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Last Full Update: 02 Nov 2026, 07:25 GMTUpdated: 02 Nov 26 07:25
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Daily Report for 21st September 2025

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature9.1 °C (-2.0)07:3312.4 °C (+0.5)14.7 °C (+3.6), 20247.8 °C (-3.3), 2026
Maximum Temperature16.3 °C (-1.8)14:5620.5 °C (+0.7)22.9 °C (+4.8), 202415.2 °C (-2.9), 2015
Mean Temperature12.7 °C (-1.9)16.3 °C (+0.6)18.5 °C, 202412.7 °C, 2025
Minimum Humidity45%17:3857%79%, 201340%, 2026
Maximum Humidity82%07:4789%96%, 202382%, 2019
Mean Humidity66%76%88%, 202365%, 2019
Minimum Pressure1009 hPa00:021008 hPa1032 hPa, 2026996 hPa, 2023
Maximum Pressure1026 hPa22:581016 hPa1034 hPa, 2026998 hPa, 2023
Mean Pressure1019 hPa1012 hPa1033 hPa, 2026997 hPa, 2023
Mean Wind Speed4.3 mph (+0.4)6.1 mph (+2.2)10.6 mph, 20180.3 mph, 2020
Maximum Wind Speed18.3 mph00:0617.0 mph26.7 mph, 20185.5 mph, 2020
Maximum Gust28.8 mph00:5126.3 mph38.0 mph, 201810.4 mph, 2020
Mean Wind Direction20° [NNE]SWNW, 2021NNE, 2014
Rainfall0.0 mm48.8 mm (139%)7.4 mm, 20230.0 mm, 2009
Maximum Hourly Rainn/a1.9 mm4.3 mm, 20230.5 mm, 2011
Maximum 10-min Rainn/a1.1 mm2.4 mm, 20230.3 mm, 2011
Maximum Rain Raten/a20 mm/h42 mm/h, 20230.6 mm/h, 2011
Minimum Dew Point3.0 °C17:399.3 °C13.7 °C, 20243.0 °C, 2025
Maximum Dew Point8.4 °C00:3814.2 °C17.0 °C, 20248.4 °C, 2025
Mean Dew Point6.3 °C11.8 °C15.3 °C, 20246.3 °C, 2025
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)9.1 °C07:3312.6 °C14.7 °C, 20247.8 °C, 2026
Day Maximum (09-21)16.3 °C14:3220.5 °C22.9 °C, 202415.2 °C, 2015
Max 10m Temp Rise0.7 °C11:190.6 °C1.0 °C, 20260.2 °C, 2015
Max 1hr Temp Rise2.2 °C09:212.5 °C4.6 °C, 20260.5 °C, 2015
Max 1hr Hum Rise9%19:5912%19%, 20124%, 2013
Max 10m Temp Fall0.7 °C12:110.7 °C1.6 °C, 20180.2 °C, 2015
Max 1hr Temp Fall1.3 °C19:332.0 °C3.5 °C, 20180.8 °C, 2022
Max 1hr Hum Fall9%09:2111%18%, 20264%, 2013
Max 10m Wind Speed14.3 mph00:1412.7 mph18.4 mph, 20182.4 mph, 2020
Minimum Feels-like6.7 °C07:4913.5 °C17.9 °C, 20246.7 °C, 2025
Maximum Feels-like16.4 °C13:2123.3 °C27.6 °C, 202416.4 °C, 2025
Mean Feels-like12.7 °C18.5 °C22.7 °C, 202412.7 °C, 2025
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/an/a2.8 µg/m3, 20262.8 µg/m3, 2026
Maximum PM2.5n/an/a19.6 µg/m3, 202619.6 µg/m3, 2026
Mean PM2.5n/an/a9.7 µg/m3, 20269.7 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range7.2 °C (+0.2)8.0 °C15.1 °C, 20263.9 °C, 2015
Humidity Range37%32%47%, 200915%, 2013
Pressure Range17 hPa8 hPa22 hPa, 20182 hPa, 2011
ObservationDetail
Sun Hours9.5 hrs [85%]
Wet Hours0 hrs
Cloud Coverunknown
EventsNone
Comments-
Observer Absent?No
Pond Temperature16.0 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 21st September 2025. 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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