Guanacaste Sea Temperature in October

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

Average water temperature in Guanacaste for October

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

28.69° C

(83.63° F)

highest: 30.69° C (87.24° F)
lowest: 26.82° C (80.28° F)

This water temperature is comparable to that of a swimming pool, but it might be higher than most open water swimmers prefer for serious swimming. Make sure to drink plenty of water before and after swimming and don't wear a wetsuit to avoid overheating.

Water temperature range by day in October in Guanacaste

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

Water temperatures for October in Guanacaste in recent years

Day	2024	2023	2022	2021
1	0° C	30.23° C	29.39° C	29.19° C
2	0° C	30.02° C	29.4° C	29.09° C
3	0° C	29.88° C	29.44° C	29.15° C
4	0° C	30.21° C	29.37° C	29.17° C
5	0° C	30.45° C	29.25° C	29.09° C
6	0° C	30.47° C	29.03° C	28.97° C
7	0° C	30.52° C	28.85° C	28.95° C
8	0° C	30.6° C	28.84° C	28.82° C
9	0° C	30.34° C	28.89° C	28.96° C
10	0° C	30.12° C	28.63° C	29.1° C
11	0° C	30.14° C	28.43° C	29.08° C
12	0° C	30.13° C	28.37° C	28.9° C
13	0° C	30.13° C	28.14° C	28.75° C
14	0° C	30.08° C	28.26° C	28.68° C
15	0° C	29.91° C	28.21° C	28.76° C
16	0° C	30.13° C	28.24° C	28.82° C
17	0° C	30.26° C	28.34° C	28.95° C
18	0° C	30.03° C	28.33° C	28.93° C
19	0° C	29.98° C	28.44° C	28.46° C
20	0° C	29.96° C	28.51° C	28.33° C
21	0° C	30.02° C	28.51° C	28.12° C
22	0° C	30.03° C	28.6° C	28° C
23	0° C	29.91° C	28.7° C	27.98° C
24	0° C	29.86° C	28.61° C	28.07° C
25	0° C	29.56° C	28.57° C	28.04° C
26	0° C	29.53° C	28.63° C	28.21° C
27	0° C	29.47° C	28.5° C	28.19° C
28	0° C	29.56° C	28.61° C	28.59° C
29	0° C	29.39° C	28.63° C	28.63° C
30	0° C	29.24° C	28.58° C	28.61° C
31	0° C	28.96° C	28.43° C	29.04° C