Bothell in September
7.6out of 10
Yes, a good time to go
Mild: highs around 20°C. Frequent rain: about 9 rainy days.
20°CAvg high
12°CAvg low
9Rainy days (71 mm)
12:20 hDaylight
06:53Sunrise · 19:13 Sunset
Why this score
- Mild: highs around 20°C
- Frequent rain: about 9 rainy days
- Rain varies a lot between years (±4.2 days)
What to wear and pack
- Layers you can add or remove
- A light jacket for cooler evenings
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±4.2 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 8°C | 4°C | 180 mm | 18 | – | – | 4.0 |
| February | 9°C | 4°C | 120 mm | 15 | – | – | 4.9 |
| March | 11°C | 5°C | 139 mm | 18 | – | – | 4.7 |
| April | 14°C | 7°C | 113 mm | 16 | – | – | 5.5 |
| May | 17°C | 9°C | 80 mm | 13 | – | – | 6.6 |
| June | 20°C | 11°C | 71 mm | 11 | – | – | 7.2 |
| July | 23°C | 13°C | 33 mm | 6 | – | – | 8.2 |
| August | 23°C | 14°C | 38 mm | 5 | – | – | 8.4 |
| September | 20°C | 12°C | 71 mm | 9 | – | – | 7.6 |
| October | 15°C | 8°C | 143 mm | 15 | – | – | 5.6 |
| November | 10°C | 6°C | 197 mm | 18 | – | – | 4.2 |
| December | 7°C | 4°C | 180 mm | 18 | – | – | 3.9 |
Frequently asked questions
How hot is Bothell in September?
Daytime highs average 20°C and nights about 12°C.
When is the best time to visit Bothell?
The best months are August, July.