Last updated: June 24, 2025
In September, the average temperature in Delaware City, United States is a pleasant 22°C (72°F), with daily temperatures ranging from a cool 8°C (47°F) to a warm 34°C (93°F). Expect about 96 mm (3.8 in) of precipitation over 11 days, contributing to an average humidity level of 75%. Whether you’re seeking sunny days or the occasional shower, this month promises a unique blend of weather experiences!
In September in Delaware City, the average temperature is 22°C (72°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 8°C (47°F). This varied climate makes it an ideal destination for travelers seeking both warm and cooler weather experiences.
In Delaware City in September, the precipitation amount is 96 mm (3.8 in) spread over 11 days, resulting in a significant accumulation of rainfall.
In Delaware City in September, humidity is 75%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet requiring travelers to stay hydrated and take breaks in shaded areas.
In Delaware City 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 Delaware City.
UV Risk Categories
Weather in Delaware City varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Delaware City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (37°F) | 60 mm (2.4 inches) | 84% | moderate |
| February Weather | 4°C (40°F) | 98 mm (3.9 inches) | 83% | moderate |
| March Weather | 8°C (46°F) | 103 mm (4.1 inches) | 83% | high |
| April Weather | 13°C (56°F) | 100 mm (3.9 inches) | 81% | very high |
| May Weather | 18°C (65°F) | 131 mm (5.2 inches) | 78% | very high |
| June Weather | 24°C (75°F) | 108 mm (4.2 inches) | 79% | very high |
| July Weather | 27°C (80°F) | 135 mm (5.3 inches) | 74% | very high |
| August Weather | 25°C (78°F) | 151 mm (6.0 inches) | 72% | very high |
| September Weather | 22°C (72°F) | 96 mm (3.8 inches) | 75% | very high |
| October Weather | 17°C (62°F) | 111 mm (4.4 inches) | 81% | high |
| November Weather | 9°C (48°F) | 80 mm (3.2 inches) | 85% | moderate |
| December Weather | 5°C (41°F) | 97 mm (3.8 inches) | 84% | moderate |