Singapore Weather in September
Singapore · Equatorial climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Singapore sees average temperatures ranging from a low of 24.5°C (76.1°F) to a high of 29.5°C (85.1°F), with a mean of 26.7°C (80.1°F). Compared to the annual average of 26.6°C (79.9°F), this month is 0.1°C warmer than the yearly norm. Precipitation averages 275.9mm, making it approximately 19.0mm drier than the monthly average of 294.0mm. The city receives an average of 8.9 hours of sunshine per day during September, with relative humidity averaging 86.0%. Wind speeds reach an average maximum of 14.1 km/h. For travelers, this month offers a temperature experience in Singapore, with drier-than-average conditions compared to the rest of the year.
If you're planning outdoor activities in Singapore, accept that you'll sweat — the question is how much. I did a 10km run at 7am in March: 27°C, 85% humidity, UV already at 7. Brutal but doable. MacRitchie Reservoir trail is best 6-8am; after that, heat becomes dangerous. The UV index hits 11+ year-round between 11am-3pm — avoid all direct sun. East Coast Park cycling is breezy enough to be pleasant even at noon. Rain comes hard and fast in afternoon thunderstorms, usually gone in 90 minutes. Hydrate aggressively, always.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 26.7°C (80.1°F) | 26.7°C (80.1°F) | 26.7°C (80.1°F) |
| Rainfall | 299.5mm | 275.9mm | 310.9mm |
| Sunshine | 9.5 hrs | 8.9 hrs | 8.8 hrs |
| Humidity | 86.1% | 86.0% | 86.8% |
| Wind | 14.4 km/h | 14.1 km/h | 12.9 km/h |
| Rainy Days | 29.8 | 28.8 | 29.4 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Singapore in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Singapore in September?
The average temperature in Singapore during September ranges from 24.5°C (76.1°F) to 29.5°C (85.1°F), with a mean of 26.7°C (80.1°F).
How much does it rain in Singapore in September?
Singapore receives an average of 275.9mm of precipitation in September, spread across approximately 28.8 rainy days.
What should I pack for Singapore in September?
Based on September weather data, pack lightweight, breathable clothing, sunscreen, and a hat. Rain gear is essential — this month averages 275.9mm of precipitation.
Is September a good time to visit Singapore?
September is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Singapore
Cities with Similar September Climate (Equatorial)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 1.35°, 103.82°. Timezone: Asia/Singapore. Last updated: 2026-07-30.