Currently: 84 °F. Passing clouds. (Weather station: Luis Munoz Marin, Puerto Rico). See more current weatherSeptember 2018 Weather in San Juan — Graph
°F
Time
Wind
(mph)
(mph)
Temp
(°F)
(°F)
74
76
78
80
82
84
86
88
90
92
Sat, Sep 1
Lo:79
12 am
Hi:81
3
Lo:79
6 am
Hi:88
9
Lo:82
12 pm
Hi:88
16
Lo:81
6 pm
Hi:82
11
Sun, Sep 2
Lo:79
12 am
Hi:82
3
Lo:79
6 am
Hi:88
9
Lo:82
12 pm
Hi:88
17
Lo:82
6 pm
Hi:82
13
Mon, Sep 3
Lo:79
12 am
Hi:82
7
Lo:79
6 am
Hi:88
10
Lo:84
12 pm
Hi:88
12
Lo:81
6 pm
Hi:84
8
Tue, Sep 4
Lo:77
12 am
Hi:81
4
Lo:77
6 am
Hi:88
8
Lo:84
12 pm
Hi:88
12
Lo:81
6 pm
Hi:84
7
Wed, Sep 5
Lo:79
12 am
Hi:81
1
Lo:81
6 am
Hi:84
5
Lo:79
12 pm
Hi:86
7
Lo:81
6 pm
Hi:82
6
Thu, Sep 6
Lo:79
12 am
Hi:81
1
Lo:79
6 am
Hi:88
8
Lo:82
12 pm
Hi:88
14
Lo:81
6 pm
Hi:82
7
Fri, Sep 7
Lo:79
12 am
Hi:81
1
Lo:79
6 am
Hi:88
7
Lo:84
12 pm
Hi:88
17
Lo:81
6 pm
Hi:84
9
Sat, Sep 8
Lo:81
12 am
Hi:81
2
6 am
N/A
0
Lo:84
12 pm
Hi:86
16
Lo:82
6 pm
Hi:84
6
Sun, Sep 9
Lo:79
12 am
Hi:82
0
Lo:79
6 am
Hi:86
6
Lo:82
12 pm
Hi:88
11
Lo:81
6 pm
Hi:82
6
Mon, Sep 10
Lo:79
12 am
Hi:82
0
Lo:81
6 am
Hi:86
4
Lo:84
12 pm
Hi:88
9
Lo:82
6 pm
Hi:84
6
Tue, Sep 11
Lo:81
12 am
Hi:82
2
Lo:81
6 am
Hi:88
5
Lo:82
12 pm
Hi:88
10
Lo:81
6 pm
Hi:82
1
Wed, Sep 12
Lo:77
12 am
Hi:81
0
Lo:79
6 am
Hi:88
7
Lo:84
12 pm
Hi:88
14
Lo:82
6 pm
Hi:84
11
Thu, Sep 13
Lo:81
12 am
Hi:82
9
Lo:81
6 am
Hi:88
14
Lo:84
12 pm
Hi:90
17
Lo:79
6 pm
Hi:84
17
Fri, Sep 14
Lo:81
12 am
Hi:82
15
Lo:77
6 am
Hi:84
19
Lo:81
12 pm
Hi:84
12
Lo:75
6 pm
Hi:81
6
Sat, Sep 15
Lo:77
12 am
Hi:79
1
Lo:79
6 am
Hi:90
7
Lo:84
12 pm
Hi:90
7
Lo:82
6 pm
Hi:86
5
Sun, Sep 16
Lo:81
12 am
Hi:82
4
Lo:81
6 am
Hi:84
4
Lo:81
12 pm
Hi:88
6
Lo:79
6 pm
Hi:82
3
Mon, Sep 17
Lo:79
12 am
Hi:81
1
Lo:79
6 am
Hi:91
7
Lo:88
12 pm
Hi:91
10
Lo:82
6 pm
Hi:88
6
Tue, Sep 18
Lo:81
12 am
Hi:82
4
Lo:81
6 am
Hi:88
9
Lo:82
12 pm
Hi:88
14
Lo:79
6 pm
Hi:82
8
Wed, Sep 19
Lo:79
12 am
Hi:81
4
Lo:81
6 am
Hi:88
10
Lo:84
12 pm
Hi:90
16
Lo:81
6 pm
Hi:84
11
Thu, Sep 20
Lo:79
12 am
Hi:81
3
Lo:79
6 am
Hi:91
7
Lo:84
12 pm
Hi:91
15
Lo:81
6 pm
Hi:84
7
Fri, Sep 21
Lo:81
12 am
Hi:81
1
Lo:81
6 am
Hi:88
9
Lo:84
12 pm
Hi:90
14
Lo:81
6 pm
Hi:84
10
Sat, Sep 22
Lo:79
12 am
Hi:81
1
Lo:79
6 am
Hi:88
6
Lo:84
12 pm
Hi:88
14
Lo:81
6 pm
Hi:84
11
Sun, Sep 23
Lo:79
12 am
Hi:81
3
Lo:79
6 am
Hi:90
9
Lo:84
12 pm
Hi:90
12
Lo:82
6 pm
Hi:84
10
Mon, Sep 24
Lo:79
12 am
Hi:82
4
Lo:79
6 am
Hi:88
11
Lo:81
12 pm
Hi:90
16
Lo:79
6 pm
Hi:81
7
Tue, Sep 25
Lo:77
12 am
Hi:81
3
Lo:79
6 am
Hi:88
11
Lo:81
12 pm
Hi:88
11
Lo:77
6 pm
Hi:81
4
Wed, Sep 26
Lo:79
12 am
Hi:81
5
Lo:79
6 am
Hi:88
11
Lo:84
12 pm
Hi:88
17
Lo:81
6 pm
Hi:84
9
Thu, Sep 27
Lo:79
12 am
Hi:81
2
Lo:79
6 am
Hi:88
9
Lo:82
12 pm
Hi:86
12
Lo:79
6 pm
Hi:84
11
Fri, Sep 28
Lo:77
12 am
Hi:81
4
Lo:79
6 am
Hi:88
10
Lo:81
12 pm
Hi:88
12
Lo:77
6 pm
Hi:82
9
Sat, Sep 29
Lo:77
12 am
Hi:79
6
Lo:77
6 am
Hi:86
13
