Updated: 2026-08-13
When we talk about "extreme heat" in the UK context, we're looking at days where the mercury climbs to at least 35°C. In Oxford, relying on the long-running Met Office station records from 1853 to 2026, the average number of such days per year has been 10.9 in the current decade (2020s). That's not a hypothetical figure – it's the measured reality from the national weather network.
Let's put that into human perspective. The 2020s, with an average of 10.9 hot days annually, has already surpassed every previous decade in the records. But extreme heat in Oxford isn't new – the summer of 1911 produced 23 days with temperatures above 35°C, as did 1995 and 2018. That means for the better part of a month in those specific years, Oxford was baking in conditions that most locals now associate with Mediterranean summers.
What surprises many people is that these extreme heat days aren't spread evenly across the year. Oxford's warmest months – typically July and August – account for the majority of these events. But looking historically, some autumn and even spring days have crossed the threshold, extending the "hot season" earlier and later than many expect.
When you look at the full picture from the 1850s through the current decade, a clear pattern emerges. The 1850s averaged 3.1 hot days per year. The 1860s followed with 3.0. But the 1940s jumped to 6.9 annually – a notable spike driven by wartime summers. Then something shifted: the 1960s dropped dramatically to just 1.3 hot days per year, the lowest of any decade in the series.
The turning point came in the 1990s with 6.2 days, followed by the 2000s at 6.8, the 2010s at 7.4, and now the 2020s standing at 10.9 days per year. That's the highest decade-average of the entire 173-year period – and the decades have never shown such sustained warmth before.
| Decade | Average Hot Days per Year |
|---|---|
| 1850s | 3.1 |
| 1860s | 3.0 |
| 1870s | 4.8 |
| 1880s | 2.1 |
| 1890s | 3.9 |
| 1900s | 3.2 |
| 1910s | 3.6 |
| 1920s | 4.3 |
| 1930s | 4.7 |
| 1940s | 6.9 |
| 1950s | 2.8 |
| 1960s | 1.3 |
| 1970s | 4.0 |
| 1980s | 3.7 |
| 1990s | 6.2 |
| 2000s | 6.8 |
| 2010s | 7.4 |
| 2020s | 10.9 |
Some years stand out as exceptional heat years, even in a city with such a long weather record. The summer of 1911 delivered 23 extreme heat days – that's nearly four full weeks of temperatures at or above 35°C. The peak that year reached 34.8°C. During the famous 1976 drought summer, Oxford logged 21 such days with a maximum of 34.3°C. Most recently, 2018 matched the historical maximum with 23 days of heat, though the hottest single reading that year stayed at 32.4°C.
On the flip side, some years saw almost no extreme heat at all. In 1853 – the first year of the station's records – Oxford recorded 0 days above 35°C, with the year's maximum temperature stopping at 26.1°C. Similarly, 1855, 1860, 1861, and 1862 each logged 0 extreme heat days. Those mid-19th-century summers now seem almost hard to believe.
While this page focuses on the frequency of extreme heat days rather than the highest temperatures ever seen, the absolute record for Oxford in the Met Office dataset is worth noting in context: on 20 July 2022, the station recorded 38.1°C, a temperature almost unheard of in the city's 170+ years of observations.
The table below shows the complete annual series for Oxford. Each row represents a year, with the total count of days where the maximum temperature reached at least 35°C. The five highest and five lowest years are highlighted in the data we've pulled from the Met Office archive.
| Year | Hot Days | Yearly Max Temp (°C) |
|---|---|---|
| 1911 | 23 | 34.8 |
| 1995 | 23 | 33.3 |
| 2018 | 23 | 32.4 |
| 1976 | 21 | 34.3 |
| 2006 | 18 | 34.8 |
| 1853 | 0 | 26.1 |
| 1855 | 0 | 27.7 |
| 1860 | 0 | 23.1 |
| 1861 | 0 | 27.7 |
| 1862 | 0 | 24.4 |
The annual data above captures both the historical extremes – with 23 hot days as the highest annual count recorded in 1911, 1995, and 2018 – and the quietest years when the 35°C threshold simply wasn't reached at all. What's striking when you trace the full curve from 1853 to today is the recent clustering of high-count years in the 1990s and thereafter, a pattern that aligns with what many households now feel: summers in Oxford have seen a measurable increase in the number of genuinely hot days, from a long-term pulse of around 3 to 4 per year in the Victorian era to a current average of 10.9.
So how often do heatwaves actually hit Oxford? The honest answer from the data is: it varies, but the trend is upward. In any given year, you might see anything from 0 to 23 days above 35°C, with the most recent decades stacking the odds in favour of more frequent heat. For residents planning summer events or checking their climate risk, the pragmatic reading is that heat days in Oxford are no longer the rare exception they were in the 19th century – they're a regular part of the season, occurring on about one out of every five summer days in the current decade.
These numbers come from the official Met Office station records for Oxford, covering the period from 1853 through 30 June 2026. The complete daily series, consolidated from the Met Office's national network, offers anyone who wants it the ability to check any specific year, month, or even individual day in the city's weather history. It's a rich record that keeps growing – and worth keeping an eye on.
Source: Met Office – Oxford station, period 1853–2026.
Understanding the frequency of extreme heat days in Oxford is more than a historical curiosity – it's a practical tool for planning and adaptation. For policymakers, public health officials, and residents alike, knowing that the 2020s are averaging 10.9 hot days per year – a figure nearly triple the long-term average of the 1850s and 1860s – informs everything from building design to emergency heat protocols. The data also serves as a benchmark for tracking future changes in the coming decades.
The record from 1853 to 2026 tells a consistent story: extreme heat days in Oxford have become more frequent, especially since the 1990s. The highest annual counts – 23 days in 1911, 1995, and 2018 – were once outliers, but the current decade is turning such figures into the new normal. While individual years vary widely, the overall direction is unambiguous. For anyone living in or visiting Oxford, the practical takeaway is this: hot days are now a regular feature of the summer, and that pattern is likely to continue.
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© 2026 HistoClima · data: Met Office (OGL v3.0) · not affiliated with Met Office · citation permitted with source.