How warm is it in San Juan in July?

Daytime highs averaged 30.8 °C, night-time lows 26.7 °C. The highest value of the past 10 years was 32.5 °C (29 Jul 2025), the lowest 25.4 °C (13 Jul 2018).

How often does it rain in San Juan in July?

On average there were 23.3 rain days (at least 1 mm) with 92.0 mm of precipitation in total.

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San Juan weather in July: temperature & rain

Photo: P. Hughes · CC BY-SA 4.0

🇵🇷 Weather in San Juan in July

This is what the weather in San Juan (Puerto Rico) was like in July over the years 2017–2026.

Key facts at a glance

Prevailing weather: Light rain

Avg. daytime high

30.8 °C

30.2 °C – 31.4 °C

Avg. night-time low

26.7 °C

26.1 °C – 27.4 °C

Avg. rain days in period

23.3

75 % of days · ≥ 1.0 mm

Avg. precipitation in period

92.0 mm

58.1 mm – 157 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 32.5 °C (29 Jul 2025) · Lowest temperature 25.4 °C (13 Jul 2018) · Avg. daily peak wind 24 km/h

Weather mix of all days

1Sunny
59Partly cloudy
17Cloudy
186Light rain
47Rain

Summary

On average 30.8 °C during the day and 26.7 °C at night.
On average 23.3 rain days (Rain day = at least 1.0 mm of precipitation) with 92.0 mm of precipitation in total.
Prevailing weather: Light rain.
Warmest year: 2023 (avg. 31.4 °C), coolest: 2018 (avg. 30.2 °C).
Wettest year: 2024 (157 mm), driest: 2025 (58.1 mm).
Extremes: 32.5 °C on 29 Jul 2025 and 25.4 °C on 13 Jul 2018.

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

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max31.3°Avg. min26.9°
Rain days
17 Rain days
Precipitation
60.8 mm
Avg. cloud cover
–
Sea temperature
–
Max 32.0 °C · Min 26.5 °C
2025
Avg. max31.0°Avg. min26.6°
Rain days
24 Rain days
Precipitation
58.1 mm
Avg. cloud cover
64 % cloudy
Sea temperature
–
Max 32.5 °C · Min 26.0 °C
2024
Avg. max30.3°Avg. min27.3°
Rain days
31 Rain days
Precipitation
157 mm
Avg. cloud cover
77 % cloudy
Sea temperature
–
Max 31.2 °C · Min 26.4 °C
2023
Avg. max31.4°Avg. min27.4°
Rain days
25 Rain days
Precipitation
104 mm
Avg. cloud cover
76 % cloudy
Sea temperature
–
Max 32.5 °C · Min 26.6 °C
2022
Avg. max30.4°Avg. min26.4°
Rain days
27 Rain days
Precipitation
94.5 mm
Avg. cloud cover
68 % cloudy
Sea temperature
–
Max 31.4 °C · Min 25.9 °C
2021
Avg. max30.2°Avg. min26.3°
Rain days
21 Rain days
Precipitation
95.5 mm
Avg. cloud cover
67 % cloudy
Sea temperature
–
Max 31.1 °C · Min 25.5 °C
2020
Avg. max31.3°Avg. min26.9°
Rain days
27 Rain days
Precipitation
111 mm
Avg. cloud cover
67 % cloudy
Sea temperature
–
Max 32.1 °C · Min 26.2 °C
2019
Avg. max31.0°Avg. min26.6°
Rain days
19 Rain days
Precipitation
82.1 mm
Avg. cloud cover
62 % cloudy
Sea temperature
–
Max 31.9 °C · Min 26.0 °C
2018
Avg. max30.2°Avg. min26.1°
Rain days
17 Rain days
Precipitation
68.1 mm
Avg. cloud cover
75 % cloudy
Sea temperature
–
Max 31.2 °C · Min 25.4 °C
2017
Avg. max30.5°Avg. min26.6°
Rain days
25 Rain days
Precipitation
89.4 mm
Avg. cloud cover
63 % cloudy
Sea temperature
–
Max 31.8 °C · Min 26.1 °C

Frequently asked questions

How warm is it in San Juan in July?: Daytime highs averaged 30.8 °C, night-time lows 26.7 °C. The highest value of the past 10 years was 32.5 °C (29 Jul 2025), the lowest 25.4 °C (13 Jul 2018).
How often does it rain in San Juan in July?: On average there were 23.3 rain days (at least 1 mm) with 92.0 mm of precipitation in total.

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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)