Is Monterrey sunnier than Harlingen?

Monterrey is the sunnier: about 3,056 hours of sunshine a year versus 2,492 — a difference of 564 hours.

Which is warmer, Monterrey or Harlingen?

Year-round daytime highs are similar: Monterrey averages 30°C (86°F), Harlingen 29°C (84°F).

Which is better in winter (November–February), Monterrey or Harlingen?

Monterrey scores better across November–February: 93/100 average versus 88, with daytime highs around 23°C.

Monterrey vs Harlingen: which is sunnier?

🇲🇽 Mexico vs 🇺🇸 United States · 250 km apart · long-term climate normals (NASA POWER, 2001–2020)

Monterrey is the sunnier overall: about 3,056 hours of sunshine a year to Harlingen's 2,492. Monterrey has the higher Sunshine Score in 7 of 12 months, Harlingen in 5.

Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.

At a glance

	Monterrey	Harlingen
Sunshine hours / year	3,056	2,492
Sunniest month	February (94/100)	January (89/100)
Nov–Feb average score	93/100	88/100
Jun–Aug average score	48/100	67/100
Rain / year	638 mm	646 mm
Peak midday UV	10 (very high)	10 (very high)

Monterrey vs Harlingen month by month

Month	Sunshine Score		Day high °C		Rain mm
Month	Monterrey	Harlingen	Monterrey	Harlingen	Monterrey	Harlingen
January	93	89	21°	22°	20	25
February	94	89	25°	24°	15	22
March	93	88	29°	27°	24	30
April	81	87	33°	30°	40	35
May	52	83	36°	32°	59	57
June	43	63	37°	34°	61	79
July	49	71	36°	33°	87	78
August	52	68	36°	34°	53	44
September	70	67	32°	32°	178	144
October	87	82	30°	30°	55	63
November	93	86	25°	26°	25	39
December	93	88	22°	23°	21	30

The sunnier month by month: Jan Monterrey · Feb Monterrey · Mar Monterrey · Apr Harlingen · May Harlingen · Jun Harlingen · Jul Harlingen · Aug Harlingen · Sep Monterrey · Oct Monterrey · Nov Monterrey · Dec Monterrey.

When to pick which

November–February: Monterrey (average score 93/100 vs 88). Daytime highs are similar (23°C vs 24°C). See the winter sun ranking.
March–May: Harlingen (average score 86/100 vs 75). Monterrey is the warmer, around 33°C daytime highs vs 30°C.
June–August: Harlingen (average score 67/100 vs 48). Monterrey is the warmer, around 36°C daytime highs vs 34°C.
September–October: Monterrey (average score 79/100 vs 75). Daytime highs are similar (31°C vs 31°C).

Full month-by-month guides: Monterrey weather by month · Harlingen weather by month · Best time to visit Mexico · Best time to visit United States.

More comparisons: Monterrey vs Torreón · Monterrey vs Reynosa · Monterrey vs McAllen · Harlingen vs Reynosa · Harlingen vs McAllen · Harlingen vs Corpus Christi · all head-to-heads