Shiyan is warmest in August, averaging 31° by day and 20° at night. The wettest month is July with 223 mm, and the year brings about 1009 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 7° | -4° | 22 mm | 10.1 h | Cool |
| February | 10° | -2° | 25 mm | 10.8 h | Cool |
| March | 16° | 3° | 59 mm | 11.8 h | Sightseeing |
| April | 21° | 9° | 75 mm | 12.8 h | Sightseeing |
| May | 25° | 13° | 90 mm | 13.7 h | Beach weather |
| June | 30° | 18° | 120 mm | 14.1 h | Mild |
| July | 30° | 21° | 223 mm | 14.0 h | Rainy season |
| August | 31° | 20° | 152 mm | 13.2 h | Mild |
| September | 27° | 15° | 99 mm | 12.2 h | Beach weather |
| October | 19° | 9° | 99 mm | 11.2 h | Sightseeing |
| November | 14° | 3° | 36 mm | 10.3 h | Mild |
| December | 8° | -3° | 9 mm | 9.9 h | Cool |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: May and September — highs around 26°, nights no colder than 13°, and at most 99 mm of rain in a month.
Walking the city: March, April and October — highs of 16–21° and no more than 99 mm of rain a month.
Wet season: July — up to 223 mm in a single month.