Daily Report for 25th August 2026

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.8 °C (+1.2) 05:54 15.0 °C (+0.8) 18.5 °C (+4.9), 2016 7.8 °C (-5.8), 2018
Maximum Temperature 25.1 °C (+3.2) 14:39 27.4 °C (+4.7) 31.9 °C (+10.0), 2019 16.8 °C (-5.1), 2014
Mean Temperature 19.9 °C (+2.2) 21.3 °C (+2.8) 23.5 °C, 2019 12.5 °C, 2018
Minimum Humidity 39% 16:10 36% 80%, 2022 32%, 2019
Maximum Humidity 82% 05:58 79% 98%, 2013 82%, 2026
Mean Humidity 64% 57% 90%, 2022 55%, 2025
Minimum Pressure 1013 hPa 17:04 1016 hPa 1024 hPa, 2021 998 hPa, 2020
Maximum Pressure 1016 hPa 00:12 1021 hPa 1030 hPa, 2021 1006 hPa, 2012
Mean Pressure 1014 hPa 1018 hPa 1027 hPa, 2021 1002 hPa, 2012
Mean Wind Speed 5.8 mph (+1.8) 4.0 mph (-0.0) 9.8 mph, 2020 1.0 mph, 2017
Maximum Wind Speed 13.2 mph 14:25 12.4 mph 26.5 mph, 2020 6.9 mph, 2014
Maximum Gust 25.3 mph 01:12 19.2 mph 39.2 mph, 2020 10.2 mph, 2014
Mean Wind Direction ESE
Rainfall 0.0 mm 2.0 mm (5%) 38.5 mm, 2014
Maximum Hourly Rain n/a 9.2, 2014
Maximum 10-min Rain n/a 3.3, 2014
Maximum Rain Rate n/a 48, 2022
Minimum Dew Point 9.8 °C 16:10 9.2 °C 15.7 °C, 2016 6.6 °C, 2018
Maximum Dew Point 14.6 °C 22:16 14.4 °C 19.0 °C, 2016 11.6 °C, 2018
Mean Dew Point 12.4 °C 11.9 °C 17.1 °C, 2016 8.4 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.8 °C 05:59 15.1 °C 18.5 °C, 2016 7.8 °C, 2018
Day Maximum (09-21) 25.1 °C 14:17 27.4 °C 31.9 °C, 2019 16.8 °C, 2014
Max 10m Temp Rise 0.6 °C 09:42 0.8 °C 0.9 °C, 2025 0.2 °C, 2014
Max 1hr Temp Rise 2.2 °C 09:47 3.0 °C 4.7 °C, 2025 1.0 °C, 2014
Max 1hr Hum Rise 13% 19:55 12% 24%, 2009 5%, 2022
Max 10m Temp Fall 0.4 °C 14:53 0.8 °C 1.3 °C, 2018 0.2 °C, 2014
Max 1hr Temp Fall 1.8 °C 19:58 2.5 °C 3.3 °C, 2009 0.4 °C, 2014
Max 1hr Hum Fall 13% 11:11 12% 19%, 2025 1%, 2014
Max 10m Wind Speed 10.6 mph 14:05 9.0 mph 17.6 mph, 2020 4.6 mph, 2017
Minimum Feels-like 16.9 °C 05:44 16.7 °C 22.9 °C, 2016 5.0 °C, 2018
Maximum Feels-like 27.2 °C 13:51 29.8 °C 36.0 °C, 2019 18.9 °C, 2018
Mean Feels-like 22.5 °C 23.6 °C 27.8 °C, 2016 12.5 °C, 2018
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Minimum PM2.5 4 15:10 3 4, 2026 0, 2021
Maximum PM2.5 14 22:25 12 14, 2026 14, 2026
Mean PM2.5 6 6 6, 2026 6, 2026
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.3 °C (+2.0) 12.3 °C (+3.9) 16.1 °C (+7.7), 2019 3.3 °C (-5.0), 2014
Humidity Range 43% 42% 57%, 2019 16%, 2022
Pressure Range 3 hPa 5 hPa 15 hPa, 2020 2 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 12.8 [100%]253 hrs (168%) [76%] 12.8 [100%], 2025 0 [0%], 2014
Wet Hours 05 hrs (16%) [0.8%] 16, 2014 0, 2017
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 20.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 25th 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.
View monthly summary

Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose