September 2020 was warmer than average (13.62°C versus an average of 13.37), drier than average (15.20 mm versus an average total of 43.80) and calmer than average (a wind run of 2079 miles versus an average of 2218).
The month was very warm until the last third when the temperatures tailed off. The highest temperature was 27.7°C recorded at 16:40 on the 15th. This was the third highest September temperature recorded here, and the highest September temperature since 28.4°C was recorded on September 13th 2016. The lowest temperature was recorded at 06:47 on the 28th when the thermometre fell to 2.3°C, the lowest September temperature ever recorded here. The average temperature for the month was 13.6°C, 0.2°C below the September average.. The average daily high temperature was 18.5°C, with the average daily low being 9.1°C. The warmest day was the 15th with an average temperature of 20.1°C and the coldest day was the 24th with an average temperature of 8.9°C.
The average wind chill in the month was 13.5°C and the average dew point was 10.4°C. The high dew point was 19.7°C recorded at 13:38 on the 8th. There were 159.48 hours of sunshine, 25.7 hours below the September average. The sunniest day was the 14th with 8.73 hours
Rainfall in the month totalled 15.2 millimetres, second lowest only to the 10.0 millimetres recorded in 2014. Rainfall was recorded on 10 days, with no snow. The yearly total is now 425.6 millimetres, 104% of the normal for the end of September. The wettest day was the 30th with 3.0 millimetres of rain being recorded. The highest rain rate was 9.6 millimetres per hour, recorded at 00:12 on the 29th.
Wind speeds were below average, with the highest wind gust speed of 24 mph being recorded at 16:27 on the 11th.. The maximum wind speed was 11 mph at 15:44 on the 25th. The wind run was 2078.5 miles, 310.7 miles below the September average. The average gust speed in the month was 4.7 mph, and the average wind speed was 2.9 mph. The predominant direction was south south-westerly (208°).
The maximum high solar radiation recorded at 13:51 on the 3rd was 990 w/m². The average solar radiation for the month was 130 w/m². The highest U.V. Index was 4.4.