Last updated: August 27, 2025
In July, the average temperature in Harwell, United Kingdom hovers around 18°C (65°F), with a range that can dip to a chilly 7°C (45°F) or soar to a warm 35°C (95°F). Expect about 63 mm (2.5 in) of precipitation spread over 12 days, contributing to an average humidity of 71%. Whether you're enjoying mild afternoons or preparing for unexpected showers, it's a month that blends variety and charm!
In July in Harwell, the average temperature is 18°C (65°F). Maximums can reach 35°C (95°F), while minimums can be as low as 7°C (45°F). It's a great time to explore Harwell, so pack accordingly for both warm days and cooler evenings.
In Harwell in July, the total precipitation amount reaches 63 mm (2.5 in) over the course of 12 days.
In Harwell in July humidity is 71%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making it a bit sticky and muggy, which can be slightly uncomfortable for traveling, especially if you're engaging in outdoor activities or exploring the city on foot.
In Harwell in July, 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 Harwell.
UV Risk Categories
Weather in Harwell varies notably across the year, with each month offering distinct climate conditions. This page compares July’s weather to other months in Harwell, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (41°F) | 50 mm (2.0 inches) | 91% | low |
| February Weather | 6°C (43°F) | 53 mm (2.1 inches) | 89% | low |
| March Weather | 7°C (45°F) | 59 mm (2.3 inches) | 86% | moderate |
| April Weather | 9°C (49°F) | 38 mm (1.5 inches) | 85% | high |
| May Weather | 12°C (55°F) | 69 mm (2.7 inches) | 79% | high |
| June Weather | 16°C (61°F) | 75 mm (3.0 inches) | 80% | very high |
| July Weather | 18°C (65°F) | 63 mm (2.5 inches) | 71% | very high |
| August Weather | 17°C (63°F) | 71 mm (2.8 inches) | 76% | high |
| September Weather | 15°C (59°F) | 50 mm (2.0 inches) | 82% | high |
| October Weather | 11°C (53°F) | 97 mm (3.8 inches) | 90% | moderate |
| November Weather | 8°C (46°F) | 56 mm (2.2 inches) | 92% | low |
| December Weather | 6°C (43°F) | 84 mm (3.3 inches) | 92% | low |