SG Weather — Free Singapore Real-Time Weather Data API (No Key)

TL;DR

The SG Weather API from data.gov.sg provides real-time environmental readings across Singapore, sourced from the Meteorological Service Singapore sensor network. Endpoints cover air temperature, rainfall, relative humidity, wind direction/speed, and PSI readings. Data is refreshed every 5 minutes from over 60 weather stations island-wide. No API key is required. Perfect for building local weather apps, smart home systems, or environmental dashboards specific to Singapore.

Quick start: https://api.data.gov.sg/v1/environment/air-temperature

No API key needed — just make a request!

How to Use This API

1. Air Temperature Readings

https://api.data.gov.sg/v1/environment/air-temperature

2. Rainfall Across Singapore

https://api.data.gov.sg/v1/environment/rainfall

3. 24-Hour PSI and PM2.5

https://api.data.gov.sg/v1/environment/psi

4. Wind Speed and Direction

https://api.data.gov.sg/v1/environment/wind-speed

5. JavaScript — Live Temperature Map

fetch('https://api.data.gov.sg/v1/environment/air-temperature')
  .then(r => r.json())
  .then(data => {
    data.items[0].readings.forEach(r => {
      console.log(`${r.station_id}: ${r.value}°C`);
    });
  });

6. Python — Check if It's Raining

import requests

data = requests.get(
    'https://api.data.gov.sg/v1/environment/rainfall'
).json()

total = sum(r['value'] for r in data['items'][0]['readings'])
stations_with_rain = [r for r in data['items'][0]['readings'] if r['value'] > 0]
print(f"Stations reporting rain: {len(stations_with_rain)}")
print(f"Total rainfall across all stations: {total}mm")

Current temperature: https://api.data.gov.sg/v1/environment/air-temperature

Try This URL Now

Frequently Asked Questions

What environmental endpoints are available?: Endpoints include: air-temperature, rainfall, humidity, wind-direction, wind-speed, pm25, psi, and uv-index. All under /v1/environment/.
How many weather stations are there?: The API covers over 60 weather stations distributed across Singapore, from Changi to Tuas, providing localized readings for different parts of the island.
How often is the data refreshed?: Sensor readings are updated approximately every 5 minutes. The API returns the most recent 30-minute window of data from each station.
Can I get historical data?: The API supports a date parameter for historical queries: ?date=2026-01-15 returns data for a specific date. Data is stored for a limited time.
What format is the response?: All responses use JSON. The structure includes api_info (status), items (array of time-stamped readings), and metadata (station names and locations).
Do I need an API key?: No. The data.gov.sg API is open to all without registration. Just make a GET request to the desired endpoint.

API Details

API URL: https://api.data.gov.sg/v1/environment
Documentation: data.gov.sg
Category: Weather
Authentication: Not Required
Geographic Coverage: Singapore (SG) — island-wide sensor network

What You Can Build

Singapore-specific weather dashboard with island-wide station map
Rain alert system that notifies when your area has precipitation
Jogging route planner that checks temperature and PSI by district
Smart home automation that closes windows when rain is detected
Haze monitoring app tracking PM2.5 and PSI across Singapore