July
Other strong months: August and June
90/100 weather score
France · 1991–2020
Best time to visit
Saint-Nazaire
For Saint-Nazaire, July has the most comfortable weather in our climate comparison. Typical daytime highs are 25.1°C, nights average 14.3°C, and rainfall totals about 44 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthJuly
Typical daytime high25.1°C
Typical night-time low14.3°C
July rainfall44 mm
July
Other strong months: August and June
64/100 weather score
May
Other strong months: September and June
86/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
5 months fit your choices for Saint-Nazaire
December has the lowest comfort score at 14 out of 100, compared with July at 90. The main reason is that days reach only 9.9°C, 14° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Saint-Nazaire?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Saint-Nazaire?
July is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 25.1°C and 44 mm of rain.
What is the hottest month in Saint-Nazaire?
August is hottest in this record, with a typical daytime high of 25.4°C and a night-time low of 14.2°C.
Which month has the least rain?
July has the lowest monthly rainfall total at 44 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 9.4°C | 3.3°C | 88 mm | 12.5 | 9.5°C | 8 h 52 | 15 | Strong coverage |
| February | 10.5°C | 3°C | 67 mm | 10.6 | 9.2°C | 10 h 11 | 22 | Strong coverage |
| March | 13.5°C | 4.9°C | 58 mm | 9.4 | 9.9°C | 11 h 45 | 38 | Strong coverage |
| April | 16.2°C | 6.6°C | 58 mm | 9.7 | 11.8°C | 13 h 32 | 50 | Strong coverage |
| May | 19.6°C | 9.8°C | 61 mm | 9.6 | 14.2°C | 15 h 03 | 67 | Strong coverage |
| June | 23°C | 12.7°C | 48 mm | 7.6 | 16.6°C | 15 h 54 | 86 | Strong coverage |
| July | 25.1°C | 14.3°C | 44 mm | 7.1 | 18.0°C | 15 h 34 | 90 | Strong coverage |
| August | 25.4°C | 14.2°C | 50 mm | 7.2 | 18.5°C | 14 h 14 | 88 | Strong coverage |
| September | 22.4°C | 11.8°C | 60 mm | 7.8 | 17.4°C | 12 h 30 | 81 | Strong coverage |
| October | 17.6°C | 9.4°C | 89 mm | 11.8 | 15.8°C | 10 h 47 | 53 | Strong coverage |
| November | 12.9°C | 5.9°C | 94 mm | 13 | 13.5°C | 9 h 15 | 30 | Strong coverage |
| December | 9.9°C | 3.6°C | 101 mm | 13.5 | 11.0°C | 8 h 29 | 14 | Strong coverage |
What has changed
Recent daytime highs are
1.7°C warmer in Saint-Nazaire.
Each bar shows the difference between the 2011–2025 average daytime high and the 1961–1990 average for the same month at the same station. A blank month does not have enough older observations for a reliable comparison.
Jan
+1.0
Feb
+1.3
Mar
+1.8
Apr
+2.3
May
+2.0
Jun
+1.9
Jul
+1.5
Aug
+1.8
Sep
+1.4
Oct
+1.3
Nov
+1.6
Dec
+1.9
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.2°C27 Jan 2003 | -13.0°C16 Jan 1985 | 50 mm2 Jan 1961 | 216 mm1988 · driest 8 mm in 1992 | 81 |
| February | 22.6°C27 Feb 2019 | -15.6°C15 Feb 1956 | 35 mm4 Feb 1951 | 186 mm1957 · driest 1 mm in 1965 | 81 |
| March | 24.2°C30 Mar 2021 | -9.6°C1 Mar 2005 | 47 mm1 Mar 2020 | 140 mm2001 · driest 3 mm in 1997 | 81 |
| April | 28.3°C30 Apr 2005 | -2.8°C7 Apr 2008 | 44 mm30 Apr 2015 | 168 mm1998 · driest 3 mm in 1984 | 81 |
| May | 35.7°C25 May 2026 | -1.5°C1 May 1945 | 57 mm26 May 1950 | 207 mm1981 · driest 12 mm in 2011 | 82 |
| June | 41.7°C22 Jun 2026 | 3.8°C3 Jun 1975 | 70 mm11 Jun 2018 | 160 mm2018 · driest 0 mm in 1976 | 82 |
| July | 42.0°C18 Jul 2022 | 5.8°C10 Jul 1948 | 95 mm7 Jul 1977 | 167 mm1977 · driest 6 mm in 1967 | 81 |
| August | 39.6°C7 Aug 2020 | 5.6°C7 Aug 1956 | 53 mm28 Aug 1970 | 156 mm1956 · driest 0 mm in 1955 | 81 |
| September | 35.4°C9 Sep 2023 | 2.8°C19 Sep 1952 | 48 mm25 Sep 1975 | 200 mm1999 · driest 2 mm in 1997 | 81 |
| October | 30.4°C9 Oct 2023 | -3.3°C30 Oct 1997 | 97 mm2 Oct 2021 | 247 mm1966 · driest 6 mm in 1978 | 81 |
| November | 21.8°C1 Nov 2015 | -6.8°C21 Nov 1993 | 46 mm3 Nov 1957 | 198 mm1984 · driest 14 mm in 1956 | 81 |
| December | 18.4°C4 Dec 1953 | -10.8°C21 Dec 1946 | 39 mm3 Dec 1992 | 181 mm1989 · driest 8 mm in 1991 | 81 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 8 | 3 |
| February | 0 | 0 | 7 | 2 |
| March | 0 | 0 | 3 | 2 |
| April | <1 | 0 | <1 | 2 |
| May | 4 | <1 | 0 | 2 |
| June | 9 | 2 | 0 | 1 |
| July | 14 | 4 | 0 | 1 |
| August | 14 | 4 | 0 | 2 |
| September | 7 | 1 | 0 | 2 |
| October | <1 | 0 | <1 | 3 |
| November | 0 | 0 | 3 | 3 |
| December | 0 | 0 | 7 | 4 |
The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 96); on 2011–2025 it is June (93). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 0% | 41% | 9% | 53% | 6.3–11.1°C |
| February | <1% | 38% | 7% | 48% | 7.5–12.5°C |
| March | 3% | 33% | 6% | 44% | 10.6–15.3°C |
| April | 12% | 30% | 5% | 37% | 13.9–17.7°C |
| May | 31% | 32% | 5% | 39% | 17.0–21.5°C |
| June | 59% | 26% | 4% | 30% | 20.2–25.0°C |
| July | 74% | 22% | 4% | 24% | 22.2–27.3°C |
| August | 73% | 24% | 5% | 29% | 22.2–27.5°C |
| September | 55% | 29% | 7% | 38% | 19.9–24.3°C |
| October | 17% | 35% | 9% | 46% | 16.0–19.4°C |
| November | <1% | 40% | 10% | 51% | 10.8–14.3°C |
| December | 0% | 41% | 10% | 55% | 7.4–11.6°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 2977921
- NOAA station
- FRM00007222 · NANTES-BOUGUENAIS
- Station distance
- 48.1 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 47.28°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 18 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Saint-Nazaire is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
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