Daily Report for 26th September 2026

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Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	9.8 °C (-0.8)	07:33	13.3 °C (+1.6)	15.0 °C (+4.4), 2011	6.5 °C (-4.1), 2020
Maximum Temperature	21.2 °C (+3.7)	15:23	22.3 °C (+2.9)	23.8 °C (+6.3), 2018	11.6 °C (-5.9), 2020
Mean Temperature	16.0 °C (+1.5)		17.8 °C (+2.2)	17.8 °C, 2023	9.0 °C, 2020
Minimum Humidity	36%	17:40	53%	81%, 2024	33%, 2018
Maximum Humidity	84%	08:01	87%	98%, 2021	82%, 2025
Mean Humidity	61%		71%	91%, 2024	61%, 2026
Minimum Pressure	1021 hPa	00:45	1018 hPa	1030 hPa, 2018	983 hPa, 2024
Maximum Pressure	1025 hPa	09:55	1023 hPa	1035 hPa, 2018	991 hPa, 2024
Mean Pressure	1023 hPa		1021 hPa	1032 hPa, 2018	988 hPa, 2024
Mean Wind Speed	1.3 mph (-2.6)		4.3 mph (+0.4)	6.5 mph, 2019	1.1 mph, 2009
Maximum Wind Speed	7.8 mph	15:38	12.4 mph	20.6 mph, 2024	4.5 mph, 2009
Maximum Gust	11.5 mph	15:39	20.5 mph	34.6 mph, 2024	6.4 mph, 2009
Mean Wind Direction	n/a		W	NNW, 2010	NE, 2015
Rainfall	0.0 mm		26.2 mm (60%)	24.2 mm, 2024	0.0 mm, 2009
Maximum Hourly Rain	n/a		0.4 mm	12.5 mm, 2024	0.2 mm, 2020
Maximum 10-min Rain	n/a		0.2 mm	4.1 mm, 2024	0.5 mm, 2010
Maximum Rain Rate	n/a		1.5 mm/h	66 mm/h, 2016	2.5 mm/h, 2012
Minimum Dew Point	4.6 °C	17:40	9.5 °C	13.3 °C, 2011	2.0 °C, 2020
Maximum Dew Point	11.9 °C	00:04	14.9 °C	17.5 °C, 2023	7.8 °C, 2020
Mean Dew Point	8.0 °C		12.2 °C	14.5 °C, 2011	5.1 °C, 2020
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	9.8 °C	07:34	13.9 °C	16.3 °C, 2011	6.5 °C, 2020
Day Maximum (09-21)	21.2 °C	15:09	22.2 °C	23.8 °C, 2018	11.6 °C, 2020
Max 10m Temp Rise	0.8 °C	08:21	0.7 °C	1.0 °C, 2021	0.3 °C, 2020
Max 1hr Temp Rise	3.8 °C	09:02	2.5 °C	3.8 °C, 2026	1.0 °C, 2020
Max 1hr Hum Rise	12%	20:06	8%	15%, 2016	4%, 2020
Max 10m Temp Fall	0.8 °C	19:27	0.6 °C	1.3 °C, 2016	0.2 °C, 2020
Max 1hr Temp Fall	3.8 °C	20:09	1.9 °C	4.0 °C, 2018	0.7 °C, 2020
Max 1hr Hum Fall	12%	09:21	11%	15%, 2018	3%, 2010
Max 10m Wind Speed	5.1 mph	13:58	9.1 mph	17.2 mph, 2024	2.9 mph, 2009
Minimum Feels-like	9.5 °C	07:09	14.8 °C	18.1 °C, 2011	2.0 °C, 2020
Maximum Feels-like	21.7 °C	14:41	25.4 °C	27.3 °C, 2023	11.5 °C, 2020
Mean Feels-like	16.6 °C		20.3 °C	21.4 °C, 2011	8.0 °C, 2020
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	1.4 µg/m³	04:42	1.4 µg/m³	1.4 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	13.9 µg/m³	20:45	14.5 µg/m³	13.9 µg/m³, 2026	13.9 µg/m³, 2026
Mean PM2.5	4.7 µg/m³		4.7 µg/m³	4.7 µg/m³, 2026	4.7 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	11.4 °C (+4.5)		9.0 °C	16.1 °C, 2018	3.9 °C, 2022
Humidity Range	48%		34%	58%, 2018	16%, 2024
Pressure Range	4 hPa		5 hPa	11 hPa, 2022	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 26th 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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