Daily Report for 18th September 2026

Bad date specified. Defaulted to most recent report available.

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	11.1 °C (-0.2)	06:41	14.2 °C (+2.0)	17.6 °C (+6.3), 2018	6.8 °C (-4.5), 2010
Maximum Temperature	20.6 °C (+2.1)	15:10	22.2 °C (+2.1)	24.2 °C (+5.7), 2014	15.3 °C (-3.2), 2013
Mean Temperature	15.7 °C (+0.9)		18.0 °C (+2.1)	19.2 °C, 2018	11.8 °C, 2011
Minimum Humidity	52%	15:22	54%	74%, 2015	37%, 2012
Maximum Humidity	86%	07:21	87%	96%, 2014	82%, 2012
Mean Humidity	71%		72%	85%, 2015	60%, 2012
Minimum Pressure	1013 hPa	00:28	1016 hPa	1029 hPa, 2019	995 hPa, 2013
Maximum Pressure	1016 hPa	10:20	1021 hPa	1032 hPa, 2019	1008 hPa, 2011
Mean Pressure	1015 hPa		1019 hPa	1030 hPa, 2019	1003 hPa, 2023
Mean Wind Speed	6.3 mph (+2.4)		5.0 mph (+1.1)	9.4 mph, 2018	1.6 mph, 2016
Maximum Wind Speed	15.0 mph	12:27	13.5 mph	21.3 mph, 2023	7.5 mph, 2019
Maximum Gust	26.5 mph	13:49	22.8 mph	34.6 mph, 2023	10.0 mph, 2011
Mean Wind Direction	n/a		W	N, 2016	NE, 2009
Rainfall	0.0 mm		26.2 mm (87%)	8.2 mm, 2023	0.0 mm, 2009
Maximum Hourly Rain	n/a		0.6 mm	7.9 mm, 2023	0.3 mm, 2013
Maximum 10-min Rain	n/a		0.3 mm	3.9 mm, 2023	0.3 mm, 2013
Maximum Rain Rate	n/a		2.1 mm/h	30 mm/h, 2023	2.6 mm/h, 2017
Minimum Dew Point	8.6 °C	05:57	10.3 °C	14.0 °C, 2025	0.2 °C, 2012
Maximum Dew Point	12.6 °C	23:57	15.1 °C	17.7 °C, 2014	7.5 °C, 2010
Mean Dew Point	10.2 °C		12.7 °C	15.9 °C, 2025	5.4 °C, 2010
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	11.1 °C	06:41	14.6 °C	17.7 °C, 2025	6.8 °C, 2010
Day Maximum (09-21)	20.6 °C	15:12	22.0 °C	24.2 °C, 2014	15.3 °C, 2013
Max 10m Temp Rise	0.6 °C	09:23	0.6 °C	0.9 °C, 2019	0.3 °C, 2016
Max 1hr Temp Rise	2.5 °C	09:28	2.3 °C	3.9 °C, 2019	0.7 °C, 2025
Max 1hr Hum Rise	8%	17:08	8%	14%, 2021	4%, 2016
Max 10m Temp Fall	0.4 °C	17:08	0.6 °C	1.0 °C, 2023	0.2 °C, 2016
Max 1hr Temp Fall	1.4 °C	17:09	1.7 °C	2.1 °C, 2019	0.8 °C, 2016
Max 1hr Hum Fall	10%	10:23	10%	16%, 2017	4%, 2025
Max 10m Wind Speed	11.9 mph	13:52	10.0 mph	16.3 mph, 2023	5.1 mph, 2019
Minimum Feels-like	11.8 °C	06:13	16.0 °C	19.8 °C, 2025	5.2 °C, 2010
Maximum Feels-like	22.2 °C	15:06	25.5 °C	28.5 °C, 2024	15.7 °C, 2013
Mean Feels-like	17.1 °C		20.8 °C	23.4 °C, 2025	11.7 °C, 2010
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	2.0 µg/m³	01:15	1.2 µg/m³	2.0 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	12.2 µg/m³	21:00	14.0 µg/m³	12.2 µg/m³, 2026	12.2 µg/m³, 2026
Mean PM2.5	6.2 µg/m³		3.9 µg/m³	6.2 µg/m³, 2026	6.2 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	9.5 °C (+2.3)		8.0 °C	11.4 °C, 2019	4.4 °C, 2018
Humidity Range	34%		33%	45%, 2012	16%, 2025
Pressure Range	3 hPa		5 hPa	19 hPa, 2012	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 18th 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