A dry and mild month
Temperatures
The average maximum temperature during October 2017 in Shoreham was 16.3 Celsius (61F), and that was over 1 Celsius (1.8F) above normal for the time of year. The average minimum temperature was 10.9 Celsius (52F), and that was also more than 1 Celsius (1.8F) above the normal October value.
The highest temperature recorded during the month was 19.8 Celsius (68F) on the 16th. This was the day of the orange sun and day darkness caused by Saharan dust and smoke from Iberian forest fires spreading north in the southerly airstream. The 16th was the only day with a maximum temperature above 19 Celsius (66F), however, there were 6 other days when maxima exceeded 18 Celsius (64F). On most days (20) the temperature rose to between 15 and 18 Celsius (59-64F), but there were a few cooler days later in the month. The 22nd was the first of these less mild days with a high of 13.8 Celsius (57F). This was the second coolest day of the month. There were 3 other days when the temperature failed to reach 15 Celsius (59F), but only 1 of those days had a maximum below 14 Celsius (57F), that was the 30th, with a high of 11.4 Celsius (52F), the coolest day of the month.
There were many mild nights during October, and on 10 nights the temperature remained above 13 Celsius (55F). On 7 of these milder nights the minima were 14 Celsius (57F) or higher. The mildest nights were both the 14th and 19th when lows of 14.8 Celsius (59F) were recorded. There were 12 nights when the temperature fell below 10 Celsius (50F), but only 3 of these cooler nights had minima under 7 Celsius (45F). The end of the month was coolest with 3 out of the last 4 nights recording temperatures below 5 Celsius (41F). The coolest night was the 30th with a reading of 3.2 Celsius (38F).
The sea temperature, around 17 Celsius (63F) at the beginning of October, fell slowly to 14 or 15 Celsius (57-59F) by the end of the month.
Frost
There were no frosts in Shoreham during October. The lowest grass minimum was 0.0 Celsius (32F) on the 28th.
Rain
There were 30.4 millimetres (1.2 ins.) of rain during October, and that was less than 50% of the average. Rain fell on 15 days, about 2 days above what one would expect at this time of year, and wet days ( rainfall of 1 millimetre (0.04 ins) or more) amounted to 9 days. The first half of the month was generally dry, and although measurable rain fell on 6 days, the total was only 6.8 millimetres (0.3 ins.) between the 1st and 16th. Rain then fell on the following 9 days with 9.2 millimetres (0.36 ins.) recorded on the 19th and 5.6 millimetres (0.22 ins.) collected on the 20th. Most of the rain was then light, and during the last 6 days of October there was no measurable rain.
*A rain day is from 0900-0900 UTC
Hail
There was no hail reported in Shoreham during October.
Thunder
There was no thunder reported in Shoreham during October.
Wind
October was another ‘westerly’ month with well over half of winds blowing from between southwest and northwest. It was often quite breezy early in the month, and again during the unsettled spell, but it became generally less windy towards the end of October. At Shoreham Airport, a gust of 42 knots (48 mph) was recorded in the early hours of the 20th, with 45 knots (51 mph) measured during the afternoon on the following day.
Fog
There was no fog observed in this part of Shoreham during October except for a while in the evening and overnight on the 25th/26th.
Statistics for October 2017
| Reporting Station | Highest Temp | Lowest Temp | Rain Total (mm) | Wettest | Rain days |
| Shoreham Airport | 20.0 | 0.9 | 39 | 9 | 19 |
| Thorney Island | 18.8 | 3.1 | 38 | 9 | 18 |
| Gatwick Airport | 21.4 | 0.8 | 34 | 8 | 17 |
| Herstmonceux | 21.5 | 4.1 | 39 | 10 | 17 |
| Bournemouth (Hurn) | 19.3 | -1.4 | 46 | 11 | 17 |
| Middle Wallop | 19.1 | 1.2 | 36 | 8 | 13 |
| Dieppe | 24.4 | 6.3 | 48 | 22 | 15 |
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