diff --git a/backend/.gitignore b/backend/.gitignore
index 4d29575..8692cf6 100644
--- a/backend/.gitignore
+++ b/backend/.gitignore
@@ -13,6 +13,7 @@
 
 # misc
 .DS_Store
+.env
 .env.local
 .env.development.local
 .env.test.local
diff --git a/backend/app.js b/backend/app.js
index 74dadf6..385675a 100644
--- a/backend/app.js
+++ b/backend/app.js
@@ -1,4 +1,5 @@
 /* Modules */
+require('dotenv').config();
 const express = require('express');
 const helmet  = require('helmet');
 const cors    = require('cors');
diff --git a/backend/assets/config/config.js b/backend/assets/config/config.js
index 48ec1d3..381683b 100644
--- a/backend/assets/config/config.js
+++ b/backend/assets/config/config.js
@@ -1,5 +1,6 @@
 const config = {
-    PORT: process.env.PORT || 8080
+    PORT: process.env.PORT || 8080,
+    WEATHER_API_KEY: process.env.OpenWeatherMap_API_KEY
 };
 
 module.exports = config;
\ No newline at end of file
diff --git a/backend/assets/functions/functionObject.js b/backend/assets/functions/functionObject.js
index e30bf60..1d1f85f 100644
--- a/backend/assets/functions/functionObject.js
+++ b/backend/assets/functions/functionObject.js
@@ -3,6 +3,7 @@ const { convertArabicToRomanOutput, convertRomanToArabicOutput } = require('./ma
 const { convertDistanceOutput }                                  = require('./main/convertDistance');
 const { convertTemperatureOutput }                               = require('./main/convertTemperature');
 const { armstrongNumberOutput }                                  = require('./main/armstrongNumber');
+const { weatherRequestOutput }                                   = require('./main/weatherRequest');
 
 const functionObject = {
     randomNumber        : randomNumberOutput,
@@ -10,7 +11,8 @@ const functionObject = {
     convertRomanToArabic: convertRomanToArabicOutput,
     convertDistance     : convertDistanceOutput,
     convertTemperature  : convertTemperatureOutput,
-    armstrongNumber     : armstrongNumberOutput
+    armstrongNumber     : armstrongNumberOutput,
+    weatherRequest      : weatherRequestOutput
 };
 
 // Choisi la fonction à exécuter
diff --git a/backend/assets/functions/main/armstrongNumber.js b/backend/assets/functions/main/armstrongNumber.js
index b224f68..6a97008 100644
--- a/backend/assets/functions/main/armstrongNumber.js
+++ b/backend/assets/functions/main/armstrongNumber.js
@@ -38,7 +38,7 @@ exports.armstrongNumberOutput = (res, argsObject) => {
     
     // Si ce n'est pas un nombre
     number = parseInt(number);
-    if (isNaN(number) && number >= 0) {
+    if (isNaN(number) || number <= 0) {
         return sendResponse(res, { result: "Veuillez rentré un nombre valide.", httpStatus: 400 });
     }
 
diff --git a/backend/assets/functions/main/weatherRequest.js b/backend/assets/functions/main/weatherRequest.js
new file mode 100644
index 0000000..877af1b
--- /dev/null
+++ b/backend/assets/functions/main/weatherRequest.js
@@ -0,0 +1,19 @@
+const axios               = require('axios');
+const sendResponse        = require('../../utils/sendResponse');
+const { requiredFields }  = require('../../config/errors');
+const { WEATHER_API_KEY } = require('../../config/config');
+
+/* OUTPUTS */
+exports.weatherRequestOutput = async (res, argsObject) => {
+    let { cityName } = argsObject;
+
+    // S'il n'y a pas les champs obligatoire
+    if (!(cityName)) {
+        return sendResponse(res, requiredFields);
+    }
+
+    // Récupère les données météo grâce à l'API : openweathermap.org.
+    axios.get(`https://api.openweathermap.org/data/2.5/weather?q=${cityName}&lang=fr&units=metric&appid=${WEATHER_API_KEY}`)
+        .then((response) => sendResponse(res, { result: response.data }, true))
+        .catch(() => sendResponse(res, { result: "La ville n'existe pas (dans l'API de openweathermap.org)." }));
+}
\ No newline at end of file
diff --git a/backend/package-lock.json b/backend/package-lock.json
index 636e402..9345010 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -58,6 +58,14 @@
       "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
       "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
     },
+    "axios": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.19.2.tgz",
+      "integrity": "sha512-fjgm5MvRHLhx+osE2xoekY70AhARk3a6hkN+3Io1jc00jtquGvxYlKlsFUhmUET0V5te6CcZI7lcv2Ym61mjHA==",
+      "requires": {
+        "follow-redirects": "1.5.10"
+      }
+    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -342,6 +350,12 @@
         "is-obj": "^1.0.0"
       }
     },
+    "dotenv": {
+      "version": "8.2.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-8.2.0.tgz",
+      "integrity": "sha512-8sJ78ElpbDJBHNeBzUbUVLsqKdccaa/BXF1uPTw3GrvQTBgrQrtObr2mUrE38vzYd8cEv+m/JBfDLioYcfXoaw==",
+      "dev": true
+    },
     "duplexer3": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/duplexer3/-/duplexer3-0.1.4.tgz",
@@ -459,6 +473,24 @@
         "unpipe": "~1.0.0"
       }
     },
+    "follow-redirects": {
+      "version": "1.5.10",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.5.10.tgz",
+      "integrity": "sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==",
+      "requires": {
+        "debug": "=3.1.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        }
+      }
+    },
     "forwarded": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
diff --git a/backend/package.json b/backend/package.json
index 601c728..52c5ca7 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -10,11 +10,13 @@
   "author": "Divlo",
   "license": "MIT",
   "dependencies": {
+    "axios": "^0.19.2",
     "cors": "^2.8.5",
     "express": "^4.17.1",
     "helmet": "^3.21.3"
   },
   "devDependencies": {
+    "dotenv": "^8.2.0",
     "morgan": "^1.9.1",
     "nodemon": "^2.0.2"
   }