Corvallis in September
8.5out of 10
Yes, a good time to go
Warm and comfortable: highs around 26°C. Some rain: about 5 rainy days.
26°CAvg high
11°CAvg low
5Rainy days (34 mm)
12:17 hDaylight
06:59Sunrise · 19:16 Sunset
Why this score
- Warm and comfortable: highs around 26°C
- Some rain: about 5 rainy days
What to wear and pack
- T-shirts and light layers
- A light jacket for cooler evenings
How reliable is the forecast?
Rain in September varies a lot between years (±3.0 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 | 9°C | 2°C | 175 mm | 17 | – | – | 4.3 |
| February | 11°C | 3°C | 137 mm | 14 | – | – | 5.1 |
| March | 13°C | 4°C | 152 mm | 17 | – | – | 5.1 |
| April | 16°C | 5°C | 113 mm | 15 | – | – | 6.0 |
| May | 20°C | 8°C | 70 mm | 10 | – | – | 7.4 |
| June | 23°C | 10°C | 36 mm | 6 | – | – | 8.2 |
| July | 29°C | 12°C | 8 mm | 2 | – | – | 8.9 |
| August | 29°C | 13°C | 11 mm | 2 | – | – | 8.8 |
| September | 26°C | 11°C | 34 mm | 5 | – | – | 8.5 |
| October | 18°C | 7°C | 95 mm | 11 | – | – | 7.0 |
| November | 12°C | 4°C | 171 mm | 16 | – | – | 4.8 |
| December | 8°C | 2°C | 207 mm | 17 | – | – | 3.9 |
Frequently asked questions
How hot is Corvallis in September?
Daytime highs average 26°C and nights about 11°C.
When is the best time to visit Corvallis?
The best months are July, August, September.