Last updated: March 2, 2024
The weather in Happy Valley, United States, during September is characterized by an average temperature of 11°C (51°F). Highs can soar to 15°C (59°F), while lows may dip to 6°C (42°F). Typically, the humidity level in Happy Valley throughout September hovers around 90%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Happy Valley averages 139 mm (5.5 inches) of rainfall, typically over the course of 16 rainy days. The month enjoys an average of 12 hours 44 minutes of daylight, with the sun shining for approximately 6 hours 43 minutes each day. Additionally, there is a 35% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Happy Valley reaches a maximum of 4, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 14:00 and 16:00, during which unprotected skin may burn in as little as 30 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 0 | 1 | 1 | 1 | 2 | 3 | 3 | 4 | 3 | 3 | 2 | 1 | 1 |
| Exposure | Low | Moderate | Low | ||||||||||
| Time to burn | 45 min | 30 min | 45 min | ||||||||||