Pacific Coast (Lima) works in any month. Every month of the year rates go on daytime heat and rainfall, so timing is down to crowds and price rather than weather.
Desert coast; grey 'garúa' May–Oct
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 23.2 | 74 | 2% | Go |
| February | 23.9 | 75 | 2% | Go |
| March | 24.1 | 75 | 2% | Go |
| April | 23.6 | 74 | 0% | Go |
| May | 22.9 | 73 | 0% | Go |
| June | 22.1 | 72 | 0% | Go |
| July | 21.7 | 71 | 0% | Go |
| August | 21.8 | 71 | 0% | Go |
| September | 21.9 | 71 | 1% | Go |
| October | 21.9 | 71 | 2% | Go |
| November | 22.0 | 72 | 1% | Go |
| December | 22.5 | 72 | 1% | Go |
Verdict combines mean daytime high with rainy-day frequency. “Rainy days” is the share of days in the month with at least 1 mm of rain.
April is the driest month, with rain on 0% of days and daytime highs near 23.6°C (74°F). January is the wettest, at 2%. Temperature barely moves all year — just 2.4°C between the warmest and coolest months — so rainfall, not heat, decides when to go.