Daily Report for 11th August 2026

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.8 °C (+0.4) 06:05 14.5 °C (+0.1) 20.2 °C (+5.8), 2020 8.0 °C (-6.4), 2018
Maximum Temperature 25.1 °C (+2.3) 14:45 27.8 °C (+4.7) 33.4 °C (+10.6), 2020 20.7 °C (-2.1), 2014
Mean Temperature 20.3 °C (+1.4) 21.4 °C (+2.4) 26.9 °C, 2020 15.8 °C, 2018
Minimum Humidity 41% 17:23 33% 67%, 2011 34%, 2022
Maximum Humidity 81% 06:36 77% 97%, 2010 74%, 2013
Mean Humidity 63% 54% 78%, 2011 55%, 2013
Minimum Pressure 1025 hPa 00:02 1016 hPa 1025 hPa, 2026 1004 hPa, 2014
Maximum Pressure 1027 hPa 11:27 1021 hPa 1028 hPa, 2025 1009 hPa, 2014
Mean Pressure 1026 hPa 1019 hPa 1026 hPa, 2026 1007 hPa, 2014
Mean Wind Speed 5.4 mph (+1.4) 4.2 mph (+0.2) 8.1 mph, 2019 0.8 mph, 2015
Maximum Wind Speed 13.7 mph 13:10 13.3 mph 19.4 mph, 2016 5.9 mph, 2015
Maximum Gust 19.6 mph 10:19 19.9 mph 30.0 mph, 2019 7.8 mph, 2015
Mean Wind Direction SE
Rainfall 0.0 mm 0.0 mm (0%) 7.3 mm, 2014
Maximum Hourly Rain n/a 5.6, 2014
Maximum 10-min Rain n/a 3, 2014
Maximum Rain Rate n/a 90, 2014
Minimum Dew Point 9.7 °C 17:52 8.5 °C 17.5 °C, 2020 5.7 °C, 2013
Maximum Dew Point 14.4 °C 09:41 13.9 °C 20.6 °C, 2020 13.0 °C, 2017
Mean Dew Point 12.6 °C 11.1 °C 18.8 °C, 2020 9.1 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.8 °C 06:05 14.6 °C 20.2 °C, 2020 8.0 °C, 2018
Day Maximum (09-21) 25.1 °C 15:03 27.8 °C 33.4 °C, 2020 20.7 °C, 2014
Max 10m Temp Rise 0.7 °C 10:57 0.9 °C 1.2 °C, 2020 0.4 °C, 2011
Max 1hr Temp Rise 2.8 °C 07:43 3.4 °C 4.8 °C, 2025 1.5 °C, 2011
Max 1hr Hum Rise 10% 18:50 12% 22%, 2014 6%, 2011
Max 10m Temp Fall 0.5 °C 17:55 0.8 °C 2.3 °C, 2014 0.3 °C, 2012
Max 1hr Temp Fall 1.6 °C 20:09 2.7 °C 4.9 °C, 2014 1.0 °C, 2016
Max 1hr Hum Fall 8% 09:12 14% 19%, 2012 7%, 2015
Max 10m Wind Speed 10.1 mph 17:56 9.5 mph 14.8 mph, 2016 3.7 mph, 2015
Minimum Feels-like 16.7 °C 05:56 15.7 °C 25.9 °C, 2020 6.5 °C, 2018
Maximum Feels-like 28.1 °C 14:39 29.9 °C 40.8 °C, 2020 21.6 °C, 2014
Mean Feels-like 22.9 °C 23.4 °C 33.5 °C, 2020 17.3 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Minimum PM2.5 2 18:05 2 2, 2026 0, 2021
Maximum PM2.5 6 13:50 12 6, 2026 6, 2026
Mean PM2.5 4 5 4, 2026 4, 2026
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.3 °C (+1.8) 13.3 °C (+4.6) 16.9 °C (+8.4), 2025 6.6 °C (-1.9), 2011
Humidity Range 40% 44% 56%, 2022 22%, 2011
Pressure Range 2 hPa 5 hPa 11 hPa, 2012 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 13.2 [97%]128 hrs (187%) [84%] 13.2 [97%], 2026 0.1 [1%], 2015
Wet Hours 00 hrs (0%) [0%] 3, 2014 0, 2009
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 21.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 11th 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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose