July 2025 brought warmer than average conditions to South Holland, with temperatures running slightly above the long-term normal. The month was characterized by above-average sunshine and below-average rainfall, creating a relatively dry summer period across the province.
Temperature Overview
The average temperature for July in South Holland reached 18.8 degrees Celsius, which is 0.7 degrees above the normal value of 18.1 degrees. The warmest conditions were recorded in Vlaardingen on July 1st, where the thermometer climbed to 36.7 degrees Celsius. In contrast, the coldest reading of the month occurred in Waddinxveen on July 4th, with a minimum of 11.1 degrees Celsius, demonstrating the considerable temperature variation that can occur within the province during summer months.
Precipitation Patterns
Rainfall during July was notably below normal, with the province receiving an average of 91.8 millimeters compared to the typical 111.5 millimeters. This represents an 18 percent deficit from the expected monthly precipitation. The wettest day occurred in Zuidplas on July 6th, when 35.2 millimeters of rain fell. Goeree-Overflakkee emerged as the wettest location for the month, accumulating a total of 105.2 millimeters of precipitation.
Sunshine and Extremes
One of the most notable features of July 2025 was the exceptional sunshine, with 399.1 hours recorded across South Holland. This represents a 10 percent increase above the normal value of 363.3 hours, indicating a particularly bright and sunny month. The combination of above-average temperatures, abundant sunshine, and below-average rainfall created favorable conditions for outdoor activities throughout the province during this summer period.