Business attire in Singapore follows the formality of the room, adjusted for heat outdoors and cold air-conditioning indoors. Match or exceed your host's tier, choose breathable fabric and carry a light layer. Singapore's annual mean temperature was 28.1°C in 2025 (NEA, 23 March 2026), while the Go 25 movement promotes indoor settings of around 25°C. Singapore's courts expect business wear, smart casual wear or traditional dress (Singapore Judiciary, 5 January 2026).
Accurate as of 5 November 2026. Every figure, date and rule on this page was checked against its source on that date, and the page is rechecked monthly.
Singapore's weather and cold air-conditioning set the limits for formal dress
Outdoor afternoons average 30.5°C to 32.4°C while an office at the Go 25 setting sits near 25°C, so the clothing that works is the clothing that copes with a swing of 5.5°C to 7.4°C between the street and the desk.
This guide covers dress for offices, client meetings, interviews, court visits and site visits in Singapore. Uniforms, religious dress and sector-specific safety clothing sit outside it. The tiers and clothing suggestions are Aemorph's editorial guidance; the court and MOM items are published rules, and the table below marks which is which.
The Meteorological Service Singapore (MSS) reports 1991 to 2020 monthly means of daily maximum temperature from 30.5°C (December) to 32.4°C (April), and daily minimum from 24.3°C to 25.7°C. The Go 25 national movement, launched on 16 May 2025 by the Singapore Green Building Council and the Ministry of Sustainability and the Environment, promotes air-conditioning at 25°C or higher in homes, offices and other buildings. The gap between those two figures is the temperature change a commuter dresses for.
| Reference point | Outdoor reading (°C) | Go 25 office setting (°C) | Gap to the office (°C) | Dressing consequence |
|---|---|---|---|---|
| Coolest month, mean daily maximum (December) | 30.5 | 25 | 5.5 warmer outdoors | A light jacket or cardigan worn only indoors |
| Warmest month, mean daily maximum (April) | 32.4 | 25 | 7.4 warmer outdoors | Carry the jacket; put it on at the lift lobby |
| Monthly mean daily minimum, lowest to highest | 24.3 to 25.7 | 25 | 0.7 cooler to 0.7 warmer | A pre-dawn walk matches the office setting |
Gap between MSS monthly mean daily maximum and minimum temperatures (1991 to 2020) and the 25°C Go 25 reference setting, checked 5 November 2026. Individual offices set their own temperature.
Source: Meteorological Service Singapore, November 2026
Source: Ministry of Sustainability and the Environment, November 2026
How humid is Singapore, and what does it do to shirts and jackets?
Humidity averages about 82% and falls from above 90% before sunrise to about 60% on dry afternoons, so creasing and sweat concentrate on the journey, not at the desk.
MSS gives an annual mean relative humidity of about 82%, and humidity often reaches 100% during prolonged rain. The practical reading is to protect the outer layer in transit. Carry the jacket on a hanger or folded over the arm, wear a breathable shirt or blouse in a loose cut, and keep the second layer for the room where the meeting happens. Lightweight, unlined or half-lined pieces suit the walk better than heavy weaves.
Source: Meteorological Service Singapore, November 2026
Are hotter years changing what counts as sensible office wear?
High heat stress days rose from 21 in 2024 to 29 in 2025, an increase of 8 days or about 38%, and the extra heat arrives outdoors, on the commute.
NEA and MSS count a high heat stress day when any hourly average Wet Bulb Globe Temperature (WBGT) at a station reaches 33°C or more. The 2024 count was 21 days, mostly in March, April and May. The 2025 count was 29 days. Both counts use the same 33°C threshold, so the 8-day rise is a like-for-like comparison. Heat stress days are recorded outdoors at monitoring stations, while indoor expectations have not changed, so the layered approach above still applies.
Source: Meteorological Service Singapore, November 2026
Each business setting sets a formality tier that you match or exceed
Match or exceed the host's tier: business formal for finance, law and the courts, business casual for most offices, smart casual for creative and technology teams, and the work-site rules for anything outdoors.
