Daily Report for 4th September 2026

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Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	15.1 °C (+2.5)	23:55	15.6 °C (+2.8)	15.9 °C (+3.3), 2016	10.1 °C (-2.5), 2010
Maximum Temperature	20.7 °C (-0.3)	08:04	22.4 °C (+1.3)	28.3 °C (+7.3), 2023	15.3 °C (-5.7), 2015
Mean Temperature	19.3 °C (+1.1)		19.3 °C (+2.1)	21.1 °C, 2023	12.8 °C, 2015
Minimum Humidity	56%	17:02	56%	80%, 2017	38%, 2023
Maximum Humidity	88%	09:34	86%	97%, 2017	84%, 2015
Mean Humidity	73%		72%	90%, 2017	67%, 2009
Minimum Pressure	1011 hPa	07:31	1016 hPa	1022 hPa, 2012	1003 hPa, 2009
Maximum Pressure	1020 hPa	23:56	1021 hPa	1028 hPa, 2023	1007 hPa, 2011
Mean Pressure	1015 hPa		1018 hPa	1024 hPa, 2023	1006 hPa, 2011
Mean Wind Speed	8.5 mph (+4.6)		6.7 mph (+2.8)	9.0 mph, 2016	1.4 mph, 2024
Maximum Wind Speed	19.7 mph	07:58	16.4 mph	20.2 mph, 2016	7.8 mph, 2014
Maximum Gust	32.3 mph	07:59	25.9 mph	32.3 mph, 2016	10.7 mph, 2014
Mean Wind Direction	n/a		W	NW, 2012	NNE, 2024
Rainfall	1.8 mm		2.0 mm (30%)	8.8 mm, 2017	0.0 mm, 2009
Maximum Hourly Rain	1.8 mm	09:06	0.5 mm	3.3 mm, 2011	0.4 mm, 2020
Maximum 10-min Rain	1.6 mm	08:58	0.5 mm	1.6 mm, 2026	0.2 mm, 2020
Maximum Rain Rate	14 mm/h	08:54	3.6 mm/h	24 mm/h, 2025	0.6 mm/h, 2020
Minimum Dew Point	10.4 °C	17:32	11.8 °C	13.2 °C, 2016	4.9 °C, 2009
Maximum Dew Point	17.8 °C	08:48	16.3 °C	18.6 °C, 2017	9.3 °C, 2009
Mean Dew Point	14.3 °C		13.9 °C	15.7 °C, 2017	7.4 °C, 2009
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	19.1 °C	08:59	16.6 °C	19.1 °C, 2026	10.1 °C, 2010
Day Maximum (09-21)	20.3 °C	11:53	22.3 °C	28.3 °C, 2023	15.3 °C, 2015
Max 10m Temp Rise	0.5 °C	11:15	0.6 °C	0.9 °C, 2010	0.4 °C, 2016
Max 1hr Temp Rise	1.4 °C	11:20	1.9 °C	4.0 °C, 2023	1.0 °C, 2016
Max 1hr Hum Rise	6%	20:46	8%	13%, 2020	3%, 2017
Max 10m Temp Fall	1.4 °C	09:03	0.7 °C	1.4 °C, 2026	0.2 °C, 2014
Max 1hr Temp Fall	2.7 °C	09:16	1.6 °C	2.7 °C, 2026	0.7 °C, 2014
Max 1hr Hum Fall	10%	11:30	11%	20%, 2023	5%, 2021
Max 10m Wind Speed	14.6 mph	08:02	12.2 mph	16.5 mph, 2016	5.1 mph, 2024
Minimum Feels-like	16.7 °C	23:52	18.0 °C	20.1 °C, 2016	10.3 °C, 2015
Maximum Feels-like	26.3 °C	08:18	26.8 °C	33.0 °C, 2023	16.4 °C, 2015
Mean Feels-like	22.9 °C		22.8 °C	25.2 °C, 2023	13.2 °C, 2015
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	0.2 µg/m³	05:12	0.9 µg/m³	0.2 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	12.2 µg/m³	22:55	9.5 µg/m³	12.2 µg/m³, 2026	12.2 µg/m³, 2026
Mean PM2.5	2.6 µg/m³		3.0 µg/m³	2.6 µg/m³, 2026	2.6 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	5.6 °C (-2.8)		6.9 °C	13.3 °C, 2013	3.7 °C, 2016
Humidity Range	32%		30%	58%, 2023	12%, 2021
Pressure Range	9 hPa		5 hPa	13 hPa, 2009	2 hPa, 2018

Observation	Detail
Sun Hours	n/a
Wet Hours	n/a
Cloud Cover	not available
Events	None
Comments	None known
Observer Absent?	No
Pond Temperature	n/a

Notes: Detailed daily weather report for Hampstead, NW3, London on 4th September 2026. Times of extremes use the midpoint of the longest continuous period at that value. Cumulative anomalies are relative to the expected value for the month-to-date. Sun and wet hours are derived from webcam/rainfall analysis and may be adjusted. Data should be viewed with appropriate caution.

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Daily Graph of Conditions

Wind direction

Air pollution

Wind rose

Webcam Summary of Cloud Conditions

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