Uccle is a weather station located 104 m above sea level, 1 km from Uccle. Its records go back to 1795: 231 years of temperature are available up to 2025, along with rainfall and a comparison with two reference normals. Over 1991–2020 the annual mean temperature there is 11.0 °C, clearly higher than over 1961–1990 (10.1 °C): a difference of 0.9 °C. The warmest year of the series is 2022 (12.2 °C) and the coldest 1879 (7.4 °C). The last complete year, 2025, ranks 4 out of 231, from warmest to coldest. Over 1961–2025, the annual mean temperature changes by +0.31 °C per decade. The station ranks 10 out of 12 stations, from the fastest rise to the slowest.
Annual mean temperature since 1795
The first ten years of the series (1795–1804) average 9.2 °C; the last ten (2016–2025) average 11.6 °C, a difference of +2.5 °C. All of the 10 warmest years in the series fall after 1999; the warmest is 2022 (12.2 °C). The ten-year running mean peaks at 11.6 °C (2025) and bottoms out at 8.9 °C (1888).
Annual rainfall since 1795
On average 791 mm of rain falls per year over the 128 documented years. The wettest year, 2021, received 1076 mm; the driest, 1921, only 407 mm, which is 2.6 times less. Over 1961–1990, June is on average the wettest month (78 mm) and February the driest (54 mm). Between 1988 and 2022, 10 years out of 20 exceeded the series average.
Monthly normals: 1961–1990 against 1991–2020
The table compares, month by month, the mean temperature and the rainfall total of two thirty-year reference periods. The difference column shows what the recent period changes compared with the earlier one.
| Month | Temp. 1961–1990 | Temp. 1991–2020 | Difference | Rain 1961–1990 | Rain 1991–2020 | Difference |
|---|---|---|---|---|---|---|
| January | 2.7 °C | 3.8 °C | +1.1 °C | 67 mm | – | – |
| February | 3.3 °C | 4.3 °C | +1.0 °C | 54 mm | – | – |
| March | 5.9 °C | 7.1 °C | +1.2 °C | 73 mm | – | – |
| April | 8.9 °C | 10.4 °C | +1.5 °C | 57 mm | – | – |
| May | 13.0 °C | 13.8 °C | +0.8 °C | 70 mm | – | – |
| June | 15.8 °C | 16.7 °C | +0.9 °C | 78 mm | – | – |
| July | 17.6 °C | 18.7 °C | +1.1 °C | 75 mm | – | – |
| August | 17.5 °C | 18.5 °C | +1.0 °C | 63 mm | – | – |
| September | 14.8 °C | 15.2 °C | +0.4 °C | 59 mm | – | – |
| October | 11.2 °C | 11.4 °C | +0.2 °C | 71 mm | – | – |
| November | 6.3 °C | 7.3 °C | +1.0 °C | 78 mm | – | – |
| December | 3.6 °C | 4.4 °C | +0.8 °C | 76 mm | – | – |
The largest temperature change is in April (+1.5 °C) and the smallest in October (+0.2 °C); over the year the mean difference is +0.9 °C, and 12 months out of twelve are warmer than before.
Records at Uccle
- Warmest year: 12.2 °C, in 2022
- Coldest year: 7.4 °C, in 1879
- Driest year: 407 mm, in 1921
- Wettest year: 1076 mm, in 2021
- Warmest month: 23.5 °C, in July 2006
- Coldest month: −6.2 °C, in February 1956
- Wettest month: 231 mm, in August 1996
- Hottest day: 39.7 °C, on 25 July 2019
- Coldest day: −21.1 °C, on 25 January 1881
- Heaviest rain in one day: 72.4 mm, on 10 July 1942
4.8 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 60.8 °C.
Temperature trend over 1961–2025
The regression line of annual mean temperature changes by +0.31 °C per decade between 1961 and 2025, about +2.0 °C over the whole period. That is slower than the median of the 12 stations (+0.36 °C per decade), by 0.05 °C per decade: the station ranks 10 out of 12.
The last 24 months against the 1991–2020 normal
Over the last 24 months (October 2024 to September 2026), 22 months out of 24 were warmer than the 1991–2020 normal for the same month; the mean departure is +1.3 °C. The highest departure was in June 2026 (+3.1 °C); the lowest, in January 2025 (−0.8 °C).
| Month | Temperature | Departure from normal | Rain | Normal rain |
|---|---|---|---|---|
| October 2024 | 12.6 °C | +1.2 °C | 68 mm | – |
| November 2024 | 7.5 °C | +0.2 °C | – | – |
| December 2024 | 5.3 °C | +0.9 °C | 79 mm | – |
| January 2025 | 3.0 °C | −0.8 °C | – | – |
| February 2025 | 4.3 °C | 0.0 °C | – | – |
| March 2025 | 8.3 °C | +1.2 °C | – | – |
| April 2025 | 12.3 °C | +1.9 °C | – | – |
| May 2025 | 14.7 °C | +0.9 °C | – | – |
| June 2025 | 19.4 °C | +2.7 °C | – | – |
| July 2025 | 19.5 °C | +0.8 °C | – | – |
| August 2025 | 19.4 °C | +0.9 °C | – | – |
| September 2025 | 15.5 °C | +0.3 °C | – | – |
| October 2025 | 12.0 °C | +0.6 °C | – | – |
| November 2025 | 8.4 °C | +1.1 °C | – | – |
| December 2025 | 6.3 °C | +1.9 °C | – | – |
| January 2026 | 4.0 °C | +0.2 °C | – | – |
| February 2026 | 7.4 °C | +3.1 °C | – | – |
| March 2026 | 9.9 °C | +2.8 °C | – | – |
| April 2026 | 11.8 °C | +1.4 °C | – | – |
| May 2026 | 15.5 °C | +1.7 °C | – | – |
| June 2026 | 19.8 °C | +3.1 °C | – | – |
| July 2026 | 20.9 °C | +2.2 °C | – | – |
| August 2026 | 20.2 °C | +1.7 °C | – | – |
| September 2026 | 17.4 °C | +2.2 °C | – | – |
Data source and licence
Data source: IRM/KMI via NOAA NCEI (dataset “GHCN-Daily + GHCN-Monthly v4 (qcu)”), licence Public domain (NOAA NCEI); original data: IRM/KMI. Last updated: 29 October 2026.
The data for Uccle are shown as the source publishes them; this site does not correct them. A year is kept only if at least eleven months of measurements are available, and a normal is computed only with at least twenty years of data out of its thirty. Temperatures are rounded to 0.1 °C and rainfall to the millimetre. The station is one of 12 stations in Belgium: the overview page lets you compare them.
Frequently asked questions
What is the annual mean temperature at Uccle?
Over 1991–2020, the annual mean temperature at Uccle is 11.0 °C. It was 10.1 °C over 1961–1990, a difference of +0.9 °C.
What is the warmest year ever measured at Uccle?
Since records began in 1795, the warmest year at Uccle is 2022, at 12.2 °C on average. The coldest is 1879 (7.4 °C).
Is the climate at Uccle getting warmer?
Yes: at Uccle, the annual mean temperature rises by 0.31 °C per decade between 1961 and 2025, +2.0 °C in total. 10 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations