Typical early Autumn Weather
Temperatures
The average maximum temperature during September 2021 in Horsholm was 18.6 Celsius, and that was normal for the time of year. The average minimum temperature was 9.7 Celsius, and that was less than a degree below the monthly normal.
The highest temperature recorded during the month was 24.7 Celsius on the 10th, but the maximum was 24.1 Celsius on the 9th, and only 2 out of the first 12 days of September had highs below 20 Celsius. After the 12th, there were no days with maxima above 20 Celsius, in fact, on 4 days the temperature failed to reach 15 Celsius. The cool days were the 19th, 20th and 21st, along with the 30th. The only 2 of those days with maxima below 14 Celsius were the 21st and 30th with highs of 12.5 and 13.1 Celsius respectively.
There were 2 warm nights during September. On the 11th, a minimum of 15.7 Celsius was recorded, with 15.1 Celsius occurring on the 8th. Although 14.4 Celsius was the minimum on both the 12th and 16th, there were only 9 other nights with minima above 10 Celsius. On most other nights the temperature fell to between 5 and 10 Celsius, but on 3 nights it was cooler. A minimum of 3.6 Celsius occurred on the 5th, with 4.9 and 4.6 Celsius measured on the 6th and 29th respectively.
Frost
No frosts were recorded during the month.
Rain
There were 50.2 millimetres of rain measured during September, which was about 10% below the monthly average. Rain fell on 13 days, which was 2 days below average. The first 10 days of the month were dry, but then the weather became unsettled. Initially, rainfall was light with falls of 0.4 and 1.0 millimetres on the 11th and 12th respectively. Following 2 dry days, 8.2 millimetres fell on the 15th, with over 2 millimetres falling on both the 16th and 17th. A drier interlude ended with 4.6 millimetres of rain measured on the 23rd, and although a couple of days of lighter rain followed, the end of the month was wet. The last 4 days of September produced 60% of the monthly total. On the 28th, 8.6 millimetres of rain fell, with 13.4 millimetres on the 29th. The last day of the month added another 4.4 millimetres to the total.
Hail
No hail was observed in this part of Horsholm.
Thunder
There was no thunder in this part of Horsholm.
Snow
No sleet or snow was observed in this part of Horsholm.
Wind
Winds were mainly between southeast and southwest during September, with breezes having a northerly component accounting for less than 25% of the monthly total. During the first 2 weeks of the month, winds were mostly light, but moderate or fresh winds sometimes occurred after mid-month, and on the 23rd the wind was strong for a while with minor tree damage noticed.
Fog
There was no fog observed in Horsholm during the month.