London/Heathrow Intl
Weather station · 51.5°N 0.5°W · 26 m above sea level
ICAO EGLLWMO 03772Station data since 1973
Record high
25.0°C
in 1978
Record low
4.0°C
in 1979
Average high
18.5°C
all years on record
7.0°C short of the record for 23 September
Today’s high 18.0°C against 25.0°C in 1978. A reading that beats it is flagged here automatically, once a second cycle confirms it.
All-time record high
40.2°C
- Date
- Tuesday, 19 July 2022
- Time of day
- Not recorded. The daily archive stores the day, not the hour.
- Location
- London/Heathrow Intl, United Kingdom
- Position
- 51.48°N 0.46°W · 26 m
Highest highest in available records since 1973. Source: NOAA GHCN-Daily.
All-time record low
−12.0°C
- Date
- Sunday, 13 December 1981
- Time of day
- Not recorded. The daily archive stores the day, not the hour.
- Location
- London/Heathrow Intl, United Kingdom
- Position
- 51.48°N 0.46°W · 26 m
Highest and lowest lowest in available records since 1973. Source: NOAA GHCN-Daily.
Where London/Heathrow Intl is
51.48°N 0.46°W
London/Heathrow Intl
Ground · satellite
Land surface temperature for 2026-09-22, from NASA GIBS. This is the temperature of the ground seen from orbit, not the air, and it is never ranked against air readings. Cloud hides the ground, so gaps are unread rather than guessed.
View more on Google Maps- 1
Today is already hotter than 60% of all days recorded here since 1973.
From our dataToday's high against every day recorded at this station since 1973. - 2
Between its coldest night and its hottest day, this place has swung 52.2°C.
From our dataRecord high 40.2°C against record low −12.0°C. - 3
At 05:20 UTC this morning it was 15.0°C. By 00:20 UTC it was 18.0°C. The night never stood a chance.
From our dataToday so far at this station, in local time.
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Every year on record
1973 to 2025
Annual average · °C
Trend over 18 years with data: +0.54 °C per decade
Source: NOAA GHCN-Daily. Years the station did not cover are left as gaps, never joined across. The dashed line is a least squares trend through the years that have data.
Records by month
Jan
15.7°
−9.0°
Feb
18.6°
−9.6°
Mar
22.8°
−5.1°
Apr
27.4°
−2.4°
May
29.4°
−4.6°
Jun
35.0°
2.9°
Jul
40.2°
6.7°
Aug
37.9°
0.0°
Sep
33.0°
Recent days
| Day | High | At | Low | At |
|---|---|---|---|---|
| 2026-09-23 | 18.0°C | 00:20 UTC | 15.0°C | 05:20 UTC |
| 2026-09-22 | 26.0°C | 15:20 UTC | 19.0°C | 22:50 UTC |
Nearby stations
Data sources for this page
| Figure | Source | Type |
|---|---|---|
| Right now, today so far | NOAA Aviation Weather Center (METAR) and NOAA NWS WMO bulletins (SYNOP) | Measured, station |
| All-time, monthly and on-this-day records | NOAA NCEI Global Historical Climatology Network daily (GHCN-Daily), 1973 to 2025 | Measured, station |
| Nearby stations and distances | Computed from station positions in our own database | Calculated |