Daily Report for 27th August 2026

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 18.8 °C (+5.4) 03:19 15.3 °C (+1.1) 18.8 °C (+5.4), 2026 10.5 °C (-2.9), 2014
Maximum Temperature 25.1 °C (+3.4) 17:08 27.2 °C (+4.7) 31.7 °C (+10.0), 2019 17.3 °C (-4.4), 2010
Mean Temperature 20.7 °C (+4.4) 21.3 °C (+2.9) 24.1 °C, 2019 14.0 °C, 2010
Minimum Humidity 61% 17:28 38% 70%, 2020 39%, 2019
Maximum Humidity 90% 07:57 79% 98%, 2010 73%, 2017
Mean Humidity 79% 59% 85%, 2010 58%, 2017
Minimum Pressure 1008 hPa 17:05 1015 hPa 1023 hPa, 2021 1002 hPa, 2020
Maximum Pressure 1013 hPa 00:21 1020 hPa 1026 hPa, 2021 1009 hPa, 2025
Mean Pressure 1010 hPa 1018 hPa 1024 hPa, 2021 1007 hPa, 2025
Mean Wind Speed 3.2 mph (-0.8) 3.9 mph (-0.1) 6.3 mph, 2025 1.4 mph, 2017
Maximum Wind Speed 11.2 mph 17:33 12.3 mph 20.4 mph, 2025 6.1 mph, 2017
Maximum Gust 16.1 mph 16:52 19.1 mph 32.3 mph, 2025 9.4 mph, 2017
Mean Wind Direction S
Rainfall 4.4 mm 6.4 mm (14%) 4.8 mm, 2020
Maximum Hourly Rain 1.8 mm 06:27 2.6 mm, 2025
Maximum 10-min Rain 0.8 mm 05:49 2.4 mm, 2025
Maximum Rain Rate 3.6 mm/h 06:48 42 mm/h, 2015
Minimum Dew Point 13.4 °C 21:21 9.5 °C 14.0 °C, 2019 6.4 °C, 2013
Maximum Dew Point 19.1 °C 14:45 14.7 °C 19.1 °C, 2026 12.8 °C, 2011
Mean Dew Point 16.7 °C 12.2 °C 16.7 °C, 2026 10.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 18.8 °C 02:56 15.3 °C 18.8 °C, 2026 10.5 °C, 2014
Day Maximum (09-21) 25.1 °C 17:08 27.2 °C 31.7 °C, 2019 17.3 °C, 2010
Max 10m Temp Rise 0.6 °C 15:33 0.8 °C 0.9 °C, 2022 0.4 °C, 2015
Max 1hr Temp Rise 2.0 °C 13:35 3.0 °C 3.6 °C, 2019 1.6 °C, 2010
Max 1hr Hum Rise 6% 23:11 12% 16%, 2019 4%, 2018
Max 10m Temp Fall 0.4 °C 17:47 0.7 °C 0.7 °C, 2013 0.2 °C, 2014
Max 1hr Temp Fall 1.6 °C 18:35 2.4 °C 3.5 °C, 2017 0.8 °C, 2014
Max 1hr Hum Fall 11% 13:15 12% 18%, 2014 6%, 2017
Max 10m Wind Speed 8.7 mph 17:41 9.0 mph 13.3 mph, 2025 4.2 mph, 2017
Minimum Feels-like 22.8 °C 23:57 17.1 °C 22.8 °C, 2026 11.5 °C, 2014
Maximum Feels-like 30.7 °C 15:33 29.9 °C 37.9 °C, 2019 19.1 °C, 2010
Mean Feels-like 25.8 °C 23.8 °C 29.0 °C, 2019 15.8 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Minimum PM2.5 2 23:50 3 2, 2026 0, 2021
Maximum PM2.5 44 03:30 14 44, 2026 44, 2026
Mean PM2.5 16 7 16, 2026 16, 2026
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.3 °C (-2.0) 12.0 °C (+3.5) 15.6 °C (+7.2), 2019 4.7 °C (-3.6), 2020
Humidity Range 29% 41% 52%, 2013 24%, 2020
Pressure Range 4 hPa 5 hPa 17 hPa, 2020 3 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]261 hrs (161%) [72%] 11.5 [91%], 2019 0 [0%], 2026
Wet Hours 6
[Mean rain rate: 0.7 mm/h]		11 hrs (33%) [1.7%] 7, 2010 0, 2009
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 19.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 27th 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

day graph

Webcam Summary of Cloud Conditions

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose