Daily Report for 12th August 2026

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 16.1 °C (+1.8) 06:21 14.6 °C (+0.2) 21.1 °C (+6.8), 2020 11.9 °C (-2.4), 2019
Maximum Temperature 32.4 °C (+9.6) 16:31 28.1 °C (+5.1) 33.9 °C (+11.1), 2020 18.8 °C (-4.0), 2019
Mean Temperature 23.9 °C (+5.7) 21.6 °C (+2.7) 26.5 °C, 2020 15.2 °C, 2019
Minimum Humidity 28% 14:48 32% 72%, 2021 28%, 2026
Maximum Humidity 84% 05:30 78% 93%, 2024 73%, 2013
Mean Humidity 55% 54% 86%, 2009 53%, 2022
Minimum Pressure 1023 hPa 17:35 1017 hPa 1023 hPa, 2026 1005 hPa, 2014
Maximum Pressure 1026 hPa 00:00 1022 hPa 1026 hPa, 2026 1009 hPa, 2014
Mean Pressure 1025 hPa 1019 hPa 1025 hPa, 2026 1007 hPa, 2014
Mean Wind Speed 3.4 mph (-0.6) 4.1 mph (+0.1) 8.3 mph, 2016 1.7 mph, 2019
Maximum Wind Speed 9.1 mph 11:00 12.9 mph 20.6 mph, 2016 9.1 mph, 2026
Maximum Gust 13.8 mph 10:29 19.4 mph 37.1 mph, 2016 12.8 mph, 2011
Mean Wind Direction ESE
Rainfall 0.0 mm 0.0 mm (0%) 4.0 mm, 2019
Maximum Hourly Rain n/a 3.7, 2019
Maximum 10-min Rain n/a 3.3, 2019
Maximum Rain Rate n/a 40, 2019
Minimum Dew Point 10.6 °C 14:48 8.7 °C 17.6 °C, 2020 4.2 °C, 2013
Maximum Dew Point 14.7 °C 07:43 14.0 °C 24.2 °C, 2024 11.2 °C, 2014
Mean Dew Point 13.0 °C 11.2 °C 19.7 °C, 2024 7.6 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 16.1 °C 06:21 14.8 °C 21.1 °C, 2020 12.4 °C, 2014
Day Maximum (09-21) 32.4 °C 16:31 28.1 °C 33.9 °C, 2020 18.8 °C, 2019
Max 10m Temp Rise 0.7 °C 07:14 0.9 °C 0.9 °C, 2013 0.4 °C, 2009
Max 1hr Temp Rise 3.2 °C 07:45 3.4 °C 3.2 °C, 2026 1.2 °C, 2010
Max 1hr Hum Rise 6% 22:48 11% 15%, 2018 4%, 2017
Max 10m Temp Fall 0.7 °C 19:11 0.8 °C 1.1 °C, 2014 0.3 °C, 2015
Max 1hr Temp Fall 2.5 °C 19:26 2.6 °C 2.8 °C, 2016 1.0 °C, 2009
Max 1hr Hum Fall 14% 08:04 14% 16%, 2018 6%, 2009
Max 10m Wind Speed 6.3 mph 10:14 9.2 mph 15.6 mph, 2016 6.3 mph, 2026
Minimum Feels-like 19.0 °C 06:25 16.0 °C 27.2 °C, 2020 13.0 °C, 2019
Maximum Feels-like 35.5 °C 16:28 30.4 °C 44.5 °C, 2024 20.1 °C, 2014
Mean Feels-like 26.8 °C 23.6 °C 33.4 °C, 2020 16.5 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Minimum PM2.5 3 11:50 2 3, 2026 0, 2021
Maximum PM2.5 9 23:00 12 9, 2026 9, 2026
Mean PM2.5 5 5 5, 2026 5, 2026
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 16.3 °C (+7.9) 13.5 °C (+4.9) 16.3 °C (+7.9), 2026 4.9 °C (-3.5), 2021
Humidity Range 56% 45% 56%, 2026 18%, 2021
Pressure Range 3 hPa 5 hPa 10 hPa, 2018 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 13.4 [99%]141 hrs (190%) [86%] 13.5 [100%], 2016 0.4 [3%], 2018
Wet Hours 00 hrs (0%) [0%] 4, 2015 0, 2011
Cloud Cover unknown
Events Maximum possible sunshine
Comments data is awaiting quality control from site operator
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 22.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 12th August 2026.
Times of extremes are computed using the midpoint of the longest continuous period at that extreme value.
Cumulative anomalies are reported according to the expected value for the month-to-date rather than month-end.
Sun hrs are derived based on analysis of webcam observations, but may use data from our closest site, Heathrow, when needed.
Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually.
Rainfall totals may be manually adjusted after the fact to correct delayed or erroneous data.
Cloud cover and Events are manually reported, often with multi-week delays.
Data is generally reliable and accurate but should always be viewed with some quantity of salt to hand.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose