San Sebastian in september: average Weather, Temperature and Climate
Weather in San Sebastian in september 2025
The weather in San Sebastian in the month of september comes from statistical datas on the past years. You can view the weather statistics the entire month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
tolerable weather UV index: 7
Weather at 6am
81°F
Clear/Sunny
61% of time
30%
7%
3%
Weather at 12pm
86°F
Clear/Sunny
39% of time
22%
21%
16%
Weather at 6pm
81°F
Heavy rain
32% of time
31%
25%
12%
Weather at 3am
79°F
58%
24%
17%
3%
Evolution of daily average temperature and precipitation in San Sebastian in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in San Sebastian in september.
The climate of San Sebastian in september is tolerable
the weather in San Sebastian in september is wet (with 9.6in of rainfall over 13 days). The situation is deteriorating compared to the previous month since in august there is an average of 7.9in of rainfall over 12 days.
The climate quite good in this city this month. The high seasonal norm is 88°F. On average, the recorded minimum temperature is 81°F. Thus, the mean temperature average in september in San Sebastian is 85°F. These temperatures are far removed from those records observed in San Sebastian in september with a maximum record of 95°F in 2021 and a minimum record of 72°F in 2021. You can plan to have about 18 days with temperatures over 86°F, or 60 of the month.
On this month of september, day length in San Sebastian is generally 12:14. The sun rises at 06:16 and sets at 18:30.
With a correct climate, september is okay (but not the best) to go in this city in Puerto Rico.
September: another location in Puerto Rico?
If you want to go to Puerto Rico in september, there are destinations with better weather than San Sebastian:
In september, San Juan, Bayamón, Vieques, Carolina, Ceiba and Fajardo have good weather.
Seasonal average climate and temperature of San Sebastian in september
Check below seasonal norms These datas are generated from the weather statements of the last years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 85°F | ||||
| Highest temperature | 88°F | ||||
| Lowest temperature | 81°F | ||||
| Highest record temperature | 95°F (2021) | ||||
| Lowest record temperature | 72°F (2021) | ||||
| Number of days at +86°F | 18 day(s) (60%) | ||||
| 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 | 14km/h | ||||
| Wind temperature | 81°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 9.6in | ||||
| Number of days with rainfall | 13 day(s) (44%) | ||||
| Record daily rainfall | 11.5in (2017) | ||||
| Other climate data | |||||
| Humidity | 82% | ||||
| Visibility | 9.37km | ||||
| Cloud cover | 23% | ||||
| UV index | 7 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:16 | ||||
| Time of sunset | 18:30 | ||||
| Length of day | 12:14 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | tolerable | ||||
How was the weather last september?
Here is the day by day recorded weather in San Sebastian in september 2024:
76°F to 86°F
76°F to 86°F
77°F to 92°F
76°F to 88°F
76°F to 85°F
76°F to 88°F
76°F to 86°F
77°F to 88°F
77°F to 85°F
76°F to 86°F
76°F to 88°F
77°F to 88°F
77°F to 88°F
77°F to 90°F
77°F to 90°F
76°F to 90°F
72°F to 90°F
77°F to 88°F
74°F to 90°F
76°F to 86°F
74°F to 85°F
76°F to 88°F
77°F to 86°F
77°F to 86°F
77°F to 90°F
77°F to 86°F
76°F to 88°F
76°F to 88°F
72°F to 88°F
74°F to 86°F
Map: other cities in Puerto Rico in september
Cities near San Sebastian:
| Quebradillas in september | tolerable weather |
| Anasco in september | tolerable weather |
| Isabela in september | tolerable weather |
| Aguadilla in september | tolerable weather |
| Mayagüez in september | tolerable weather |
| Hatillo in september | tolerable weather |
| Hormigueros in september | tolerable weather |
| Rincon in september | tolerable weather |
| San German in september | tolerable weather |
| Arecibo in september | tolerable weather |
| Utuado in september | tolerable weather |
| Cabo Rojo in september | tolerable weather |
Click over cities on the map for information about the weather in september.
San Sebastian
perfect weather
good
tolerable
bad
very bad
Weather data for San Sebastian in september:
Weather data for San Sebastian for september are derived from an average of the weather forecast since 2009 in San Sebastian. There is a margin of error and these forecasts are to be considered as general information only. The weather in San Sebastian 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 Sebastian.