Last updated: June 24, 2025
In June, the average temperature in Saint Charles, United States hovers around 21°C (70°F), with temperatures ranging from a cool 5°C (42°F) to a warm 35°C (95°F). Expect 121 mm (4.8 in) of precipitation spread over 13 days, and a relatively high humidity level of 80%. Whether you're basking in the warmth or dodging the rain, it's a month full of diverse weather experiences!
In June in Saint Charles, the average temperature is 21°C (70°F), with maximums reaching 35°C (95°F) and minimums dropping as low as 5°C (42°F). This diverse range in temperatures makes it essential to pack for both warm days and cooler evenings during your travels.
In Saint Charles in June, the total precipitation amount is 121 mm (4.8 in) over the course of 13 days.
In Saint Charles in June humidity is 80%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can make even short walks feel draining, urging travelers to seek shade or a cool drink frequently.
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 | -4°C (25°F) | 59 mm (2.3 inches) | 88% | low |
| February Weather | -3°C (26°F) | 63 mm (2.5 inches) | 87% | moderate |
| March Weather | 2°C (36°F) | 61 mm (2.4 inches) | 85% | moderate |
| April Weather | 8°C (46°F) | 88 mm (3.4 inches) | 86% | very high |
| May Weather | 15°C (59°F) | 115 mm (4.5 inches) | 80% | very high |
| June Weather | 21°C (70°F) | 121 mm (4.8 inches) | 80% | very high |
| July Weather | 23°C (75°F) | 66 mm (2.6 inches) | 80% | very high |
| August Weather | 22°C (72°F) | 76 mm (3.0 inches) | 80% | very high |
| September Weather | 18°C (65°F) | 101 mm (4.0 inches) | 80% | high |
| October Weather | 11°C (53°F) | 112 mm (4.4 inches) | 84% | moderate |
| November Weather | 3°C (38°F) | 60 mm (2.4 inches) | 89% | moderate |
| December Weather | 0°C (32°F) | 60 mm (2.4 inches) | 86% | low |