How can I pass the latitude and longitude data from CLLocationManager delegate to forecastURL

//
//  ViewController.swift
//  My Weather
//
//

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {


    @IBOutlet weak var iconLabel: UIImageView!
    @IBOutlet weak var currentTimeLabel: UILabel!
    @IBOutlet weak var temperatureLabel: UILabel!
    @IBOutlet weak var humidityLabel: UILabel!
    @IBOutlet weak var precipitationLabel: UILabel!
    @IBOutlet weak var summaryLabel: UILabel!
    @IBOutlet weak var refreshButton: UIButton!
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!

    var locationManager: CLLocationManager!
    var geoCoder : CLGeocoder!
    var placemark : CLPlacemark!

    var latitude : String!
    var longitude : String!


    private let apiKey = "a6c333308f623f3118bd566ee78d159c"

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        self.activityIndicator.hidden = true;
        self.getCurrentWeatherData()

        self.locationManager = CLLocationManager()
        locationManager.requestAlwaysAuthorization()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.startMonitoringSignificantLocationChanges()

        geoCoder = CLGeocoder()
        placemark = CLPlacemark()

    }

    func getCurrentWeatherData() -> Void {

//        println("longitude \(latitude)")
//        println("latitude \(longitude)")

        let baseURL = NSURL(string: "https://api.forecast.io/forecast/\(apiKey)/")
        let forecastURL = NSURL(string:"3.0920,101.4943?units=si", relativeToURL: baseURL)

        let sharedSession = NSURLSession.sharedSession()
        let downloadTask : NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL, completionHandler: { (location:NSURL!, response:NSURLResponse!, error:NSError!) -> Void in

            if (error == nil)
            {

                let dataObject = NSData.dataWithContentsOfURL(location, options: nil, error: nil)
                let weatherDictionary : NSDictionary = NSJSONSerialization.JSONObjectWithData(dataObject, options: nil, error: nil) as NSDictionary
                let currentWeather = Current(weatherDictionary: weatherDictionary)

                dispatch_async(dispatch_get_main_queue(), { () -> Void in
                    self.iconLabel.image = currentWeather.icon!
                    self.currentTimeLabel.text = currentWeather.currentTime!
                    self.temperatureLabel.text = "\(currentWeather.temperature)"
                    self.humidityLabel.text = "\(currentWeather.precipProbability)"
                    self.summaryLabel.text = currentWeather.summary

                    // Stop refresh animation
                    self.activityIndicator.stopAnimating()
                    self.activityIndicator.hidden = true
                    self.refreshButton.hidden = false
                })

            }

            else {

                let networkIssueAlert = UIAlertController(title: "Network Error", message: "Please connected to the internet to get latest weather data", preferredStyle: .Alert)
                let okButton = UIAlertAction(title: "OK", style: .Default, handler: nil)
                networkIssueAlert.addAction(okButton)
                let cancelButton = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
                networkIssueAlert.addAction(cancelButton)
                self.presentViewController(networkIssueAlert, animated: true, completion: nil)

                dispatch_async(dispatch_get_main_queue(), { () -> Void in

                    // Stop refresh animation
                    self.activityIndicator.stopAnimating()
                    self.activityIndicator.hidden = true
                    self.refreshButton.hidden = false
                })

            }
        })

        downloadTask.resume()

    }



    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
        println("error to get location : \(error)")
    }



    func locationManager(manager: CLLocationManager!, didUpdateToLocation newLocation: CLLocation!, fromLocation oldLocation: CLLocation!) {

        let currentLocation : CLLocation = newLocation


            latitude = "\(currentLocation.coordinate.latitude)"
            longitude = "\(currentLocation.coordinate.longitude)"
            println("longitude \(self.latitude)")
            println("latitude \(self.longitude)")


    }



    @IBAction func refresh(sender: AnyObject) {

        self.getCurrentWeatherData()
        self.refreshButton.hidden = true
        self.activityIndicator.hidden = false
        self.activityIndicator.startAnimating()

    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}