Hour-by-hour forecast for Sheffield as two-day-long 34C heatwave arrives in South Yorkshire
Wednesday has a partial solar eclipse and Thursday is A-Level Results Day - two busy events in 33C+ heat
Here is an hour by hour forecast for Sheffield ahead of two days of 33C+ heat in South Yorkshire.
An amber weather warning for extreme heat has been issued for large parts of England this week, with temperature set to peak at 34C in Sheffield this Thursday (August 13).
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However, even before then, today is also set to reach 33C, marking another two days of extreme heat in the city and the fifth UK heatwave of 2026.
It raises the risk to harm to vulnerable people’s health, as well as strain on healthcare services, tram disruptions, traffic jams and train delays.
Other hazards like larger gatherings at bodies of water increasing the chance of drownings.
It comes as Wednesday will see large outside gatherings for the partial solar eclipse in the evening, while Thursday is A-Levels Results Day 2026 and is likely to see hundreds of Sheffield’s young people out celebrating their grades.
To help stay safe, here is an hour-by-hour forecast using information from the Met Office of when it will be hottest this week.
Hour-by-hour weather forecast for Sheffield on August 12-13, 2026
Wednesday, August 11, 2026 - max temp 32C
6am - 9am: Cool start with practically no wind, rising from 14C to 19C by 9am.
9am - 12noon: Temperatures rapidly rising from 19C to 27C by midday. No wind.
12noon - 3pm: Rising and rising to 31C as late afternoon approaches. Experts warn against exercising or strenuous activity in this period.
3pm - 6pm: Heat should plateau at 32C by 6pm. Gentle wind arriving just in time for partial solar eclipse.
6pm - 8pm, partial solar eclipse: It will be a very warm summer evening in time for the partial solar eclipse in Sheffield, hovering at around 32C - although the Met Office forecast does not account if the moon passing in front of the sun will lower temperatures!
9pm - overnight: A very warm night ahead, averaging around 25C, reaching lows of 20C by 6am.
Thursday, August 12, 2026 - max temp 33C - amber heat warning
6am - 9am: Already off to a hot start, with the amber health warning in place from 9am onwards. Heating up from 19C to 26C by 9am.
9am - 11am: Rising and rising to 30C, and with little to no wind.
11am - 3pm: Experts warn not to exercise or remain exposed from 11am until 3pm when the sun is at its strongest. Rising to highs of 33C. Gentle breeze.
3pm - 6pm: Hot afternoon hovering at 33C. Breeze rising by 6pm to cut through heat, bringing it down to 32C.
6pm - 9pm: Heat could begin to break, but still as high as 25C by 9pm. This is when the amber weather warning for extreme heat ends.
9pm - overnight: A bit cooler, dropping to 19C overnight. A cooler few days and weekend are in store afterwards, dipping down to 22C by Saturday and Monday.