Business formal means a tailored suit or equivalent with closed shoes. Business casual means a collared shirt or blouse with tailored trousers or a skirt, and no jacket needed. Smart casual means clean, pressed, non-sportswear clothing without a jacket. The table separates published rules from Aemorph's guidance, so a reader sees which row is a requirement and which is a judgement.
| Setting | Tier | What to wear | Climate adjustment | Basis |
|---|---|---|---|---|
| Client meeting, finance, law or government | Business formal | Suit or tailored equivalent, closed shoes | Unlined or half-lined jacket carried until the meeting | Aemorph guidance |
| Client meeting, technology or creative | Smart casual | Pressed shirt or blouse, tailored trousers, clean shoes | Breathable fabric, loose cut | Aemorph guidance |
| Court visit | Business wear, smart casual wear or traditional dress | Neat clothing that reads as business or smart casual | Breathable fabric for the journey | Published rule: Singapore Judiciary |
| Job interview | Host's tier plus one step | Match the company's tier, then add a jacket or tie | Dress cool for the journey, change layers at the door | Aemorph guidance |
| Everyday office | Business casual | Collared shirt or blouse, tailored trousers or skirt | A cardigan at the desk for a 25°C room | Aemorph guidance |
| Casual Friday | Written company policy decides | Neat, plain clothing; jeans only where the policy allows | Same fabric rules as other days | Company policy |
| Outdoor site visit | Site rules first | Closed shoes, loose light-coloured clothing | Hat and water; follow the site briefing | MOM recommended practice for workers; visitor items are Aemorph guidance |
Dress tier by business setting in Singapore, with the basis for each row, checked 5 November 2026.
Source: Singapore Judiciary, January 2026
Source: Ministry of Manpower, August 2026
What is the dress code for visiting a Singapore court?
Dress in business wear, smart casual wear or traditional dress, because visitors whose clothing the courts judge inappropriate, indecent or offensive risk being refused entry.
The Singapore Judiciary's Guide to attending court (last updated 5 January 2026) states this standard for court buildings, courtrooms and chambers. The guide lists no garment-by-garment rule. The first three tiers in the table above meet its wording, so a business formal or business casual outfit is the low-risk choice.
What do you wear to a job interview in Singapore?
Dress to the interviewer's tier and go one step up: business formal for finance, law and corporate roles, business casual where the office is relaxed.
Ask the recruiter what the team wears day to day, or check recent photos of the office on the company's own channels. A jacket worn over a breathable shirt covers the formal case in a warm room. Travel in cooler layers and change at the door, since a creased or damp shirt costs more than a missing tie.
Do Singapore offices accept shorts, sandals and sportswear?
Business settings treat shorts, open sandals, tank tops and athletic wear as below the smart casual tier, so a written policy or the host decides before you try them.
A company that publishes a casual Friday policy sets its own limits, and neat jeans are common where policy allows them. Client-facing days follow the client's tier, whatever the internal policy says.
Site visits and outdoor work follow MOM's heat rules, not office norms
From 1 December 2026, employers are required to provide suitable clothing that mitigates or protects outdoor workers from excessive heat stress, one of four existing recommended practices that MOM makes mandatory on that date.
MOM defines outdoor work as work done primarily in the open without permanent shade. The measures rise with the WBGT reading: below 31°C, from 31°C to below 33°C, and 33°C and above. At 31°C to below 33°C, MOM recommends loose-fitting, light-coloured clothing for workers. The WBGT thresholds are readings on the Wet Bulb Globe Temperature scale, not air temperature. MOM lists NEA's myENV app as the WBGT source for workplaces without on-site meters.
From 5 November 2026, the 1 December 2026 date is 26 days away (25 days left in November plus 1 day). An employer with outdoor staff has that time to buy and issue the clothing. A business owner who brings clients to a site checks the site's own briefing first.
Source: Ministry of Manpower, August 2026
A written dress policy tells staff and visitors which tier applies
A one-page policy that names the tier for each day and meeting type removes the guesswork, and the Go 25 pledge asks employers to make 25°C comfortable for staff, for example by adding fans.
The Singapore Green Building Council's Go 25 pledge commits organisations to three actions: keep an average of 25°C in spaces they directly control, engage employees, tenants and contractors on making 25°C comfortable, and communicate the benefits. A dress policy that mentions the room temperature does the second job in writing.
- Name each tier and describe it in one sentence, as in the table above.
- State which days and meeting types use which tier.
- Give client days an override, so staff dress to the client's tier.
- Mention the indoor temperature and permit a spare layer at the desk.
- For outdoor roles, point to the MOM clothing requirement taking effect on 1 December 2026.
- Name who rules on edge cases.
Staff handbooks are reviewed annually, as the Singapore Employment Law guide advises, and the dress policy belongs in that review.