Last updated: August 28, 2025
In September, the average temperature in Ky Son, Vietnam is a warm 27°C (81°F). Visitors can expect a comfortable minimum temperature of 21°C (70°F), while the heat can peak at a brisk 35°C (95°F). However, don't forget your umbrella, as there's an average precipitation of 246 mm (9.7 in) spread over 21 days. With an average humidity of 82%, the air feels quite tropical, making it a vibrant time to experience all that Ky Son has to offer!
In September in Ky Son, the average temperature is 27°C (81°F), with maximums reaching up to 35°C (95°F) and minimums dropping as low as 21°C (70°F). This pleasant climate makes it an ideal destination for travelers seeking warm weather and outdoor activities.
In Ky Son in September, the total precipitation amount is 246 mm (9.7 in) across 21 days.
In Ky Son in September humidity is 82%. With an average temperature of 27°C (81°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel more exhausting, and leaving you longing for the relief of air-conditioned spaces during your travels.
In Ky Son in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Ky Son.
UV Risk Categories
Weather in Ky Son varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ky Son, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 17°C (63°F) | 60 mm (2.4 inches) | 66% | very high |
| February Weather | 18°C (64°F) | 39 mm (1.5 inches) | 71% | very high |
| March Weather | 22°C (71°F) | 69 mm (2.7 inches) | 69% | extreme |
| April Weather | 24°C (75°F) | 162 mm (6.4 inches) | 64% | extreme |
| May Weather | 27°C (81°F) | 179 mm (7.0 inches) | 73% | extreme |
| June Weather | 30°C (85°F) | 259 mm (10.2 inches) | 81% | extreme |
| July Weather | 29°C (84°F) | 334 mm (13.2 inches) | 90% | extreme |
| August Weather | 28°C (83°F) | 423 mm (16.6 inches) | 89% | extreme |
| September Weather | 27°C (81°F) | 246 mm (9.7 inches) | 82% | extreme |
| October Weather | 24°C (76°F) | 292 mm (11.5 inches) | 77% | extreme |
| November Weather | 21°C (71°F) | 56 mm (2.2 inches) | 72% | very high |
| December Weather | 17°C (63°F) | 48 mm (1.9 inches) | 71% | high |