Last updated: March 2, 2024
The weather in Sammamish, United States, during September is characterized by an average temperature of 15°C (60°F). Highs can soar to 28°C (82°F), while lows may dip to 6°C (43°F). Typically, the humidity level in Sammamish throughout September hovers around 62%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Sammamish averages 124 mm (4.9 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 12 hours 29 minutes of daylight, with the sun shining for approximately 8 hours 21 minutes each day. Additionally, there is a 38% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Sammamish reaches a maximum of 7, indicating a level of High exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 25 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 | 5 | 6 | 7 | 6 | 5 | 4 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||