Updated: 2026-07-31
The question of the September heat record for Manchester has a precise answer, but it comes with a crucial caveat about where exactly the measurement was taken. The point of measurement closest to Manchester is the Holme Moss station (province of West Yorkshire), situated at 520 m altitude, about 26.1 km away. These are its historical records:
The highest September maximum temperature ever recorded at Holme Moss station, the closest permanent measurement point to Manchester, was 21.5°C (degrees Celsius), reached on September 9, 1991.
That figure of 21.5°C stands as the absolute September record for this station across the entire period for which we have consolidated daily data. It is worth stressing that this measurement comes from an upland site: Holme Moss sits at 520 metres above sea level, which places it in a cooler climatic context than central Manchester, a city that lies lower and is subject to the urban heat island effect. The actual temperature experienced in Manchester city centre on that September afternoon in 1991 could well have been higher than what the station recorded, but the 21.5°C figure is the only verifiable measurement we hold from the closest official station.
To understand why this record matters, context is needed. September 1991 was a month when a late burst of summer warmth arrived with unusual intensity. The fact that the maximum temperature reached 21.5°C at a station located on high moorland terrain, which normally stays several degrees cooler than the surrounding lowlands, indicates the significance of that warm spell. If the hilltop site got that warm, the valleys and the city below would have been considerably more uncomfortable for anyone outdoors.
The climate station at Holme Moss provided continuous daily observations from 1977-01-02 through 1995-06-01. This is the full span of the record we are analysing. Within that window, the 21.5°C registered on September 9, 1991 remains the standout value for the month. No other September in that period produced a higher maximum temperature at this station.
One caveat should be stated clearly: the highest recorded value for September at Holme Moss does not necessarily represent the highest absolute temperature near Manchester in all years before or after that period. The record covers the specific years 1977 to 1995, the period for which consolidated daily data exist for this station. If there were earlier or later Septembers with exceptional heat, they would fall outside this dataset. However, within the 1977–1995 window, September 9, 1991 is the definitive maximum.
Meteorological records are often defined by a single day, and this one is no exception. The table below shows the one value that defines the September heat record for this station:
| Maximum temperature (°C) | Date |
|---|---|
| 21.5 | 1991-09-09 |
That single row is the answer to the question. A maximum of 21.5°C occurring on the ninth day of September 1991. For a station perched at 520 metres on the edge of the Pennines, exposed to the winds that sweep across the moorland, this is a notable figure. It represents one of those rare occasions when the synoptic pattern aligned to pull very warm air from the south or southwest over northern England, and the hilltop itself could not stay cool.
For residents of Manchester asking whether this September record will ever be beaten, the honest answer is that the statistics point to the resilience of this mark. The period covered here, 1977 to 1995, includes many Septembers that could have produced higher values, and none did. The very fact that a 21.5°C reading on a moorland station remains the top value in nineteen years of daily records is a testament to how exceptional that early-September day in 1991 was.
The temperature recorded at Holme Moss is not the temperature of Manchester. Anyone who has driven from the city centre up to the moorland knows the gradient well: as you climb away from the Mersey valley, the air cools, the wind strengthens, and a blue sky in town can turn to grey cloud on the hill. The station, at 520 m altitude and roughly 26.1 km from Manchester, sits in a completely different microclimate. A September day that brings 21.5°C to Holme Moss would typically deliver something warmer in central Manchester, though precisely how much warmer is not a figure this station's records can tell you.
If you are planning an outdoor event in Manchester in September and want to know whether the city could get as hot as it has ever been, the 21.5°C figure is your low-end benchmark. The city itself, shielded from the worst of the upland winds and benefiting from the built-up environment that retains heat, is likely to have seen at least that value on September 9, 1991, and possibly a touch more. But for a rigorous, verifiable, officially recorded maximum, the number to cite is 21.5°C, with the date 1991-09-09 attached to it.
Records like this one are the building blocks of climate analysis. A single extreme value, kept carefully in the archives, gives us a fixed point that later years can be compared against. The fact that the September record at Holme Moss dates back to 1991, near the start of the station's full data coverage, is itself a statement: in the years that followed, with all the talk of warming autumns, no September at this station managed to push ahead of that 21.5°C reading. That is not a claim that climate change is absent; it is simply a fact about this particular station's record, within this particular window of years.
The data cited here come directly from the Met Office MIDAS archive, the United Kingdom's official national weather station network. The specific instrument that recorded the 21.5°C value sat at the Holme Moss station, in the province of West Yorkshire, at 520 metres above sea level. The full period examined runs from 1977-01-02 to 1995-06-01, and within that period, no other September produced a hotter day.
If someone asks you what the September heat record is near Manchester, the answer is very short. On September 9, 1991, the Holme Moss weather station, the closest official measurement point to the city, recorded a maximum temperature of 21.5°C. That is the warmest September day in the station's 1977-to-1995 record. It has stood unchallenged through every subsequent September in that period.
When you hear about warm autumn days in Manchester, compare them against that measurement. A September afternoon that pushes the Holme Moss station past 21.5°C would be breaking new ground in the official record. Until that happens, the record belongs to the ninth of September, 1991, and to the exceptional blast of warm air that lifted an exposed moorland station to 21.5°C.
Source: Met Office, official data from the MIDAS archive. Station: Holme Moss. Period: 1977–1995.
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