September 2025 Weather Report: Noord-Holland, Netherlands
September brought cooler and wetter conditions to Noord-Holland compared to historical averages. The month was characterized by below-normal temperatures and above-average precipitation, creating a distinctly autumnal atmosphere across the province.
Temperature Overview
The average temperature for September 2025 in Noord-Holland reached 15.3 degrees Celsius, which is 1.2 degrees below the normal value of 16.5 degrees. This cooler-than-average month saw significant temperature variation across the region. The warmest day occurred on September 7 in Edam-Volendam, where temperatures climbed to 25.9 degrees Celsius, providing a brief taste of late summer warmth. In contrast, the coldest conditions were recorded in Hoorn on September 10, with a minimum temperature of just 6.5 degrees Celsius, marking the onset of autumn's chill.
Precipitation Patterns
Rainfall was notably above normal throughout the month. The province received an average total of 91.6 millimeters, representing a 7 percent increase compared to the normal precipitation of 85.3 millimeters. The wettest day occurred on September 12 in Alkmaar, where 32.3 millimeters of rain fell. Alkmaar emerged as the wettest location overall, accumulating 156.9 millimeters of precipitation during the entire month, significantly exceeding typical September values.
Sunshine and Notable Conditions
Sunshine hours totaled 274.6 hours across the province, slightly below the normal value of 281.0 hours, representing a 2 percent deficit. This reduction in sunshine, combined with increased cloud cover and precipitation, contributed to the cooler and damper character of the month. The combination of below-average temperatures, above-average rainfall, and reduced sunshine hours created typical autumn weather patterns for Noord-Holland during September 2025.