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Climate data for San Juan, Puerto Rico (Luis Muñoz Marín International Airport), 1991–2020 normals,[a] extremes 1898–present[b]
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 92 (33) |
96 (36) |
96 (36) |
97 (36) |
96 (36) |
97 (36) |
95 (35) |
97 (36) |
97 (36) |
98 (37) |
96 (36) |
94 (34) |
98 (37) |
| Mean maximum °F (°C) | 87.5 (30.8) |
88.2 (31.2) |
90.0 (32.2) |
91.7 (33.2) |
92.3 (33.5) |
92.7 (33.7) |
92.0 (33.3) |
92.8 (33.8) |
93.7 (34.3) |
92.7 (33.7) |
90.3 (32.4) |
88.0 (31.1) |
94.3 (34.6) |
| Mean daily maximum °F (°C) | 83.2 (28.4) |
83.8 (28.8) |
84.7 (29.3) |
86.2 (30.1) |
87.4 (30.8) |
89.0 (31.7) |
88.7 (31.5) |
89.1 (31.7) |
89.2 (31.8) |
88.6 (31.4) |
86.1 (30.1) |
84.2 (29.0) |
86.7 (30.4) |
| Daily mean °F (°C) | 77.6 (25.3) |
77.8 (25.4) |
78.6 (25.9) |
80.1 (26.7) |
81.6 (27.6) |
83.1 (28.4) |
83.1 (28.4) |
83.5 (28.6) |
83.4 (28.6) |
82.7 (28.2) |
80.5 (26.9) |
78.8 (26.0) |
80.9 (27.2) |
| Mean daily minimum °F (°C) | 71.9 (22.2) |
71.8 (22.1) |
72.4 (22.4) |
74.0 (23.3) |
75.7 (24.3) |
77.2 (25.1) |
77.6 (25.3) |
77.8 (25.4) |
77.5 (25.3) |
76.7 (24.8) |
74.9 (23.8) |
73.3 (22.9) |
75.1 (23.9) |
| Mean minimum °F (°C) | 68.3 (20.2) |
68.7 (20.4) |
69.2 (20.7) |
70.7 (21.5) |
72.1 (22.3) |
74.0 (23.3) |
74.1 (23.4) |
74.2 (23.4) |
74.3 (23.5) |
73.7 (23.2) |
71.7 (22.1) |
70.0 (21.1) |
67.8 (19.9) |
| Record low °F (°C) | 61 (16) |
62 (17) |
60 (16) |
64 (18) |
66 (19) |
66 (19) |
69 (21) |
68 (20) |
69 (21) |
67 (19) |
65 (18) |
62 (17) |
60 (16) |
| Average precipitation inches (mm) | 4.07 (103) |
2.58 (66) |
2.18 (55) |
4.60 (117) |
5.54 (141) |
4.66 (118) |
6.02 (153) |
6.29 (160) |
6.50 (165) |
5.21 (132) |
7.37 (187) |
4.85 (123) |
59.87 (1,521) |
| Average precipitation days (≥ 0.01 in) | 18.4 | 15.3 | 13.1 | 14.3 | 16.5 | 15.1 | 19.0 | 19.8 | 18.3 | 17.7 | 20.6 | 20.2 | 208.3 |
| Average relative humidity (%) | 74.0 | 72.4 | 71.0 | 71.3 | 74.9 | 75.5 | 75.9 | 76.4 | 76.4 | 76.9 | 76.2 | 74.7 | 74.6 |
| Average dew point °F (°C) | 67.1 (19.5) |
66.6 (19.2) |
66.7 (19.3) |
68.2 (20.1) |
71.1 (21.7) |
72.9 (22.7) |
73.4 (23.0) |
73.6 (23.1) |
73.2 (22.9) |
72.7 (22.6) |
70.9 (21.6) |
68.5 (20.3) |
70.4 (21.3) |
| Mean monthly sunshine hours | 237.4 | 231.2 | 282.0 | 268.3 | 255.2 | 259.4 | 280.8 | 267.8 | 234.7 | 227.2 | 202.4 | 217.4 | 2,963.8 |
| Percent possible sunshine | 69 | 72 | 76 | 71 | 63 | 65 | 69 | 68 | 64 | 63 | 60 | 64 | 67 |
| Average ultraviolet index | 8 | 10 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 10 | 9 | 8 | 11 |
| Source 1: NOAA (relative humidity and sun 1961–1990)[2][3][4] | |||||||||||||
| Source 2: The Weather Channel[5], Weather Atlas (UV)[6] | |||||||||||||
