Sun Valley in May
7.9out of 10
Yes, a good time to go
Mild: highs around 20°C. Some rain: about 7 rainy days.
20°CAvg high
5°CAvg low
7Rainy days (31 mm)
14:11 hDaylight
05:50Sunrise · 20:01 Sunset
Why this score
- Mild: highs around 20°C
- Some rain: about 7 rainy days
What to wear and pack
- Layers you can add or remove
- A light jacket for cooler evenings
- Comfortable walking shoes
How reliable is the forecast?
Rain in May varies a lot between years (±4.0 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 | 5°C | -5°C | 67 mm | 8 | – | – | 4.8 |
| February | 7°C | -4°C | 60 mm | 8 | – | – | 5.2 |
| March | 11°C | -2°C | 55 mm | 8 | – | – | 5.9 |
| April | 15°C | 1°C | 32 mm | 7 | – | – | 6.9 |
| May | 20°C | 5°C | 31 mm | 7 | – | – | 7.9 |
| June | 26°C | 10°C | 15 mm | 4 | – | – | 8.6 |
| July | 31°C | 14°C | 9 mm | 2 | – | – | 8.2 |
| August | 30°C | 13°C | 8 mm | 3 | – | – | 8.3 |
| September | 26°C | 10°C | 9 mm | 3 | – | – | 8.8 |
| October | 19°C | 4°C | 24 mm | 3 | – | – | 8.2 |
| November | 11°C | -1°C | 34 mm | 6 | – | – | 6.3 |
| December | 5°C | -6°C | 65 mm | 8 | – | – | 4.7 |
Frequently asked questions
How hot is Sun Valley in May?
Daytime highs average 20°C and nights about 5°C.
When is the best time to visit Sun Valley?
The best months are September, June, August.