Daily Report for 19th September 2026

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Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	16.7 °C (+5.5)	00:47	14.3 °C (+2.2)	16.9 °C (+5.7), 2018	6.9 °C (-4.3), 2012
Maximum Temperature	22.2 °C (+3.8)	12:21	22.2 °C (+2.2)	26.8 °C (+8.4), 2025	14.7 °C (-3.7), 2017
Mean Temperature	19.2 °C (+4.6)		18.1 °C (+2.2)	20.0 °C, 2025	10.9 °C, 2017
Minimum Humidity	64%	12:24	54%	79%, 2023	38%, 2012
Maximum Humidity	87%	06:51	87%	96%, 2014	80%, 2010
Mean Humidity	77%		73%	88%, 2014	58%, 2012
Minimum Pressure	1014 hPa	02:27	1016 hPa	1030 hPa, 2019	1005 hPa, 2023
Maximum Pressure	1021 hPa	23:58	1021 hPa	1033 hPa, 2019	1010 hPa, 2023
Mean Pressure	1017 hPa		1019 hPa	1032 hPa, 2019	1007 hPa, 2023
Mean Wind Speed	7.7 mph (+3.8)		5.2 mph (+1.3)	9.8 mph, 2023	1.0 mph, 2021
Maximum Wind Speed	18.1 mph	21:31	13.7 mph	24.1 mph, 2018	6.0 mph, 2022
Maximum Gust	27.6 mph	00:12	23.0 mph	40.3 mph, 2018	8.1 mph, 2015
Mean Wind Direction	n/a		W	N, 2015	N, 2022
Rainfall	0.0 mm		26.2 mm (83%)	5.4 mm, 2014	0.0 mm, 2009
Maximum Hourly Rain	n/a		0.5 mm	4.7 mm, 2014	0.2 mm, 2023
Maximum 10-min Rain	n/a		0.3 mm	3.6 mm, 2014	0.2 mm, 2023
Maximum Rain Rate	n/a		2.0 mm/h	66 mm/h, 2014	1.3 mm/h, 2013
Minimum Dew Point	12.5 °C	00:08	10.4 °C	14.7 °C, 2014	1.5 °C, 2012
Maximum Dew Point	16.7 °C	16:29	15.2 °C	19.0 °C, 2014	6.2 °C, 2012
Mean Dew Point	15.0 °C		12.8 °C	16.3 °C, 2014	3.4 °C, 2012
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	16.7 °C	00:47	14.7 °C	17.1 °C, 2018	6.9 °C, 2012
Day Maximum (09-21)	22.2 °C	12:21	22.0 °C	26.8 °C, 2025	14.7 °C, 2017
Max 10m Temp Rise	0.5 °C	12:17	0.6 °C	0.9 °C, 2019	0.4 °C, 2016
Max 1hr Temp Rise	1.7 °C	10:49	2.2 °C	4.6 °C, 2019	1.2 °C, 2010
Max 1hr Hum Rise	7%	16:29	8%	12%, 2013	5%, 2010
Max 10m Temp Fall	0.6 °C	23:50	0.6 °C	0.8 °C, 2012	0.2 °C, 2010
Max 1hr Temp Fall	1.4 °C	23:58	1.7 °C	2.7 °C, 2017	0.5 °C, 2023
Max 1hr Hum Fall	7%	10:23	10%	20%, 2019	4%, 2010
Max 10m Wind Speed	12.8 mph	12:42	10.1 mph	17.8 mph, 2018	3.6 mph, 2015
Minimum Feels-like	19.3 °C	00:26	16.2 °C	20.5 °C, 2018	4.7 °C, 2012
Maximum Feels-like	26.5 °C	14:25	25.5 °C	31.0 °C, 2025	15.6 °C, 2017
Mean Feels-like	23.1 °C		20.9 °C	23.8 °C, 2025	11.1 °C, 2017
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	1.2 µg/m³	10:17	1.2 µg/m³	1.2 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	12.0 µg/m³	08:10	13.9 µg/m³	12.0 µg/m³, 2026	12.0 µg/m³, 2026
Mean PM2.5	4.3 µg/m³		3.9 µg/m³	4.3 µg/m³, 2026	4.3 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	5.5 °C (-1.6)		7.9 °C	13.0 °C, 2019	4.9 °C, 2018
Humidity Range	23%		33%	47%, 2025	9%, 2023
Pressure Range	6 hPa		5 hPa	9 hPa, 2011	2 hPa, 2016

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 19th 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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