Last updated: June 24, 2025
In September, the average temperature in Watertown, United States hovers around 19°C (67°F). You can expect a minimum chill of 5°C (41°F) and heat peaks reaching up to 34°C (93°F). With an average precipitation of 105 mm (4.1 in) spread across 9 days, the air carries a humidity level of 68%. Prepare for a mix of weather as you enjoy this vibrant locale!
In September in Watertown, the average temperature is 19°C (67°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 5°C (41°F). This varied climate makes Watertown an ideal destination for travelers looking to experience both warm and cooler weather.
In Watertown in September, the total precipitation amount reaches 105 mm (4.1 in) over the course of 9 days.
In Watertown in September, humidity is 68%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket, making travel pleasant yet slightly muggy, which can be refreshing while exploring but may require occasional breaks to stay comfortable.
In Watertown in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Watertown.
UV Risk Categories
Weather in Watertown varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Watertown, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 0°C (32°F) | 69 mm (2.7 inches) | 84% | moderate |
February Weather | 1°C (34°F) | 93 mm (3.7 inches) | 82% | moderate |
March Weather | 4°C (39°F) | 91 mm (3.6 inches) | 81% | high |
April Weather | 9°C (49°F) | 130 mm (5.1 inches) | 78% | very high |
May Weather | 15°C (60°F) | 110 mm (4.3 inches) | 69% | very high |
June Weather | 20°C (69°F) | 99 mm (3.9 inches) | 69% | very high |
July Weather | 24°C (75°F) | 143 mm (5.6 inches) | 62% | very high |
August Weather | 23°C (74°F) | 94 mm (3.7 inches) | 65% | very high |
September Weather | 19°C (67°F) | 105 mm (4.1 inches) | 68% | very high |
October Weather | 14°C (57°F) | 138 mm (5.4 inches) | 74% | high |
November Weather | 6°C (44°F) | 93 mm (3.7 inches) | 82% | moderate |
December Weather | 2°C (36°F) | 124 mm (4.9 inches) | 80% | low |