Last updated: June 24, 2025
In September, the average temperature in Frontenac, United States hovers around 23°C (74°F). Expect minimums dipping to 7°C (45°F) and maximums soaring to 35°C (95°F). Rain is a possibility, with 90 mm (3.5 in) of precipitation spread over 6 days. The atmosphere is comfortably humid, boasting an average humidity of 64%.
In September in Frontenac, the average temperature is 23°C (74°F). The maximum can reach 35°C (95°F), and the minimum can be as low as 7°C (45°F). This diverse temperature range makes Frontenac an ideal destination for travelers seeking to enjoy both warm days and cool evenings.
In Frontenac in September, the total precipitation amount reaches 90 mm (3.5 in) over the course of 6 days.
In Frontenac in September, humidity is 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while traveling.
In Frontenac in September, 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 Frontenac.
UV Risk Categories
Weather in Frontenac varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Frontenac, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 2°C (36°F) | 66 mm (2.6 inches) | 81% | moderate |
February Weather | 3°C (38°F) | 62 mm (2.4 inches) | 78% | moderate |
March Weather | 10°C (50°F) | 126 mm (5.0 inches) | 76% | high |
April Weather | 14°C (57°F) | 129 mm (5.1 inches) | 78% | very high |
May Weather | 20°C (68°F) | 199 mm (7.8 inches) | 83% | very high |
June Weather | 25°C (78°F) | 100 mm (4.0 inches) | 83% | extreme |
July Weather | 27°C (81°F) | 103 mm (4.0 inches) | 78% | extreme |
August Weather | 26°C (79°F) | 121 mm (4.8 inches) | 68% | very high |
September Weather | 23°C (74°F) | 90 mm (3.5 inches) | 64% | very high |
October Weather | 15°C (60°F) | 119 mm (4.7 inches) | 70% | high |
November Weather | 8°C (47°F) | 51 mm (2.0 inches) | 83% | moderate |
December Weather | 5°C (42°F) | 38 mm (1.5 inches) | 87% | moderate |