San Juan in september: average Weather, Temperature and Climate
Weather in San Juan in september 2025
The weather in San Juan in september comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also by using the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather UV index: 7
Weather at 6am
83°F
Partly Cloudy
44% of time
35%
18%
3%
Weather at 12pm
86°F
Clear/Sunny
54% of time
24%
17%
4%
Weather at 6pm
83°F
Clear/Sunny
46% of time
38%
13%
2%
Weather at 3am
81°F
40%
36%
21%
3%
Evolution of daily average temperature and precipitation in San Juan in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in San Juan in september.
The climate of San Juan in september is good
The climate in september in San Juan is wet (with 4in of rainfall over 5 days). The weather is better from the previous month since in august it receives an average of 3.6in of precipitation over 4 days.
The climate quite good in this city september. The high seasonal norm is 86°F. In the morning the temperature drops to 83°F. Thus, the mean temperature average in september in San Juan is 85°F. Note that these seasonal averages are in contrast with those observed in San Juan in the month of september with a maximum record of 95°F in 2021 and a minimum record of 74°F in 2021. You can plan to have about 19 days with temperatures above 86°F, or 63 of the month.
Day length in San Juan in september is 12:14. The sun rises at 06:12 and sunset is at 18:26.
With a correct weather, this month is okay (but not good) to go in San Juan in Puerto Rico.
Seasonal average climate and temperature of San Juan in september
Check below seasonal norms These statistics are set from the weather statements earlier years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 85°F | ||||
| Highest temperature | 86°F | ||||
| Lowest temperature | 83°F | ||||
| Highest record temperature | 95°F (2021) | ||||
| Lowest record temperature | 74°F (2021) | ||||
| Number of days at +86°F | 19 day(s) (63%) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Sea temperature | |||||
| Average sea temperature | 85°F | ||||
| Lowest sea temperature | 84°F | ||||
| Highest sea temperature | 87°F | ||||
| Wind | |||||
| Wind speed | 18km/h | ||||
| Wind temperature | 83°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 4in | ||||
| Number of days with rainfall | 5 day(s) (17%) | ||||
| Record daily rainfall | 7.8in (2017) | ||||
| Other climate data | |||||
| Humidity | 81% | ||||
| Visibility | 9.72km | ||||
| Cloud cover | 29% | ||||
| UV index | 7 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:12 | ||||
| Time of sunset | 18:26 | ||||
| Length of day | 12:14 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in San Juan in september 2024:
81°F to 88°F
81°F to 86°F
81°F to 86°F
81°F to 86°F
81°F to 86°F
79°F to 88°F
79°F to 88°F
81°F to 88°F
81°F to 86°F
81°F to 86°F
79°F to 86°F
81°F to 88°F
79°F to 88°F
81°F to 90°F
81°F to 90°F
81°F to 88°F
81°F to 85°F
83°F to 88°F
83°F to 85°F
83°F to 90°F
81°F to 88°F
81°F to 88°F
81°F to 88°F
81°F to 88°F
83°F to 88°F
83°F to 86°F
83°F to 85°F
85°F to 90°F
83°F to 88°F
83°F to 88°F
Map: other cities in Puerto Rico in september
Cities near San Juan:
| Bayamón in september | good weather |
| Dorado in september | tolerable weather |
| Carolina in september | good weather |
| Vega Alta in september | tolerable weather |
| Caguas in september | tolerable weather |
| Comerio in september | tolerable weather |
| Cidra in september | tolerable weather |
| Cayey in september | tolerable weather |
| Aibonito in september | tolerable weather |
| Manati in september | tolerable weather |
| Luquillo in september | good weather |
| Humacao in september | tolerable weather |
Click over cities on the map for information about the weather in september.
San Juan
perfect weather
good
tolerable
bad
very bad
Weather data for San Juan in september:
Weather data for San Juan for september are derived from an average of the weather forecast since 2009 in San Juan. There is a margin of error and these forecasts are to be considered as general information only. The weather in San Juan can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to San Juan.