Daily Report for 12th September 2026

Bad date specified. Defaulted to most recent report available.

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	12.4 °C (+0.5)	06:47	14.0 °C (+1.6)	14.6 °C (+2.7), 2011	6.2 °C (-5.7), 2024
Maximum Temperature	23.7 °C (+4.1)	16:19	22.3 °C (+1.8)	25.8 °C (+6.2), 2022	14.5 °C (-5.1), 2024
Mean Temperature	18.0 °C (+2.3)		18.1 °C (+1.7)	20.3 °C, 2022	10.0 °C, 2024
Minimum Humidity	59%	14:20	52%	72%, 2013	48%, 2011
Maximum Humidity	86%	06:29	86%	97%, 2013	83%, 2012
Mean Humidity	74%		71%	87%, 2018	65%, 2015
Minimum Pressure	1022 hPa	16:33	1016 hPa	1028 hPa, 2009	995 hPa, 2017
Maximum Pressure	1025 hPa	01:00	1022 hPa	1034 hPa, 2009	1007 hPa, 2017
Mean Pressure	1024 hPa		1019 hPa	1031 hPa, 2009	1004 hPa, 2017
Mean Wind Speed	6.3 mph (+2.4)		5.0 mph (+1.1)	10.8 mph, 2011	0.8 mph, 2021
Maximum Wind Speed	16.5 mph	13:32	13.8 mph	22.1 mph, 2011	5.6 mph, 2021
Maximum Gust	26.5 mph	17:47	22.9 mph	37.4 mph, 2011	8.7 mph, 2013
Mean Wind Direction	n/a		W	N, 2024	N, 2018
Rainfall	0.0 mm		21.8 mm (109%)	3.1 mm, 2018	0.0 mm, 2009
Maximum Hourly Rain	n/a		0.6 mm	2.3 mm, 2012	0.3 mm, 2011
Maximum 10-min Rain	n/a		0.3 mm	2.3 mm, 2012	0.2 mm, 2018
Maximum Rain Rate	n/a		1.9 mm/h	60 mm/h, 2012	1.2 mm/h, 2018
Minimum Dew Point	9.9 °C	06:47	10.2 °C	13.1 °C, 2022	2.6 °C, 2012
Maximum Dew Point	16.0 °C	16:35	14.9 °C	18.2 °C, 2022	10.0 °C, 2024
Mean Dew Point	13.1 °C		12.5 °C	16.3 °C, 2023	6.5 °C, 2024
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	12.4 °C	06:46	14.4 °C	17.7 °C, 2023	6.2 °C, 2024
Day Maximum (09-21)	23.7 °C	16:26	22.2 °C	25.8 °C, 2022	14.5 °C, 2024
Max 10m Temp Rise	0.8 °C	09:01	0.6 °C	0.9 °C, 2022	0.3 °C, 2018
Max 1hr Temp Rise	3.1 °C	09:03	2.3 °C	3.4 °C, 2012	1.1 °C, 2018
Max 1hr Hum Rise	5%	19:44	8%	19%, 2025	5%, 2011
Max 10m Temp Fall	0.3 °C	12:20	0.6 °C	1.3 °C, 2025	0.3 °C, 2026
Max 1hr Temp Fall	1.3 °C	20:10	1.8 °C	3.8 °C, 2025	1.0 °C, 2013
Max 1hr Hum Fall	10%	09:02	11%	16%, 2014	6%, 2013
Max 10m Wind Speed	12.2 mph	13:38	10.2 mph	14.8 mph, 2011	3.7 mph, 2021
Minimum Feels-like	13.6 °C	06:35	15.7 °C	17.5 °C, 2022	3.3 °C, 2024
Maximum Feels-like	28.3 °C	16:15	25.4 °C	31.8 °C, 2022	15.6 °C, 2024
Mean Feels-like	20.9 °C		20.7 °C	25.0 °C, 2022	9.2 °C, 2024
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	2.5 µg/m³	09:37	1.3 µg/m³	2.5 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	8.1 µg/m³	15:45	10.8 µg/m³	8.1 µg/m³, 2026	8.1 µg/m³, 2026
Mean PM2.5	4.5 µg/m³		3.5 µg/m³	4.5 µg/m³, 2026	4.5 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	11.3 °C (+3.6)		8.4 °C	14.4 °C, 2016	5.7 °C, 2013
Humidity Range	27%		34%	44%, 2011	23%, 2018
Pressure Range	3 hPa		6 hPa	12 hPa, 2017	2 hPa, 2021

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 12th 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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