Daily Report for 31st August 2026

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.9 °C (+1.9) 06:21 15.4 °C (+1.4) 16.1 °C (+3.1), 2009 6.7 °C (-6.3), 2012
Maximum Temperature 23.5 °C (+2.1) 15:11 26.7 °C (+4.2) 25.4 °C (+4.0), 2009 15.7 °C (-5.7), 2015
Mean Temperature 18.1 °C (+2.0) 21.0 °C (+2.8) 19.4 °C, 2009 12.5 °C, 2020
Minimum Humidity 54% 14:06 41% 89%, 2015 34%, 2009
Maximum Humidity 83% 02:42 80% 96%, 2009 80%, 2012
Mean Humidity 72% 61% 92%, 2015 57%, 2013
Minimum Pressure 1006 hPa 02:55 1014 hPa 1029 hPa, 2021 1003 hPa, 2025
Maximum Pressure 1020 hPa 23:49 1019 hPa 1032 hPa, 2021 1006 hPa, 2025
Mean Pressure 1012 hPa 1016 hPa 1030 hPa, 2021 1005 hPa, 2025
Mean Wind Speed 5.9 mph (+1.9) 4.2 mph (+0.2) 6.7 mph, 2025 0.2 mph, 2020
Maximum Wind Speed 16.9 mph 15:29 12.9 mph 19.0 mph, 2025 5.3 mph, 2020
Maximum Gust 23.0 mph 15:30 20.0 mph 32.3 mph, 2025 7.8 mph, 2011
Mean Wind Direction NW
Rainfall 1.6 mm 12.8 mm (24%) 17.5 mm, 2015
Maximum Hourly Rain 1.6 mm 15:43 9.3 mm, 2015
Maximum 10-min Rain 1.0 mm 15:37 3.9 mm, 2015
Maximum Rain Rate 7 mm/h 15:31 54 mm/h, 2015
Minimum Dew Point 11.1 °C 23:37 9.9 °C 12.8 °C, 2015 2.7 °C, 2012
Maximum Dew Point 15.6 °C 16:25 14.9 °C 17.9 °C, 2009 7.8 °C, 2012
Mean Dew Point 13.0 °C 12.5 °C 13.5 °C, 2024 4.6 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.9 °C 06:22 15.4 °C 16.1 °C, 2009 6.7 °C, 2012
Day Maximum (09-21) 23.5 °C 15:11 26.7 °C 25.4 °C, 2009 15.4 °C, 2015
Max 10m Temp Rise 0.7 °C 12:23 0.8 °C 0.8 °C, 2010 0.2 °C, 2015
Max 1hr Temp Rise 2.0 °C 09:19 2.8 °C 3.9 °C, 2010 0.8 °C, 2015
Max 1hr Hum Rise 25% 16:17 12% 25%, 2026 2%, 2015
Max 10m Temp Fall 2.6 °C 15:37 0.8 °C 2.6 °C, 2026 0.2 °C, 2015
Max 1hr Temp Fall 4.6 °C 15:57 2.4 °C 4.7 °C, 2019 0.6 °C, 2015
Max 1hr Hum Fall 8% 19:15 12% 15%, 2009 1%, 2015
Max 10m Wind Speed 10.9 mph 09:55 9.4 mph 13.9 mph, 2025 2.6 mph, 2020
Minimum Feels-like 16.9 °C 05:53 17.3 °C 17.8 °C, 2009 4.2 °C, 2012
Maximum Feels-like 27.0 °C 15:11 29.6 °C 28.4 °C, 2009 17.6 °C, 2020
Mean Feels-like 20.9 °C 23.6 °C 22.7 °C, 2009 12.6 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Minimum PM2.5 0 06:20 3 0, 2026 0, 2021
Maximum PM2.5 12 19:55 14 12, 2026 12, 2026
Mean PM2.5 3 6 3, 2026 3, 2026
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.6 °C (+0.2) 11.3 °C (+2.9) 11.3 °C (+2.9), 2012 1.6 °C (-6.8), 2015
Humidity Range 29% 39% 62%, 2009 4%, 2015
Pressure Range 14 hPa 5 hPa 14 hPa, 2026 1 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5.2 [42%]266 hrs (144%) [65%] 11 [89%], 2010 0 [0%], 2015
Wet Hours 1
[Mean rain rate: 1.6 mm/h]		19 hrs (50%) [2.6%] 12, 2015 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 31st 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

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Wind rose