September 2021 was warmer than average (15.51°C versus an average of 13.39), drier than average (39.80 mm versus an average total of 41.20) and calmer than average (a wind run of 1516 miles versus an average of 2206).
The month was the warmest September ever recorded here. At 16:25 on the 7th, the temperature reached 29.7°C, the highest temperature since 29.8°C was recorded on July 22nd 2021. This was the highest temperature ever recorded here in September. Temperatures were well above average at 15.5°C, 0.2°C above the September best and 1.9°C above the monthly mean. The average daily high temperature was 20.3°C, 2.3°C above the mean. The daily low average was 11.5°C, 1.8°C above the mean..
The warmest day was the 8th with an average temperature of 21.9°C, with the coolest day being the 29th with an average temperature of 9.2°C. The lowest temperature in the month was also on the 29th when the temperature fell to 6.2°C at 21:49. The sunniest day was the 8th with 9.08 hours.
Rainfall in the month was 39.8 millimetres recorded on 13 days, 1.7 millimetres above the monthly mean. The yearly total was 449.4 millimetres, 111% of the average for the end of September. The wettest day was the 9th with 10.8 millimetres. The highest rain rate of 153.6 millimetres per hour was recorded at 17:44 on the 9th.. There was no snow recorded in the month.
The highest barometric pressure of 1032.5 millibars was at 01:02 on the 1st. The lowest pressure was 995.1 millibars at 08:14 on the 27th. The average pressure in the month was 1016.3 millibars. The highest humidity was 96% and the monthly average humidity was 85%. The lowest humidity was 43% at 15:00 on the 20th.
Wind speeds were again lower than average, with the highest wind gust speed of 24 mph being recorded at 15:44 on the 30th. The maximum wind speed was 12 mph at 15:07 on the 27th. The wind run was 1516.4 miles, 805.5 miles below the average for the month. The average gust speed in the month was 3.8 mph, and the average wind speed was 2.2 mph. The predominant direction was southerly (190°).
The maximum high solar radiation recorded at 12:44 on the 9th was 949 w/m². The average solar radiation for the month was 115 w/m². The highest U.V. Index was 3.6 recorded at 13:25 on the 6th.