Daily Report for 20th September 2026

Bad date specified. Defaulted to most recent report available.

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	10.7 °C (-0.4)	23:45	14.1 °C (+2.1)	16.7 °C (+5.6), 2018	8.4 °C (-2.7), 2015
Maximum Temperature	20.3 °C (+2.1)	15:19	22.1 °C (+2.2)	23.9 °C (+5.7), 2020	17.3 °C (-0.9), 2012
Mean Temperature	16.7 °C (+0.8)		18.0 °C (+2.2)	18.6 °C, 2018	13.2 °C, 2012
Minimum Humidity	42%	15:26	54%	92%, 2014	40%, 2019
Maximum Humidity	85%	00:37	87%	96%, 2014	78%, 2012
Mean Humidity	66%		72%	94%, 2014	62%, 2012
Minimum Pressure	1021 hPa	00:37	1016 hPa	1026 hPa, 2022	994 hPa, 2023
Maximum Pressure	1033 hPa	23:42	1022 hPa	1033 hPa, 2026	1005 hPa, 2023
Mean Pressure	1027 hPa		1019 hPa	1027 hPa, 2022	1000 hPa, 2023
Mean Wind Speed	3.5 mph (-0.4)		5.1 mph (+1.2)	10.5 mph, 2023	1.2 mph, 2022
Maximum Wind Speed	12.0 mph	09:39	13.6 mph	23.2 mph, 2023	5.8 mph, 2022
Maximum Gust	18.4 mph	01:28	22.8 mph	35.7 mph, 2023	9.2 mph, 2013
Mean Wind Direction	n/a		WNW	N, 2021	N, 2009
Rainfall	0.0 mm		26.2 mm (79%)	29.3 mm, 2014	0.0 mm, 2009
Maximum Hourly Rain	n/a		0.5 mm	18.7 mm, 2014	0.7 mm, 2018
Maximum 10-min Rain	n/a		0.3 mm	7.9 mm, 2014	0.2 mm, 2018
Maximum Rain Rate	n/a		1.9 mm/h	126 mm/h, 2014	0.8 mm/h, 2018
Minimum Dew Point	5.8 °C	23:12	10.2 °C	14.3 °C, 2018	3.0 °C, 2012
Maximum Dew Point	15.0 °C	00:12	15.2 °C	17.1 °C, 2014	8.3 °C, 2012
Mean Dew Point	9.8 °C		12.7 °C	15.6 °C, 2014	5.9 °C, 2012
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	16.0 °C	07:40	14.7 °C	16.9 °C, 2023	8.2 °C, 2017
Day Maximum (09-21)	20.3 °C	15:20	22.0 °C	23.9 °C, 2020	17.3 °C, 2012
Max 10m Temp Rise	0.5 °C	09:22	0.6 °C	0.8 °C, 2022	0.3 °C, 2011
Max 1hr Temp Rise	1.5 °C	10:09	2.2 °C	3.6 °C, 2022	0.8 °C, 2014
Max 1hr Hum Rise	13%	20:08	8%	15%, 2023	1%, 2014
Max 10m Temp Fall	0.7 °C	19:20	0.6 °C	1.1 °C, 2023	0.2 °C, 2014
Max 1hr Temp Fall	3.3 °C	19:49	1.8 °C	3.3 °C, 2026	0.8 °C, 2016
Max 1hr Hum Fall	12%	10:13	10%	18%, 2019	2%, 2014
Max 10m Wind Speed	8.9 mph	13:41	10.1 mph	16.8 mph, 2018	4.0 mph, 2022
Minimum Feels-like	10.7 °C	23:44	15.9 °C	20.4 °C, 2018	7.3 °C, 2012
Maximum Feels-like	21.9 °C	00:00	25.3 °C	27.3 °C, 2024	17.3 °C, 2012
Mean Feels-like	18.1 °C		20.8 °C	22.5 °C, 2018	13.0 °C, 2012
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	1.7 µg/m³	02:32	1.2 µg/m³	1.7 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	13.4 µg/m³	21:50	13.9 µg/m³	13.4 µg/m³, 2026	13.4 µg/m³, 2026
Mean PM2.5	4.1 µg/m³		3.9 µg/m³	4.1 µg/m³, 2026	4.1 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	9.6 °C (+2.5)		7.9 °C	10.8 °C, 2015	3.3 °C, 2014
Humidity Range	43%		33%	56%, 2019	4%, 2014
Pressure Range	12 hPa		6 hPa	15 hPa, 2018	2 hPa, 2022

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 20th 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.

View monthly summary

Daily Graph of Conditions

Wind direction

Air pollution

Wind rose

Webcam Summary of Cloud Conditions

Full resolution images at up-to 5 minute intervals