Key Points
- The Netherlands recorded its warmest-ever September 29, according to NL Times.
- Eindhoven reached 28.6°C, exceeding the previous nationwide September 29 record of 28.0°C set in Winterswijk in 1934.
- Maastricht reached 28.1°C earlier in the day, also surpassing the previous national record.
- De Bilt recorded 25.9°C at 3:30 p.m., breaking the previous September 29 record of 25.4°C set there in 1934.
- The De Bilt observation is significant because the location is used for the Netherlands’ long-running official temperature record.
- Weatheronline forecast another unusually warm day for September 30, with temperatures of 23–26°C across much of the country and potentially 26–28°C in eastern and south-eastern areas.
- The September 30 nationwide temperature record cited by NL Times is 26.7°C, while De Bilt’s record for that date is 24.3°C.
- Later reporting indicated that September 2026 finished among the warmest Septembers recorded at De Bilt, with an average temperature of about 16.8°C.
Amsterdam Times News (ATN) September 29, 2026 – The Netherlands experienced an exceptional late-September warm spell on Tuesday, with Eindhoven reaching 28.6°C and De Bilt recording 25.9°C, setting new temperature records for September 29. According to NL Times, the Eindhoven temperature was the highest recorded anywhere in the Netherlands on that date, while the De Bilt reading established a new official record for the date at the national reference station. Maastricht also reached 28.1°C earlier in the day, surpassing the previous nationwide September 29 high of 28.0°C recorded in Winterswijk in 1934.
How did Eindhoven break the Dutch September 29 temperature record?
Eindhoven recorded the highest temperature reported in the Netherlands on September 29, reaching 28.6°C. The reading exceeded the previous nationwide record for the date by 0.6°C.
As reported by NL Times, Maastricht had already reached 28.1°C earlier on Tuesday. That temperature was itself above the previous nationwide September 29 record of 28.0°C, which had stood since 1934 and was measured in Winterswijk.
The subsequent rise in Eindhoven meant that the old record was surpassed twice during the same day. The progression from Maastricht’s 28.1°C to Eindhoven’s 28.6°C demonstrated how broadly the warm conditions affected parts of the Netherlands rather than being limited to one isolated observation.
The significance of the Eindhoven figure is specifically tied to the calendar date. Temperature records are frequently maintained for individual days, allowing meteorological services and weather organisations to compare a day’s conditions with observations from the same date in previous years.
The 28.6°C reading therefore represents a new September 29 high for the Netherlands based on the information reported on Tuesday.
Why was the De Bilt temperature record important?
De Bilt reached 25.9°C at approximately 3:30 p.m., according to NL Times. That broke the previous September 29 record at the location, which was 25.4°C in 1934.
De Bilt has particular importance in Dutch meteorology because it is the country’s principal reference location for long-term national climate measurements. The available historical weather data for De Bilt extend back to 1901. Current weather statistics confirm a maximum temperature of 25.9°C for September 29, 2026, with the historical comparison showing 25.4°C as the previous maximum for the date.
The distinction between the Eindhoven and De Bilt records is important. Eindhoven’s 28.6°C was the highest temperature reported anywhere in the Netherlands for September 29, while the 25.9°C measurement at De Bilt established the official date record at the country’s long-term reference station.
The two measurements therefore describe different aspects of the same weather event.
What was the previous September 29 record?
The previous nationwide September 29 high was 28.0°C, recorded in Winterswijk in 1934. Both Maastricht and Eindhoven exceeded that value on September 29, 2026.
At De Bilt, meanwhile, the previous September 29 record was 25.4°C, also recorded in 1934. The new reading of 25.9°C was therefore 0.5°C higher than the previous De Bilt record.
Historical data from the De Bilt weather record confirm the 1934 benchmark. The recorded maximum for September 29 before the 2026 event was 25.4°C.
The fact that the previous records at both locations dated from the same year provides a clear historical comparison. However, the new records should be understood specifically as date records, rather than as records for the entire month of September.
September has seen considerably higher temperatures on other dates. The new September 29 figures do not, by themselves, establish a new all-time Dutch September temperature record.
What temperatures were forecast for September 30?
The warm conditions were expected to continue into Wednesday, September 30.
According to Weatheronline, as cited by NL Times, most of the Netherlands was expected to experience temperatures of roughly 23–26°C. Eastern and south-eastern parts of the country could see temperatures between 26°C and 28°C.
Those forecasts created another possibility for a date-specific temperature record.
NL Times reported that the existing nationwide high for September 30 was 26.7°C, while the highest temperature recorded in De Bilt on September 30 was 24.3°C.
This meant that temperatures at the upper end of the forecast range could potentially challenge the September 30 records. A forecast, however, is not itself a recorded temperature record. The actual measurements would determine whether another daily record was established.
What do the De Bilt records show about September 2026?
The late-month heat occurred during a September that was already running warmer than the long-term average.
Weather statistics based on KNMI data show that De Bilt recorded a maximum of 25.9°C on September 29. The same dataset gives a September 2026 average of about 16.7°C at the time of the data update, compared with a normal September average of 14.7°C.
Subsequent reporting after the month ended put the September 2026 average at approximately 16.8°C at De Bilt. NL Times reported that this made September 2026 the sixth-warmest September since records began in 1901, behind September months in 2006, 2023, 1999, 2016 and 1949.
