Last updated: June 24, 2025
In Saint Charles, United States, the average temperature for August hovers around 26°C (79°F), offering a pleasant climate for outdoor activities. However, be prepared for a range where the minimum can dip to 16°C (62°F) and the maximum can soar to 36°C (97°F). You'll experience 151 mm (5.9 in) of precipitation over approximately 16 days, accompanied by an average humidity of 72%. Dress accordingly and embrace the unique weather of this vibrant locale!
In August in Saint Charles, the average temperature is 26°C (79°F), with maximums reaching up to 36°C (97°F) and minimums dropping as low as 16°C (62°F). This range makes it a perfect time to explore outdoor activities while enjoying pleasant day temperatures.
In Saint Charles in August, the precipitation amount is 151 mm (5.9 in) over a span of 16 days.
In Saint Charles in August, humidity is 72%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel a bit more strenuous but also adding a tropical charm to your travels.
In Saint Charles in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Saint Charles.
UV Risk Categories
Weather in Saint Charles varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Saint Charles, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 62 mm (2.4 inches) | 84% | moderate |
| February Weather | 6°C (42°F) | 93 mm (3.7 inches) | 83% | moderate |
| March Weather | 9°C (48°F) | 77 mm (3.0 inches) | 83% | high |
| April Weather | 14°C (58°F) | 99 mm (3.9 inches) | 81% | very high |
| May Weather | 19°C (67°F) | 118 mm (4.6 inches) | 78% | very high |
| June Weather | 24°C (76°F) | 106 mm (4.2 inches) | 79% | very high |
| July Weather | 27°C (81°F) | 122 mm (4.8 inches) | 74% | very high |
| August Weather | 26°C (79°F) | 151 mm (5.9 inches) | 72% | very high |
| September Weather | 23°C (73°F) | 91 mm (3.6 inches) | 75% | very high |
| October Weather | 17°C (64°F) | 108 mm (4.2 inches) | 81% | high |
| November Weather | 9°C (49°F) | 78 mm (3.1 inches) | 85% | moderate |
| December Weather | 6°C (43°F) | 86 mm (3.4 inches) | 84% | moderate |