La Union weather in September
September in La Union: hot, soaked, with clean air — fine if you can take 26 rainy days.
#10 of 12 months in La Union · #710 of 897 destinations to visit in September · comfort 67/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on La Union in September
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La Union climate normals — September
| Daytime high | 29°C / 84°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 78°F | |
| Rainfall | 362 mm / 14.3 in | ⛈ soaked |
| Rainy days | 26 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 12.2 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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La Union in September — FAQ
- Is September a good time to visit La Union?
- September in La Union: hot, soaked, with clean air — fine if you can take 26 rainy days. It ranks #10 of 12 months for La Union on SeasonMap's comfort score (67/100).
- What is the weather like in La Union in September?
- In September, La Union averages a daily high of 29°C and a low of 25.6°C, with about 362.3 mm of rain over roughly 25.8 rainy days.
- What is the air quality in La Union in September?
- La Union has a mean US Air Quality Index of about 34 in September.