Best time to visit Mont Saint-Michel

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 (?)
112456554211
On the sunniest 1 in 10 days, UV reaches this — and even higher
378773
PM2.5 air quality · on a typical day (?)
899877566679
On the worst 1 in 10 days, PM2.5 reaches this — and even higher
1718171312126810101417
August 7/10 feels 23°C (+2°C vs 1991-2020) · HCI 74/100
Day 23° · Night 15° 68% humidity 19 km/h wind 12 rain days (147h) 245h sun
Thermal 8
Sky 7
Rain 6
Wind 10

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.

Similar climatesHonfleur97% · Rouen96% · Bruges94%

Other destinations with the most-alike year-round climate to Mont Saint-Michel (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 Mont Saint-Michel'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 4–9 5 16 181 11.3 82% 22 102 1 Quiet 4
Feb 5–11 7 13 160 12.3 77% 25 110 1 Quiet 4
Mar 6–13 9 16 179 11.2 71% 23 176 2 Quiet 5
Apr 7–15 12 11 125 11.4 64% 21 227 4 Quiet 6
May 10–18 16 13 164 12.6 65% 21 258 5 Moderate 6
Jun 13–21 20 13 148 11.4 68% 18 266 6 Moderate 7
Jul 15–22 22 13 157 12.1 66% 20 268 5 Busy 7
Aug 15–23 23 12 147 12.3 68% 19 245 5 Peak 7
Sep 14–21 20 13 149 11.5 70% 19 203 4 Moderate 7
Oct 11–17 16 16 179 11.2 76% 22 161 2 Quiet 6
Nov 8–13 10 14 157 11.2 80% 22 116 1 Quiet 5
Dec 5–10 7 17 214 12.6 84% 24 90 1 Quiet 3

UV Index in Mont Saint-Michel by Month

UV index in Mont Saint-Michel peaks at 6 (moderate) in June, dropping to 1 (low) in January.

Best months in detail

August

7/10

15–23°C · 12 rain days (147h) · 245 sun hours · 68% humidity · Peak crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 7 (high)

June

7/10

13–21°C · 13 rain days (148h) · 266 sun hours · 68% humidity · Moderate crowd · UV 6 (moderate) · sunniest 1 in 10 days reach 8 (high)

July

7/10

15–22°C · 13 rain days (157h) · 268 sun hours · 66% humidity · Busy crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 7 (high)

Every month

Show the other 9 months in detail

January

4/10

4–9°C (feels 5°C) · 16 rain days (181h) · 102 sun hours · 82% humidity · Quiet crowd · UV 1 (low)

February

4/10

5–11°C (feels 7°C) · 13 rain days (160h) · 110 sun hours · 77% humidity · Quiet crowd · UV 1 (low)

March

5/10

6–13°C (feels 9°C) · 16 rain days (179h) · 176 sun hours · 71% humidity · Quiet crowd · UV 2 (low) · sunniest 1 in 10 days reach 3 (moderate)

April

6/10

7–15°C (feels 12°C) · 11 rain days (125h) · 227 sun hours · 64% humidity · Quiet crowd · UV 4 (moderate)

May

6/10

10–18°C (feels 16°C) · 13 rain days (164h) · 258 sun hours · 65% humidity · Moderate crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 7 (high)

September

7/10

14–21°C · 13 rain days (149h) · 203 sun hours · 70% humidity · Moderate crowd · UV 4 (moderate)

October

6/10

11–17°C (feels 16°C) · 16 rain days (179h) · 161 sun hours · 76% humidity · Quiet crowd · UV 2 (low) · sunniest 1 in 10 days reach 3 (moderate)

November

5/10

8–13°C (feels 10°C) · 14 rain days (157h) · 116 sun hours · 80% humidity · Quiet crowd · UV 1 (low)

December

3/10

5–10°C (feels 7°C) · 17 rain days (214h) · 90 sun hours · 84% humidity · Quiet crowd · UV 1 (low)

Frequently asked questions about visiting Mont Saint-Michel

When is the best time to visit Mont Saint-Michel?

August is the highest-scoring month (7/10 on the Holiday Climate Index). Typical conditions: 15–23°C (12 rainy days). The top three months by score are August, June, July.

What is the worst time to visit Mont Saint-Michel?

December is the lowest-scoring month (3/10). Typical conditions: 5–10°C (17 rainy days).

When are crowds lowest in Mont Saint-Michel?

Search-interest seasonality (Google Trends 2021-2025) is lowest in January and peaks in August. 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 Mont Saint-Michel have good weather but fewer tourists?

September (climate 7/10, crowd index 40) and April (climate 6/10, crowd index 37) — shoulder months with above-average climate and below-median search-interest. Often the best value-for-weather trade.

What is the UV index in Mont Saint-Michel by month?

UV peaks at 6 (moderate) in June and is lowest in January at 1 (low). Monthly peak values: Jan 1, Feb 1, Mar 2, Apr 4, May 5, Jun 6, Jul 5, Aug 5, Sep 4, Oct 2, Nov 1, Dec 1.

What is the UV index in Mont Saint-Michel in June?

June is the peak UV month in Mont Saint-Michel, with a daily-peak UV index of 6 (moderate). Standard sun protection — sunglasses and light SPF — is recommended.

How high can UV get in Mont Saint-Michel 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. June is the worst case: typical days average UV 6 (moderate), but the top 10% of days reach UV 8 (high) — and even higher. Months where the sunniest days routinely exceed the typical reading: March, May, June, July, August, October. Plan sun protection for the worst case, not the average.

Is air quality in Mont Saint-Michel bad for travelers?

PM2.5 (fine-particle pollution) exceeds the WHO sensitive-group guideline (15 µg/m³) in 4 months: January, February, March, December. The worst month is December with a typical-day mean of 9 µg/m³ (fair); on the worst 10% of days PM2.5 reaches 17 µg/m³ (unhealthy for sensitive) and higher. People with asthma, heart conditions, or sensitive children may want to avoid these months or limit outdoor activity. Source: CAMS via Open-Meteo.