The KNMI’s own historical September table lists 2006 as the warmest September at De Bilt, with an average temperature of 17.9°C, followed by 2023 at 17.5°C, 1999 at 17.4°C, 2016 at 17.3°C and 1949 at 16.9°C.
This wider monthly context shows that the September 29 record was part of a broader period of above-average temperatures during September 2026.
What were the conditions at De Bilt on September 29?
The detailed De Bilt observations provide further information about the day.
Weather statistics based on KNMI data record a minimum temperature of 15.7°C and a maximum of 25.9°C on September 29. The average temperature for the day was 19.6°C. The same data show approximately 7.1 hours of sunshine and less than 0.05 millimetres of precipitation.
The prevailing wind direction was east-south-east, with an average wind speed of 3.0 metres per second. The highest recorded wind gust was 8.0 metres per second.
These figures help place the record maximum within the overall weather conditions at the country’s principal reference station. The record was not simply the result of a brief isolated temperature reading; the day as a whole was substantially warmer than the normal September conditions shown in the same dataset.
How unusual was the temperature compared with normal September weather?
The difference from normal September conditions was substantial.
The long-term September average at De Bilt is around 14.7°C under the 1991–2020 climate normal. The 2026 September average was therefore around two degrees higher once the final monthly figure of approximately 16.8°C was recorded.
The normal maximum temperature for September is also considerably below the 25.9°C reached at De Bilt on September 29. Historical weather data show that the September 29 temperature record had remained at 25.4°C since 1934 until the 2026 observation.
It is therefore the combination of the late calendar date and the elevated temperatures that makes the event notable.
At the same time, the available figures do not establish that September 29 was the hottest day ever recorded in the Netherlands. They establish a new record specifically for September 29.
What happened to September’s overall weather statistics?
The final figures reported after September ended provide a broader picture of the month.
NL Times reported on September 30 that the average temperature at De Bilt was approximately 16.8°C, compared with a usual September average of 15°C in the source’s comparison. It described September 2026 as the sixth-warmest September since measurements began in 1901.
Another report published on September 30 stated that the Netherlands ended the month with two unusually late summer-like days and daily temperature records. It also reported that average September rainfall nationally was around 66 millimetres against a normal 76 millimetres, while sunshine totalled approximately 171 hours compared with a normal 169 hours.
The different datasets use different reference periods and reporting conventions, so monthly figures should be read in their stated context. The key point is that the final September data continued to show temperatures above the long-term average.
What does the September 29 record mean for people in the Netherlands?
For residents, commuters and visitors, the immediate effect of the record was an unusually warm day at a time of year when temperatures normally begin moving towards autumn conditions.
The temperature difference can influence everyday activities such as clothing choices, outdoor work, travel and recreational plans. However, the precise effect varies by location because Eindhoven’s 28.6°C was considerably higher than the 25.9°C recorded at De Bilt.
The forecast for September 30 indicated that warm conditions would persist, particularly in the east and south-east. Weatheronline’s forecast, as reported by NL Times, placed potential temperatures in those areas as high as 28°C.
For people making plans around the weather, the distinction between recorded observations and forecasts remains important. The September 29 records were based on measurements, while the September 30 figures cited ahead of the day were forecasts.
What is the background to the Dutch September temperature records?
The Netherlands has a long history of systematic weather observations, with the De Bilt series extending back to 1901. KNMI maintains historical climate information for the location, making it an important reference point for comparisons across decades.
Daily records provide one way of assessing unusual weather by comparing the maximum or minimum temperature on a particular calendar date across the historical record.
The September 29 event involved two different records. Eindhoven established the highest temperature reported anywhere in the country for that date, while De Bilt established a new maximum for September 29 at the official reference station. Maastricht’s 28.1°C also exceeded the previous nationwide September 29 record of 28.0°C.
The historical records broken on September 29 had remained in place since 1934. That gives the 2026 measurements a clear historical comparison, without implying that the day’s temperature exceeded every September temperature ever recorded.
What could the development mean for Dutch residents and weather-dependent sectors?
The immediate outlook described by Weatheronline suggested that unusually warm conditions could continue into September 30, with 23–26°C expected across much of the Netherlands and potentially 26–28°C in the east and south-east.
For residents, the practical effect is likely to be another day with temperatures more typical of warmer periods than the end of September. Outdoor activities and travel could therefore take place under conditions different from those normally associated with the final days of the month.
For weather-dependent businesses and outdoor workers, actual local temperatures will remain more relevant than the national record because conditions varied between Eindhoven, Maastricht, De Bilt and other parts of the Netherlands.
The wider September statistics also indicate that the warm spell formed part of a month that finished considerably warmer than the long-term average at De Bilt.
Any longer-term interpretation would require analysis beyond the individual daily record. The September 29 figures establish what happened on that date; they do not, on their own, determine future weather patterns.
Source and attribution note: The principal report used here is the September 29 article published by NL Times. The article does not display an individual journalist byline in the accessible version, so no author name has been attributed or invented. Its report cites Weatheronline for the September 30 forecast. Historical measurements were cross-checked against weather statistics based on KNMI data.
