June 2025 brought warmer than average conditions to South Holland, with temperatures running slightly above the seasonal norm. The month delivered a mixed weather pattern, combining warmth with above-average rainfall and slightly enhanced sunshine.
Temperature Overview
The province experienced an average temperature of 18.0 degrees Celsius, which is 0.6 degrees above the normal value of 17.4 degrees. This modest warming trend was consistent throughout the month. The coldest day occurred on June 11 in Gouda, where temperatures dropped to 8.6 degrees Celsius, while the warmest conditions were recorded in Vlaardingen on June 21, reaching 32.0 degrees Celsius. This 23.4-degree difference between the coldest and warmest days illustrates the considerable temperature variability experienced during the month.
Precipitation Patterns
Rainfall was notably above normal, with an average total of 62.3 millimeters compared to the seasonal normal of 51.2 millimeters, representing a 22 percent increase. The wettest day occurred on June 5 in Vlaardingen, where 19.9 millimeters of rain fell. Vlaardingen also recorded the highest monthly precipitation total across the province, accumulating 75.5 millimeters, indicating that coastal areas experienced particularly wet conditions during this period.
Sunshine and Extremes
Despite the above-average rainfall, sunshine hours were also elevated. The province received 400.8 hours of sunshine, exceeding the normal value of 380.5 hours by approximately 5 percent. This combination of increased rainfall and sunshine suggests a pattern of frequent but relatively brief rain showers interspersed with sunny periods, typical of early summer weather systems in the Netherlands.
Overall, June 2025 in South Holland was characterized by mild temperatures, wet conditions, and reasonable sunshine, creating conditions favorable for vegetation growth while requiring attention to water management in this low-lying province.