Last updated: June 24, 2025
In September, the average temperature in West Lafayette, United States is a pleasant 20°C (69°F). However, temperatures can vary significantly, with minimums dipping to 4°C (40°F) and maximums soaring to 35°C (95°F). Be prepared for some rain, as the area sees approximately 107 mm (4.2 in) of precipitation spread over 9 days. Humidity levels are typically high, averaging around 77%, making the air feel quite warm and tropical.
In September in West Lafayette, the average temperature is 20°C (69°F). Maximums can reach 35°C (95°F), and minimums can be as low as 4°C (40°F). This weather makes West Lafayette an ideal destination for travelers seeking both warmth and cool, refreshing evenings.
In West Lafayette in September, the precipitation amount is 107 mm (4.2 in), occurring over a span of 9 days.
In West Lafayette in September, humidity is 77%. With an average temperature of 20°C (69°F), this humidity feels like a sultry embrace, making travel comfortable yet slightly sticky, as the moist air clings to your skin with every step you take.
In West Lafayette in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in West Lafayette.
UV Risk Categories
Weather in West Lafayette varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in West Lafayette, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 92 mm (3.6 inches) | 88% | moderate |
| February Weather | 1°C (35°F) | 113 mm (4.5 inches) | 88% | moderate |
| March Weather | 6°C (42°F) | 109 mm (4.3 inches) | 87% | high |
| April Weather | 11°C (52°F) | 129 mm (5.1 inches) | 87% | very high |
| May Weather | 17°C (63°F) | 131 mm (5.1 inches) | 81% | very high |
| June Weather | 22°C (71°F) | 141 mm (5.5 inches) | 83% | very high |
| July Weather | 24°C (76°F) | 114 mm (4.5 inches) | 82% | very high |
| August Weather | 23°C (73°F) | 93 mm (3.6 inches) | 76% | very high |
| September Weather | 20°C (69°F) | 107 mm (4.2 inches) | 77% | very high |
| October Weather | 14°C (58°F) | 107 mm (4.2 inches) | 82% | high |
| November Weather | 6°C (42°F) | 99 mm (3.9 inches) | 89% | moderate |
| December Weather | 2°C (37°F) | 101 mm (4.0 inches) | 86% | low |