Best time to visit Colonia del Sacramento

Re-score for me — drag the dial — every chart on the page recolours live for your heat limit 27°C
I'm comfortable up to 27°C feels-like
22° heat-averse 30° heat-loving

Default 27 °C is the upper edge of the Holiday Climate Index "ideal comfort" band (Scott, Rutty, Amelung & Tang, 2016). Above this, most warm-tourism travellers report measurable discomfort.

Saved to this browser. Changes update the strips below.
Recent · 2020-2024
Interest Google Trends 2021-2025 searches, not arrivals (?)
Day · avg daily high (?)
Night · avg overnight low (?)
UV index · On a typical day around midday, UV is about this (?)
1110853223571011
On the sunniest 1 in 10 days, UV reaches this — and even higher
1312106437101213
PM2.5 air quality · on a typical day (?)
565546656555
On the worst 1 in 10 days, PM2.5 reaches this — and even higher
9109771211710788
November 9/10 feels 24°C (+1°C vs 1991-2020) · HCI 93/100
Day 25° · Night 17° · cools 8° at night ☀ UV 9.5 (very high) 54% humidity 26 km/h wind 7 rain days (69h) 260h sun
Thermal 10
Sky 10
Rain 9
Wind 9

Higher = better, including rain & wind (green = "doesn't hurt the score", not "lots of it").

How is this scored? HCI / Steadman / CCI gate — full methodology and citations below.

Compare with another destination

Add as many as you like — stacked below the main strips above. Each row is just the recent-window score strip and (for beach destinations) sea-temperature strip.

Tours in Colonia del Sacramento

6 top-rated tours via Viator. Booking links earn this site a commission at no cost to you. Map locations are approximate (centred on Colonia del Sacramento).

  1. 1Authentic Colony on Walking Tour of Its Historic Quarter5.00★ (1)1hfrom $20
  2. 2Private one-day visit to 2 Wineries in Carmelo5.00★ (1)from $370
  3. 3Private Walking Tour of Historic Quarter Colonia del Sacramento1h 30mfrom $60
  4. 4Private Have It Your Way Tour in Colonia del Sacramento5.00★ (4)from $290
  5. 5Private Old City Birdwatching5.00★ (7)3hfrom $140
  6. 6Full Day Birdwatching and Nature Tour5.00★ (7)8hfrom $250

Last refreshed 2026-06-24.

Similar climatesBuenos Aires98% · Montevideo95% · Canberra90%

Other destinations with the most-alike year-round climate to Colonia del Sacramento (apparent temperature, rain hours, sunshine — matched within the same trip-profile). The ±N chip compares each match's typical score for the current month against Colonia del Sacramento's. Based on the 2020-2024 climatology, not this year's actual weather.

Month-by-month

Month Temp °C Feels °C Rain days Rain h Rain h/day Humidity Wind km/h Sun h UV Interest Score
Jan 21–29 29 9 81 9.0 55% 25 284 11 Quiet 8
Feb 20–27 28 9 97 10.8 58% 23 244 10 Quiet 8
Mar 19–26 26 9 106 11.8 64% 23 237 8 Quiet 8
Apr 15–22 21 9 95 10.6 66% 22 199 5 Quiet 8
May 11–17 15 6 71 11.8 68% 23 187 3 Quiet 8
Jun 9–15 13 6 66 11.0 73% 21 168 2 Quiet 7
Jul 8–15 12 7 65 9.3 70% 22 187 2 Quiet 7
Aug 9–17 14 7 62 8.9 64% 23 194 3 Quiet 8
Sep 11–18 16 6 75 12.5 64% 24 203 5 Quiet 8
Oct 13–21 19 8 77 9.6 58% 25 248 7 Quiet 9
Nov 17–25 24 7 69 9.9 54% 26 260 10 Peak 9
Dec 18–27 26 7 68 9.7 54% 25 289 11 Quiet 9

UV Index in Colonia del Sacramento by Month

UV index in Colonia del Sacramento peaks at 11 (extreme) in January, dropping to 2 (low) in June. January, February, November, December reach very high or extreme levels — apply SPF 50+, wear a hat and protective clothing, and limit direct sun between 11:00 and 17:00.

