September 2025 Weather Report: Groningen Province
September in Groningen proved to be a cooler and wetter than average month, with temperatures running slightly below normal and precipitation significantly exceeding seasonal expectations. The province experienced typical autumn weather patterns, with a gradual cooling trend as the month progressed and frequent rainfall events contributing to above-normal moisture levels.
Temperature Overview
The average temperature for September in Groningen reached 15.0 degrees Celsius, falling 1.1 degrees below the normal value of 16.1 degrees. The warmest day of the month occurred on September 7th in Groningen city, where temperatures climbed to 24.8 degrees Celsius, providing a pleasant early-month warmth. In contrast, the coldest reading was recorded in Stadskanaal on September 24th, dropping to just 5.6 degrees Celsius, marking a significant temperature swing of nearly 20 degrees between the month's extremes.
Precipitation Patterns
Rainfall was notably abundant throughout the month, with an average total of 77.2 millimeters across the province, representing a 19 percent increase above the normal September precipitation of 64.7 millimeters. The wettest single day occurred on September 16th in Eemsdelta, where 18.5 millimeters fell. Over the entire month, Eemsdelta emerged as the wettest location in the province, accumulating 91.6 millimeters of precipitation, substantially exceeding the provincial average.
Sunshine and Notable Observations
Sunshine hours totaled 272.4 hours for the month, representing a 4 percent decrease from the normal value of 283.2 hours. This modest reduction in sunshine, combined with the elevated precipitation and below-normal temperatures, created typical autumn conditions characteristic of the season in northern Netherlands. The combination of cooler temperatures, frequent rain, and slightly reduced sunshine hours defined September 2025 in Groningen as a notably wet and cool autumn month.