Last updated: August 27, 2025
In September, the average temperature in Castleside, United Kingdom hovers around 12°C (54°F). Temperatures can range from a cool 2°C (36°F) to a warm 26°C (78°F). Expect around 75 mm (2.9 in) of precipitation over 14 days, contributing to a notably high average humidity of 87%. Be prepared for a mix of conditions as you explore!
In September in Castleside, the average temperature is 12°C (54°F). The maximum can reach 26°C (78°F), and the minimum can be as low as 2°C (36°F). When planning your visit, be prepared for a range of temperatures, making layering essential for your comfort while exploring.
In Castleside in September, the total precipitation amount is 75 mm (2.9 in) accumulated over a period of 14 days.
In Castleside in September humidity is 87%. With an average temperature of 12°C (54°F), this humidity feels like a damp embrace, making it quite uncomfortable for traveling, as the air feels heavy and can quickly sap your energy as you explore the sights.
In Castleside in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Castleside.
UV Risk Categories
Weather in Castleside varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Castleside, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 61 mm (2.4 inches) | 89% | low |
| February Weather | 4°C (39°F) | 97 mm (3.8 inches) | 87% | low |
| March Weather | 5°C (42°F) | 87 mm (3.4 inches) | 85% | moderate |
| April Weather | 7°C (45°F) | 43 mm (1.7 inches) | 84% | moderate |
| May Weather | 10°C (51°F) | 68 mm (2.7 inches) | 83% | high |
| June Weather | 13°C (56°F) | 93 mm (3.6 inches) | 85% | very high |
| July Weather | 15°C (59°F) | 88 mm (3.5 inches) | 83% | very high |
| August Weather | 15°C (58°F) | 96 mm (3.8 inches) | 82% | high |
| September Weather | 12°C (54°F) | 75 mm (2.9 inches) | 87% | moderate |
| October Weather | 9°C (49°F) | 99 mm (3.9 inches) | 89% | moderate |
| November Weather | 6°C (43°F) | 72 mm (2.8 inches) | 90% | low |
| December Weather | 4°C (40°F) | 83 mm (3.2 inches) | 88% | low |