Updated: 2026-07-31
In the week from 18 July 1989 to 24 July 1989, the average daily maximum temperature at the Met Office station closest to Manchester reached 22.7°C. That is the highest weekly mean maximum on record for the area.
That week stands as the warmest seven-day stretch in the entire period from 1977-01-02 to 1995-06-01 at the Holme Moss station in West Yorkshire, located 26.1 km from Manchester at an altitude of 520 metres. No other week in that 18-year window came close to matching the sustained heat of mid-July 1989.
To be precise: the point of measurement nearest to Manchester is the Holme Moss station (West Yorkshire), 520 metres above sea level. The real climate of Manchester itself can differ from what is recorded here — different altitude, local valley effects, proximity to the Pennines. But for a historical answer, this is the closest official reading we have, direct from the Met Office archive.
What made that week special was not a single scorching day, but the persistence of warmth. Day after day, afternoon highs stayed high enough that the seven-day average peaked at 22.7°C. For comparison, the typical July at Holme Moss sees a mean maximum of just 16.3°C — the week in 1989 ran more than six degrees above the normal July warmth.
A single hot day can be a fluke. A week of consistent heat tells you something about the air mass sitting over the region. At Holme Moss, 1989 delivered a sustained spell that has not been beaten in the entire analysed record. The event remains the benchmark for summer heat in this corner of northern England.
Working from the official Met Office MIDAS daily records, each day's maximum temperature was taken and the series was grouped into consecutive seven-day windows. The average of each window was then computed, and the single highest weekly mean was selected. This is not a model — it is arithmetic applied directly to the measured daily values.
The table below shows the average daily maximum and mean temperature for each month across the whole period of record. It gives a sense of how exceptional a weekly average of 22.7°C was for this upland station.
| Month | Avg Daily Max (°C) | Avg Daily Mean (°C) |
|---|---|---|
| January | 3.2 | 1.1 |
| February | 3.7 | 1.5 |
| March | 5.2 | 2.7 |
| April | 7.6 | 4.7 |
| May | 11.7 | 8.1 |
| June | 14.0 | 10.6 |
| July | 16.3 | 13.0 |
| August | 15.5 | 12.4 |
| September | 12.9 | 10.1 |
| October | 9.5 | 7.1 |
| November | 5.9 | 3.8 |
| December | 4.8 | 2.7 |
The contrast is stark. July's usual maximum of 16.3°C already reflects a cool upland site. To hold a weekly average of 22.7°C, every single day in that week had to deliver well above the seasonal norm. That is not a brief spike — it is a whole week of exceptional heat, sustained over seven days.
For residents of Manchester planning outdoor events, the lesson from the historical record is clear: if you want the best odds of warm weather, late July is historically the window that delivered the area's single most intense warm spell on record. But even then, a repeat of 1989 is not something to count on — that week stands alone in the data.
These figures come directly from the Met Office MIDAS archive, the national meteorological service's official dataset held at the Centre for Environmental Data Analysis. The Holme Moss station has been reporting consistently since the late 1970s, and the data is quality-controlled. The reading of 22.7°C as the weekly mean maximum is the literal result of averaging the daily maxima recorded between 18 and 24 July 1989.
One note of caution for anyone trying to extrapolate to the city itself: Holme Moss sits at 520 metres elevation. Manchester city centre is lower and more sheltered, so its actual temperatures may run somewhat warmer in summer. The station remains, however, the nearest official long-term measurement point, and its records are the most honest answer available for what happened historically in the region.
The 1989 heat week has never been matched in the 18 years of continuous data from this station. It is the defining summer event of the period — a week when the Pennine hills above Manchester were as warm as they have ever been measured to be.
Source: Met Office MIDAS archive — Holme Moss station, West Yorkshire. Period analysed: 1977–1995.
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