Very Wet
Temperatures
The average maximum temperature during September 2022 in Shoreham was 20.4 Celsius (69F), and that was less than 0.5 Celsius (<1F) above normal for the time of year. The average minimum temperature was 12.1 Celsius (54F), and that was average for September.
The highest temperature recorded during the month was 25.8 Celsius (78F) on the 1st. The temperature reached 25.1 Celsius (77F) on the 2nd, and highs exceeding 24 Celsius (75F) occurred on the 4th, 5th and 12th. A further 4 days had maxima above 22 Celsius (72F), with all of these warmer days occurring before the 13th. Temperatures also topped 20 Celsius (68F) on the 10th, 14th, 19th, 21st and 22nd. There were no particularly cool days during September, but on 8 occasions the temperature failed to reach 8 Celsius (64F). The 16th had a maximum of 17.9 Celsius (64F), but the remainder of these less warm days occurred after the 22nd. On 3 of these days, the temperature stayed below 17 Celsius (63F) with highs of 16.2 Celsius (61F), 16.7 Celsius (62F) and 16.5 Celsius (62F) on the 26th, 27th and 28th respectively.
There were several pleasantly warm nights during September, and on 10 occasions, all before mid-month, the temperature stayed above 15 Celsius (59F). On 2 of these nights the temperature remained above 17 Celsius (63F). On the 4th, a low of 17.4 Celsius (63F) occurred, with 17.9 Celsius (64F) recorded on the 13th. During the first half of September, the lowest minimum was 12.2 Celsius (54F) on the 12th, but nights were generally much cooler after mid month, with only 1 night, the 23rd with a low of 14.1 Celsius (57F), having a minimum temperature above 12.2 Celsius (54F). and on 10 nights the temperature dipped below 10 Celsius (50F). Minima below 7 Celsius (45F) occurred on 3 of these nights, with lows of 4.9 Celsius (41F), 4.7 Celsius (40F) and 5.2 Celsius (41F), on the 17th, 29th and 30th respectively.
The sea temperature was around 21 Celsius (70F) at first, steadily descending to 17 Celsius (63F) by the end of the month.
Frost
There was no frost in Shoreham during September. The lowest grass temperature was 1.1 Celsius (34F), recorded on the 17th.
Rain
Rainfall in September amounted to 118.6 millimetres (4.7 ins.), which was more than double the average for the month. It was the wettest September in the area for 22 years. Measurable rain fell on 14 days, which was 2 days above the average, and wet days (when 1 millimetre (0.04 ins.), or more, of rain falls) numbered 12, which was 4 days above the average. A total of 8 millimetres (0.3 ins.) of rain fell on the evening of the 1st, and although the following 2 days were largely dry, a spell of very wet weather ensued. Between the 4th and 8th (5 days) almost 65 millimetres (2.5 ins.) of rain fell, and included daily totals of 31.6 millimetres (1.2 ins.) on the on the 7th, and 17.6 millimetres (0.7 ins.) on the 8th. After 3 mainly dry days, light rain on the 12th was followed by 11 millimetres (0.4 ins.) on the 13th. No measurable rain fell between the 15th and 21st, but although the second half of September was drier than the first half, there were 6 millimetres (0.25 ins) of rain on the 22nd, another 10 millimetres (0.4 ins.) on the 23rd, and the month ended with 13 millimetres (0.5 ins.) on the 30th.
Hail
No hail was observed in this part of Shoreham.
Thunder
Thunderstorms occurred on 5 days during September. Showers turned thundery for a while on the evening of the 1st, and there was quite intense thunder and lightning during the evening of the 4th. Although these storms moved away soon after midnight, further storms broke out during the evening of the 5th. Thunderstorms occurred mid-evening on the 7th and 1 rumble of thunder was heard mid-morning on the 8th.
Snow
No sleet or snow occurred in Shoreham.
Wind
Pressure was lower than average across Britain, but winds were not particularly strong, except occasionally during the second and last weeks of the month. Southeasterly winds were absent, with breezes from the northwest and southwest quadrants dominant, although a few days with northeasterly winds occurred early in the month. At Shoreham Airport, a southwesterly gust of 30 knots (34 mph) occurred in association with thunderstorms around midnight on the 5th, and early in the evening of the 6th, there was southwesterly gust of 41 knots (47 mph). The 8th was a breezy day with gusts in the afternoon peaking at 33 knots (37 mph). No further gusts above 30 knots (34 mph) occurred until the evening of the 30th, when several gusts from the southwest reached 40 knots (46 mph).
Fog
No fog was observed in this part of Shoreham.
Statistics for September 2022
| Reporting Site | Highest Temp | Lowest Temp | Rain Total (mm) | Wettest | Rain days |
| Shoreham A/P | 26.1 | 2.6 | 158 | 37 | 13 |
| Thorney Island | 25.2 | 4.5 | 157 | 43 | 15 |
| Gatwick A/P | 26.1 | 1.1 | 182 | 52 | 15 |
| Herstmonceux | 26.7 | 3.3 | 210 | 50 | 17 |
| Bournemouth (Hurn) | 25.2 | 1.1 | 81 | 16 | 12 |
| Middle Wallop | 26.0 | 3.5 | 72 | 21 | 12 |
| Dieppe | 27.9 | 5.9 | 44 | 8 | 17 |