Greenwich Sea Temperature in October

Looking to find out what the average sea water temperature in Greenwich is for October? Find out what the lowest, highest, and average water temperatures are for Greenwich over the past 10 years.

Average water temperature in Greenwich for October

The average, high, and low temperatures below should help you if you can swim in the water in Greenwich in October.

19.51° C

(67.12° F)

highest: 21.97° C (71.55° F)
lowest: 16.94° C (62.49° F)

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

Water temperature range by day in October in Greenwich

The chart below shows the range of low and high temperatures by day for the month of October in Greenwich.

Water temperatures for October in Greenwich in recent years

Day	2025	2024	2023	2022
1	0° C	19.04° C	19.28° C	18.25° C
2	0° C	18.95° C	19.44° C	18.28° C
3	0° C	18.95° C	19.35° C	18.45° C
4	0° C	19.13° C	19.27° C	18.69° C
5	0° C	19.17° C	19.19° C	18.79° C
6	0° C	19.28° C	19.15° C	18.63° C
7	0° C	19.36° C	19.15° C	18.71° C
8	0° C	19.51° C	19.17° C	18.79° C
9	0° C	19.08° C	19.17° C	18.82° C
10	0° C	19.04° C	19.23° C	19° C
11	0° C	19.08° C	19.22° C	18.95° C
12	0° C	19.01° C	19.29° C	18.96° C
13	0° C	18.97° C	19.39° C	18.91° C
14	0° C	18.89° C	19.58° C	18.94° C
15	0° C	18.9° C	19.75° C	19.04° C
16	0° C	19.05° C	19.95° C	19.16° C
17	0° C	19.29° C	20.07° C	19.31° C
18	0° C	19.59° C	20.09° C	19.34° C
19	0° C	19.67° C	20.02° C	19.49° C
20	0° C	19.81° C	20.07° C	19.5° C
21	0° C	19.98° C	19.9° C	19.52° C
22	0° C	20.11° C	19.93° C	19.54° C
23	0° C	20.27° C	20° C	19.51° C
24	0° C	20° C	19.96° C	19.45° C
25	0° C	19.83° C	19.83° C	19.51° C
26	0° C	19.73° C	19.97° C	19.65° C
27	0° C	19.78° C	20.19° C	19.71° C
28	0° C	19.91° C	20.23° C	19.89° C
29	0° C	20.05° C	20.32° C	19.78° C
30	0° C	20.2° C	20.53° C	19.63° C
31	0° C	20.39° C	20.63° C	19.31° C