Cupertino in September
9.0out of 10
Yes, a good time to go
Warm and comfortable: highs around 26°C. Very dry: about 1 rainy days.
26°CAvg high
13°CAvg low
1Rainy days (2 mm)
12:14 hDaylight
06:56Sunrise · 19:09 Sunset
Why this score
- Warm and comfortable: highs around 26°C
- Very dry: about 1 rainy days
What to wear and pack
- T-shirts and light layers
- A light jacket for cooler evenings
- Shorts or a light skirt
How reliable is the forecast?
Rainfall in September is fairly consistent from year to year (0.9 days). 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 | 14°C | 6°C | 130 mm | 9 | – | – | 6.4 |
| February | 16°C | 7°C | 134 mm | 10 | – | – | 6.5 |
| March | 17°C | 8°C | 100 mm | 9 | – | – | 7.0 |
| April | 19°C | 8°C | 47 mm | 6 | – | – | 7.8 |
| May | 21°C | 10°C | 23 mm | 3 | – | – | 8.5 |
| June | 24°C | 12°C | 4 mm | 1 | – | – | 9.0 |
| July | 26°C | 13°C | 1 mm | 0 | – | – | 9.1 |
| August | 26°C | 14°C | 1 mm | 0 | – | – | 9.1 |
| September | 26°C | 13°C | 2 mm | 1 | – | – | 9.0 |
| October | 23°C | 11°C | 29 mm | 3 | – | – | 8.7 |
| November | 18°C | 8°C | 61 mm | 6 | – | – | 7.6 |
| December | 14°C | 6°C | 119 mm | 9 | – | – | 6.4 |
Frequently asked questions
How hot is Cupertino in September?
Daytime highs average 26°C and nights about 13°C.
When is the best time to visit Cupertino?
The best months are July, August, June, September.