam.
UV Risk Categories
Weather in Onderdendam varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Onderdendam, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 59 mm (2.3 inches) | 88% | low |
| February Weather | 4°C (40°F) | 57 mm (2.3 inches) | 88% | low |
| March Weather | 6°C (43°F) | 67 mm (2.7 inches) | 86% | moderate |
| April Weather | 9°C (48°F) | 44 mm (1.7 inches) | 84% | moderate |
| May Weather | 12°C (55°F) | 68 mm (2.7 inches) | 80% | high |
| June Weather | 17°C (63°F) | 78 mm (3.1 inches) | 75% | very high |
| July Weather | 18°C (64°F) | 95 mm (3.7 inches) | 75% | high |
| August Weather | 18°C (65°F) | 89 mm (3.5 inches) | 75% | high |
| September Weather | 15°C (59°F) | 67 mm (2.6 inches) | 83% | moderate |
| October Weather | 12°C (53°F) | 85 mm (3.3 inches) | 86% | moderate |
| November Weather | 7°C (45°F) | 51 mm (2.0 inches) | 87% | low |
| December Weather | 5°C (41°F) | 74 mm (2.9 inches) | 86% | low |