Last updated: June 24, 2025
In New Castle Northwest, United States, the average temperature in September hovers around 19°C (66°F), offering a pleasant climate. Expect daytime highs to reach a warm 33°C (92°F) while nights could dip to a cool 3°C (38°F). With 115 mm (4.5 in) of precipitation spread over 10 days, it's advisable to keep an umbrella handy. The average humidity of 77% adds a touch of tropical warmth to your experience!
In September in New Castle Northwest, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (92°F), while minimums can dip as low as 3°C (38°F). This variety in weather makes New Castle Northwest an ideal destination for travelers seeking both warm and cool experiences.
In New Castle Northwest in September, the precipitation amount is 115 mm (4.5 in) over a span of 10 days.
In New Castle Northwest in September, humidity is 77%. With an average temperature of 19°C (66°F), this humidity feels like a heavy blanket wrapping around you, making the air feel thick and sticky, which can be quite uncomfortable for traveling.
In New Castle Northwest 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 New Castle Northwest.
UV Risk Categories
Weather in New Castle Northwest varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in New Castle Northwest, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 98 mm (3.9 inches) | 88% | moderate |
| February Weather | 0°C (33°F) | 111 mm (4.4 inches) | 88% | moderate |
| March Weather | 4°C (40°F) | 108 mm (4.3 inches) | 87% | high |
| April Weather | 10°C (50°F) | 139 mm (5.5 inches) | 87% | very high |
| May Weather | 16°C (61°F) | 141 mm (5.6 inches) | 81% | very high |
| June Weather | 20°C (69°F) | 138 mm (5.4 inches) | 83% | very high |
| July Weather | 23°C (74°F) | 141 mm (5.5 inches) | 82% | very high |
| August Weather | 22°C (72°F) | 99 mm (3.9 inches) | 76% | very high |
| September Weather | 19°C (66°F) | 115 mm (4.5 inches) | 77% | very high |
| October Weather | 13°C (56°F) | 125 mm (4.9 inches) | 82% | high |
| November Weather | 5°C (41°F) | 103 mm (4.0 inches) | 89% | moderate |
| December Weather | 1°C (35°F) | 103 mm (4.0 inches) | 86% | low |