San Juan, Sunday, 9 August, 08:15
Partly cloudy. Feels like 91°. High 90°, low 79°.
In September, San Juan, PR averages a high of 88.3° and a low of 75.7°. About 6.2 inches of precipitation fall over the month (25 wet days). The record high is 95.2° (2023) and the record low 70.9° (2022). Normals are computed over the last 60 years.
| Day | High | Low | Chance of precip. | Record high | Record low |
|---|---|---|---|---|---|
| 1 | 89.1° | 75.9° | 83% | 93.2° (1967) | 73° (2021) |
| 2 | 88.7° | 75.7° | 85% | 93.2° (2023) | 72.9° (1986) |
| 3 | 89.1° | 75.9° | 75% | 93.4° (1967) | 73.4° (2020) |
| 4 | 89.1° | 75.9° | 75% | 94.8° (2021) | 73.4° (1982) |
| 5 | 88.7° | 75.9° | 85% | 95.2° (2023) | 72.1° (1961) |
| 6 | 88.7° | 75.9° | 80% | 93.6° (2012) | 72.9° (2018) |
| 7 | 88.7° | 75.7° | 80% | 93.4° (2023) | 72° (2022) |
| 8 | 88.9° | 75.9° | 73% | 93.2° (1968) | 73.6° (2020) |
| 9 | 88.7° | 75.9° | 75% | 93.6° (1997) | 72.5° (2018) |
| 10 | 88.5° | 75.9° | 78% | 94.1° (1978) | 73° (2018) |
| 11 | 88.5° | 75.7° | 85% | 93.4° (2025) | 73.2° (2020) |
| 12 | 88.9° | 75.7° | 78% | 95° (1971) | 73.4° (2022) |
| 13 | 88.5° | 75.9° | 87% | 94.5° (2023) | 73.6° (1967) |
| 14 | 88.3° | 75.9° | 83% | 94.3° (2023) | 74.1° (1966) |
| 15 | 88° | 75.9° | 83% | 94.5° (2023) | 73.8° (1973) |
| 16 | 88.3° | 75.6° | 73% | 93.7° (2024) | 73° (2017) |
| 17 | 88.3° | 75.7° | 80% | 92.8° (2023) | 72.9° (1961) |
| 18 | 87.8° | 75.7° | 92% | 91.8° (1968) | 73° (1974) |
| 19 | 88.2° | 75.7° | 88% | 91.4° (1997) | 73.6° (1962) |
| 20 | 88.2° | 75.4° | 87% | 93.4° (2018) | 71.2° (2020) |
| 21 | 88° | 75.6° | 83% | 95° (2019) | 71.8° (2020) |
| 22 | 87.8° | 75.6° | 82% | 94.6° (2021) | 73.6° (2018) |
| 23 | 88° | 75.6° | 77% | 92.5° (1976) | 72.5° (1984) |
| 24 | 88.2° | 75.6° | 92% | 94.6° (2023) | 72.5° (2021) |
| 25 | 87.8° | 75.6° | 87% | 92.8° (2024) | 72.5° (2018) |
| 26 | 88.2° | 75.6° | 87% | 92.8° (1969) | 73° (1975) |
| 27 | 87.6° | 75.6° | 83% | 93.2° (1971) | 73.2° (2021) |
| 28 | 87.6° | 75.4° | 88% | 92.3° (1968) | 72.5° (1998) |
| 29 | 88° | 75.4° | 82% | 93.4° (2015) | 70.9° (2022) |
| 30 | 87.8° | 75.4° | 85% | 92.3° (2001) | 71.6° (2022) |