Cambridge Weather Summary September 2026 Based on 23 days' worth of half-hourly data recorded with rooftop sensors at the Computer Laboratory, Cambridge, U.K. Temperature (degrees C) Average: 16.1 Minimum: 5.6 (21 September 04:00) Maximum: 26.5 (06 September 15:00) Relative Humidity (%) Average: 86.0 Minimum: 86 (01 September 00:00) Maximum: 86 (01 September 00:00) Dew Point (degrees C) Average: 13.8 Minimum: 3.4 (21 September 04:00) Maximum: 23.9 (06 September 15:00) Atmospheric Pressure (mbar) Average: 1000.0 Minimum: 1000 (01 September 00:00) Maximum: 1000 (01 September 00:00) Half-hourly Instantaneous Wind Speed (knots) Average: 0.0 Minimum: 0.0 (01 September 00:00) Maximum: 0.0 (01 September 00:00) Half-hourly Maximum Wind Speed (knots) Average: 0.0 Minimum: 0 (01 September 00:00) Maximum: 0 (01 September 00:00) Prevalent Wind Direction N (100.0% of readings) Total Sunshine Hours 0.0 Total Rainfall mm 16.3