Singapore Singapore Weather in September — Climate Guide
September in Singapore is Good
September is Good for Singapore.
September is dominated by the Formula 1 Singapore Grand Prix (late September). Hotels triple in price for the F1 weekend — 4-star at $700-1,300 / S$895-1,665. Cocktail bars and rooftop venues fully book 2-3 months ahead.
The Mid-Autumn Festival (lunar — typically mid-September) brings mooncakes citywide. Specialty mooncake boxes from Raffles Hotel, Goodwood Park, and the Mandarin Oriental are gift-worthy.
Travel score
Wet tail + F1 Grand Prix + Korean Chuseok
September Weather at a Glance
September averages 88°F / 31°C highs and 77°F / 25°C lows — wet tail. 11 rainy days, 165mm. Humidity 82%. PM2.5 haze season tail. Late September dry season begins.
September Travel Advice
Short sleeves + shorts + SPF 50 + folding umbrella. F1 Singapore Grand Prix (every year 3rd weekend of September, Marina Bay street circuit, world's only night F1) signature — hotels need 6-month advance booking, F1 week hotels 2-3x. Korean Chuseok 1-week fare spikes.
Flying In from Overseas
Korean Chuseok (varies by year, mid-September to early October) + F1 stack — Asia-Singapore $620-1,070 round-trip. F1 week + Chuseok 1-week $850-1,400.
September Pricing Trends
F1 week 2-3x — Marina Bay 5-star $1,050-2,100/night. Post-F1 + post-Chuseok value returns to $105-200.
Singapore September Weather Stats
Avg High
31°C
Avg Low
25°C
Rainy Days
13
165mm total
Sunshine
6h
Daily avg
Humidity
81%
Muggy
UV Index
11
Extreme
Wind
10 km/h
Gusts 20
Sea Temp
29°C
Swimming ideal
Crowds
Very busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
23 μg/m³
PM10
36 μg/m³
Status
Moderate
Feels-Like Temperature & Wind
Feels like
Daytime
38°C
Nighttime
28°C
Humidity and wind affect how the actual temperature feels.
Wind
10 km/h
Max gust 20 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- F1 Singapore Grand Prix experience
- Mid-Autumn Festival mooncakes
- Strong photography weather mid-month
Cons
- F1 weekend triples hotel prices
- Indonesian haze potential (decreasing mid-month)
- Late-month tourist crowds
September Events & Festivals
- Formula 1 Singapore Grand Prix (late September) — the year's peak hotel pricing
- Mid-Autumn Festival (date varies, mooncakes citywide)
Singapore in September — Full Picture
September is dominated by the Formula 1 Singapore Grand Prix (late September). Hotels triple in price for the F1 weekend — 4-star at $700-1,300 / S$895-1,665. Cocktail bars and rooftop venues fully book 2-3 months ahead.
The Mid-Autumn Festival (lunar — typically mid-September) brings mooncakes citywide. Specialty mooncake boxes from Raffles Hotel, Goodwood Park, and the Mandarin Oriental are gift-worthy.
F1 aside, September is a strong month — Indonesian haze risk decreases mid-month, sunshine increases. Pre-F1 (early September) and post-F1 (early October) bracket the spike. Avoid F1 week unless that's specifically the trip.
What to Wear & What to Pack
F1 Grand Prix month — smart-casual cocktail attire popular at hotel bars. 31°C/25°C, 81% humidity. Quick-dry casual for daytime + dressed-up for F1 evening events. Possible haze season — N95 backup.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
32°C
24.7°C
13.3/mo
Summer (Jun·Jul·Aug)
31°C
25°C
13/mo
Autumn (Sep·Oct·Nov)
Current31°C
24.7°C
14.3/mo
Winter (Dec·Jan·Feb)
30.3°C
24°C
14/mo
Singapore Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 30° | 24° | 15d·240mm | 5.5h | 84% | 11 | Very busy | Peak | |
| February (Best) | 31° | 24° | 10d·110mm | 6.5h | 80% | 11 | Busy | Peak |
| March (Best) | 32° | 24° | 13d·175mm | 6.5h | 81% | 12 | Busy | Shoulder |
| 32° | 25° | 14d·175mm | 6.5h | 82% | 12 | Moderate | Shoulder | |
| 32° | 25° | 13d·170mm | 6h | 84% | 12 | Moderate | Shoulder | |
| 31° | 25° | 13d·160mm | 6h | 82% | 12 | Busy | Shoulder | |
| 31° | 25° | 13d·150mm | 6h | 82% | 12 | Busy | Peak | |
| 31° | 25° | 13d·145mm | 6.5h | 81% | 12 | Very busy | Peak | |
| 31° | 25° | 13d·165mm | 6h | 81% | 11 | Very busy | Peak | |
| 31° | 25° | 14d·180mm | 6h | 83% | 11 | Moderate | Shoulder | |
| 31° | 24° | 16d·260mm | 5h | 85% | 10 | Moderate | Low season | |
| 30° | 24° | 17d·290mm | 5h | 86% | 10 | Very busy | Peak |
View Other Months
Singapore September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Singapore?
Singapore in September is Good. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Singapore in September?
Singapore September averages a high of 31°C and a low of 25°C.
Does it rain much in Singapore in September?
Singapore September averages 165mm of rainfall over about 13 rainy days.
What should I wear in Singapore in September?
F1 Grand Prix month — smart-casual cocktail attire popular at hotel bars. 31°C/25°C, 81% humidity. Quick-dry casual for daytime + dressed-up for F1 evening events. Possible haze season — N95 backup.
What time are sunrise and sunset in Singapore in September?
Singapore September sunrise is 06:55 and sunset is 19:00, with 12h 05m of daylight.
What's the air quality like in Singapore in September?
Singapore September air quality (AQI) averages 50, rated Good. PM2.5 averages 23μg/m³.
What activities are recommended in Singapore in September?
In September, Singapore is great for F1 Grand Prix race (late Sept), Mid-Autumn Festival mooncake tasting, Marina Bay rooftop bars.
Is September peak season in Singapore?
Singapore September crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Singapore
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.