The best time to visit Diamantina is from May to September. The most comfortable month is July, with highs of 21.4 °C (71 °F) and 4.9 mm of rain over 1 day. December is the rainiest month (284.2 mm over 17 days), and the summer peak is the high season, with higher prices and big crowds.
Best time to visit, month by month
Diamantina month by month
Temperature and rainfall averages from INMET (updated 2026). The verdict combines thermal comfort and rainfall. Tap a month to see the weather, crowds, prices and what is going on in detail.
| Month | High / Low | Rain | Rainy days | Verdict |
|---|---|---|---|---|
| January | 25.8° / 16.8° | 240.9 mm | 13 | Fair |
| February | 26° / 16.7° | 158.8 mm | 10 | Good |
| March | 25.6° / 16.6° | 179.4 mm | 12 | Fair |
| April | 24.6° / 15.6° | 73.3 mm | 7 | Good |
| May | 23° / 13.6° | 25.3 mm | 3 | Excellent |
| June | 21.9° / 11.9° | 6.6 mm | 1 | Excellent |
| July ★ | 21.4° / 11.3° | 4.9 mm | 1 | Excellent |
| August | 22.9° / 11.8° | 11.8 mm | 2 | Excellent |
| September | 24.5° / 13.6° | 31.4 mm | 4 | Excellent |
| October | 25.5° / 15.3° | 115.1 mm | 9 | Good |
| November | 24.5° / 15.9° | 236.7 mm | 15 | Fair |
| December | 24.9° / 16.5° | 284.2 mm | 17 | Fair |
Hotels in Diamantina
July is the best month and also falls in the high season in Diamantina: the top-rated hotels fill up and rates rise close to the date. Book your room as soon as you have settled on your dates.
Rates change with the dates: confirm the price on Booking.com.
The weather in Diamantina throughout the year
The May to September window brings together the most comfortable months in Diamantina: less rain and pleasant temperatures. July is usually the best month, with highs of 21.4 °C (71 °F), lows of 11.3 °C (52 °F) and only 1 day of rain in the month: good conditions for enjoying outdoor attractions with less risk of downpours.
Summer. In summer (December to February), Diamantina has highs of around 26 °C (79 °F) and lows of 17 °C (63 °F), and it is the wetter season, with about 228 mm of rain spread over about 13 days a month. Temperatures are pleasant for sightseeing all day.
Fall. In fall (March to May), Diamantina has highs of around 24 °C (75 °F) and lows of 15 °C (59 °F), and it is the wetter season, with about 93 mm of rain spread over about 7 days a month. The weather is milder, good for walking and exploring without the summer heat.
Winter. In winter (June to August), Diamantina has highs of around 22 °C (72 °F) and lows of 12 °C (54 °F), and it is the driest time of year, with about 8 mm of rain a month. The weather is milder, good for walking and exploring without the summer heat.
Spring. In spring (September to November), Diamantina has highs of around 25 °C (77 °F) and lows of 15 °C (59 °F), and it is the wetter season, with about 128 mm of rain spread over about 9 days a month. Temperatures are pleasant for sightseeing all day.
What to avoid
There are two periods to think twice about before booking. December is usually the rainiest month, so anyone who prioritizes sun should avoid it. The other is high season (New Year's Eve, Carnival and the July school break), when attractions fill up and prices rise; if you want peace and savings, choose weeks without public holidays. None of this rules out the trip, but it changes the experience and the cost quite a bit.