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Weather in September in San Juan

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< September >
 
Normal Max/ High Temperature 31°C (88°F)
 
Average Temperature 27°C (81°F)
 
Min/ Low Temperature 23°C (73°F)
Average Sea or Water Temp 29°C(84°F)
 
Normal Precipitation 172mm (6.8in)
Number of Wet Days (probability of rain on a day) 18 (60%)
Average Sunlight per day 06:52
Average Daylight per day 12:12
Sunny (Cloudy) Daylight Hours 57% (43%)
Sun altitude at solar noon on the 21st day.
72°


  • The average sea tempeature is 29 °C (84.2 °F).
  • The average temperature in San Juan in September is hot at 27 °C (80.6 °F).
  • Afternoons can be very hot with average high temperatures reaching 31 °C (87.8 °F).
  • Overnight temperatures are generally fairly hot with an average low of 23 °C (73.4 °F).
  • In September the mean daily temperature range/ variation is 8 °C (14.4 °F).
  • The weather in September is very slightly soggy with rain at intervals. Around 172mm (6.8in) of H2O precipitates during on average 18 days.
  • The skies in San Juan are fine having on balance a measurable 6:52 of blazing solar radiation per day.
  • The shortest day is 11:57 long and the longest day is 12:28 long with an average length of 12:12.
  • There are approximately 5:13 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 56.8% of daylight hours and cloudy 43.2% of daylight hours.

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Weather Trend Graph for September in San Juan, Puerto Rico

Graph of weather in San Juan in September

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