Monrovia weather in September
September in Monrovia: hot, soaked, with clean air — a fair time to visit.
#11 of 12 months in Monrovia · #554 of 604 destinations to visit in September · comfort 54/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Monrovia climate normals — September
| Daytime high | 27°C / 81°F | 🥵 hot |
|---|---|---|
| Nighttime low | 23°C / 74°F | |
| Feels like (high) | 32°C / 90°F | |
| Rainfall | 594 mm / 23.4 in | ⛈ soaked |
| Rainy days | 30 days | |
| Humidity | 90% | 💦 very humid |
| Dew point | 23°C / 74°F | |
| Sunshine | 7.8 h/day | |
| Daylight | 12.2 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Monrovia?
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Monrovia in September — FAQ
- Is September a good time to visit Monrovia?
- September in Monrovia: hot, soaked, with clean air — a fair time to visit. It ranks #11 of 12 months for Monrovia on SeasonMap's comfort score (54/100).
- What is the weather like in Monrovia in September?
- In September, Monrovia averages a daily high of 27.3°C and a low of 23.2°C, with about 594.3 mm of rain over roughly 29.8 rainy days.
- What is the air quality in Monrovia in September?
- Monrovia has a mean US Air Quality Index of about 34 in September.