Last updated: June 24, 2025
In Saint Charles, United States, the average temperature in June is a pleasant 21°C (71°F). However, you can expect a wide range, with minimum temperatures dropping to 7°C (45°F) and peaks reaching 34°C (94°F). Be prepared for rain, as the area typically experiences around 151 mm (5.9 in) of precipitation over 13 days. With an average humidity of 79%, it’s advisable to stay hydrated and plan your outdoor activities accordingly!
In June in Saint Charles, the average temperature is 21°C (71°F). The maximum can reach 34°C (94°F), while the minimum can be as low as 7°C (45°F). This range makes it a great time to visit for those who enjoy mild to warm weather with the possibility of cooler evenings.
In Saint Charles in June, the precipitation amount is 151 mm (5.9 in) over the course of 13 days.
In Saint Charles in June humidity is 79%. With an average temperature of 21°C (71°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel laborious and exhausting. Travelers should be prepared to hydrate frequently and take breaks in shaded areas to fully enjoy their time exploring.
In Saint Charles in June, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 June’s weather to other months in Saint Charles, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 36 mm (1.4 inches) | 84% | moderate |
| February Weather | -7°C (19°F) | 48 mm (1.9 inches) | 85% | moderate |
| March Weather | 1°C (34°F) | 57 mm (2.2 inches) | 84% | moderate |
| April Weather | 7°C (44°F) | 86 mm (3.4 inches) | 83% | very high |
| May Weather | 15°C (59°F) | 152 mm (6.0 inches) | 75% | very high |
| June Weather | 21°C (71°F) | 151 mm (5.9 inches) | 79% | very high |
| July Weather | 23°C (74°F) | 103 mm (4.1 inches) | 75% | very high |
| August Weather | 21°C (70°F) | 126 mm (5.0 inches) | 69% | very high |
| September Weather | 18°C (64°F) | 117 mm (4.6 inches) | 74% | very high |
| October Weather | 9°C (49°F) | 118 mm (4.7 inches) | 79% | moderate |
| November Weather | 1°C (34°F) | 52 mm (2.0 inches) | 88% | moderate |
| December Weather | -4°C (26°F) | 43 mm (1.7 inches) | 82% | low |