FPUS64 KBRO 181827 SFTBRO TXZ248>255-351-353>355-451-454-455-182200- Tabular State Forecast for Deep South Texas National Weather Service Brownsville TX 127 PM CDT Mon May 18 2026 ROWS INCLUDE... Daily predominant daytime weather 6AM-6PM Forecast temperatures...early morning low/daytime high Probability of precipitation nighttime 6PM-6AM/daytime 6AM-6PM - indicates temperatures below zero MM indicates missing data FCST FCST FCST FCST FCST FCST FCST Today Tue Wed Thu Fri Sat Sun May 18 May 19 May 20 May 21 May 22 May 23 May 24 ...Lower Texas Coast... Port Mansfield Windy Mocldy Mocldy Tstrms Mocldy Tstrms Tstrms /86 81/85 81/83 80/82 78/83 77/83 77/83 /10 10/00 30/00 00/50 50/40 50/60 60/60 Port Isabel Mocldy Mocldy Mocldy Mocldy Mocldy Mocldy Tstrms /87 81/86 81/86 81/85 80/86 80/85 79/85 /20 10/10 20/00 00/20 50/40 50/40 60/50 South Padre Island Mocldy Mocldy Mocldy Mocldy Mocldy Tstrms Tstrms /85 81/84 81/83 81/83 81/84 80/83 79/82 /20 10/10 20/00 00/20 50/40 50/50 60/50 ...Rio Grande Valley... Brownsville Mocldy Mocldy Mocldy Mocldy Mocldy Mocldy Tstrms /95 81/94 81/92 81/91 80/92 79/91 79/89 /20 10/10 20/00 00/30 50/40 50/40 60/50 Harlingen Windy Mocldy Mocldy Tstrms Mocldy Tstrms Tstrms /96 79/95 79/93 77/91 76/91 77/90 76/89 /20 10/00 20/00 00/50 60/40 50/50 60/60 Raymondville Mocldy Mocldy Mocldy Tstrms Mocldy Tstrms Tstrms /96 79/96 78/93 77/90 75/90 75/89 74/88 /20 10/00 30/10 10/60 60/40 60/60 60/70 Weslaco Mocldy Mocldy Mocldy Tstrms Mocldy Tstrms Tstrms /96 80/96 79/93 78/91 76/91 76/89 75/88 /20 10/10 20/10 10/50 60/30 60/50 60/60 McAllen Mocldy Mocldy Mocldy Tstrms Mocldy Tstrms Tstrms /97 81/97 80/94 78/92 77/92 76/90 75/89 /20 20/10 30/10 10/50 70/30 60/50 60/60 ...Other Deep South Texas Cities... Rio Grande City Mocldy Mocldy Mocldy Mocldy Mocldy Mocldy Mocldy /99 79/98 78/94 76/92 74/92 75/91 74/90 /20 20/10 40/30 40/40 80/20 60/40 70/40 Falfurrias Mocldy Mocldy Mocldy Tstrms Tstrms Tstrms Tstrms /97 80/95 78/93 76/89 74/90 74/87 74/87 /20 10/10 50/30 20/70 70/50 50/70 60/60 Hebbronville Mocldy Mocldy Tstrms Tstrms Mocldy Tstrms Tstrms /95 79/94 77/91 74/87 73/88 73/86 73/85 /20 20/10 50/50 40/60 80/30 50/60 60/50 Zapata Vryhot Mocldy Mocldy Tstrms Mocldy Mocldy Mocldy /100 80/99 79/95 75/92 74/92 74/90 74/89 /20 20/10 50/30 60/60 80/20 50/40 60/30 $$