September 2026 was the 5th warmest on record and the 18th driest September on record. This continued the warm theme of 2026 and also the below average overall rainfall trend for the year.
Most of September was a pleasant month overall without any warm surges that we had seen over the previous months. Indeed they were limited a single day when it turned hot on the 22nd with 26.2C the high comfortably the hottest day of the month. Most of the month the temperatures were the lower twenties and upper teens so some maybe surprised by how much above average the month was overall. After the 26th the next warmest day was the 14th when 24.3C was the high. This day featured the warmest day as well with 16.1C being the overnight low. Overall the month saw night time temperatures mostly in the low to mid teens. The month did feature a few nights in single digit figures. The first of these was also the coolest night of the month when 7.5C was the low on the 10th. Single digits were recorded on the 12th, 21st,24th, 26thand 27th. The 24th and 26th were the 2nd and third coldest night at 7.6C and 7.7C respectively. Milder conditions stopped any more single digit nights until the 30th. The coolest day was the 18th when the temperature only reached 16.4C with the next coolest on the 25th when 16.5C was the high. Overall the month didn't show a lot of variation through out the month. On the 29th very mild air was late in arriving at the region so didn't push the average figure up at all. Indeed there was a fall for the 30th.
September just sneaked into the top twenty driest months on record. This time no large amounts of rain fell late in the month to prevent it from being one the driest.The wettest day was the 2nd when 8.2mm fall and the next wettest was the 18th with 6.4mm. There was a run from the 20th to the 28th where no measurable rain was recorded. This ended with unforecast light rain and drizzle on the 28th adding a small 1.2mm while another further unforecast rain fell overnight on the 30th adding another 1.4mm to the overall final amount. Models over all again struggled with predicting rainfall amounts with high amounts forever being pushed back outside the reliable time frame.
September was another quiet month without any windy weather. Windy weather for the 29th didn't materialise either although the way the presenters were talking it was windy everywhere which wasn't the case.
The month was again free from any Thunderstorm activity continuing the trend of declining Thunderstorm activity across the UK.
October looks start with high pressure generally influencing matters from the west and south. Rainfall to be generally small as the high pressure kills any fronts crossing the region. Temperatures set to be above normal for the time of year and it's only towards the middle of the month when temperatures trend towards average and possibly below by mid month as cooler air pushes down from the NW. At this time of year with high pressure in control there's a risk of overnight mist and fog and slight chance of a ground frost. High pressure is located more to the E after mid month allowing a mild southerly draw and again keeping rainfall amounts low as the Atlantic runs into the block. Towards the end of the month the block moves further E allowing low pressure to sit over the country. The month looks to be another mild month, possibly very mild with below average rainfall.
| Septembers Averages, Highs and Lows | ||
|---|---|---|
| Average Temp 14.0C | Last Months Average 15.6C | Difference from average 1.6C |
| Average Max Temp 18.1C | Last Months Average 19.7C | Difference from average 1.6C |
| Average Min Temp 9.8C | Last Months Average 11.6C | Difference From Average 1.8C |
| High Max 26.2C on the 22nd | Low Max 16.4C on the 18th | Highest Daily Range 13.1C on the 22nd |
| High Min 16.1C on the 14th | Low Min 7.5C on the 10th | Lowest Daily Range 2.9C on the 23rd |
| Number of Air Frosts 0 | Days of Thunder 0 | Days of Snow 0 |
| Days of Measurable Rain 15 Days | Days of Rain with trace 8 Days | Days with Gusts ≥ 50 mph 0 days |
| Average Rainfall 65.8mm | This Months Average 30.8mm | Percentage of Average Rainfall 46.8% |