Weather Almanac: San Juan, TX 78589

🗓️ Historical norms for August 2026

July September

Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.

August avg. precipitation

🌧️ 2.21"

August days below freezing

📉 ≈0.0 days

Average August lows 76°F – 78°F

USDA Zone

10a

Annual extreme lows 30°F to 35°F

Last Spring Frost (36°F)

🌷 Feb 11

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First Fall Frost (36°F)

🍂 Dec 11

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F: Forecast

H: Normal High Temp

L: Normal Low Temp

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Sat. August 1

🌅 6:58 a.m.

H: 94°F – 102°F

L: 75°F – 79°F

🌇 8:19 p.m.

Sun. August 2

🌅 6:58 a.m.

H: 95°F – 102°F

L: 75°F – 79°F

🌇 8:18 p.m.

Mon. August 3

🌅 6:59 a.m.

H: 95°F – 102°F

L: 75°F – 79°F

🌇 8:17 p.m.

Tue. August 4

🌅 6:59 a.m.

H: 95°F – 102°F

L: 75°F – 79°F

🌇 8:17 p.m.

Wed. August 5

🌅 7:00 a.m.

H: 95°F – 102°F

L: 75°F – 79°F

🌇 8:16 p.m.

Thu. August 6

🌅 7:00 a.m.

H: 95°F – 103°F

L: 75°F – 79°F

🌇 8:15 p.m.

Fri. August 7

🌅 7:01 a.m.

H: 95°F – 103°F

L: 75°F – 79°F

🌇 8:15 p.m.

Sat. August 8

🌅 7:01 a.m.

H: 95°F – 103°F

L: 75°F – 79°F

🌇 8:14 p.m.

Sun. August 9

🌅 7:02 a.m.

H: 95°F – 103°F

L: 75°F – 79°F

🌇 8:13 p.m.

Mon. August 10

🌅 7:02 a.m.

H: 95°F – 103°F

L: 75°F – 79°F

🌇 8:12 p.m.

Tue. August 11

🌅 7:03 a.m.

H: 95°F – 103°F

L: 75°F – 79°F

🌇 8:11 p.m.

Wed. August 12

🌅 7:03 a.m.

H: 95°F – 103°F

L: 75°F – 79°F

🌇 8:11 p.m.

Thu. August 13

🌅 7:04 a.m.

H: 95°F – 103°F

L: 75°F – 79°F

🌇 8:10 p.m.

Fri. August 14

🌅 7:04 a.m.

H: 95°F – 103°F

L: 75°F – 79°F

🌇 8:09 p.m.

Sat. August 15

🌅 7:05 a.m.

H: 95°F – 103°F

L: 75°F – 79°F

🌇 8:08 p.m.

Sun. August 16

🌅 7:05 a.m.

H: 94°F – 103°F

L: 75°F – 79°F

🌇 8:07 p.m.

Mon. August 17

🌅 7:06 a.m.

H: 94°F – 103°F

L: 75°F – 79°F

🌇 8:06 p.m.

Tue. August 18

🌅 7:06 a.m.

H: 94°F – 103°F

L: 75°F – 79°F

🌇 8:05 p.m.

Wed. August 19

🌅 7:07 a.m.

H: 94°F – 103°F

L: 75°F – 79°F

🌇 8:04 p.m.

Thu. August 20

🌅 7:07 a.m.

H: 94°F – 103°F

L: 75°F – 79°F

🌇 8:04 p.m.

Fri. August 21

🌅 7:08 a.m.

H: 94°F – 102°F

L: 75°F – 79°F

🌇 8:03 p.m.

Sat. August 22

🌅 7:08 a.m.

H: 94°F – 102°F

L: 75°F – 79°F

🌇 8:02 p.m.

Sun. August 23

🌅 7:08 a.m.

H: 93°F – 102°F

L: 75°F – 79°F

🌇 8:01 p.m.

Mon. August 24

🌅 7:09 a.m.

H: 93°F – 102°F

L: 74°F – 79°F

🌇 8:00 p.m.

Tue. August 25

🌅 7:09 a.m.

H: 93°F – 102°F

L: 74°F – 79°F

🌇 7:59 p.m.

Wed. August 26

🌅 7:10 a.m.

H: 93°F – 102°F

L: 74°F – 79°F

🌇 7:58 p.m.

Thu. August 27 Lyndon Baines Johnson Day

🌅 7:10 a.m.

H: 93°F – 102°F

L: 74°F – 79°F

🌇 7:57 p.m.

Fri. August 28

🌅 7:11 a.m.

H: 93°F – 102°F

L: 74°F – 79°F

🌇 7:56 p.m.

Sat. August 29

🌅 7:11 a.m.

H: 92°F – 101°F

L: 74°F – 79°F

🌇 7:55 p.m.

Sun. August 30

🌅 7:11 a.m.

H: 92°F – 101°F

L: 74°F – 78°F

🌇 7:54 p.m.

Mon. August 31

🌅 7:12 a.m.

H: 92°F – 101°F

L: 74°F – 78°F

🌇 7:53 p.m.

July September

Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.

Temperature climatic data from weather station: MCALLEN MILLER INTL AP (USW00012959)

Precipitation climatic data from weather station: MCALLEN MILLER INTL AP (USW00012959)

Agricultural climatic data from weather station: MCALLEN MILLER INTL AP (USW00012959)