How warm is it in San Juan in October?

Daytime highs averaged 30.1 °C, night-time lows 26.6 °C. The highest value of the past 10 years was 33.4 °C (11 Oct 2024), the lowest 24.7 °C (1 Oct 2017).

How often does it rain in San Juan in October?

On average there were 23.8 rain days (at least 1 mm) with 197 mm of precipitation in total.

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San Juan weather in October: temperature & rain

Photo: P. Hughes · CC BY-SA 4.0

🇵🇷 Weather in San Juan in October

This is what the weather in San Juan (Puerto Rico) was like in October over the years 2016–2025.

Key facts at a glance

Prevailing weather: Light rain

Avg. daytime high

30.1 °C

28.7 °C – 31.6 °C

Avg. night-time low

26.6 °C

25.8 °C – 27.5 °C

Avg. rain days in period

23.8

77 % of days · ≥ 1.0 mm

Avg. precipitation in period

197 mm

83.1 mm – 275 mm

Avg. cloud cover

69 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

–

Sea temperature unavailable for today (daily limit).

Extremes: Highest temperature 33.4 °C (11 Oct 2024) · Lowest temperature 24.7 °C (1 Oct 2017) · Avg. daily peak wind 17 km/h

Weather mix of all days

65Partly cloudy
7Cloudy
126Light rain
112Rain

Summary

On average 30.1 °C during the day and 26.6 °C at night.
On average 23.8 rain days (Rain day = at least 1.0 mm of precipitation) with 197 mm of precipitation in total.
Prevailing weather: Light rain.
Warmest year: 2024 (avg. 31.6 °C), coolest: 2018 (avg. 28.7 °C).
Wettest year: 2025 (275 mm), driest: 2019 (83.1 mm).
Extremes: 33.4 °C on 11 Oct 2024 and 24.7 °C on 1 Oct 2017.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2025
Avg. max30.3°Avg. min27.0°
Rain days
26 Rain days
Precipitation
275 mm
Avg. cloud cover
77 % cloudy
Sea temperature
–
Max 32.4 °C · Min 26.6 °C
2024
Avg. max31.6°Avg. min27.5°
Rain days
23 Rain days
Precipitation
261 mm
Avg. cloud cover
68 % cloudy
Sea temperature
–
Max 33.4 °C · Min 25.2 °C
2023
Avg. max31.2°Avg. min27.5°
Rain days
22 Rain days
Precipitation
189 mm
Avg. cloud cover
72 % cloudy
Sea temperature
–
Max 32.8 °C · Min 26.3 °C
2022
Avg. max29.5°Avg. min26.2°
Rain days
25 Rain days
Precipitation
202 mm
Avg. cloud cover
64 % cloudy
Sea temperature
–
Max 30.8 °C · Min 25.2 °C
2021
Avg. max30.1°Avg. min26.6°
Rain days
21 Rain days
Precipitation
125 mm
Avg. cloud cover
65 % cloudy
Sea temperature
–
Max 31.1 °C · Min 25.5 °C
2020
Avg. max30.0°Avg. min26.5°
Rain days
24 Rain days
Precipitation
142 mm
Avg. cloud cover
68 % cloudy
Sea temperature
–
Max 31.2 °C · Min 25.9 °C
2019
Avg. max30.7°Avg. min26.6°
Rain days
22 Rain days
Precipitation
83.1 mm
Avg. cloud cover
65 % cloudy
Sea temperature
–
Max 31.7 °C · Min 26.0 °C
2018
Avg. max28.7°Avg. min25.8°
Rain days
22 Rain days
Precipitation
247 mm
Avg. cloud cover
70 % cloudy
Sea temperature
–
Max 30.5 °C · Min 24.9 °C
2017
Avg. max28.9°Avg. min25.9°
Rain days
22 Rain days
Precipitation
229 mm
Avg. cloud cover
68 % cloudy
Sea temperature
–
Max 30.2 °C · Min 24.7 °C
2016
Avg. max29.8°Avg. min26.4°
Rain days
31 Rain days
Precipitation
221 mm
Avg. cloud cover
74 % cloudy
Sea temperature
–
Max 31.1 °C · Min 25.7 °C

Frequently asked questions

How warm is it in San Juan in October?: Daytime highs averaged 30.1 °C, night-time lows 26.6 °C. The highest value of the past 10 years was 33.4 °C (11 Oct 2024), the lowest 24.7 °C (1 Oct 2017).
How often does it rain in San Juan in October?: On average there were 23.8 rain days (at least 1 mm) with 197 mm of precipitation in total.

Check your exact travel dates

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Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)