San Juan weather by month

Check out San Juan weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in San Juan (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
27°C maximum daytime temperature in January in San Juan27
27°C maximum daytime temperature in February in San Juan27
28°C maximum daytime temperature in March in San Juan28
29°C maximum daytime temperature in April in San Juan29
29°C maximum daytime temperature in May in San Juan29
30°C maximum daytime temperature in June in San Juan30
30°C maximum daytime temperature in July in San Juan30
30°C maximum daytime temperature in August in San Juan30
30°C maximum daytime temperature in September in San Juan30
30°C maximum daytime temperature in October in San Juan30
29°C maximum daytime temperature in November in San Juan29
28°C maximum daytime temperature in December in San Juan28
Min temperature (night-time)
20°C minimum night-time temperature in January in San Juan20
20°C minimum night-time temperature in February in San Juan20
21°C minimum night-time temperature in March in San Juan21
21°C minimum night-time temperature in April in San Juan21
22°C minimum night-time temperature in May in San Juan22
23°C minimum night-time temperature in June in San Juan23
23°C minimum night-time temperature in July in San Juan23
24°C minimum night-time temperature in August in San Juan24
23°C minimum night-time temperature in September in San Juan23
23°C minimum night-time temperature in October in San Juan23
22°C minimum night-time temperature in November in San Juan22
21°C minimum night-time temperature in December in San Juan21
Heat & Humidity
Moderate heat & humidity in January in San JuanM
Moderate heat & humidity in February in San JuanM
Moderate heat & humidity in March in San JuanM
High heat & humidity in April in San JuanH
High heat & humidity in May in San JuanH
High heat & humidity in June in San JuanH
High heat & humidity in July in San JuanH
High heat & humidity in August in San JuanH
High heat & humidity in September in San JuanH
High heat & humidity in October in San JuanH
High heat & humidity in November in San JuanH
Moderate heat & humidity in December in San JuanM
Sea temperature
26°C sea temperature in January in San Juan26
26°C sea temperature in February in San Juan26
26°C sea temperature in March in San Juan26
26°C sea temperature in April in San Juan26
27°C sea temperature in May in San Juan27
28°C sea temperature in June in San Juan28
28°C sea temperature in July in San Juan28
28°C sea temperature in August in San Juan28
29°C sea temperature in September in San Juan29
29°C sea temperature in October in San Juan29
28°C sea temperature in November in San Juan28
27°C sea temperature in December in San Juan27

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & UV index in San Juan

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
11 hours of daylight per day in January in San Juan11
12 hours of daylight per day in February in San Juan12
12 hours of daylight per day in March in San Juan12
13 hours of daylight per day in April in San Juan13
13 hours of daylight per day in May in San Juan13
13 hours of daylight per day in June in San Juan13
13 hours of daylight per day in July in San Juan13
13 hours of daylight per day in August in San Juan13
12 hours of daylight per day in September in San Juan12
12 hours of daylight per day in October in San Juan12
11 hours of daylight per day in November in San Juan11
11 hours of daylight per day in December in San Juan11
UV Index (Maximum)
UV (maximum) index 8 (Very High) in January in San Juan8
UV (maximum) index 10 (Very High) in February in San Juan10
UV (maximum) index 11+ (Extreme) in March in San Juan11
UV (maximum) index 11+ (Extreme) in April in San Juan11
UV (maximum) index 11+ (Extreme) in May in San Juan11
UV (maximum) index 11+ (Extreme) in June in San Juan11
UV (maximum) index 11+ (Extreme) in July in San Juan11
UV (maximum) index 11+ (Extreme) in August in San Juan11
UV (maximum) index 11+ (Extreme) in September in San Juan11
UV (maximum) index 10 (Very High) in October in San Juan10
UV (maximum) index 9 (Very High) in November in San Juan9
UV (maximum) index 8 (Very High) in December in San Juan8

Rainfall in San Juan

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
20 days with some rainfall in January in San Juan20
15 days with some rainfall in February in San Juan15
15 days with some rainfall in March in San Juan15
14 days with some rainfall in April in San Juan14
16 days with some rainfall in May in San Juan16
17 days with some rainfall in June in San Juan17
19 days with some rainfall in July in San Juan19
20 days with some rainfall in August in San Juan20
18 days with some rainfall in September in San Juan18
18 days with some rainfall in October in San Juan18
19 days with some rainfall in November in San Juan19
21 days with some rainfall in December in San Juan21
Average monthly rainfall (mm)
116 mm monthly rainfall in January in San Juan116
82 mm monthly rainfall in February in San Juan82
79 mm monthly rainfall in March in San Juan79
121 mm monthly rainfall in April in San Juan121
182 mm monthly rainfall in May in San Juan182
151 mm monthly rainfall in June in San Juan151
180 mm monthly rainfall in July in San Juan180
195 mm monthly rainfall in August in San Juan195
188 mm monthly rainfall in September in San Juan188
171 mm monthly rainfall in October in San Juan171
178 mm monthly rainfall in November in San Juan178
151 mm monthly rainfall in December in San Juan151

More about San Juan

San Juan by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for Puerto Rico (San Juan) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in San Juan?

San Juan has a hot tropical climate with no dry season.

Metric (°C / mm)  |  Imperial (°F / inches)

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Tropical storm risk: San Juan, Puerto Rico hurricane season

% of month affected by tropical storms
0
0
0
0
0
0
0
2.2%
3.5%
1.3%
0
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Compare San Juan weather with the UK

The weather chart below compares the average monthly maximum daytime temperature for San Juan, Puerto Rico and the UK (London).

Maximum daytime temperature (°C)

San Juan, Puerto Rico
UK (London)
27
7
27
7
28
10
29
13
29
17
30
20
30
22
30
22
30
19
30
15
29
10
28
8
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C / mm)  |  Imperial (°F / inches)

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