June
June · September · July
78climate match
United States · 1991–2020
Best time to visit
Lewiston.
June leads for comfortable weather in Lewiston: typically 26.4°C by day, 7.7°C at night, with 31 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortJune
Typical high26.4°C
Typical low7.7°C
Rain in June31 mm
July
July · August · June
63climate match
May
May · June · September
79climate match
The weakest month is January, scoring 5 against June’s 78 — days reach only 0.6°C, 23° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
50.6° / -10°
Feb
53.3° / -8.3°
Mar
1710.2° / -3.3°
Apr
3815.3° / 0.2°
May
6220.6° / 4.3°
Jun
7826.4° / 7.7°
Jul
6731.4° / 10.5°
Aug
6631.1° / 9.2°
Sep
7625.5° / 4.9°
Oct
4717.1° / -0.6°
Nov
108.5° / -5.3°
Dec
51° / -9.7°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 0.6°C | -10°C | 43 mm | 7.7 | 9 h 26 | 5 | Good coverage |
| February | 3.3°C | -8.3°C | 36 mm | 7 | 10 h 31 | 5 | Good coverage |
| March | 10.2°C | -3.3°C | 43 mm | 7.2 | 11 h 48 | 17 | Good coverage |
| April | 15.3°C | 0.2°C | 48 mm | 8.2 | 13 h 17 | 38 | Good coverage |
| May | 20.6°C | 4.3°C | 56 mm | 8.2 | 14 h 32 | 62 | Strong coverage |
| June | 26.4°C | 7.7°C | 31 mm | 4.5 | 15 h 13 | 78 | Good coverage |
| July | 31.4°C | 10.5°C | 16 mm | 3 | 14 h 57 | 67 | Good coverage |
| August | 31.1°C | 9.2°C | 19 mm | 3 | 13 h 52 | 66 | Good coverage |
| September | 25.5°C | 4.9°C | 31 mm | 4.3 | 12 h 26 | 76 | Good coverage |
| October | 17.1°C | -0.6°C | 37 mm | 5.3 | 11 h | 47 | Good coverage |
| November | 8.5°C | -5.3°C | 27 mm | 5.2 | 9 h 45 | 10 | Good coverage |
| December | 1°C | -9.7°C | 37 mm | 7.2 | 9 h 08 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 15.6°C31 Jan 2003 | -35.6°C7 Jan 2017 | 59 mm23 Jan 1997 | 134 mm1997 · driest 3 mm in 2025 | 46 |
| February | 17.8°C8 Feb 2015 | -37.8°C1 Feb 1985 | 43 mm17 Feb 1986 | 144 mm1986 · driest 1 mm in 1988 | 46 |
| March | 27.2°C21 Mar 2026 | -23.9°C6 Mar 1945 | 39 mm13 Mar 1946 | 127 mm1982 · driest 13 mm in 2010 | 46 |
| April | 29.4°C27 Apr 1987 | -12.2°C7 Apr 2023 | 52 mm21 Apr 1944 | 126 mm1986 · driest 8 mm in 1985 | 47 |
| May | 34.4°C29 May 2003 | -6.1°C2 May 2013 | 31 mm16 May 1980 | 146 mm2015 · driest 7 mm in 2024 | 47 |
| June | 37.8°C24 Jun 1988 | -2.2°C21 Jun 1989 | 45 mm3 Jun 2009 | 126 mm2009 · driest 0 mm in 2013 | 48 |
| July | 39.4°C31 Jul 2000 | 1.1°C13 Jul 1993 | 43 mm12 Jul 1997 | 68 mm1997 · driest 0 mm in 2025 | 47 |
| August | 38.9°C2 Aug 2000 | -3.3°C27 Aug 2019 | 61 mm18 Aug 1977 | 98 mm1977 · driest 0 mm in 1944 | 47 |
| September | 37.2°C7 Sep 2022 | -7.2°C29 Sep 1985 | 65 mm29 Sep 2019 | 126 mm2019 · driest 0 mm in 2011 | 46 |
| October | 30.6°C2 Oct 2010 | -16.1°C30 Oct 2019 | 39 mm17 Oct 2016 | 117 mm1981 · driest 0 mm in 1978 | 47 |
| November | 23.3°C1 Nov 2014 | -27.2°C29 Nov 1979 | 38 mm10 Nov 1945 | 120 mm1945 · driest 0 mm in 1976 | 47 |
| December | 16.7°C2 Dec 1995 | -33.9°C23 Dec 1983 | 42 mm31 Dec 1948 | 157 mm1996 · driest 1 mm in 1976 | 47 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 1 | 7 |
| February | 0 | 0 | 25 | <1 | 6 |
| March | 0 | 0 | 23 | 1 | 3 |
| April | 1 | 0 | 14 | 1 | 1 |
| May | 8 | <1 | 4 | 2 | <1 |
| June | 20 | 9 | <1 | <1 | 0 |
| July | 30 | 23 | 0 | <1 | 0 |
| August | 29 | 22 | <1 | <1 | 0 |
| September | 19 | 6 | 3 | <1 | 0 |
| October | 3 | <1 | 17 | 1 | <1 |
| November | 0 | 0 | 25 | <1 | 3 |
| December | 0 | 0 | 27 | <1 | 7 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 23% | 3% | 24% | -4.2–3.9°C |
| February | 0% | 24% | 3% | 29% | -0.9–6.6°C |
| March | 4% | 26% | 4% | 28% | 7.4–12.9°C |
| April | 23% | 24% | 4% | 25% | 12.7–19.0°C |
| May | 51% | 26% | 6% | 31% | 17.6–22.8°C |
| June | 81% | 15% | 3% | 13% | 23.7–29.1°C |
| July | 91% | 9% | 2% | 6% | 29.2–33.5°C |
| August | 89% | 11% | 2% | 7% | 28.4–32.6°C |
| September | 78% | 14% | 3% | 13% | 23.1–27.8°C |
| October | 36% | 17% | 4% | 15% | 14.8–20.5°C |
| November | 1% | 21% | 3% | 25% | 4.8–11.2°C |
| December | 0% | 23% | 3% | 24% | -1.2–4.9°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 5777244
- NOAA station
- USC00428828 · TRENTON
- Station distance
- 8.1 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 21 usable years
- Daylight
- Calculated from latitude 41.98°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.