Daily Report for 17th September 2026

Bad date specified. Defaulted to most recent report available.

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	13.4 °C (+2.0)	04:14	14.3 °C (+2.2)	17.3 °C (+5.9), 2018	5.0 °C (-6.4), 2022
Maximum Temperature	20.6 °C (+1.9)	14:43	22.2 °C (+2.1)	24.8 °C (+6.1), 2018	13.4 °C (-5.3), 2013
Mean Temperature	16.2 °C (+1.9)		18.2 °C (+2.2)	20.3 °C, 2018	11.0 °C, 2022
Minimum Humidity	47%	17:55	54%	80%, 2023	36%, 2018
Maximum Humidity	90%	09:34	87%	95%, 2013	84%, 2009
Mean Humidity	68%		72%	89%, 2023	65%, 2012
Minimum Pressure	1011 hPa	14:45	1016 hPa	1030 hPa, 2024	987 hPa, 2015
Maximum Pressure	1018 hPa	00:02	1022 hPa	1033 hPa, 2024	1005 hPa, 2013
Mean Pressure	1013 hPa		1019 hPa	1032 hPa, 2024	999 hPa, 2015
Mean Wind Speed	5.7 mph (+1.8)		5.0 mph (+1.1)	8.3 mph, 2016	2.2 mph, 2017
Maximum Wind Speed	15.0 mph	15:44	13.4 mph	20.5 mph, 2016	8.1 mph, 2014
Maximum Gust	27.6 mph	12:48	22.6 mph	30.6 mph, 2016	12.5 mph, 2014
Mean Wind Direction	n/a		WNW	N, 2017	NNE, 2019
Rainfall	1.0 mm		26.2 mm (92%)	5.5 mm, 2013	0.0 mm, 2009
Maximum Hourly Rain	0.6 mm	07:13	0.6 mm	2.6 mm, 2023	0.6 mm, 2026
Maximum 10-min Rain	0.4 mm	06:51	0.3 mm	2.2 mm, 2023	0.3 mm, 2011
Maximum Rain Rate	0.5 mm/h	07:13	2.2 mm/h	30 mm/h, 2023	0.5 mm/h, 2026
Minimum Dew Point	6.8 °C	18:05	10.4 °C	13.9 °C, 2014	2.0 °C, 2022
Maximum Dew Point	14.6 °C	11:02	15.3 °C	17.7 °C, 2023	5.0 °C, 2022
Mean Dew Point	10.1 °C		12.8 °C	16.1 °C, 2023	3.6 °C, 2022
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	13.4 °C	04:16	14.8 °C	17.3 °C, 2018	5.0 °C, 2022
Day Maximum (09-21)	20.6 °C	14:44	22.1 °C	24.8 °C, 2018	13.4 °C, 2013
Max 10m Temp Rise	0.8 °C	12:29	0.6 °C	0.8 °C, 2026	0.3 °C, 2016
Max 1hr Temp Rise	2.7 °C	11:25	2.2 °C	3.1 °C, 2024	0.8 °C, 2016
Max 1hr Hum Rise	7%	07:29	8%	15%, 2020	4%, 2014
Max 10m Temp Fall	0.9 °C	12:04	0.6 °C	0.9 °C, 2026	0.2 °C, 2014
Max 1hr Temp Fall	1.2 °C	19:27	1.8 °C	2.6 °C, 2010	0.3 °C, 2025
Max 1hr Hum Fall	16%	11:59	10%	26%, 2012	2%, 2016
Max 10m Wind Speed	11.1 mph	13:09	9.9 mph	14.0 mph, 2016	6.0 mph, 2019
Minimum Feels-like	14.4 °C	03:48	16.3 °C	20.3 °C, 2018	4.0 °C, 2022
Maximum Feels-like	22.5 °C	11:50	25.7 °C	27.5 °C, 2018	15.4 °C, 2010
Mean Feels-like	17.5 °C		21.0 °C	23.3 °C, 2018	10.0 °C, 2022
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	0.6 µg/m³	04:55	1.1 µg/m³	0.6 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	9.2 µg/m³	20:45	14.1 µg/m³	9.2 µg/m³, 2026	9.2 µg/m³, 2026
Mean PM2.5	2.6 µg/m³		3.8 µg/m³	2.6 µg/m³, 2026	2.6 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	7.2 °C (-0.1)		7.9 °C	12.0 °C, 2022	3.9 °C, 2014
Humidity Range	43%		33%	52%, 2018	10%, 2016
Pressure Range	7 hPa		5 hPa	20 hPa, 2015	2 hPa, 2009

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 17th 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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