Tried to show images with your flow.
Using openweathermap png icons. They have really bad choice of colors, i can't see any background color for such to let them stand out. So pretty unusable icons.
Also it takes to have separate dataset created for icons to rise them above the temperature line. This can be avoided by creating custom icons (png-s) which are created with vertical offset. Then the icons can be shown as part of temperature dataset.
The icons with separate dataset also create entry for tooltip and legend and there is no way in to filter out any dataset to be not shown.
But overall it is highly possible to create such stuff. 
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images\niconchoice.forEach(icon => createImages(icon));\n\nfunction createImages(icon){\n var img = new Image()\n img.src = \"http://openweathermap.org/img/wn/\"+icon+'.png';\n img.onload = onImageLoaded \n iconimages.push(img);\n}\n\n// images should be preloaded before feeding them into chart\nfunction onImageLoaded(){\n loadedcount ++\n if(iconcount == loadedcount){\n createChart()\n }\n}\n\n\n\n// createChart()\nfunction createChart(){\n var ctx = document.getElementById('myChart').getContext('2d');\n var chart = new Chart(ctx, {\n \n // The type of chart we want to create\n type: 'bar',\n\n // The data for our dataset\n data: {\n labels: {{{payload.labels}}},\n datasets: [\n {\n type:'line',\n label: 'Temperatur [°C]',\n backgroundColor: linecolors[0],\n borderColor: linecolors[0],\n data: {{{payload.temperature}}},\n yAxisID: 'left-y-axis',\n steppedLine: false,\n fill: false,\n borderWidth: 1\n },\n {\n type:'bar',\n label: 'Niederschlag [mm/m²]',\n backgroundColor: 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\"dt_txt\":\"2020-11-16 15:00:00\"\n },\n {\n \"dt\":1605549600,\n \"main\":{\n \"temp\":10.27,\n \"feels_like\":5.8,\n \"temp_min\":10.27,\n \"temp_max\":10.32,\n \"pressure\":1012,\n \"sea_level\":1012,\n \"grnd_level\":1012,\n \"humidity\":89,\n \"temp_kf\":-0.05\n },\n \"weather\":[\n {\n \"id\":500,\n \"main\":\"Rain\",\n \"description\":\"Leichter Regen\",\n \"icon\":\"10n\"\n }\n ],\n \"clouds\":{\n \"all\":94\n },\n \"wind\":{\n \"speed\":5.91,\n \"deg\":246\n },\n \"visibility\":10000,\n \"pop\":0.97,\n \"rain\":{\n \"3h\":0.77\n },\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-16 18:00:00\"\n },\n {\n \"dt\":1605560400,\n \"main\":{\n \"temp\":8.7,\n \"feels_like\":4.75,\n \"temp_min\":8.6,\n \"temp_max\":8.7,\n \"pressure\":1015,\n \"sea_level\":1015,\n \"grnd_level\":1014,\n \"humidity\":93,\n \"temp_kf\":0.1\n },\n \"weather\":[\n {\n \"id\":803,\n \"main\":\"Clouds\",\n \"description\":\"Überwiegend bewölkt\",\n \"icon\":\"04n\"\n }\n ],\n \"clouds\":{\n \"all\":54\n },\n \"wind\":{\n \"speed\":4.86,\n \"deg\":242\n },\n \"visibility\":10000,\n \"pop\":0.24,\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-16 21:00:00\"\n },\n {\n \"dt\":1605571200,\n \"main\":{\n \"temp\":7.72,\n \"feels_like\":3.65,\n \"temp_min\":7.7,\n \"temp_max\":7.72,\n \"pressure\":1018,\n \"sea_level\":1018,\n \"grnd_level\":1016,\n \"humidity\":93,\n \"temp_kf\":0.02\n },\n \"weather\":[\n {\n \"id\":803,\n \"main\":\"Clouds\",\n \"description\":\"Überwiegend bewölkt\",\n \"icon\":\"04n\"\n }\n ],\n \"clouds\":{\n \"all\":56\n },\n \"wind\":{\n \"speed\":4.71,\n \"deg\":230\n },\n \"visibility\":10000,\n \"pop\":0.18,\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-17 00:00:00\"\n },\n {\n \"dt\":1605582000,\n \"main\":{\n \"temp\":6.84,\n \"feels_like\":2.59,\n \"temp_min\":6.84,\n \"temp_max\":6.84,\n \"pressure\":1018,\n \"sea_level\":1018,\n \"grnd_level\":1017,\n \"humidity\":91,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":803,\n \"main\":\"Clouds\",\n \"description\":\"Überwiegend bewölkt\",\n \"icon\":\"04n\"\n }\n ],\n \"clouds\":{\n \"all\":84\n },\n \"wind\":{\n \"speed\":4.6,\n \"deg\":224\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-17 03:00:00\"\n },\n {\n \"dt\":1605592800,\n \"main\":{\n \"temp\":7.93,\n \"feels_like\":3.3,\n \"temp_min\":7.93,\n \"temp_max\":7.93,\n \"pressure\":1019,\n \"sea_level\":1019,\n \"grnd_level\":1017,\n \"humidity\":89,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":500,\n \"main\":\"Rain\",\n \"description\":\"Leichter Regen\",\n \"icon\":\"10n\"\n }\n ],\n \"clouds\":{\n \"all\":92\n },\n \"wind\":{\n \"speed\":5.37,\n \"deg\":211\n },\n \"visibility\":10000,\n \"pop\":0.2,\n \"rain\":{\n \"3h\":0.16\n },\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-17 06:00:00\"\n },\n {\n \"dt\":1605603600,\n \"main\":{\n \"temp\":9.62,\n \"feels_like\":4.64,\n \"temp_min\":9.62,\n \"temp_max\":9.62,\n \"pressure\":1019,\n \"sea_level\":1019,\n \"grnd_level\":1017,\n \"humidity\":92,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":500,\n \"main\":\"Rain\",\n \"description\":\"Leichter Regen\",\n \"icon\":\"10d\"\n }\n ],\n \"clouds\":{\n \"all\":100\n },\n \"wind\":{\n \"speed\":6.59,\n \"deg\":222\n },\n \"visibility\":10000,\n \"pop\":0.83,\n \"rain\":{\n \"3h\":0.5\n },\n \"sys\":{\n \"pod\":\"d\"\n },\n \"dt_txt\":\"2020-11-17 09:00:00\"\n },\n {\n \"dt\":1605614400,\n \"main\":{\n \"temp\":11.25,\n \"feels_like\":6.86,\n \"temp_min\":11.25,\n \"temp_max\":11.25,\n \"pressure\":1020,\n \"sea_level\":1020,\n \"grnd_level\":1018,\n \"humidity\":91,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":500,\n \"main\":\"Rain\",\n \"description\":\"Leichter Regen\",\n \"icon\":\"10d\"\n }\n ],\n \"clouds\":{\n \"all\":100\n },\n \"wind\":{\n \"speed\":6.27,\n \"deg\":235\n },\n \"visibility\":10000,\n \"pop\":0.74,\n \"rain\":{\n \"3h\":0.12\n },\n \"sys\":{\n \"pod\":\"d\"\n },\n \"dt_txt\":\"2020-11-17 12:00:00\"\n },\n {\n \"dt\":1605625200,\n \"main\":{\n \"temp\":11.38,\n \"feels_like\":7.16,\n \"temp_min\":11.38,\n \"temp_max\":11.38,\n \"pressure\":1021,\n \"sea_level\":1021,\n \"grnd_level\":1019,\n \"humidity\":89,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":804,\n \"main\":\"Clouds\",\n \"description\":\"Bedeckt\",\n \"icon\":\"04d\"\n }\n ],\n \"clouds\":{\n \"all\":100\n },\n \"wind\":{\n \"speed\":5.95,\n \"deg\":232\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"d\"\n },\n \"dt_txt\":\"2020-11-17 15:00:00\"\n },\n {\n \"dt\":1605636000,\n \"main\":{\n \"temp\":11.31,\n \"feels_like\":7.17,\n \"temp_min\":11.31,\n \"temp_max\":11.31,\n \"pressure\":1022,\n \"sea_level\":1022,\n \"grnd_level\":1020,\n \"humidity\":89,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":804,\n \"main\":\"Clouds\",\n \"description\":\"Bedeckt\",\n \"icon\":\"04n\"\n }\n ],\n \"clouds\":{\n \"all\":100\n },\n \"wind\":{\n \"speed\":5.81,\n \"deg\":231\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-17 18:00:00\"\n },\n {\n \"dt\":1605646800,\n \"main\":{\n \"temp\":11.25,\n \"feels_like\":6.76,\n \"temp_min\":11.25,\n \"temp_max\":11.25,\n \"pressure\":1023,\n \"sea_level\":1023,\n \"grnd_level\":1021,\n \"humidity\":88,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":804,\n \"main\":\"Clouds\",\n \"description\":\"Bedeckt\",\n \"icon\":\"04n\"\n }\n ],\n \"clouds\":{\n \"all\":100\n },\n \"wind\":{\n \"speed\":6.23,\n \"deg\":235\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-17 21:00:00\"\n },\n {\n \"dt\":1605657600,\n \"main\":{\n \"temp\":10.41,\n \"feels_like\":6.27,\n \"temp_min\":10.41,\n \"temp_max\":10.41,\n \"pressure\":1023,\n \"sea_level\":1023,\n \"grnd_level\":1022,\n \"humidity\":89,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":804,\n \"main\":\"Clouds\",\n \"description\":\"Bedeckt\",\n \"icon\":\"04n\"\n }\n ],\n \"clouds\":{\n \"all\":98\n },\n \"wind\":{\n \"speed\":5.48,\n \"deg\":236\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-18 