How warm is it in Singapore in September?

Daytime highs averaged 29.8 °C, night-time lows 25.6 °C. The highest value of the past 10 years was 32.6 °C (27 Sep 2019), the lowest 24.1 °C (22 Sep 2019).

How often does it rain in Singapore in September?

On average there were 25.8 rain days (at least 1 mm) with 712 mm of precipitation in total.

How warm is the sea in Singapore in September?

The sea temperature averaged 29.7 °C (open-sea point approx. 6 km from the town).

Holiday Weather Rewind

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Singapore weather in September: temperature & rain

Photo: Basile Morin · CC BY-SA 4.0

🇸🇬 Weather in Singapore in September

This is what the weather in Singapore was like in September over the years 2017–2026.

Key facts at a glance

Prevailing weather: Rain

Avg. daytime high

29.8 °C

29.0 °C – 31.1 °C

Avg. night-time low

25.6 °C

25.2 °C – 26.3 °C

Avg. rain days in period

25.8

86 % of days · ≥ 1.0 mm

Avg. precipitation in period

712 mm

78.5 mm – 4,440 mm

Avg. cloud cover

85 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

29.7 °C

Sea measuring point approx. 6 km from the location

Extremes: Highest temperature 32.6 °C (27 Sep 2019) · Lowest temperature 24.1 °C (22 Sep 2019) · Avg. daily peak wind 14 km/h

Weather mix of all days

4Sunny
18Partly cloudy
20Cloudy
67Light rain
191Rain

Summary

On average 29.8 °C during the day and 25.6 °C at night.
On average 25.8 rain days (Rain day = at least 1.0 mm of precipitation) with 712 mm of precipitation in total.
The sea averaged 29.7 °C.
Prevailing weather: Rain.
Warmest year: 2019 (avg. 31.1 °C), coolest: 2022 (avg. 29.0 °C).
Wettest year: 2026 (4,440 mm), driest: 2019 (78.5 mm).
Extremes: 32.6 °C on 27 Sep 2019 and 24.1 °C on 22 Sep 2019.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max30.1°Avg. min26.2°
Rain days
30 Rain days
Precipitation
4,440 mm
Avg. cloud cover
–
Sea temperature
30.2 °C
Max 31.3 °C · Min 25.4 °C
2025
Avg. max29.2°Avg. min25.7°
Rain days
29 Rain days
Precipitation
443 mm
Avg. cloud cover
86 % cloudy
Sea temperature
29.7 °C
Max 31.7 °C · Min 25.0 °C
2024
Avg. max30.0°Avg. min26.3°
Rain days
29 Rain days
Precipitation
368 mm
Avg. cloud cover
88 % cloudy
Sea temperature
30.1 °C
Max 31.3 °C · Min 25.6 °C
2023
Avg. max30.1°Avg. min25.9°
Rain days
22 Rain days
Precipitation
440 mm
Avg. cloud cover
80 % cloudy
Sea temperature
29.9 °C
Max 32.1 °C · Min 25.2 °C
2022
Avg. max29.0°Avg. min25.4°
Rain days
30 Rain days
Precipitation
390 mm
Avg. cloud cover
94 % cloudy
Sea temperature
29.4 °C
Max 31.0 °C · Min 24.4 °C
2021
Avg. max29.4°Avg. min25.4°
Rain days
30 Rain days
Precipitation
371 mm
Avg. cloud cover
82 % cloudy
Sea temperature
29.8 °C
Max 32.1 °C · Min 24.2 °C
2020
Avg. max29.1°Avg. min25.3°
Rain days
30 Rain days
Precipitation
246 mm
Avg. cloud cover
90 % cloudy
Sea temperature
29.5 °C
Max 31.0 °C · Min 24.3 °C
2019
Avg. max31.1°Avg. min25.3°
Rain days
13 Rain days
Precipitation
78.5 mm
Avg. cloud cover
71 % cloudy
Sea temperature
29.3 °C
Max 32.6 °C · Min 24.1 °C
2018
Avg. max29.8°Avg. min25.2°
Rain days
18 Rain days
Precipitation
166 mm
Avg. cloud cover
87 % cloudy
Sea temperature
29.2 °C
Max 31.5 °C · Min 24.6 °C
2017
Avg. max29.8°Avg. min25.6°
Rain days
27 Rain days
Precipitation
173 mm
Avg. cloud cover
89 % cloudy
Sea temperature
29.6 °C
Max 31.2 °C · Min 24.7 °C

Frequently asked questions

How warm is it in Singapore in September?: Daytime highs averaged 29.8 °C, night-time lows 25.6 °C. The highest value of the past 10 years was 32.6 °C (27 Sep 2019), the lowest 24.1 °C (22 Sep 2019).
How often does it rain in Singapore in September?: On average there were 25.8 rain days (at least 1 mm) with 712 mm of precipitation in total.
How warm is the sea in Singapore in September?: The sea temperature averaged 29.7 °C (open-sea point approx. 6 km from the town).

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Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis); Sea measuring point approx. 6 km from the location (1.240, 103.830)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)