TONIGHT: Partly cloudy, warm, overnight lows low to mid 60s. SATURDAY: Sunny and warm again, highs near 80 along the Canadian border, near 90 again near the North-South Dakota border. SUNDAY: Chances of showers and thunderstorms, best chances central North Dakota, northeast North Dakota, northwest Minnesota. Cooler, with highs mid to upper 60sMONDAY: Daytime highs drop to the upper 50s to 60, lows drop into the mid 30s. High temps mid-80s in the borderland to near 90 in southeast North Dakota.