Last updated: August 22, 2025
In September, the average temperature in Mountain River, Australia hovers around 10°C (50°F), with a minimum dip to 1°C (34°F) and a maximum rise to 23°C (74°F). Expect a precipitation amount of 54 mm (2.1 in) across approximately 13 days, contributing to an average humidity level of 82%. Make sure to pack accordingly for this humid climate!
In September in Mountain River, the average temperature is 10°C (50°F), with a maximum reaching 23°C (74°F) and a minimum dropping as low as 1°C (34°F). Be prepared for a mix of mild and cool weather, making it ideal for exploring and enjoying outdoor activities.
In Mountain River in September, the precipitation amount is 54 mm (2.1 in), falling over the course of 13 days.
In Mountain River in September, humidity is 82%. With an average temperature of 10°C (50°F), this humidity feels like a dense, heavy blanket wrapping around you, making every step feel sluggish and the air thick, which can make traveling quite uncomfortable.
In Mountain River in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Mountain River, you can refer to this Hourly UV Index in Mountain River.
UV Risk Categories
Weather in Mountain River varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Mountain River, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 17°C (63°F) | 40 mm (1.6 inches) | 68% | extreme |
| February Weather | 16°C (60°F) | 48 mm (1.9 inches) | 68% | extreme |
| March Weather | 15°C (60°F) | 65 mm (2.6 inches) | 73% | very high |
| April Weather | 13°C (55°F) | 48 mm (1.9 inches) | 81% | high |
| May Weather | 10°C (51°F) | 53 mm (2.1 inches) | 86% | moderate |
| June Weather | 9°C (48°F) | 55 mm (2.2 inches) | 85% | low |
| July Weather | 8°C (46°F) | 46 mm (1.8 inches) | 86% | low |
| August Weather | 8°C (47°F) | 69 mm (2.7 inches) | 84% | moderate |
| September Weather | 10°C (50°F) | 54 mm (2.1 inches) | 82% | high |
| October Weather | 12°C (53°F) | 85 mm (3.3 inches) | 77% | very high |
| November Weather | 14°C (57°F) | 69 mm (2.7 inches) | 77% | very high |
| December Weather | 15°C (59°F) | 66 mm (2.6 inches) | 70% | extreme |