Best months in detail

November

9/10

17–25°C (feels 24°C) · 7 rain days (69h) · 260 sun hours · 54% humidity · Peak crowd · UV 10 (very high) · sunniest 1 in 10 days reach 12 (extreme)

December

9/10

18–27°C · 7 rain days (68h) · 289 sun hours · 54% humidity · Quiet crowd · UV 11 (very high) · sunniest 1 in 10 days reach 13 (extreme)

October

9/10

13–21°C (feels 19°C) · 8 rain days (77h) · 248 sun hours · 58% humidity · Quiet crowd · UV 7 (high) · sunniest 1 in 10 days reach 10 (very high)

Every month

Show the other 9 months in detail

January

8/10

21–29°C · 9 rain days (81h) · 284 sun hours · 55% humidity · Quiet crowd · UV 11 (extreme) · sunniest 1 in 10 days reach 13 (extreme)

February

8/10

20–27°C · 9 rain days (97h) · 244 sun hours · 58% humidity · Quiet crowd · UV 10 (very high) · sunniest 1 in 10 days reach 12 (extreme)

March

8/10

19–26°C · 9 rain days (106h) · 237 sun hours · 64% humidity · Quiet crowd · UV 8 (high) · sunniest 1 in 10 days reach 10 (very high)

April

8/10

15–22°C (feels 21°C) · 9 rain days (95h) · 199 sun hours · 66% humidity · Quiet crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 6 (high)

May

8/10

11–17°C (feels 15°C) · 6 rain days (71h) · 187 sun hours · 68% humidity · Quiet crowd · UV 3 (low) · sunniest 1 in 10 days reach 4 (moderate)

June

7/10

9–15°C (feels 13°C) · 6 rain days (66h) · 168 sun hours · 73% humidity · Quiet crowd · UV 2 (low)

July

7/10

8–15°C (feels 12°C) · 7 rain days (65h) · 187 sun hours · 70% humidity · Quiet crowd · UV 2 (low) · sunniest 1 in 10 days reach 3 (moderate)

August

8/10

9–17°C (feels 14°C) · 7 rain days (62h) · 194 sun hours · 64% humidity · Quiet crowd · UV 3 (moderate)

September

8/10

11–18°C (feels 16°C) · 6 rain days (75h) · 203 sun hours · 64% humidity · Quiet crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 7 (high)

Frequently asked questions about visiting Colonia del Sacramento

When is the best time to visit Colonia del Sacramento?

November is the highest-scoring month (9/10 on the Holiday Climate Index). Typical conditions: 17–25°C (7 rainy days). The top three months by score are November, December, October.

What is the worst time to visit Colonia del Sacramento?

July is the lowest-scoring month (7/10). Typical conditions: 8–15°C (7 rainy days).

When are crowds lowest in Colonia del Sacramento?

Search-interest seasonality (Google Trends 2021-2025) is lowest in January and peaks in November. Interest tracks both in-trip visitors and lead-time planners, so treat it as a "destination is on people's minds" signal rather than literal arrivals.

Which months in Colonia del Sacramento have good weather but fewer tourists?

October (climate 9/10, crowd index 0) and December (climate 9/10, crowd index 22) — shoulder months with above-average climate and below-median search-interest. Often the best value-for-weather trade.

What is the UV index in Colonia del Sacramento by month?

UV peaks at 11 (extreme) in January and is lowest in June at 2 (low). Monthly peak values: Jan 11, Feb 10, Mar 8, Apr 5, May 3, Jun 2, Jul 2, Aug 3, Sep 5, Oct 7, Nov 10, Dec 11. January, February, November, December reach very high or extreme levels — apply SPF 50+, wear a hat and protective clothing, and limit direct sun between 11:00 and 17:00.

What is the UV index in Colonia del Sacramento in January?

January is the peak UV month in Colonia del Sacramento, with a daily-peak UV index of 11 (extreme). At this level, sunburn can occur in under 20 minutes on unprotected fair skin. Apply SPF 50+, wear protective clothing and a hat, and avoid direct midday sun (11:00–17:00).

How high can UV get in Colonia del Sacramento on the sunniest days?

Most days look like the monthly average, but on the sunniest ~1 in 10 days UV climbs higher than the mean suggests. January is the worst case: typical days average UV 11 (extreme), but the top 10% of days reach UV 13 (extreme) — and even higher. Months where the sunniest days routinely exceed the typical reading: January, February, March, April, May, July, September, October, November, December. Plan sun protection for the worst case, not the average.