Last updated: March 2, 2024
The weather in Grand Rapids, United States, during August is characterized by an average temperature of 23°C (74°F). Highs can soar to 32°C (90°F), while lows may dip to 12°C (55°F). Typically, the humidity level in Grand Rapids throughout August hovers around 78%.
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Average temperature
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Humidity
In August, Grand Rapids averages 88 mm (3.5 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 13 hours 45 minutes of daylight, with the sun shining for approximately 10 hours 46 minutes each day. Additionally, there is a 45% probability of sunny days during this period.
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Chance of sun
In August, the UV Index in Grand Rapids reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 1 | 2 | 4 | 6 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||