Daily Report for 11th September 2026

Bad date specified. Defaulted to most recent report available.

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	15.6 °C (+3.6)	07:18	14.1 °C (+1.7)	19.3 °C (+7.3), 2023	8.1 °C (-3.9), 2020
Maximum Temperature	21.2 °C (+1.4)	15:58	22.2 °C (+1.6)	25.1 °C (+5.3), 2023	15.3 °C (-4.5), 2024
Mean Temperature	17.9 °C (+2.5)		18.1 °C (+1.6)	21.7 °C, 2023	10.7 °C, 2024
Minimum Humidity	57%	16:52	51%	76%, 2018	37%, 2012
Maximum Humidity	92%	04:15	86%	97%, 2022	79%, 2012
Mean Humidity	77%		71%	84%, 2022	58%, 2012
Minimum Pressure	1016 hPa	01:19	1015 hPa	1034 hPa, 2009	991 hPa, 2017
Maximum Pressure	1025 hPa	23:39	1021 hPa	1038 hPa, 2009	1001 hPa, 2017
Mean Pressure	1020 hPa		1019 hPa	1036 hPa, 2009	994 hPa, 2017
Mean Wind Speed	2.5 mph (-1.4)		4.9 mph (+1.0)	8.3 mph, 2017	2.1 mph, 2020
Maximum Wind Speed	9.9 mph	00:07	13.6 mph	21.5 mph, 2011	7.4 mph, 2014
Maximum Gust	13.8 mph	00:21	22.5 mph	31.7 mph, 2011	9.8 mph, 2014
Mean Wind Direction	n/a		W	NNW, 2013	NE, 2014
Rainfall	3.2 mm		21.8 mm (119%)	7.7 mm, 2017	0.0 mm, 2009
Maximum Hourly Rain	2.2 mm	01:01	0.7 mm	5.5 mm, 2017	0.9 mm, 2013
Maximum 10-min Rain	0.6 mm	00:16	0.3 mm	3.5 mm, 2017	0.4 mm, 2013
Maximum Rain Rate	3.6 mm/h	00:33	2.1 mm/h	53 mm/h, 2017	0.9 mm/h, 2013
Minimum Dew Point	11.9 °C	17:50	10.2 °C	16.1 °C, 2023	1.3 °C, 2012
Maximum Dew Point	15.4 °C	10:19	14.8 °C	18.3 °C, 2023	9.9 °C, 2024
Mean Dew Point	13.7 °C		12.4 °C	17.5 °C, 2023	6.8 °C, 2012
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	15.6 °C	07:17	14.6 °C	19.3 °C, 2023	8.1 °C, 2020
Day Maximum (09-21)	21.2 °C	16:07	22.0 °C	25.1 °C, 2023	15.3 °C, 2024
Max 10m Temp Rise	0.5 °C	09:20	0.6 °C	1.0 °C, 2016	0.3 °C, 2018
Max 1hr Temp Rise	1.5 °C	08:57	2.2 °C	3.7 °C, 2016	1.3 °C, 2018
Max 1hr Hum Rise	10%	18:50	9%	23%, 2025	4%, 2010
Max 10m Temp Fall	0.4 °C	11:07	0.6 °C	1.6 °C, 2025	0.2 °C, 2010
Max 1hr Temp Fall	1.5 °C	20:03	1.9 °C	4.3 °C, 2025	1.1 °C, 2010
Max 1hr Hum Fall	11%	11:32	11%	28%, 2016	4%, 2018
Max 10m Wind Speed	6.7 mph	00:27	10.0 mph	14.4 mph, 2017	4.3 mph, 2014
Minimum Feels-like	17.9 °C	23:58	15.9 °C	24.6 °C, 2023	5.1 °C, 2024
Maximum Feels-like	24.2 °C	15:59	25.2 °C	30.8 °C, 2023	15.8 °C, 2024
Mean Feels-like	21.1 °C		20.7 °C	27.3 °C, 2023	10.0 °C, 2024
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	0.6 µg/m³	15:35	1.2 µg/m³	0.6 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	12.4 µg/m³	22:20	11.0 µg/m³	12.4 µg/m³, 2026	12.4 µg/m³, 2026
Mean PM2.5	2.8 µg/m³		3.5 µg/m³	2.8 µg/m³, 2026	2.8 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	5.6 °C (-2.2)		8.1 °C	12.5 °C, 2016	4.5 °C, 2010
Humidity Range	35%		35%	51%, 2015	13%, 2019
Pressure Range	9 hPa		6 hPa	10 hPa, 2017	2 hPa, 2013

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 11th 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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