Daily Report for 17th May 2026

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.7 °C (+0.6) 23:58 7.5 °C (-0.8) 12.2 °C (+3.1), 2017 5.7 °C (-3.4), 2010
Maximum Temperature 17.7 °C (-0.2) 16:45 16.9 °C (-0.2) 25.9 °C (+8.0), 2022 11.6 °C (-6.3), 2013
Mean Temperature 13.0 °C (+0.2) 12.3 °C (-0.5) 19.4 °C, 2022 9.7 °C, 2013
Minimum Humidity 38% 16:42 49% 78%, 2017 37%, 2015
Maximum Humidity 88% 03:50 85% 96%, 2024 76%, 2015
Mean Humidity 68% 69% 87%, 2021 54%, 2015
Minimum Pressure 1009 hPa 02:00 1011 hPa 1028 hPa, 2023 998 hPa, 2021
Maximum Pressure 1013 hPa 23:35 1016 hPa 1030 hPa, 2023 1010 hPa, 2009
Mean Pressure 1011 hPa 1013 hPa 1029 hPa, 2023 1006 hPa, 2013
Mean Wind Speed 5.5 mph (+0.8) 3.8 mph (-0.9) 9.6 mph, 2009 1.2 mph, 2014
Maximum Wind Speed 13.1 mph 16:22 12.0 mph 14.1 mph, 2021 6.4 mph, 2014
Maximum Gust 19.6 mph 16:21 19.0 mph 33.0 mph, 2009 8.7 mph, 2014
Mean Wind Direction WNW
Rainfall 0.4 mm 9.0 mm (36%) 35.6 mm, 2017
Maximum Hourly Rain 0.4 mm 02:10 6.9 mm, 2017
Maximum 10-min Rain 0.4 mm 02:10 2.4 mm, 2021
Maximum Rain Rate n/a 32.8, 2009
Minimum Dew Point 3.1 °C 16:15 3.4 °C 10.1 °C, 2017 0.6 °C, 2012
Maximum Dew Point 9.4 °C 01:57 9.1 °C 16.2 °C, 2017 5.5 °C, 2012
Mean Dew Point 6.8 °C 6.3 °C 13.6 °C, 2017 3.2 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 10.0 °C * 06:12 7.8 °C 16.0 °C, 2017 5.7 °C, 2010
Day Maximum (09-21) 17.7 °C 16:46 16.9 °C 25.9 °C, 2022 11.6 °C, 2013
Max 10m Temp Rise 0.9 °C 13:41 0.8 °C 0.9 °C, 2022 0.4 °C, 2019
Max 1hr Temp Rise 2.0 °C 08:54 2.7 °C 4.0 °C, 2024 1.2 °C, 2019
Max 1hr Hum Rise 15% 18:28 12% 22%, 2021 4%, 2017
Max 10m Temp Fall 0.6 °C 12:28 0.9 °C 2.5 °C, 2021 0.3 °C, 2019
Max 1hr Temp Fall 2.3 °C 18:47 2.2 °C 4.7 °C, 2021 0.9 °C, 2019
Max 1hr Hum Fall 14% 12:16 12% 24%, 2009 4%, 2017
Max 10m Wind Speed 10.0 mph 18:15 8.8 mph 11.3 mph, 2022 4.9 mph, 2014
Minimum Feels-like 7.9 °C 23:52 5.9 °C 13.5 °C, 2017 2.5 °C, 2018
Maximum Feels-like 17.7 °C 16:44 17.3 °C 30.1 °C, 2022 11.6 °C, 2013
Mean Feels-like 13.3 °C 12.3 °C 22.2 °C, 2022 9.4 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.0 °C (-0.7) 9.4 °C (+0.5) 15.5 °C (+6.8), 2022 5.5 °C (-3.2), 2013
Humidity Range 50% 36% 53%, 2020 11%, 2017
Pressure Range 4 hPa 4 hPa 14 hPa, 2012 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5.7 [40%]96 hrs (95%) [41%] 13 [91%], 2018 0 [0%], 2017
Wet Hours 1
[Mean rain rate: 0.4 mm/h]		13 hrs (59%) [3.2%] 14, 2017 0, 2010
Cloud Cover unknown
Events None
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 13.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 17th May 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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