Last updated: June 24, 2025
In St Johnsbury, United States, the average temperature in August is a comfortable 19°C (67°F). However, temperatures can vary significantly, with minimums as low as 4°C (39°F) and maximums reaching 33°C (91°F). Visitors can expect some rainfall, with 88 mm (3.5 in) of precipitation spread over 13 days. The average humidity during this time is 74%, contributing to a vibrant and lush environment.
In August in St Johnsbury, the average temperature is 19°C (67°F). Maximum can reach 33°C (91°F) and minimum can be as low as 4°C (39°F). This climate makes St Johnsbury an ideal destination for travelers seeking mild weather and a variety of outdoor activities.
In St Johnsbury in August, the precipitation amount is 88 mm (3.5 in) spread over 13 days.
In St Johnsbury in August, humidity is 74%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel stifling, often leading travelers to seek shade and hydrate frequently.
In St Johnsbury 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 St Johnsbury.
UV Risk Categories
Weather in St Johnsbury varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in St Johnsbury, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 80 mm (3.1 inches) | 91% | low |
| February Weather | -6°C (21°F) | 78 mm (3.1 inches) | 89% | moderate |
| March Weather | -2°C (29°F) | 69 mm (2.7 inches) | 85% | moderate |
| April Weather | 5°C (42°F) | 110 mm (4.3 inches) | 84% | very high |
| May Weather | 12°C (55°F) | 95 mm (3.7 inches) | 78% | very high |
| June Weather | 17°C (63°F) | 98 mm (3.9 inches) | 72% | very high |
| July Weather | 20°C (69°F) | 106 mm (4.2 inches) | 75% | very high |
| August Weather | 19°C (67°F) | 88 mm (3.5 inches) | 74% | very high |
| September Weather | 15°C (60°F) | 64 mm (2.5 inches) | 77% | high |
| October Weather | 9°C (48°F) | 138 mm (5.5 inches) | 85% | moderate |
| November Weather | 0°C (33°F) | 103 mm (4.0 inches) | 86% | moderate |
| December Weather | -5°C (23°F) | 85 mm (3.3 inches) | 85% | low |