Daily Report for 29th August 2026

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 17.5 °C (+4.3) 11:22 15.3 °C (+1.3) 17.5 °C (+4.3), 2026 9.1 °C (-4.1), 2009
Maximum Temperature 20.8 °C (-0.8) 15:01 26.9 °C (+4.4) 25.3 °C (+3.8), 2017 14.7 °C (-6.9), 2020
Mean Temperature 18.6 °C (+1.8) 21.1 °C (+2.9) 20.6 °C, 2017 12.6 °C, 2020
Minimum Humidity 78% 00:12 40% 78%, 2026 41%, 2009
Maximum Humidity 88% 13:52 80% 95%, 2018 80%, 2017
Mean Humidity 83% 60% 84%, 2020 63%, 2013
Minimum Pressure 1001 hPa 17:17 1015 hPa 1025 hPa, 2021 995 hPa, 2025
Maximum Pressure 1010 hPa 00:38 1019 hPa 1027 hPa, 2021 1003 hPa, 2025
Mean Pressure 1006 hPa 1017 hPa 1026 hPa, 2021 998 hPa, 2025
Mean Wind Speed 6.3 mph (+2.3) 4.1 mph (+0.1) 7.2 mph, 2014 1.8 mph, 2018
Maximum Wind Speed 18.8 mph 15:28 12.7 mph 18.8 mph, 2026 7.0 mph, 2017
Maximum Gust 28.8 mph 15:31 19.7 mph 28.8 mph, 2026 12.5 mph, 2015
Mean Wind Direction WSW
Rainfall 3.4 mm 10.2 mm (20%) 19.2 mm, 2025
Maximum Hourly Rain 1.4 mm 11:56 7.0 mm, 2025
Maximum 10-min Rain 0.8 mm 11:00 2.0 mm, 2012
Maximum Rain Rate 14 mm/h 11:56 60 mm/h, 2012
Minimum Dew Point 14.4 °C 02:03 9.8 °C 14.4 °C, 2026 3.0 °C, 2010
Maximum Dew Point 17.7 °C 14:39 14.9 °C 17.7 °C, 2026 10.0 °C, 2009
Mean Dew Point 15.7 °C 12.4 °C 15.7 °C, 2026 7.2 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 17.8 °C * 04:36 15.4 °C 17.8 °C, 2026 9.1 °C, 2009
Day Maximum (09-21) 20.8 °C 15:01 26.9 °C 25.3 °C, 2017 14.7 °C, 2020
Max 10m Temp Rise 0.5 °C 13:58 0.8 °C 0.8 °C, 2013 0.3 °C, 2020
Max 1hr Temp Rise 1.8 °C 14:52 2.9 °C 3.0 °C, 2013 1.2 °C, 2020
Max 1hr Hum Rise 5% 09:42 12% 21%, 2010 5%, 2011
Max 10m Temp Fall 0.6 °C 15:11 0.8 °C 1.8 °C, 2012 0.3 °C, 2015
Max 1hr Temp Fall 0.9 °C 11:27 2.4 °C 4.2 °C, 2012 0.8 °C, 2014
Max 1hr Hum Fall 7% 14:57 12% 37%, 2010 5%, 2020
Max 10m Wind Speed 14.2 mph 15:35 9.3 mph 14.2 mph, 2012 5.2 mph, 2018
Minimum Feels-like 21.1 °C 11:17 17.2 °C 21.1 °C, 2026 7.6 °C, 2009
Maximum Feels-like 26.3 °C 14:52 29.7 °C 28.9 °C, 2017 16.1 °C, 2020
Mean Feels-like 23.0 °C 23.8 °C 23.7 °C, 2017 13.8 °C, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Minimum PM2.5 1 16:40 3 1, 2026 0, 2021
Maximum PM2.5 8 20:15 14 8, 2026 8, 2026
Mean PM2.5 3 6 3, 2026 3, 2026
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.3 °C (-5.1) 11.6 °C (+3.1) 10.2 °C (+1.8), 2009 3.3 °C (-5.1), 2026
Humidity Range 10% 40% 52%, 2009 10%, 2026
Pressure Range 8 hPa 5 hPa 12 hPa, 2020 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]261 hrs (150%) [68%] 10 [80%], 2013 0 [0%], 2026
Wet Hours 4
[Mean rain rate: 0.8 mm/h]		17 hrs (48%) [2.4%] 8, 2025 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 29th 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