Monthly climate averages for Arin, Peru. Based on 10-year ERA5 reanalysis data.
Cwb Subtropical Highland
Climate OverviewArin, Peru in May has mild conditions, with highs averaging 18.8°C (66°F) and noticeably cooler mornings. Rain falls on about 13 days this month.
This month falls at the end of Autumn.
Temperatures remain fairly steady throughout May, with daily highs around 19°C (66°F).
Rainfall is heaviest during the first third of the month, while the last third tends to be drier.
The warmest days tend to fall around the 31th, averaging 19.2°C (67°F).
Compared to April, this month is about 0°C cooler with 8 fewer rainy days.
Daily averages based on historical data (2016–2025)
Keep afternoons flexible as tropical showers are common — they typically clear within an hour.
Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.
1 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 19°C / 12°C | 21°C / 12°C | 29days (237 mm) Wet | 9h Good | 84% Humid | 7.6 Very High | Wet | View Details |
| February | 19°C / 13°C | 21°C / 13°C | 28days (240 mm) Wet | 8.2h Good | 86% Very Muggy | 7.6 Very High | Wet | View Details |
| March | 19°C / 12°C | 20°C / 12°C | 28days (209 mm) Wet | 8.8h Good | 85% Humid | 6.8 High | Wet | View Details |
| April | 19°C / 12°C | 20°C / 12°C | 21days (109 mm) Wet | 9.7h Good | 82% Humid | 7.5 Very High | Wet | View Details |
| May | 19°C / 11°C | 19°C / 11°C | 13days (52 mm) Wet | 10.1h Excellent | 77% Humid | 7.3 Very High | Good | View Details |
| June best | 19°C / 11°C | 18°C / 10°C | 5days (19 mm) Good | 10h Excellent | 70% Muggy | 7 High | Excellent | View Details |
| July best | 20°C / 10°C | 18°C / 9°C | 5days (21 mm) Good | 10h Excellent | 66% Muggy | 7.6 Very High | Excellent | View Details |
| August | 20°C / 10°C | 19°C / 10°C | 11days (35 mm) Wet | 10.4h Excellent | 67% Muggy | 8.4 Very High | Good | View Details |
| September | 20°C / 11°C | 20°C / 11°C | 19days (70 mm) Wet | 10.6h Excellent | 72% Muggy | 8.7 Very High | Wet | View Details |
| October | 20°C / 12°C | 21°C / 12°C | 26days (141 mm) Wet | 10.2h Excellent | 77% Humid | 8.8 Very High | Wet | View Details |
| November | 20°C / 13°C | 21°C / 13°C | 27days (172 mm) Wet | 9.5h Good | 79% Humid | 8.5 Very High | Wet | View Details |
| December | 20°C / 12°C | 21°C / 13°C | 29days (248 mm) Wet | 9h Good | 83% Humid | 8.2 Very High | Wet | View Details |
Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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