Lo:81
12 pm
Hi:84
11
Lo:79
6 pm
Hi:81
6
Sun, Sep 30
Lo:79
12 am
Hi:79
1
Lo:79
6 am
Hi:84
5
Lo:82
12 pm
Hi:86
14
Lo:81
6 pm
Hi:82
6
High & Low Weather Summary for September 2018
| Temperature | Humidity | Pressure | |
|---|---|---|---|
| High | 92 °F (Sep 20, 11:56 am) | 100% (Sep 3, 8:03 am) | 30.04 "Hg (Sep 3, 8:03 am) |
| Low | 76 °F (Sep 14, 6:56 pm) | 46% (Sep 20, 11:56 am) | 29.81 "Hg (Sep 14, 3:56 pm) |
| Average | 83 °F | 78% | 29.94 "Hg |
| * Reported Sep 1 12:56 am — Sep 30 11:56 pm, San Juan. Weather by CustomWeather, © 2025 | |||
Note: Actual official high and low records may vary slightly from our data, if they occured in-between our weather recording intervals... More about our weather records
San Juan Weather History for September 1, 2018
Scroll right to see more
| Conditions | Comfort | |||||||
|---|---|---|---|---|---|---|---|---|
| Time | Temp | Weather | Wind | Humidity | Barometer | Visibility | ||
| 12:56 am Sat, Sep 1 | | 80 °F | Passing clouds. | 8 mph | ↑ | 85% | 29.99 "Hg | 10 mi |
| 1:56 am | | 80 °F | Passing clouds. | 6 mph | ↑ | 85% | 29.97 "Hg | 10 mi |
| 2:56 am | | 80 °F | Passing clouds. | No wind | ↑ | 85% | 29.97 "Hg | 10 mi |
| 3:56 am | | 80 °F | Passing clouds. | 3 mph | ↑ | 85% | 29.96 "Hg | 10 mi |
| 4:56 am | | 79 °F | Passing clouds. | No wind | ↑ | 88% | 29.98 "Hg | 10 mi |
| 5:56 am | | 79 °F | Passing clouds. | No wind | ↑ | 84% | 29.99 "Hg | 10 mi |
| 6:56 am |  | 79 °F | Partly cloudy. | No wind | ↑ | 84% | 30.00 "Hg | 10 mi |
| 7:56 am |  | 81 °F | Scattered clouds. | 5 mph | ↑ | 82% | 30.01 "Hg | 10 mi |
| 8:56 am | | 83 °F | Scattered clouds. | 12 mph | ↑ | 74% | 30.02 "Hg | 10 mi |
| 9:56 am | | 85 °F | Scattered clouds. | 16 mph | ↑ | 68% | 30.02 "Hg | 10 mi |
| 10:56 am | | 87 °F | Scattered clouds. | 14 mph | ↑ | 61% | 30.02 "Hg | 10 mi |
| 11:56 am | | 87 °F | Scattered clouds. | 17 mph | ↑ | 67% | 30.01 "Hg | 10 mi |
| 12:56 pm | | 87 °F | Scattered clouds. | 15 mph | ↑ | 67% | 29.99 "Hg | 10 mi |
| 1:56 pm | | 87 °F | Scattered clouds. | 17 mph | ↑ | 67% | 29.97 "Hg | 10 mi |
| 2:56 pm | | 86 °F | Passing clouds. | 21 mph | ↑ | 63% | 29.96 "Hg | 10 mi |
| 3:56 pm | | 85 °F | Passing clouds. | 16 mph | ↑ | 68% | 29.95 "Hg | 10 mi |
| 4:56 pm | | 85 °F | Passing clouds. | 14 mph | ↑ | 70% | 29.93 "Hg | 10 mi |
| 5:56 pm | | 83 °F | Passing clouds. | 14 mph | ↑ | 74% | 29.94 "Hg | 10 mi |
| 6:56 pm | | 82 °F | Passing clouds. | 10 mph | ↑ | 77% | 29.95 "Hg | 10 mi |
| 7:56 pm | | 82 °F | Passing clouds. | 12 mph | ↑ | 77% | 29.96 "Hg | 10 mi |
| 8:56 pm | | 82 °F | Passing clouds. | 12 mph | ↑ | 77% | 29.98 "Hg | 10 mi |
| 9:56 pm | | 82 °F | Passing clouds. | 12 mph | ↑ | 77% | 29.98 "Hg | 10 mi |
| 10:56 pm | | 81 °F | Passing clouds. | 12 mph | ↑ | 79% | 29.98 "Hg | 10 mi |
| Weather by CustomWeather, © 2025 | ||||||||