Daily Report for 26th September 2026

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.8 °C (-0.8) 07:33 13.3 °C (+1.7) 15.0 °C (+4.4), 2011 6.5 °C (-4.1), 2020
Maximum Temperature 21.2 °C (+3.7) 15:23 22.3 °C (+3.0) 23.8 °C (+6.3), 2018 11.6 °C (-5.9), 2020
Mean Temperature 16.0 °C (+1.5) 17.8 °C (+2.4) 17.8 °C, 2023 9.0 °C, 2020
Minimum Humidity 36% 17:40 53% 81%, 2024 33%, 2018
Maximum Humidity 84% 08:01 87% 98%, 2021 82%, 2025
Mean Humidity 61% 71% 91%, 2024 61%, 2026
Minimum Pressure 1021 hPa 00:45 1018 hPa 1030 hPa, 2018 983 hPa, 2024
Maximum Pressure 1025 hPa 09:55 1023 hPa 1035 hPa, 2018 991 hPa, 2024
Mean Pressure 1023 hPa 1021 hPa 1032 hPa, 2018 988 hPa, 2024
Mean Wind Speed 1.3 mph (-2.6) 4.3 mph (+0.4) 6.5 mph, 2019 1.1 mph, 2009
Maximum Wind Speed 7.8 mph 15:38 12.4 mph 20.6 mph, 2024 4.5 mph, 2009
Maximum Gust 11.5 mph 15:39 20.5 mph 34.6 mph, 2024 6.4 mph, 2009
Mean Wind Direction NW
Rainfall 0.0 mm 26.2 mm (60%) 24.2 mm, 2024
Maximum Hourly Rain n/a 12.5, 2024
Maximum 10-min Rain n/a 4.1, 2024
Maximum Rain Rate n/a 66, 2016
Minimum Dew Point 4.6 °C 17:40 9.5 °C 13.3 °C, 2011 2.0 °C, 2020
Maximum Dew Point 11.9 °C 00:04 14.9 °C 17.5 °C, 2023 7.8 °C, 2020
Mean Dew Point 8.0 °C 12.2 °C 14.5 °C, 2011 5.1 °C, 2020
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.8 °C 07:34 13.9 °C 16.3 °C, 2011 6.5 °C, 2020
Day Maximum (09-21) 21.2 °C 15:09 22.2 °C 23.8 °C, 2018 11.6 °C, 2020
Max 10m Temp Rise 0.8 °C 08:21 0.7 °C 1.0 °C, 2021 0.3 °C, 2020
Max 1hr Temp Rise 3.8 °C 09:02 2.5 °C 3.8 °C, 2026 1.0 °C, 2020
Max 1hr Hum Rise 12% 20:06 8% 15%, 2016 4%, 2020
Max 10m Temp Fall 0.8 °C 19:27 0.6 °C 1.3 °C, 2016 0.2 °C, 2020
Max 1hr Temp Fall 3.8 °C 20:09 1.9 °C 4.0 °C, 2018 0.7 °C, 2020
Max 1hr Hum Fall 12% 09:21 11% 15%, 2018 3%, 2010
Max 10m Wind Speed 5.1 mph 13:58 9.1 mph 17.2 mph, 2024 2.9 mph, 2009
Minimum Feels-like 9.5 °C 07:09 14.8 °C 18.1 °C, 2011 2.0 °C, 2020
Maximum Feels-like 21.7 °C 14:41 25.4 °C 27.3 °C, 2023 11.5 °C, 2020
Mean Feels-like 16.6 °C 20.3 °C 21.4 °C, 2011 8.0 °C, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Minimum PM2.5 1 04:42 1 1, 2026 0, 2021
Maximum PM2.5 14 20:45 15 14, 2026 14, 2026
Mean PM2.5 5 5 5, 2026 5, 2026
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 11.4 °C (+4.5) 9.0 °C (+1.4) 16.1 °C (+9.2), 2018 3.9 °C (-3.0), 2022
Humidity Range 48% 34% 58%, 2018 16%, 2024
Pressure Range 4 hPa 5 hPa 11 hPa, 2022 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10.4 [96%]159 hrs (123%) [53%] 10.9 [101%], 2018 0 [0%], 2025
Wet Hours 026 hrs (73%) [4.2%] 10, 2024 0, 2009
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 17.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 26th September 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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose