In Brief:
Mostly fine for the first and final weeks. Unsettled for a time during week 2. Cloudy and wet third week, with very strong winds overnight 20th/21st. Temperatures a little lower than average, particularly at night.
Temperature: [Minimum]:
Lowest: 5.7 degs C on the 25th. Coldest September night since 2007.
Highest: 16.7 degs C on the 17th.
Average minimum: 11.89 degs C. 4th lowest of last 15 Septembers.
Nights with temperature below 5 degs C = 0.
Nights with temperature below 0 degs C = 0.
Temperature: [Maximum]:
Lowest: 14.2 degs C on the 23rd. 2nd coldest September day since before 2004. [Coldest = 16th, 2017].
Highest: 21.7 degs C on the 2nd.
Average maximum: 18.3 degs C. 3rd coolest of last 15, but 2nd warmest of last 4.
Days with temperature above 20 degs C = 4. =3rd fewest of last 15, but 2nd most of last 4.
Days with temperature above 25 degs C = 0. None in September since 2006.
Rainfall:
Total: 68.6 mm. Wettest month since April.
Equal driest September since 2015 but =5th wettest since before 2007.
August 2018: 63.6 mm.
September 2017: 152.6 mm.
Wettest day: 26.7 mm on the 22nd. Wettest day since April 1st.
Other days with more than 4 mm: 20th [23.7 mm].
Wettest spell: 20th to 22nd: 52.6 mm. [76.68% of month's total].
Driest spells: 24th to 30th: No measurable rain. 3rd to 10th: 0.4 mm.
Completely dry days: 14. Most for September since 2015.
Days with no measurable rain: 17. Most for September since 2015, fewest for any month since March.
Cumulatively: 2018 = 848.6 mm [2nd driest of the last 5 January to September totals, 4th wettest of the last 10].
2017: 817.9 mm. [+3.75%].
Thunder:
None this month.
Pressure:
Lowest: 1000.5 mb on the 20th.
Highest: 1044.4 mb on the 24th.
