Verdict: Fair month
Mérida Weather in September
September is seriously hot in Mérida — days average 33°C (91°F), so plan mornings out and afternoons in the shade or the water. It's also the wet side of the calendar: rain falls on about 18 days, so build flexibility into plans. September is workable in Mérida if your dates are fixed — just plan around the conditions.
Average high
33°C / 91°F
Average low
24°C / 75°F
Rain days
~18
Precipitation
105 mm
What to pack for Mérida in September
- Light, breathable clothing — linen and technical fabrics earn their keep
- High-SPF sunscreen, sunglasses, and a refillable water bottle
- Rain gear is non-negotiable — expect rain on roughly 18 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Mérida: Apr (36°C / 97°F) · Coolest: Jan (29°C / 84°F) · Wettest: Aug (~20 rain days)
29°
19°
Jan
30°
19°
Feb
34°
21°
Mar
36°
23°
Apr
36°
24°
May
34°
24°
Jun
34°
24°
Jul
34°
24°
Aug
33°
24°
Sep
32°
23°
Oct
30°
21°
Nov
29°
20°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)