September weather forecast
Palo Alto, Philippines

September, the first month of the autumn in Palo Alto, is still a warm month, with temperature in the range of an average high of 29.7°C (85.5°F) and an average low of 24°C (75.2°F).

Temperature

The advent of September denotes an average high-temperature of a still moderately hot 29.7°C (85.5°F), subtly different from August's 29.8°C (85.6°F). Palo Alto reports a consistent average low-temperature of 24°C (75.2°F) throughout September nights.

Heat index

The heat index in September is computed to be a torrid 38°C (100.4°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', gives an indication of how one might feel in terms of heat after considering humidity. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

The most humid month is September, with an average relative humidity of 86%.

Rainfall

In Palo Alto, in September, during 22.7 rainfall days, 65mm (2.56") of precipitation is typically accumulated. In Palo Alto, during the entire year, the rain falls for 216.4 days and collects up to 476mm (18.74") of precipitation.

Daylight

In September, the average length of the day is 12h and 13min.
On the first day of September, sunrise is at 5:43 am and sunset at 6:07 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 5:45 pm PST.

Sunshine

In Palo Alto, the average sunshine in September is 8.1h.

UV index

February through July, September and November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In September, a daily UV index of 7 turns into the following recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.