United States · 1991–2020 normal
Portola Hills in
September.
Typical September weather in Portola Hills: 31.7°C by day, 15.7°C at night, 4 mm of rain over 0.4 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high31.7°C
Typical low15.7°C
Rain4 mm
Wet days0.4
Comfort score 73 this month (November leads the year at 91). Daylight is calculated as 12 h 20 from latitude 33.68°. Open-water sea temperature is 20.5°C (23 km from the place centre).
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5384452
- NOAA station
- USC00044303 · IRVINE RCH
- Station distance
- 9.6 km from the place centre
- Coverage
- Good coverage · 18 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.