Last updated: March 2, 2024
The weather in Northwest, United States, during September is characterized by an average temperature of 24°C (76°F). Highs can soar to 33°C (92°F), while lows may dip to 13°C (56°F). Typically, the humidity level in Northwest throughout September hovers around 79%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Northwest averages 193 mm (7.6 inches) of rainfall, typically over the course of 13 rainy days. The month enjoys an average of 12 hours 20 minutes of daylight, with the sun shining for approximately 9 hours 49 minutes each day. Additionally, there is a 53% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Northwest reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 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 | 1 | 1 | 2 | 4 | 7 | 8 | 9 | 9 | 7 | 5 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||