00:00:00\"\n },\n {\n \"dt\":1605668400,\n \"main\":{\n \"temp\":10.34,\n \"feels_like\":6.61,\n \"temp_min\":10.34,\n \"temp_max\":10.34,\n \"pressure\":1023,\n \"sea_level\":1023,\n \"grnd_level\":1022,\n \"humidity\":88,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":804,\n \"main\":\"Clouds\",\n \"description\":\"Bedeckt\",\n \"icon\":\"04n\"\n }\n ],\n \"clouds\":{\n \"all\":97\n },\n \"wind\":{\n \"speed\":4.82,\n \"deg\":226\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-18 03:00:00\"\n },\n {\n \"dt\":1605679200,\n \"main\":{\n \"temp\":9.63,\n \"feels_like\":5.49,\n \"temp_min\":9.63,\n \"temp_max\":9.63,\n \"pressure\":1023,\n \"sea_level\":1023,\n \"grnd_level\":1022,\n \"humidity\":87,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":804,\n \"main\":\"Clouds\",\n \"description\":\"Bedeckt\",\n \"icon\":\"04n\"\n }\n ],\n \"clouds\":{\n \"all\":97\n },\n \"wind\":{\n \"speed\":5.1,\n \"deg\":219\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-18 06:00:00\"\n },\n {\n \"dt\":1605690000,\n \"main\":{\n \"temp\":9.53,\n \"feels_like\":5.3,\n \"temp_min\":9.53,\n \"temp_max\":9.53,\n \"pressure\":1023,\n \"sea_level\":1023,\n \"grnd_level\":1021,\n \"humidity\":84,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":802,\n \"main\":\"Clouds\",\n \"description\":\"Mäßig bewölkt\",\n \"icon\":\"03d\"\n }\n ],\n \"clouds\":{\n \"all\":40\n },\n \"wind\":{\n \"speed\":5.04,\n \"deg\":211\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"d\"\n },\n \"dt_txt\":\"2020-11-18 09:00:00\"\n },\n {\n \"dt\":1605700800,\n \"main\":{\n \"temp\":11.17,\n \"feels_like\":7.28,\n \"temp_min\":11.17,\n \"temp_max\":11.17,\n \"pressure\":1022,\n \"sea_level\":1022,\n \"grnd_level\":1020,\n \"humidity\":78,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":803,\n \"main\":\"Clouds\",\n \"description\":\"Überwiegend bewölkt\",\n \"icon\":\"04d\"\n }\n ],\n \"clouds\":{\n \"all\":65\n },\n \"wind\":{\n \"speed\":4.72,\n \"deg\":206\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"d\"\n },\n \"dt_txt\":\"2020-11-18 12:00:00\"\n },\n {\n \"dt\":1605711600,\n \"main\":{\n \"temp\":9.51,\n \"feels_like\":5.95,\n \"temp_min\":9.51,\n \"temp_max\":9.51,\n \"pressure\":1019,\n \"sea_level\":1019,\n \"grnd_level\":1018,\n \"humidity\":84,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":802,\n \"main\":\"Clouds\",\n \"description\":\"Mäßig bewölkt\",\n \"icon\":\"03d\"\n }\n ],\n \"clouds\":{\n \"all\":33\n },\n \"wind\":{\n \"speed\":4.07,\n \"deg\":186\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"d\"\n },\n \"dt_txt\":\"2020-11-18 15:00:00\"\n },\n {\n \"dt\":1605722400,\n \"main\":{\n \"temp\":8.52,\n \"feels_like\":4.62,\n \"temp_min\":8.52,\n \"temp_max\":8.52,\n \"pressure\":1018,\n \"sea_level\":1018,\n \"grnd_level\":1016,\n \"humidity\":88,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":802,\n \"main\":\"Clouds\",\n \"description\":\"Mäßig bewölkt\",\n \"icon\":\"03n\"\n }\n ],\n \"clouds\":{\n \"all\":31\n },\n \"wind\":{\n \"speed\":4.46,\n \"deg\":186\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"n\"\n },\n \"dt_txt\":\"2020-11-18 18:00:00\"\n },\n {\n \"dt\":1605733200,\n \"main\":{\n \"temp\":8.94,\n \"feels_like\":4.58,\n \"temp_min\":8.94,\n \"temp_max\":8.94,\n \"pressure\":1016,\n \"sea_level\":1016,\n \"grnd_level\":1014,\n \"humidity\":83,\n \"temp_kf\":0\n },\n \"weather\":[\n {\n \"id\":804,\n \"main\":\"Clouds\",\n \"description\":\"Bedeckt\",\n \"icon\":\"04n\"\n }\n ],\n \"clouds\":{\n \"all\":99\n },\n \"wind\":{\n \"speed\":4.98,\n \"deg\":191\n },\n \"visibility\":10000,\n \"pop\":0,\n \"sys\":{\n \"pod\":\"n\"\n },\n 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EDIT:
Just discovered that there is another set of icons , slightly better but still not may cup of tea 
img.src = "http://openweathermap.org/img/w/"+icon+".png";
